A 1-2 letter code represents the fundamental deviation. Upper case (e.g., G, JS) designates hole deviations, while lower case (e.g., g, js) designates shaft deviations.Tolerance ClassThe tolerance class is designated by the letter(s) representing the fundamental deviation followed by the standard tolerance grade number. For example, a shaft with a deviation of g and a tolerance grade of T11 will be denoted as g11. A hole with a deviation of JS and a tolerance grade of IT7 will be represented as JS7.Tolerance SizeThe tolerance size combines the basic size with the tolerance class, designated by the basic size, followedby the designation of the required tolerance class (without spaces). For example, 32H7 specifies a hole with a nominal size of 32 mm, deviation H, and tolerance grade of IT7.Tolerances ChartsStandard Tolerance Grades (IT) ChartTolerance Dimensions in MicronsTo convert to millimeters, divide by 1000To convert to Thous, divide by 25.4 wdt_IDDiameter Range (mm)(Inches)IT01IT0IT1IT2IT3IT4IT5IT6IT7IT8IT9IT10IT11IT12IT13IT14IT15IT16IT17IT1810 - 30 - 0.120.30.50.81.2234610142540601001402504006001000140023 - 60.12 - 0.240.40.611.52.545812183048751201803004807501200180036 - 100.24 - 0.40.40.611.52.5469152236589015022036058090015002200410 - 180.4 - 0.710.50.81.223581118274370110180270430700110018002700518 - 300.71 - 1.190.611.52.54691321335284130210330520840130021003300630 - 501.19 - 1.970.611.52.54711162539621001602503906201000160025003900750 - 801.97 - 3.150.81.2235813193046741201903004607401200190030004600880 - 1203.15 - 4.7311.52.54610152235548714022035054087014002200350054009120 - 1804.73 - 7.091.223.55812182540631001602504006301000160025004000630010180 - 2507.09 - 9.85234.571014202946721151852904607201150185029004600720011250 - 3159.85 - 12.412.54681216233252811302103205208101300210032005200810012315 - 40012.41 - 15.7535791318253657891402303605708901400230036005700890013400 - 50015.75 - 19.7468101520274063971552504006309701550250040006300970014500 - 63019.7 - 24.84.569111622324470110175280440700110017502800440070001100015630 - 80024.8 - 31.55710131825365080125200320500800125020003200500080001250016800 - 100031.5 - 39.45.58111521284056901402303605609001400230036005600900014000171000 - 125039.4 - 49.26.59131824334766105165260420660105016502600420066001050016500181250 - 160049.2 - 63811152129395578125195310500780125019503100500078001250019500191600 - 200063 - 78.7913182535466592150230370600920150023003700600092001500023000202000 - 250078.7 - 98.4111522304155781101752804407001100175028004400700011001750028000212500 - 315098.4 - 1241318263650689613521033054086013502100330054008600135002100033000Fundamental deviation of holes ChartClick the Tolerance Link (e.g., H ➢) to get the Full & Accurate charts for a specific deviation in Inch and Metric unitsClick  icons to show all columns for the entire diameter range (0-3,150 mm)The deviations of J through Z also depend on the IT Therefore, the values in the below table are only accurate in some cases. To get the correct value in all cases, click the Tolerance Link (e.g., H ➢).Dimentions in Microns. To convert to millimeters, divide by 1000, to Thous, divide by 25.4 Deviationidurl0 - 3 mm3 - 6 mm6 - 1010 - 1414 - 1818 - 2424 - 3030 - 4040 - 5050 - 6565 - 8080 - 100100 - 120120 - 140140 - 160160 - 180180 - 200200 - 225225 - 250250 - 280280 - 315315 - 355355 - 400400 - 450450 - 500500 - 560560 - 630630 - 710710 - 800800 - 900900 - 10001000 - 11201120 - 12501250 - 14001400 - 16001600 - 18001800 - 20002000 - 22402240 - 25002500 - 28002800 - 3150A ➢1calculators/tolerances/tol?dev=a||A ➢27027028029029030030031032034036038041046052058066074082092010501200135015001650XXXXXXXXXXXXXXXXB ➢2calculators/tolerances/tol?dev=b||B ➢140140150150150160160170180190200220240260280310340380420480540600680760840XXXXXXXXXXXXXXXXC ➢3calculators/tolerances/tol?dev=c||C ➢6070809595110110120130140150170180200210230240260280300330360400440480520580640700780860940105011501300145016001800200022002500CD ➢4calculators/tolerances/tol?dev=cd||CD ➢344656XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXD ➢5calculators/tolerances/tol?dev=d||D ➢203040505065658080100100120120145145145170170170190190210210230230260260290290320320350350390390430430480480520520E ➢6calculators/tolerances/tol?dev=e||E ➢14202532324040505060607272858585100100100110110125125135135145145160160170170195195220220240240260260290290EF ➢7calculators/tolerances/tol?dev=ef||EF ➢101418XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXF ➢8calculators/tolerances/tol?dev=f||F ➢61013161620202525303036364343435050505656626268687676808086869898110110120120130130145145FG ➢9calculators/tolerances/tol?dev=fg||FG ➢468XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXG ➢10calculators/tolerances/tol?dev=g||G ➢2456677991010121214141415151517171818202022222424262628283030323234343838H ➢11calculators/tolerances/tol?dev=h||H ➢00000000000000000000000000000000000000000JS ➢12calculators/tolerances/tol?dev=js||JS ➢00000000000000000000000000000000000000000J ➢13calculators/tolerances/tol?dev=j||J ➢46810101212141418182222262626303030363639394343XXXXXXXXXXXXXXXXK ➢14calculators/tolerances/tol?dev=k||K ➢0-1-1-1-1-2-2-2-2-2-2-3-3-3-3-3-4-4-4-4-4-4-4-5-50000000000000000M ➢15calculators/tolerances/tol?dev=m||M ➢-2-4-6-7-7-8-8-9-9-11-11-13-13-15-15-15-17-17-17-20-20-21-21-23-23-26-26-30-30-34-34-40-40-48-48-58-58-68-68-76-76N ➢16calculators/tolerances/tol?dev=n||N ➢-4-8-10-12-12-15-15-17-17-20-20-23-23-27-27-27-31-31-31-34-34-37-37-40-40-44-44-50-50-56-56-66-66-78-78-92-92-110-110-135-135P ➢17calculators/tolerances/tol?dev=p||P ➢-6-12-15-18-18-22-22-26-26-32-32-37-37-43-43-43-50-50-50-56-56-62-62-68-68-78-78-88-88-100-100-120-120-140-140-170-170-195-195-240-240R ➢18calculators/tolerances/tol?dev=r||R ➢-10-15-19-23-23-28-28-34-34-41-43-51-54-63-65-68-77-80-84-94-98-108-114-126-132-150-155-175-185-210-220-250-260-300-330-370-400-440-460-550-580S ➢19calculators/tolerances/tol?dev=s||S ➢-14-19-23-28-28-35-35-43-43-53-59-71-79-92-100-108-122-130-140-158-170-190-208-232-252-280-310-340-380-430-470-520-580-640-720-820-920-1000-1100-1250-1400T ➢20calculators/tolerances/tol?dev=t||T ➢000XXX-41-48-54-66-75-91-104-122-134-146-166-180-196-218-240-268-294-330-360-400-450-500-560-620-680-780-840-960-1050-1200-1350-1500-1650-1900-2100U ➢21calculators/tolerances/tol?dev=u||U ➢-18-23-28-33-33-41-48-60-70-87-102-124-144-170-190-210-236-258-284-315-350-390-435-490-540-600-660-740-840-940-1050-1150-1300-1450-1600-1850-2000-2300-2500-2900-3200V ➢22calculators/tolerances/tol?dev=v||V ➢000X-39-47-55-68-81-102-120-146-172-202-228-252-284-310-340-385-425-475-530-595-660-740-820-920-1000-1150-1300-1450-1600-1800-2000-2300-2500-2800-3100-3500-3900X ➢23calculators/tolerances/tol?dev=x||X ➢-20-28-34-40-45-54-64-80-97-122-146-178-210-248-280-310-340-385-425-475-525-590-660-740-820XXXXXXXXXXXXXXXXY ➢24calculators/tolerances/tol?dev=y||Y ➢000XX-63-75-94-114-144-174-214-254-300-340-380-425-470-520-580-650-730-820-920-1000XXXXXXXXXXXXXXXXZ ➢25calculators/tolerances/tol?dev=z||Z ➢-26-35-42-50-60-73-88-112-136-172-210-258-310-365-415-465-520-575-640-710-790-900-1000-1100-1250XXXXXXXXXXXXXXXXZA ➢26calculators/tolerances/tol?dev=za||ZA ➢-32-42-52-64-77-98-118-148-180-226-274-335-400-470-535-600-670-740-820-920-1000-1150-1300-1450-1600XXXXXXXXXXXXXXXXFundamental deviation of shafts ChartClick the Tolerance Link (e.g., g ➢) to get the Full & Accurate charts for a specific deviation in Inch and Metric unitsClick  icons to show all columns of the entire diameter range (0-3,150 mm)The deviations of J through Z also depend on the IT Therefore, the values in the below table are only accurate in some cases. To get the correct value in all cases, click the Tolerance Link (e.g., g ➢).Dimentions in Microns. To convert to millimeters, divide by 1000, to Thous, divide by 25.4 Deviationidurl0 - 3 mm3 - 6 mm6 - 1010 - 1414 - 1818 - 2424 - 3030 - 4040 - 5050 - 6565 - 8080 - 100100 - 120120 - 140140 - 160160 - 180180 - 200200 - 225225 - 250250 - 280280 - 315315 - 355355 - 400400 - 450450 - 500500 - 560560 - 630630 - 710710 - 800800 - 900900 - 10001000 - 11201120 - 12501250 - 14001400 - 16001600 - 18001800 - 20002000 - 22402240 - 25002500 - 28002800 - 3150a ➢1calculators/tolerances/tol?dev=a||A ➢-270-270-280-290-290-300-300-310-320-340-360-380-410-460-520-580-660-740-820-920-1050-1200-1350-1500-1650XXXXXXXXXXXXXXXXb ➢2calculators/tolerances/tol?dev=b||B ➢-140-140-150-150-150-160-160-170-180-190-200-220-240-260-280-310-340-380-420-480-540-600-680-760-840XXXXXXXXXXXXXXXXc ➢3calculators/tolerances/tol?dev=c||C ➢-60-70-80-95-95-110-110-120-130-140-150-170-180-200-210-230-240-260-280-300-330-360-400-440-480-520-580-640-700-780-860-940-1050-1150-1300-1450-1600-1800-2000-2200-2500cd ➢4calculators/tolerances/tol?dev=cd||CD ➢-34-46-56XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXd ➢5calculators/tolerances/tol?dev=d||D ➢-20-30-40-50-50-65-65-80-80-100-100-120-120-145-145-145-170-170-170-190-190-210-210-230-230-260-260-290-290-320-320-350-350-390-390-430-430-480-480-520-520e ➢6calculators/tolerances/tol?dev=e||E ➢-14-20-25-32-32-40-40-50-50-60-60-72-72-85-85-85-100-100-100-110-110-125-125-135-135-145-145-160-160-170-170-195-195-220-220-240-240-260-260-290-290ef ➢7calculators/tolerances/tol?dev=ef||EF ➢-10-14-18XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXf ➢8calculators/tolerances/tol?dev=f||F ➢-6-10-13-16-16-20-20-25-25-30-30-36-36-43-43-43-50-50-50-56-56-62-62-68-68-76-76-80-80-86-86-98-98-110-110-120-120-130-130-145-145fg ➢9calculators/tolerances/tol?dev=fg||FG ➢-4-6-8XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXg ➢10calculators/tolerances/tol?dev=g||G ➢-2-4-5-6-6-7-7-9-9-10-10-12-12-14-14-14-15-15-15-17-17-18-18-20-20-22-22-24-24-26-26-28-28-30-30-32-32-34-34-38-38h ➢11calculators/tolerances/tol?dev=h||H ➢00000000000000000000000000000000000000000js ➢12calculators/tolerances/tol?dev=js||JS ➢00000000000000000000000000000000000000000j ➢13calculators/tolerances/tol?dev=j||J ➢-4-6-8-10-10-12-12-14-14-18-18-22-22-26-26-26-30-30-30-36-36-39-39-43-43XXXXXXXXXXXXXXXXk ➢14calculators/tolerances/tol?dev=k||K ➢01111222222333334444444550000000000000000m ➢15calculators/tolerances/tol?dev=m||M ➢2467788991111131315151517171720202121232326263030343440404848585868687676n ➢16calculators/tolerances/tol?dev=n||N ➢481012121515171720202323272727313131343437374040444450505656666678789292110110135135p ➢17calculators/tolerances/tol?dev=p||P ➢612151818222226263232373743434350505056566262686878788888100100120120140140170170195195240240r ➢18calculators/tolerances/tol?dev=r||R ➢101519232328283434414351546365687780849498108114126132150155175185210220250260300330370400440460550580s ➢19calculators/tolerances/tol?dev=s||S ➢14192328283535434353597179921001081221301401581701902082322522803103403804304705205806407208209201000110012501400t ➢20calculators/tolerances/tol?dev=t||T ➢000XXX4148546675911041221341461661801962182402682943303604004505005606206807808409601050120013501500165019002100u ➢21calculators/tolerances/tol?dev=u||U ➢1823283333414860708710212414417019021023625828431535039043549054060066074084094010501150130014501600185020002300250029003200v ➢22calculators/tolerances/tol?dev=v||V ➢000X39475568811021201461722022282522843103403854254755305956607408209201000115013001450160018002000230025002800310035003900x ➢23calculators/tolerances/tol?dev=x||X ➢202834404554648097122146178210248280310340385425475525590660740820XXXXXXXXXXXXXXXXy ➢24calculators/tolerances/tol?dev=y||Y ➢000XX6375941141441742142543003403804254705205806507308209201000XXXXXXXXXXXXXXXXz ➢25calculators/tolerances/tol?dev=z||Z ➢26354250607388112136172210258310365415465520575640710790900100011001250XXXXXXXXXXXXXXXXza ➢26calculators/tolerances/tol?dev=za||ZA ➢32425264779811814818022627433540047053560067074082092010001150130014501600XXXXXXXXXXXXXXXXEngineering FitsEngineering fit refers to the degree of tightness or looseness between two mating parts in an assembly. It is defined by combining a hole with a tolerance class and a shaft with a tolerance class. (See definition of terms above).Several standards define recommended pairings for different applications. The values presented in our charts and Calculator are based on ISO 286-1:2010 (In earlier revisions, it was separated into ISO 1829, which is now obsolete). In North America, additional fit combinations are sometimes used per ANSI B4.1 & B4.2. The ANSI tolerancing system is nearly equivalent to ISO 286 but not identical. The difference is typically 0.1-0.5 thous.Main Fit TypesClearance FitA clearance fit is a type in which the shaft is smaller than the hole it is inserted into, allowing for free movement, assembly, and disassembly. Clearance fits can range from loose-running for assemblies that need a significant gap for free movement or to accommodate temperature variation to locational clearance for stationary parts that need to be freely assembled/disassembled but still maintain accuracy.Transition FitA transition fit is a type in which the shaft may be slightly smaller or larger than the hole (before assembly). It is used to create a tight and secure connection between them in applications requiring high precision and stability. It provides high accuracy, but the connecting parts can be disassembled and reassembled without damage. However, force cannot be transmitted.Press Fit (Interference)An interference (Press) fit is a type in which the shaft is larger than the hole (before assembly). It creates a frictional force that holds the parts together without the need for additional fasteners or adhesives. The interference fit is commonly used in mechanical engineering to create solid and reliable connections between components that need to withstand heavy loads or vibrations. However, It is hard to disassemble without damaging the parts. Some degree of force can be transmitted between the components.Fits are also divided into two types of “basis”There are no technical differences between the two basis. Therefore the choice of the system should be based on economic reasons.Hole Basis FitsThe hole deviation is zero (meaning an H), and the shaft deviation varies to create different fit levels. For example, H9/d8 , H7/g6. It is the first choice of combinations for general use, since it avoids an unnecessary multiplicity of tools (e.g., reamers) and gaugesShaft Basis FitsThe shaft deviation is zero (meaning an h), and the hole deviation varies to create different fit levels. For example, D9/h9, G7/h6. This method should only be utilized when it offers clear economic benefits, such as in situations where it is required to assemble multiple parts with holes that have varying deviations onto a single shaft.Fits Standard Combinations ChartsFor ordinary engineering purposes, only a small number of the many (~150,000) possible fit combinations is required. ISO 286-1:2010 lists about 80 fit combinations that meet most of the needs of any engineering task. You can choose from this list or define a custom combination in our Fit Calculator.(*) In North America, additional fit combinations are sometimes used per ANSI B4.1 & B4.2. You can find below the ISO charts also the ANSI Charts.Click the Fit Link (e.g. G7/h6 ➢) to get its detailed tolerances in both Inch and millimetersHole Basis Fits (ISO 286-1)fit_typeFitFit LevelPreferedc_idfit_sortFit typeLeveliH10/b9 ➢DGNC1Clearance Fit6.00iH11/b11 ➢DGYC1Clearance Fit6.00iH10/c9 ➢DGNC1Clearance Fit5.00iH11/c11 ➢DGYC1Clearance Fit5.00iH8/d8 ➢GRNC1Clearance Fit4.00iH9/d8 ➢GRNC1Clearance Fit4.00iH10/d9 ➢GRYC1Clearance Fit4.00iH11/d10 ➢GRNC1Clearance Fit4.00iH10/e9 ➢GRNC1Clearance Fit3.00iH9/e8 ➢GRYC1Clearance Fit3.00iH8/e8 ➢GRYC1Clearance Fit3.00iH8/e7 ➢GRNC1Clearance Fit3.00iH7/f6 ➢LGNC1Clearance Fit2.00iH9/f8 ➢LGNC1Clearance Fit2.00iH8/f8 ➢LGNC1Clearance Fit2.00iH8/f7 ➢LGYC1Clearance Fit2.00iH7/g6 ➢LGYC1Clearance Fit1.00iH6/g5 ➢LGNC1Clearance Fit1.00iH10/h9 ➢LGYC1Clearance Fit0.00iH11/h10 ➢LGNC1Clearance Fit0.00iH9/h8 ➢LGNC1Clearance Fit0.00iH8/h8 ➢LGNC1Clearance Fit0.00iH6/h5 ➢LGNC1Clearance Fit0.00iH7/h6 ➢LGYC1Clearance Fit0.00iH8/h7 ➢LGYC1Clearance Fit-1.00iH6/js5 ➢orNT2Transition Fit-1.00iH7/js6 ➢orYT2Transition Fit-1.00iH8/k7 ➢orNT2Transition Fit-3.00iH6/k5 ➢orNT2Transition Fit-3.00iH7/k6 ➢orYT2Transition Fit-3.00iH7/m6 ➢orNT2Transition Fit-5.00iH6/m5 ➢orNT2Transition Fit-5.00iH8/m7 ➢orNT2Transition Fit-5.00iH7/n6 ➢orYT2Transition Fit-6.00iH8/js7 ➢orNT2Transition Fit-11.00iH6/n5 ➢LRNI3Press Fit (Interference)-6.00iH7/p6 ➢LRYI3Press Fit (Interference)-8.00iH6/p5 ➢LRNI3Press Fit (Interference)-8.00iH7/r6 ➢LRYI3Press Fit (Interference)-10.00iH7/s6 ➢RDYI3Press Fit (Interference)-11.00iH8/s7 ➢RDNI3Press Fit (Interference)-11.00iH7/t6 ➢RDNI3Press Fit (Interference)-12.00iH7/u6 ➢DRNI3Press Fit (Interference)-13.00iH8/u7 ➢DRNI3Press Fit (Interference)-13.00iH7/x6 ➢DRNI3Press Fit (Interference)-16.00Shaft Basis Fits (ISO 286-1)fit_typeFitFit LevelPreferedc_idfit_sortFit typeLeveliH10/b9 ➢DGNC1Clearance Fit6.00iH11/b11 ➢DGYC1Clearance Fit6.00iH10/c9 ➢DGNC1Clearance Fit5.00iH11/c11 ➢DGYC1Clearance Fit5.00iH8/d8 ➢GRNC1Clearance Fit4.00iH9/d8 ➢GRNC1Clearance Fit4.00iH10/d9 ➢GRYC1Clearance Fit4.00iH11/d10 ➢GRNC1Clearance Fit4.00iH10/e9 ➢GRNC1Clearance Fit3.00iH9/e8 ➢GRYC1Clearance Fit3.00iH8/e8 ➢GRYC1Clearance Fit3.00iH8/e7 ➢GRNC1Clearance Fit3.00iH7/f6 ➢LGNC1Clearance Fit2.00iH9/f8 ➢LGNC1Clearance Fit2.00iH8/f8 ➢LGNC1Clearance Fit2.00iH8/f7 ➢LGYC1Clearance Fit2.00iH7/g6 ➢LGYC1Clearance Fit1.00iH6/g5 ➢LGNC1Clearance Fit1.00iH10/h9 ➢LGYC1Clearance Fit0.00iH11/h10 ➢LGNC1Clearance Fit0.00iH9/h8 ➢LGNC1Clearance Fit0.00iH8/h8 ➢LGNC1Clearance Fit0.00iH6/h5 ➢LGNC1Clearance Fit0.00iH7/h6 ➢LGYC1Clearance Fit0.00iH8/h7 ➢LGYC1Clearance Fit-1.00iH6/js5 ➢orNT2Transition Fit-1.00iH7/js6 ➢orYT2Transition Fit-1.00iH8/k7 ➢orNT2Transition Fit-3.00iH6/k5 ➢orNT2Transition Fit-3.00iH7/k6 ➢orYT2Transition Fit-3.00iH7/m6 ➢orNT2Transition Fit-5.00iH6/m5 ➢orNT2Transition Fit-5.00iH8/m7 ➢orNT2Transition Fit-5.00iH7/n6 ➢orYT2Transition Fit-6.00iH8/js7 ➢orNT2Transition Fit-11.00iH6/n5 ➢LRNI3Press Fit (Interference)-6.00iH7/p6 ➢LRYI3Press Fit (Interference)-8.00iH6/p5 ➢LRNI3Press Fit (Interference)-8.00iH7/r6 ➢LRYI3Press Fit (Interference)-10.00iH7/s6 ➢RDYI3Press Fit (Interference)-11.00iH8/s7 ➢RDNI3Press Fit (Interference)-11.00iH7/t6 ➢RDNI3Press Fit (Interference)-12.00iH7/u6 ➢DRNI3Press Fit (Interference)-13.00iH8/u7 ➢DRNI3Press Fit (Interference)-13.00iH7/x6 ➢DRNI3Press Fit (Interference)-16.00Fit Combinations Per ANSI B4.1The tolerance classes mentioned in ANSI B4.1 (e.g., h9, g6, etc.) have the same nomenclature as in ISO 286. It could lead a confusion since the ANSI standard also defines the fundamental deviations and the tolerance grade on its own. The ANSI tolerancing system is nearly the same as the ISO 286 but not identical. If you take the values from the standard ISO charts or use our Online Calculator, you should expect about 0.1-0.5 thous errors. wdt_IDFit NameTolerance Class CombinationFit Typeth1RC 1H5/g4Running or Slidining Fits52RC 2H6/g5Running or Slidining Fits63RC 3H7/f6Running or Slidining Fits74RC 4H8/f7Running or Slidining Fits85RC 5H8/e7Running or Slidining Fits86RC 6H9/e8Running or Slidining Fits97RC 7H9/d8Running or Slidining Fits98RC 8H10/c9Running or Slidining Fits109RC 9H11/sh1Running or Slidining Fits1110LC 1H6/h5Clearance Location Fits611LC 2H7/h6Clearance Location Fits712LC 3H8/h7Clearance Location Fits813LC 4H10/h9Clearance Location Fits1014LC 5H7/g6Clearance Location Fits715LC 6H9/f8Clearance Location Fits916LC 7H10/e9Clearance Location Fits1017LC 8H10/d9Clearance Location Fits1018LC 9H11/c10Clearance Location Fits1119LC 10H12/sh2Clearance Location Fits1220LC 11H13/sh3Clearance Location Fits1321LT 1H7/js6Transition Fits722LT 2H8/js7Transition Fits823LT 3H7/k6Transition Fits724LT 4H8/k7Transition Fits825LT 5H7/n6Transition Fits726LT 6H7/n7Transition Fits727LN 1H6/n5Interference Location Fits628LN 2H7/p6Interference Location Fits729LN 3H7/r6Interference Location Fits730FN 1H6/sh4Force or Shrink Fits631FN 2H7/s6Force or Shrink Fits732FN 3H7/t6Force or Shrink Fits733FN 4H7/u6Force or Shrink Fits734FN 5H8/x7Force or Shrink Fits8Fit Combinations Per ANSI B4.2The tolerance classes mentioned in ANSI B4.1 (e.g., h9, g6, etc.) have the same nomenclature as in ISO 286. It could lead a confusion since the ANSI standard also defines the fundamental deviations and the tolerance grade on its own. The ANSI tolerancing system is nearly the same as the ISO 286 but not identical. If you take the values from the standard ISO charts or use our Online Calculator, you should expect about 0.1-0.5 thous errors.ClassificationHole BasisShaft BasisDescriptionClearanceH11/c11C11/h11Loose running fit for wide commercial tolerances or allowances on external members.H9/d9D9/h9Free running fit not for use where accuracy is essential, but good for large temperature variations, high running speeds, or heavy journal pressures.H8/f7F8/h7Close running fit for running on accurate machines and for accurate location at moderate speeds and journal pressures.H7/g6G7/h6Sliding fit not intended to run freely, but to move and turn freely and locate accurately.H7/h6H7/h6Locational clearance fit provides snug fit for locating stationary parts; but can be freely assembled and disassembled.InterferenceH7/k6K7/h6Locational transition fit for accurate location, a compromise between clearance and interference.H7/n6N7/h6Locational transition fit for more accurate location where greater interference is permissible.TransitionH7/p6P7/h6Locational interference fit for parts requiring rigidity and alignment with prime accuracy of location but without special bore pressure requirements.H7/s6S7/h6Medium drive fit for ordinary steel parts or shrink fits on light sections, the tightest fit usable with cast iron.H7/u6U7/h6Force fit suitable for parts which can be highly stressed or for shrink fits where the heavy pressing forces required are impractical.Related Glossary Terms:Thou

Pay attention that some of the terms have a somewhat different meaning within the tolerancing system (Compared to its general meaning in mechanical engineering!)TerminologyBasic Size (Also may be called nominal size)Nominal size is the dimension by which a feature is identified for convenience. It is also the point from which the limits are derived by application of the necessary deviation and tolerance (See explanation below). For example, a slot whose actual width is 25.15 mm would be known as a 25-mm wide slot.Limits of SizeLimits are the basic size’s high (Upper limit) and low (Lower limit) values. For example, if the lower limit of a hole is 25.05 mm and the upper limit of the same hole is 25.15 mm, then a hole that is 25.1 mm in diameter is within limits and is acceptable. The limits are the final result obtained from the tolerance system based on the nominal size and tolerance class.ShaftShaft refers to an external feature of a workpiece, typically cylindrical in shape. However, the term can be used to describe any external feature. For example, a block that has to fit into a keyway or the square shank of a cutting tool can also be referred to as a shaft.HoleHole refers to an internal feature of a workpiece, typically a bore. However, the term can be used to describe any internal feature. For example, a keyway.Fundamental DeviationFundamental Deviation is The position of the tolerance zone in relation to the zero line (Also referred to as basic size or nominal size). The fundamental deviation is measured to the point that is nearest to the zero line. A 1-2 character letter code (e.g. G, js, are used to indicate it. Holes are marked by capital letters, and shafts by small letters. For example, “G” is a fundamental deviation of a hole, and “js” is a fundamental deviation of a shaft.The size of the deviation depends on its letter code and the nominal size.Values are listed in the below table.Check out our below infographic for easier understanding.Upper & lower DeviationsThe algebraic difference between the upper limit and the basic size is called the upper deviation and is denoted by es for shafts and ES for holes. The algebraic difference between the lower limit and the basic size is called the lower deviation and is represented by ei for shafts and EI for holes. The configurations may be confusing and depend if the feature is external or internal and if the deviation is negative, positive, or zero.Deviation SymbolA-GHes=0,ei=ITEI=0, ES=ITJSei=es=IT/2EI=ES=IT/2K-ZToleranceTolerance is the difference between the limits of size. That is the upper limit minus the lower limit.Standard Tolerance Grade: A number between 0 to 18 and designated as “IT” (e.g. IT7). A lower IT means higher accuracy. The value of each IT also depends on the basic size. You can find the values in the below chart.The IS0 system provides 20 standard tolerance grades, of which IT1 to IT18 are considered general use. In addition, there are two complementary grades, IT01 and IT0. The collection of charts provided in ISO 286-2 covers only IT1-IT18.Tolerance Class: The term used for the combination of a fundamental deviation with a standard tolerance grade, e.g. h9, D13, etc.All the above terms are summarized in the below infographics(*) Click to enlargeNomenclatureStandard Tolerance GradesThe standard tolerance grades are designated by the letters IT followed by a number, for example, IT7. When the tolerance grade is associated with a fundamental deviation symbol to form a tolerance class, the letters IT are omitted (e.g., h7, JS5)Fundamental DeviationA 1-2 letter code represents the fundamental deviation. Upper case (e.g., G, JS) designates hole deviations, while lower case (e.g., g, js) designates shaft deviations.Tolerance ClassThe tolerance class is designated by the letter(s) representing the fundamental deviation followed by the standard tolerance grade number. For example, a shaft with a deviation of g and a tolerance grade of T11 will be denoted as g11. A hole with a deviation of JS and a tolerance grade of IT7 will be represented as JS7.Tolerance SizeThe tolerance size combines the basic size with the tolerance class, designated by the basic size, followedby the designation of the required tolerance class (without spaces). For example, 32H7 specifies a hole with a nominal size of 32 mm, deviation H, and tolerance grade of IT7.Tolerances ChartsStandard Tolerance Grades (IT) ChartTolerance Dimensions in MicronsTo convert to millimeters, divide by 1000To convert to Thous, divide by 25.4 wdt_IDDiameter Range (mm)(Inches)IT01IT0IT1IT2IT3IT4IT5IT6IT7IT8IT9IT10IT11IT12IT13IT14IT15IT16IT17IT1810 - 30 - 0.120.30.50.81.2234610142540601001402504006001000140023 - 60.12 - 0.240.40.611.52.545812183048751201803004807501200180036 - 100.24 - 0.40.40.611.52.5469152236589015022036058090015002200410 - 180.4 - 0.710.50.81.223581118274370110180270430700110018002700518 - 300.71 - 1.190.611.52.54691321335284130210330520840130021003300630 - 501.19 - 1.970.611.52.54711162539621001602503906201000160025003900750 - 801.97 - 3.150.81.2235813193046741201903004607401200190030004600880 - 1203.15 - 4.7311.52.54610152235548714022035054087014002200350054009120 - 1804.73 - 7.091.223.55812182540631001602504006301000160025004000630010180 - 2507.09 - 9.85234.571014202946721151852904607201150185029004600720011250 - 3159.85 - 12.412.54681216233252811302103205208101300210032005200810012315 - 40012.41 - 15.7535791318253657891402303605708901400230036005700890013400 - 50015.75 - 19.7468101520274063971552504006309701550250040006300970014500 - 63019.7 - 24.84.569111622324470110175280440700110017502800440070001100015630 - 80024.8 - 31.55710131825365080125200320500800125020003200500080001250016800 - 100031.5 - 39.45.58111521284056901402303605609001400230036005600900014000171000 - 125039.4 - 49.26.59131824334766105165260420660105016502600420066001050016500181250 - 160049.2 - 63811152129395578125195310500780125019503100500078001250019500191600 - 200063 - 78.7913182535466592150230370600920150023003700600092001500023000202000 - 250078.7 - 98.4111522304155781101752804407001100175028004400700011001750028000212500 - 315098.4 - 1241318263650689613521033054086013502100330054008600135002100033000Fundamental deviation of holes ChartClick the Tolerance Link (e.g., H ➢) to get the Full & Accurate charts for a specific deviation in Inch and Metric unitsClick  icons to show all columns for the entire diameter range (0-3,150 mm)The deviations of J through Z also depend on the IT Therefore, the values in the below table are only accurate in some cases. To get the correct value in all cases, click the Tolerance Link (e.g., H ➢).Dimentions in Microns. To convert to millimeters, divide by 1000, to Thous, divide by 25.4 Deviationidurl0 - 3 mm3 - 6 mm6 - 1010 - 1414 - 1818 - 2424 - 3030 - 4040 - 5050 - 6565 - 8080 - 100100 - 120120 - 140140 - 160160 - 180180 - 200200 - 225225 - 250250 - 280280 - 315315 - 355355 - 400400 - 450450 - 500500 - 560560 - 630630 - 710710 - 800800 - 900900 - 10001000 - 11201120 - 12501250 - 14001400 - 16001600 - 18001800 - 20002000 - 22402240 - 25002500 - 28002800 - 3150A ➢1calculators/tolerances/tol?dev=a||A ➢27027028029029030030031032034036038041046052058066074082092010501200135015001650XXXXXXXXXXXXXXXXB ➢2calculators/tolerances/tol?dev=b||B ➢140140150150150160160170180190200220240260280310340380420480540600680760840XXXXXXXXXXXXXXXXC ➢3calculators/tolerances/tol?dev=c||C ➢6070809595110110120130140150170180200210230240260280300330360400440480520580640700780860940105011501300145016001800200022002500CD ➢4calculators/tolerances/tol?dev=cd||CD ➢344656XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXD ➢5calculators/tolerances/tol?dev=d||D ➢203040505065658080100100120120145145145170170170190190210210230230260260290290320320350350390390430430480480520520E ➢6calculators/tolerances/tol?dev=e||E ➢14202532324040505060607272858585100100100110110125125135135145145160160170170195195220220240240260260290290EF ➢7calculators/tolerances/tol?dev=ef||EF ➢101418XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXF ➢8calculators/tolerances/tol?dev=f||F ➢61013161620202525303036364343435050505656626268687676808086869898110110120120130130145145FG ➢9calculators/tolerances/tol?dev=fg||FG ➢468XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXG ➢10calculators/tolerances/tol?dev=g||G ➢2456677991010121214141415151517171818202022222424262628283030323234343838H ➢11calculators/tolerances/tol?dev=h||H ➢00000000000000000000000000000000000000000JS ➢12calculators/tolerances/tol?dev=js||JS ➢00000000000000000000000000000000000000000J ➢13calculators/tolerances/tol?dev=j||J ➢46810101212141418182222262626303030363639394343XXXXXXXXXXXXXXXXK ➢14calculators/tolerances/tol?dev=k||K ➢0-1-1-1-1-2-2-2-2-2-2-3-3-3-3-3-4-4-4-4-4-4-4-5-50000000000000000M ➢15calculators/tolerances/tol?dev=m||M ➢-2-4-6-7-7-8-8-9-9-11-11-13-13-15-15-15-17-17-17-20-20-21-21-23-23-26-26-30-30-34-34-40-40-48-48-58-58-68-68-76-76N ➢16calculators/tolerances/tol?dev=n||N ➢-4-8-10-12-12-15-15-17-17-20-20-23-23-27-27-27-31-31-31-34-34-37-37-40-40-44-44-50-50-56-56-66-66-78-78-92-92-110-110-135-135P ➢17calculators/tolerances/tol?dev=p||P ➢-6-12-15-18-18-22-22-26-26-32-32-37-37-43-43-43-50-50-50-56-56-62-62-68-68-78-78-88-88-100-100-120-120-140-140-170-170-195-195-240-240R ➢18calculators/tolerances/tol?dev=r||R ➢-10-15-19-23-23-28-28-34-34-41-43-51-54-63-65-68-77-80-84-94-98-108-114-126-132-150-155-175-185-210-220-250-260-300-330-370-400-440-460-550-580S ➢19calculators/tolerances/tol?dev=s||S ➢-14-19-23-28-28-35-35-43-43-53-59-71-79-92-100-108-122-130-140-158-170-190-208-232-252-280-310-340-380-430-470-520-580-640-720-820-920-1000-1100-1250-1400T ➢20calculators/tolerances/tol?dev=t||T ➢000XXX-41-48-54-66-75-91-104-122-134-146-166-180-196-218-240-268-294-330-360-400-450-500-560-620-680-780-840-960-1050-1200-1350-1500-1650-1900-2100U ➢21calculators/tolerances/tol?dev=u||U ➢-18-23-28-33-33-41-48-60-70-87-102-124-144-170-190-210-236-258-284-315-350-390-435-490-540-600-660-740-840-940-1050-1150-1300-1450-1600-1850-2000-2300-2500-2900-3200V ➢22calculators/tolerances/tol?dev=v||V ➢000X-39-47-55-68-81-102-120-146-172-202-228-252-284-310-340-385-425-475-530-595-660-740-820-920-1000-1150-1300-1450-1600-1800-2000-2300-2500-2800-3100-3500-3900X ➢23calculators/tolerances/tol?dev=x||X ➢-20-28-34-40-45-54-64-80-97-122-146-178-210-248-280-310-340-385-425-475-525-590-660-740-820XXXXXXXXXXXXXXXXY ➢24calculators/tolerances/tol?dev=y||Y ➢000XX-63-75-94-114-144-174-214-254-300-340-380-425-470-520-580-650-730-820-920-1000XXXXXXXXXXXXXXXXZ ➢25calculators/tolerances/tol?dev=z||Z ➢-26-35-42-50-60-73-88-112-136-172-210-258-310-365-415-465-520-575-640-710-790-900-1000-1100-1250XXXXXXXXXXXXXXXXZA ➢26calculators/tolerances/tol?dev=za||ZA ➢-32-42-52-64-77-98-118-148-180-226-274-335-400-470-535-600-670-740-820-920-1000-1150-1300-1450-1600XXXXXXXXXXXXXXXXFundamental deviation of shafts ChartClick the Tolerance Link (e.g., g ➢) to get the Full & Accurate charts for a specific deviation in Inch and Metric unitsClick  icons to show all columns of the entire diameter range (0-3,150 mm)The deviations of J through Z also depend on the IT Therefore, the values in the below table are only accurate in some cases. To get the correct value in all cases, click the Tolerance Link (e.g., g ➢).Dimentions in Microns. To convert to millimeters, divide by 1000, to Thous, divide by 25.4 Deviationidurl0 - 3 mm3 - 6 mm6 - 1010 - 1414 - 1818 - 2424 - 3030 - 4040 - 5050 - 6565 - 8080 - 100100 - 120120 - 140140 - 160160 - 180180 - 200200 - 225225 - 250250 - 280280 - 315315 - 355355 - 400400 - 450450 - 500500 - 560560 - 630630 - 710710 - 800800 - 900900 - 10001000 - 11201120 - 12501250 - 14001400 - 16001600 - 18001800 - 20002000 - 22402240 - 25002500 - 28002800 - 3150a ➢1calculators/tolerances/tol?dev=a||A ➢-270-270-280-290-290-300-300-310-320-340-360-380-410-460-520-580-660-740-820-920-1050-1200-1350-1500-1650XXXXXXXXXXXXXXXXb ➢2calculators/tolerances/tol?dev=b||B ➢-140-140-150-150-150-160-160-170-180-190-200-220-240-260-280-310-340-380-420-480-540-600-680-760-840XXXXXXXXXXXXXXXXc ➢3calculators/tolerances/tol?dev=c||C ➢-60-70-80-95-95-110-110-120-130-140-150-170-180-200-210-230-240-260-280-300-330-360-400-440-480-520-580-640-700-780-860-940-1050-1150-1300-1450-1600-1800-2000-2200-2500cd ➢4calculators/tolerances/tol?dev=cd||CD ➢-34-46-56XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXd ➢5calculators/tolerances/tol?dev=d||D ➢-20-30-40-50-50-65-65-80-80-100-100-120-120-145-145-145-170-170-170-190-190-210-210-230-230-260-260-290-290-320-320-350-350-390-390-430-430-480-480-520-520e ➢6calculators/tolerances/tol?dev=e||E ➢-14-20-25-32-32-40-40-50-50-60-60-72-72-85-85-85-100-100-100-110-110-125-125-135-135-145-145-160-160-170-170-195-195-220-220-240-240-260-260-290-290ef ➢7calculators/tolerances/tol?dev=ef||EF ➢-10-14-18XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXf ➢8calculators/tolerances/tol?dev=f||F ➢-6-10-13-16-16-20-20-25-25-30-30-36-36-43-43-43-50-50-50-56-56-62-62-68-68-76-76-80-80-86-86-98-98-110-110-120-120-130-130-145-145fg ➢9calculators/tolerances/tol?dev=fg||FG ➢-4-6-8XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXg ➢10calculators/tolerances/tol?dev=g||G ➢-2-4-5-6-6-7-7-9-9-10-10-12-12-14-14-14-15-15-15-17-17-18-18-20-20-22-22-24-24-26-26-28-28-30-30-32-32-34-34-38-38h ➢11calculators/tolerances/tol?dev=h||H ➢00000000000000000000000000000000000000000js ➢12calculators/tolerances/tol?dev=js||JS ➢00000000000000000000000000000000000000000j ➢13calculators/tolerances/tol?dev=j||J ➢-4-6-8-10-10-12-12-14-14-18-18-22-22-26-26-26-30-30-30-36-36-39-39-43-43XXXXXXXXXXXXXXXXk ➢14calculators/tolerances/tol?dev=k||K ➢01111222222333334444444550000000000000000m ➢15calculators/tolerances/tol?dev=m||M ➢2467788991111131315151517171720202121232326263030343440404848585868687676n ➢16calculators/tolerances/tol?dev=n||N ➢481012121515171720202323272727313131343437374040444450505656666678789292110110135135p ➢17calculators/tolerances/tol?dev=p||P ➢612151818222226263232373743434350505056566262686878788888100100120120140140170170195195240240r ➢18calculators/tolerances/tol?dev=r||R ➢101519232328283434414351546365687780849498108114126132150155175185210220250260300330370400440460550580s ➢19calculators/tolerances/tol?dev=s||S ➢14192328283535434353597179921001081221301401581701902082322522803103403804304705205806407208209201000110012501400t ➢20calculators/tolerances/tol?dev=t||T ➢000XXX4148546675911041221341461661801962182402682943303604004505005606206807808409601050120013501500165019002100u ➢21calculators/tolerances/tol?dev=u||U ➢1823283333414860708710212414417019021023625828431535039043549054060066074084094010501150130014501600185020002300250029003200v ➢22calculators/tolerances/tol?dev=v||V ➢000X39475568811021201461722022282522843103403854254755305956607408209201000115013001450160018002000230025002800310035003900x ➢23calculators/tolerances/tol?dev=x||X ➢202834404554648097122146178210248280310340385425475525590660740820XXXXXXXXXXXXXXXXy ➢24calculators/tolerances/tol?dev=y||Y ➢000XX6375941141441742142543003403804254705205806507308209201000XXXXXXXXXXXXXXXXz ➢25calculators/tolerances/tol?dev=z||Z ➢26354250607388112136172210258310365415465520575640710790900100011001250XXXXXXXXXXXXXXXXza ➢26calculators/tolerances/tol?dev=za||ZA ➢32425264779811814818022627433540047053560067074082092010001150130014501600XXXXXXXXXXXXXXXXEngineering FitsEngineering fit refers to the degree of tightness or looseness between two mating parts in an assembly. It is defined by combining a hole with a tolerance class and a shaft with a tolerance class. (See definition of terms above).Several standards define recommended pairings for different applications. The values presented in our charts and Calculator are based on ISO 286-1:2010 (In earlier revisions, it was separated into ISO 1829, which is now obsolete). In North America, additional fit combinations are sometimes used per ANSI B4.1 & B4.2. The ANSI tolerancing system is nearly equivalent to ISO 286 but not identical. The difference is typically 0.1-0.5 thous.Main Fit TypesClearance FitA clearance fit is a type in which the shaft is smaller than the hole it is inserted into, allowing for free movement, assembly, and disassembly. Clearance fits can range from loose-running for assemblies that need a significant gap for free movement or to accommodate temperature variation to locational clearance for stationary parts that need to be freely assembled/disassembled but still maintain accuracy.Transition FitA transition fit is a type in which the shaft may be slightly smaller or larger than the hole (before assembly). It is used to create a tight and secure connection between them in applications requiring high precision and stability. It provides high accuracy, but the connecting parts can be disassembled and reassembled without damage. However, force cannot be transmitted.Press Fit (Interference)An interference (Press) fit is a type in which the shaft is larger than the hole (before assembly). It creates a frictional force that holds the parts together without the need for additional fasteners or adhesives. The interference fit is commonly used in mechanical engineering to create solid and reliable connections between components that need to withstand heavy loads or vibrations. However, It is hard to disassemble without damaging the parts. Some degree of force can be transmitted between the components.Fits are also divided into two types of “basis”There are no technical differences between the two basis. Therefore the choice of the system should be based on economic reasons.Hole Basis FitsThe hole deviation is zero (meaning an H), and the shaft deviation varies to create different fit levels. For example, H9/d8 , H7/g6. It is the first choice of combinations for general use, since it avoids an unnecessary multiplicity of tools (e.g., reamers) and gaugesShaft Basis FitsThe shaft deviation is zero (meaning an h), and the hole deviation varies to create different fit levels. For example, D9/h9, G7/h6. This method should only be utilized when it offers clear economic benefits, such as in situations where it is required to assemble multiple parts with holes that have varying deviations onto a single shaft.Fits Standard Combinations ChartsFor ordinary engineering purposes, only a small number of the many (~150,000) possible fit combinations is required. ISO 286-1:2010 lists about 80 fit combinations that meet most of the needs of any engineering task. You can choose from this list or define a custom combination in our Fit Calculator.(*) In North America, additional fit combinations are sometimes used per ANSI B4.1 & B4.2. You can find below the ISO charts also the ANSI Charts.Click the Fit Link (e.g. G7/h6 ➢) to get its detailed tolerances in both Inch and millimetersHole Basis Fits (ISO 286-1)fit_typeFitFit LevelPreferedc_idfit_sortFit typeLeveliH10/b9 ➢DGNC1Clearance Fit6.00iH11/b11 ➢DGYC1Clearance Fit6.00iH10/c9 ➢DGNC1Clearance Fit5.00iH11/c11 ➢DGYC1Clearance Fit5.00iH8/d8 ➢GRNC1Clearance Fit4.00iH9/d8 ➢GRNC1Clearance Fit4.00iH10/d9 ➢GRYC1Clearance Fit4.00iH11/d10 ➢GRNC1Clearance Fit4.00iH10/e9 ➢GRNC1Clearance Fit3.00iH9/e8 ➢GRYC1Clearance Fit3.00iH8/e8 ➢GRYC1Clearance Fit3.00iH8/e7 ➢GRNC1Clearance Fit3.00iH7/f6 ➢LGNC1Clearance Fit2.00iH9/f8 ➢LGNC1Clearance Fit2.00iH8/f8 ➢LGNC1Clearance Fit2.00iH8/f7 ➢LGYC1Clearance Fit2.00iH7/g6 ➢LGYC1Clearance Fit1.00iH6/g5 ➢LGNC1Clearance Fit1.00iH10/h9 ➢LGYC1Clearance Fit0.00iH11/h10 ➢LGNC1Clearance Fit0.00iH9/h8 ➢LGNC1Clearance Fit0.00iH8/h8 ➢LGNC1Clearance Fit0.00iH6/h5 ➢LGNC1Clearance Fit0.00iH7/h6 ➢LGYC1Clearance Fit0.00iH8/h7 ➢LGYC1Clearance Fit-1.00iH6/js5 ➢orNT2Transition Fit-1.00iH7/js6 ➢orYT2Transition Fit-1.00iH8/k7 ➢orNT2Transition Fit-3.00iH6/k5 ➢orNT2Transition Fit-3.00iH7/k6 ➢orYT2Transition Fit-3.00iH7/m6 ➢orNT2Transition Fit-5.00iH6/m5 ➢orNT2Transition Fit-5.00iH8/m7 ➢orNT2Transition Fit-5.00iH7/n6 ➢orYT2Transition Fit-6.00iH8/js7 ➢orNT2Transition Fit-11.00iH6/n5 ➢LRNI3Press Fit (Interference)-6.00iH7/p6 ➢LRYI3Press Fit (Interference)-8.00iH6/p5 ➢LRNI3Press Fit (Interference)-8.00iH7/r6 ➢LRYI3Press Fit (Interference)-10.00iH7/s6 ➢RDYI3Press Fit (Interference)-11.00iH8/s7 ➢RDNI3Press Fit (Interference)-11.00iH7/t6 ➢RDNI3Press Fit (Interference)-12.00iH7/u6 ➢DRNI3Press Fit (Interference)-13.00iH8/u7 ➢DRNI3Press Fit (Interference)-13.00iH7/x6 ➢DRNI3Press Fit (Interference)-16.00Shaft Basis Fits (ISO 286-1)fit_typeFitFit LevelPreferedc_idfit_sortFit typeLeveliH10/b9 ➢DGNC1Clearance Fit6.00iH11/b11 ➢DGYC1Clearance Fit6.00iH10/c9 ➢DGNC1Clearance Fit5.00iH11/c11 ➢DGYC1Clearance Fit5.00iH8/d8 ➢GRNC1Clearance Fit4.00iH9/d8 ➢GRNC1Clearance Fit4.00iH10/d9 ➢GRYC1Clearance Fit4.00iH11/d10 ➢GRNC1Clearance Fit4.00iH10/e9 ➢GRNC1Clearance Fit3.00iH9/e8 ➢GRYC1Clearance Fit3.00iH8/e8 ➢GRYC1Clearance Fit3.00iH8/e7 ➢GRNC1Clearance Fit3.00iH7/f6 ➢LGNC1Clearance Fit2.00iH9/f8 ➢LGNC1Clearance Fit2.00iH8/f8 ➢LGNC1Clearance Fit2.00iH8/f7 ➢LGYC1Clearance Fit2.00iH7/g6 ➢LGYC1Clearance Fit1.00iH6/g5 ➢LGNC1Clearance Fit1.00iH10/h9 ➢LGYC1Clearance Fit0.00iH11/h10 ➢LGNC1Clearance Fit0.00iH9/h8 ➢LGNC1Clearance Fit0.00iH8/h8 ➢LGNC1Clearance Fit0.00iH6/h5 ➢LGNC1Clearance Fit0.00iH7/h6 ➢LGYC1Clearance Fit0.00iH8/h7 ➢LGYC1Clearance Fit-1.00iH6/js5 ➢orNT2Transition Fit-1.00iH7/js6 ➢orYT2Transition Fit-1.00iH8/k7 ➢orNT2Transition Fit-3.00iH6/k5 ➢orNT2Transition Fit-3.00iH7/k6 ➢orYT2Transition Fit-3.00iH7/m6 ➢orNT2Transition Fit-5.00iH6/m5 ➢orNT2Transition Fit-5.00iH8/m7 ➢orNT2Transition Fit-5.00iH7/n6 ➢orYT2Transition Fit-6.00iH8/js7 ➢orNT2Transition Fit-11.00iH6/n5 ➢LRNI3Press Fit (Interference)-6.00iH7/p6 ➢LRYI3Press Fit (Interference)-8.00iH6/p5 ➢LRNI3Press Fit (Interference)-8.00iH7/r6 ➢LRYI3Press Fit (Interference)-10.00iH7/s6 ➢RDYI3Press Fit (Interference)-11.00iH8/s7 ➢RDNI3Press Fit (Interference)-11.00iH7/t6 ➢RDNI3Press Fit (Interference)-12.00iH7/u6 ➢DRNI3Press Fit (Interference)-13.00iH8/u7 ➢DRNI3Press Fit (Interference)-13.00iH7/x6 ➢DRNI3Press Fit (Interference)-16.00Fit Combinations Per ANSI B4.1The tolerance classes mentioned in ANSI B4.1 (e.g., h9, g6, etc.) have the same nomenclature as in ISO 286. It could lead a confusion since the ANSI standard also defines the fundamental deviations and the tolerance grade on its own. The ANSI tolerancing system is nearly the same as the ISO 286 but not identical. If you take the values from the standard ISO charts or use our Online Calculator, you should expect about 0.1-0.5 thous errors. wdt_IDFit NameTolerance Class CombinationFit Typeth1RC 1H5/g4Running or Slidining Fits52RC 2H6/g5Running or Slidining Fits63RC 3H7/f6Running or Slidining Fits74RC 4H8/f7Running or Slidining Fits85RC 5H8/e7Running or Slidining Fits86RC 6H9/e8Running or Slidining Fits97RC 7H9/d8Running or Slidining Fits98RC 8H10/c9Running or Slidining Fits109RC 9H11/sh1Running or Slidining Fits1110LC 1H6/h5Clearance Location Fits611LC 2H7/h6Clearance Location Fits712LC 3H8/h7Clearance Location Fits813LC 4H10/h9Clearance Location Fits1014LC 5H7/g6Clearance Location Fits715LC 6H9/f8Clearance Location Fits916LC 7H10/e9Clearance Location Fits1017LC 8H10/d9Clearance Location Fits1018LC 9H11/c10Clearance Location Fits1119LC 10H12/sh2Clearance Location Fits1220LC 11H13/sh3Clearance Location Fits1321LT 1H7/js6Transition Fits722LT 2H8/js7Transition Fits823LT 3H7/k6Transition Fits724LT 4H8/k7Transition Fits825LT 5H7/n6Transition Fits726LT 6H7/n7Transition Fits727LN 1H6/n5Interference Location Fits628LN 2H7/p6Interference Location Fits729LN 3H7/r6Interference Location Fits730FN 1H6/sh4Force or Shrink Fits631FN 2H7/s6Force or Shrink Fits732FN 3H7/t6Force or Shrink Fits733FN 4H7/u6Force or Shrink Fits734FN 5H8/x7Force or Shrink Fits8Fit Combinations Per ANSI B4.2The tolerance classes mentioned in ANSI B4.1 (e.g., h9, g6, etc.) have the same nomenclature as in ISO 286. It could lead a confusion since the ANSI standard also defines the fundamental deviations and the tolerance grade on its own. The ANSI tolerancing system is nearly the same as the ISO 286 but not identical. If you take the values from the standard ISO charts or use our Online Calculator, you should expect about 0.1-0.5 thous errors.ClassificationHole BasisShaft BasisDescriptionClearanceH11/c11C11/h11Loose running fit for wide commercial tolerances or allowances on external members.H9/d9D9/h9Free running fit not for use where accuracy is essential, but good for large temperature variations, high running speeds, or heavy journal pressures.H8/f7F8/h7Close running fit for running on accurate machines and for accurate location at moderate speeds and journal pressures.H7/g6G7/h6Sliding fit not intended to run freely, but to move and turn freely and locate accurately.H7/h6H7/h6Locational clearance fit provides snug fit for locating stationary parts; but can be freely assembled and disassembled.InterferenceH7/k6K7/h6Locational transition fit for accurate location, a compromise between clearance and interference.H7/n6N7/h6Locational transition fit for more accurate location where greater interference is permissible.TransitionH7/p6P7/h6Locational interference fit for parts requiring rigidity and alignment with prime accuracy of location but without special bore pressure requirements.H7/s6S7/h6Medium drive fit for ordinary steel parts or shrink fits on light sections, the tightest fit usable with cast iron.H7/u6U7/h6Force fit suitable for parts which can be highly stressed or for shrink fits where the heavy pressing forces required are impractical.Related Glossary Terms:Thou

Although it increases the tensile strength of steel and improves machinability it is generally regarded as an undesirable impurity because of its embrittling effect.

Effect of phosphorus element will have various effects on steel depending on concentration. The maximum amount of phosphorus in higher grade steel is between 0.03 to 0.05% due to the fact that is detrimental. Up to 0.10% of phosphorus in low-alloy high-strength steels will increase the strength as well as improve the steel’s resistance against corrosion. The possibility of brittlement increases when the content in hardened steel is too high. Even though the strength and hardness is improved, the ductility and toughness decreases.

The addition of lead in levels in very small amounts to improve machinability, up to 0.30%, improves machinability. Providing the distribution is homogenous it has little effect on the physical properties of the steel, and contrary to popular belief, it does not affect weld ability.

Silicon dissolves in iron and tends to strengthen it. Some filler metals may contain up to 1% to provide enhanced cleaning and deoxidation for welding on contaminated surfaces. When these filler metals are used for welding on clean surfaces, the resulting weld metal strength will be markedly increased. Silicon increases strength and hardness but to a lesser extent than manganese. The resulting decrease in ductility could resent cracking problems.

36904 Wiha Wrenches Ball End Long Arm Hex L-Key 1.5mm datasheet, inventory, & pricing.

Engineering fit refers to the degree of tightness or looseness between two mating parts in an assembly. It is defined by combining a hole with a tolerance class and a shaft with a tolerance class. (See definition of terms above).Several standards define recommended pairings for different applications. The values presented in our charts and Calculator are based on ISO 286-1:2010 (In earlier revisions, it was separated into ISO 1829, which is now obsolete). In North America, additional fit combinations are sometimes used per ANSI B4.1 & B4.2. The ANSI tolerancing system is nearly equivalent to ISO 286 but not identical. The difference is typically 0.1-0.5 thous.Main Fit TypesClearance FitA clearance fit is a type in which the shaft is smaller than the hole it is inserted into, allowing for free movement, assembly, and disassembly. Clearance fits can range from loose-running for assemblies that need a significant gap for free movement or to accommodate temperature variation to locational clearance for stationary parts that need to be freely assembled/disassembled but still maintain accuracy.Transition FitA transition fit is a type in which the shaft may be slightly smaller or larger than the hole (before assembly). It is used to create a tight and secure connection between them in applications requiring high precision and stability. It provides high accuracy, but the connecting parts can be disassembled and reassembled without damage. However, force cannot be transmitted.Press Fit (Interference)An interference (Press) fit is a type in which the shaft is larger than the hole (before assembly). It creates a frictional force that holds the parts together without the need for additional fasteners or adhesives. The interference fit is commonly used in mechanical engineering to create solid and reliable connections between components that need to withstand heavy loads or vibrations. However, It is hard to disassemble without damaging the parts. Some degree of force can be transmitted between the components.Fits are also divided into two types of “basis”There are no technical differences between the two basis. Therefore the choice of the system should be based on economic reasons.Hole Basis FitsThe hole deviation is zero (meaning an H), and the shaft deviation varies to create different fit levels. For example, H9/d8 , H7/g6. It is the first choice of combinations for general use, since it avoids an unnecessary multiplicity of tools (e.g., reamers) and gaugesShaft Basis FitsThe shaft deviation is zero (meaning an h), and the hole deviation varies to create different fit levels. For example, D9/h9, G7/h6. This method should only be utilized when it offers clear economic benefits, such as in situations where it is required to assemble multiple parts with holes that have varying deviations onto a single shaft.Fits Standard Combinations ChartsFor ordinary engineering purposes, only a small number of the many (~150,000) possible fit combinations is required. ISO 286-1:2010 lists about 80 fit combinations that meet most of the needs of any engineering task. You can choose from this list or define a custom combination in our Fit Calculator.(*) In North America, additional fit combinations are sometimes used per ANSI B4.1 & B4.2. You can find below the ISO charts also the ANSI Charts.Click the Fit Link (e.g. G7/h6 ➢) to get its detailed tolerances in both Inch and millimetersHole Basis Fits (ISO 286-1)fit_typeFitFit LevelPreferedc_idfit_sortFit typeLeveliH10/b9 ➢DGNC1Clearance Fit6.00iH11/b11 ➢DGYC1Clearance Fit6.00iH10/c9 ➢DGNC1Clearance Fit5.00iH11/c11 ➢DGYC1Clearance Fit5.00iH8/d8 ➢GRNC1Clearance Fit4.00iH9/d8 ➢GRNC1Clearance Fit4.00iH10/d9 ➢GRYC1Clearance Fit4.00iH11/d10 ➢GRNC1Clearance Fit4.00iH10/e9 ➢GRNC1Clearance Fit3.00iH9/e8 ➢GRYC1Clearance Fit3.00iH8/e8 ➢GRYC1Clearance Fit3.00iH8/e7 ➢GRNC1Clearance Fit3.00iH7/f6 ➢LGNC1Clearance Fit2.00iH9/f8 ➢LGNC1Clearance Fit2.00iH8/f8 ➢LGNC1Clearance Fit2.00iH8/f7 ➢LGYC1Clearance Fit2.00iH7/g6 ➢LGYC1Clearance Fit1.00iH6/g5 ➢LGNC1Clearance Fit1.00iH10/h9 ➢LGYC1Clearance Fit0.00iH11/h10 ➢LGNC1Clearance Fit0.00iH9/h8 ➢LGNC1Clearance Fit0.00iH8/h8 ➢LGNC1Clearance Fit0.00iH6/h5 ➢LGNC1Clearance Fit0.00iH7/h6 ➢LGYC1Clearance Fit0.00iH8/h7 ➢LGYC1Clearance Fit-1.00iH6/js5 ➢orNT2Transition Fit-1.00iH7/js6 ➢orYT2Transition Fit-1.00iH8/k7 ➢orNT2Transition Fit-3.00iH6/k5 ➢orNT2Transition Fit-3.00iH7/k6 ➢orYT2Transition Fit-3.00iH7/m6 ➢orNT2Transition Fit-5.00iH6/m5 ➢orNT2Transition Fit-5.00iH8/m7 ➢orNT2Transition Fit-5.00iH7/n6 ➢orYT2Transition Fit-6.00iH8/js7 ➢orNT2Transition Fit-11.00iH6/n5 ➢LRNI3Press Fit (Interference)-6.00iH7/p6 ➢LRYI3Press Fit (Interference)-8.00iH6/p5 ➢LRNI3Press Fit (Interference)-8.00iH7/r6 ➢LRYI3Press Fit (Interference)-10.00iH7/s6 ➢RDYI3Press Fit (Interference)-11.00iH8/s7 ➢RDNI3Press Fit (Interference)-11.00iH7/t6 ➢RDNI3Press Fit (Interference)-12.00iH7/u6 ➢DRNI3Press Fit (Interference)-13.00iH8/u7 ➢DRNI3Press Fit (Interference)-13.00iH7/x6 ➢DRNI3Press Fit (Interference)-16.00Shaft Basis Fits (ISO 286-1)fit_typeFitFit LevelPreferedc_idfit_sortFit typeLeveliH10/b9 ➢DGNC1Clearance Fit6.00iH11/b11 ➢DGYC1Clearance Fit6.00iH10/c9 ➢DGNC1Clearance Fit5.00iH11/c11 ➢DGYC1Clearance Fit5.00iH8/d8 ➢GRNC1Clearance Fit4.00iH9/d8 ➢GRNC1Clearance Fit4.00iH10/d9 ➢GRYC1Clearance Fit4.00iH11/d10 ➢GRNC1Clearance Fit4.00iH10/e9 ➢GRNC1Clearance Fit3.00iH9/e8 ➢GRYC1Clearance Fit3.00iH8/e8 ➢GRYC1Clearance Fit3.00iH8/e7 ➢GRNC1Clearance Fit3.00iH7/f6 ➢LGNC1Clearance Fit2.00iH9/f8 ➢LGNC1Clearance Fit2.00iH8/f8 ➢LGNC1Clearance Fit2.00iH8/f7 ➢LGYC1Clearance Fit2.00iH7/g6 ➢LGYC1Clearance Fit1.00iH6/g5 ➢LGNC1Clearance Fit1.00iH10/h9 ➢LGYC1Clearance Fit0.00iH11/h10 ➢LGNC1Clearance Fit0.00iH9/h8 ➢LGNC1Clearance Fit0.00iH8/h8 ➢LGNC1Clearance Fit0.00iH6/h5 ➢LGNC1Clearance Fit0.00iH7/h6 ➢LGYC1Clearance Fit0.00iH8/h7 ➢LGYC1Clearance Fit-1.00iH6/js5 ➢orNT2Transition Fit-1.00iH7/js6 ➢orYT2Transition Fit-1.00iH8/k7 ➢orNT2Transition Fit-3.00iH6/k5 ➢orNT2Transition Fit-3.00iH7/k6 ➢orYT2Transition Fit-3.00iH7/m6 ➢orNT2Transition Fit-5.00iH6/m5 ➢orNT2Transition Fit-5.00iH8/m7 ➢orNT2Transition Fit-5.00iH7/n6 ➢orYT2Transition Fit-6.00iH8/js7 ➢orNT2Transition Fit-11.00iH6/n5 ➢LRNI3Press Fit (Interference)-6.00iH7/p6 ➢LRYI3Press Fit (Interference)-8.00iH6/p5 ➢LRNI3Press Fit (Interference)-8.00iH7/r6 ➢LRYI3Press Fit (Interference)-10.00iH7/s6 ➢RDYI3Press Fit (Interference)-11.00iH8/s7 ➢RDNI3Press Fit (Interference)-11.00iH7/t6 ➢RDNI3Press Fit (Interference)-12.00iH7/u6 ➢DRNI3Press Fit (Interference)-13.00iH8/u7 ➢DRNI3Press Fit (Interference)-13.00iH7/x6 ➢DRNI3Press Fit (Interference)-16.00Fit Combinations Per ANSI B4.1The tolerance classes mentioned in ANSI B4.1 (e.g., h9, g6, etc.) have the same nomenclature as in ISO 286. It could lead a confusion since the ANSI standard also defines the fundamental deviations and the tolerance grade on its own. The ANSI tolerancing system is nearly the same as the ISO 286 but not identical. If you take the values from the standard ISO charts or use our Online Calculator, you should expect about 0.1-0.5 thous errors. wdt_IDFit NameTolerance Class CombinationFit Typeth1RC 1H5/g4Running or Slidining Fits52RC 2H6/g5Running or Slidining Fits63RC 3H7/f6Running or Slidining Fits74RC 4H8/f7Running or Slidining Fits85RC 5H8/e7Running or Slidining Fits86RC 6H9/e8Running or Slidining Fits97RC 7H9/d8Running or Slidining Fits98RC 8H10/c9Running or Slidining Fits109RC 9H11/sh1Running or Slidining Fits1110LC 1H6/h5Clearance Location Fits611LC 2H7/h6Clearance Location Fits712LC 3H8/h7Clearance Location Fits813LC 4H10/h9Clearance Location Fits1014LC 5H7/g6Clearance Location Fits715LC 6H9/f8Clearance Location Fits916LC 7H10/e9Clearance Location Fits1017LC 8H10/d9Clearance Location Fits1018LC 9H11/c10Clearance Location Fits1119LC 10H12/sh2Clearance Location Fits1220LC 11H13/sh3Clearance Location Fits1321LT 1H7/js6Transition Fits722LT 2H8/js7Transition Fits823LT 3H7/k6Transition Fits724LT 4H8/k7Transition Fits825LT 5H7/n6Transition Fits726LT 6H7/n7Transition Fits727LN 1H6/n5Interference Location Fits628LN 2H7/p6Interference Location Fits729LN 3H7/r6Interference Location Fits730FN 1H6/sh4Force or Shrink Fits631FN 2H7/s6Force or Shrink Fits732FN 3H7/t6Force or Shrink Fits733FN 4H7/u6Force or Shrink Fits734FN 5H8/x7Force or Shrink Fits8Fit Combinations Per ANSI B4.2The tolerance classes mentioned in ANSI B4.1 (e.g., h9, g6, etc.) have the same nomenclature as in ISO 286. It could lead a confusion since the ANSI standard also defines the fundamental deviations and the tolerance grade on its own. The ANSI tolerancing system is nearly the same as the ISO 286 but not identical. If you take the values from the standard ISO charts or use our Online Calculator, you should expect about 0.1-0.5 thous errors.ClassificationHole BasisShaft BasisDescriptionClearanceH11/c11C11/h11Loose running fit for wide commercial tolerances or allowances on external members.H9/d9D9/h9Free running fit not for use where accuracy is essential, but good for large temperature variations, high running speeds, or heavy journal pressures.H8/f7F8/h7Close running fit for running on accurate machines and for accurate location at moderate speeds and journal pressures.H7/g6G7/h6Sliding fit not intended to run freely, but to move and turn freely and locate accurately.H7/h6H7/h6Locational clearance fit provides snug fit for locating stationary parts; but can be freely assembled and disassembled.InterferenceH7/k6K7/h6Locational transition fit for accurate location, a compromise between clearance and interference.H7/n6N7/h6Locational transition fit for more accurate location where greater interference is permissible.TransitionH7/p6P7/h6Locational interference fit for parts requiring rigidity and alignment with prime accuracy of location but without special bore pressure requirements.H7/s6S7/h6Medium drive fit for ordinary steel parts or shrink fits on light sections, the tightest fit usable with cast iron.H7/u6U7/h6Force fit suitable for parts which can be highly stressed or for shrink fits where the heavy pressing forces required are impractical.Related Glossary Terms:Thou

Oct 28, 2022 — These types of tool steel have a carbon content of 0.05-2.85% and up to 5% chromium content. Furthermore, this grade of tool steel is very tough ...

The tolerance classes mentioned in ANSI B4.1 (e.g., h9, g6, etc.) have the same nomenclature as in ISO 286. It could lead a confusion since the ANSI standard also defines the fundamental deviations and the tolerance grade on its own. The ANSI tolerancing system is nearly the same as the ISO 286 but not identical. If you take the values from the standard ISO charts or use our Online Calculator, you should expect about 0.1-0.5 thous errors. wdt_IDFit NameTolerance Class CombinationFit Typeth1RC 1H5/g4Running or Slidining Fits52RC 2H6/g5Running or Slidining Fits63RC 3H7/f6Running or Slidining Fits74RC 4H8/f7Running or Slidining Fits85RC 5H8/e7Running or Slidining Fits86RC 6H9/e8Running or Slidining Fits97RC 7H9/d8Running or Slidining Fits98RC 8H10/c9Running or Slidining Fits109RC 9H11/sh1Running or Slidining Fits1110LC 1H6/h5Clearance Location Fits611LC 2H7/h6Clearance Location Fits712LC 3H8/h7Clearance Location Fits813LC 4H10/h9Clearance Location Fits1014LC 5H7/g6Clearance Location Fits715LC 6H9/f8Clearance Location Fits916LC 7H10/e9Clearance Location Fits1017LC 8H10/d9Clearance Location Fits1018LC 9H11/c10Clearance Location Fits1119LC 10H12/sh2Clearance Location Fits1220LC 11H13/sh3Clearance Location Fits1321LT 1H7/js6Transition Fits722LT 2H8/js7Transition Fits823LT 3H7/k6Transition Fits724LT 4H8/k7Transition Fits825LT 5H7/n6Transition Fits726LT 6H7/n7Transition Fits727LN 1H6/n5Interference Location Fits628LN 2H7/p6Interference Location Fits729LN 3H7/r6Interference Location Fits730FN 1H6/sh4Force or Shrink Fits631FN 2H7/s6Force or Shrink Fits732FN 3H7/t6Force or Shrink Fits733FN 4H7/u6Force or Shrink Fits734FN 5H8/x7Force or Shrink Fits8Fit Combinations Per ANSI B4.2The tolerance classes mentioned in ANSI B4.1 (e.g., h9, g6, etc.) have the same nomenclature as in ISO 286. It could lead a confusion since the ANSI standard also defines the fundamental deviations and the tolerance grade on its own. The ANSI tolerancing system is nearly the same as the ISO 286 but not identical. If you take the values from the standard ISO charts or use our Online Calculator, you should expect about 0.1-0.5 thous errors.ClassificationHole BasisShaft BasisDescriptionClearanceH11/c11C11/h11Loose running fit for wide commercial tolerances or allowances on external members.H9/d9D9/h9Free running fit not for use where accuracy is essential, but good for large temperature variations, high running speeds, or heavy journal pressures.H8/f7F8/h7Close running fit for running on accurate machines and for accurate location at moderate speeds and journal pressures.H7/g6G7/h6Sliding fit not intended to run freely, but to move and turn freely and locate accurately.H7/h6H7/h6Locational clearance fit provides snug fit for locating stationary parts; but can be freely assembled and disassembled.InterferenceH7/k6K7/h6Locational transition fit for accurate location, a compromise between clearance and interference.H7/n6N7/h6Locational transition fit for more accurate location where greater interference is permissible.TransitionH7/p6P7/h6Locational interference fit for parts requiring rigidity and alignment with prime accuracy of location but without special bore pressure requirements.H7/s6S7/h6Medium drive fit for ordinary steel parts or shrink fits on light sections, the tightest fit usable with cast iron.H7/u6U7/h6Force fit suitable for parts which can be highly stressed or for shrink fits where the heavy pressing forces required are impractical.Related Glossary Terms:Thou

Ti is a very strong, very lightweight metal that can be used alone or alloyed with steels. It is added to steel to give them high strength at high temperatures. Modern jet engines used titanium steels.

During the heat treatment process boron, a replacement for other elements, is added to increase the hardenability of medium carbon steel. The cutting performance for high-speed steels is increased but at the expense of the forging quality. It is also possible that the content of boron can be too high which decreases hardenability, toughness as well as cause embrittlement. The percentage carbon present in the steel also plays a role in the hardenability effect of boron. As boron’s effect on hardenability increases the amount of carbon should proportionally be decreased.

PREMIUM MEMBERSHIP- Ads Free Browsing- Advanced Calculator Options- Quick Access Favorites BarFor Just 2$ / MonthLearn More

Sulfur is normally regarded as an impurity and has an adverse effect on impact properties when a steel is high in sulphur and low in manganese. Sulphur improves machinability but lowers transverse ductility and notched impact toughness and has little effects on the longitudinal mechanical properties. Its content is limited to 0.05% in steels but is added to free cutting steels in amount up to 0.35% with the manganese content increased to counter any detrimental effects since alloying additions of sulfur in amounts from 0.10% to 0.30% will tend to improve the machinability of a steel. Such types may be referred to as “resulfurized” or “freemachining”. Free cutting steels have sulphur added to improve machinability, usually up to a maximum of 0.35%.

Shaft refers to an external feature of a workpiece, typically cylindrical in shape. However, the term can be used to describe any external feature. For example, a block that has to fit into a keyway or the square shank of a cutting tool can also be referred to as a shaft.

Technical drawings often include notations such as “50 g6” or “17.5 H11/g8” to specify tolerances. However, determining the final limits can be time-consuming and involve navigating complex charts. Our Online Calculator streamlines this process and provides a detailed final result immediately. Additionally, we offer clear and interactive versions of the traditional charts and in-depth technical explanations of all related terminology.CalculatorChartsLearn

The hole deviation is zero (meaning an H), and the shaft deviation varies to create different fit levels. For example, H9/d8 , H7/g6. It is the first choice of combinations for general use, since it avoids an unnecessary multiplicity of tools (e.g., reamers) and gaugesShaft Basis FitsThe shaft deviation is zero (meaning an h), and the hole deviation varies to create different fit levels. For example, D9/h9, G7/h6. This method should only be utilized when it offers clear economic benefits, such as in situations where it is required to assemble multiple parts with holes that have varying deviations onto a single shaft.Fits Standard Combinations ChartsFor ordinary engineering purposes, only a small number of the many (~150,000) possible fit combinations is required. ISO 286-1:2010 lists about 80 fit combinations that meet most of the needs of any engineering task. You can choose from this list or define a custom combination in our Fit Calculator.(*) In North America, additional fit combinations are sometimes used per ANSI B4.1 & B4.2. You can find below the ISO charts also the ANSI Charts.Click the Fit Link (e.g. G7/h6 ➢) to get its detailed tolerances in both Inch and millimetersHole Basis Fits (ISO 286-1)fit_typeFitFit LevelPreferedc_idfit_sortFit typeLeveliH10/b9 ➢DGNC1Clearance Fit6.00iH11/b11 ➢DGYC1Clearance Fit6.00iH10/c9 ➢DGNC1Clearance Fit5.00iH11/c11 ➢DGYC1Clearance Fit5.00iH8/d8 ➢GRNC1Clearance Fit4.00iH9/d8 ➢GRNC1Clearance Fit4.00iH10/d9 ➢GRYC1Clearance Fit4.00iH11/d10 ➢GRNC1Clearance Fit4.00iH10/e9 ➢GRNC1Clearance Fit3.00iH9/e8 ➢GRYC1Clearance Fit3.00iH8/e8 ➢GRYC1Clearance Fit3.00iH8/e7 ➢GRNC1Clearance Fit3.00iH7/f6 ➢LGNC1Clearance Fit2.00iH9/f8 ➢LGNC1Clearance Fit2.00iH8/f8 ➢LGNC1Clearance Fit2.00iH8/f7 ➢LGYC1Clearance Fit2.00iH7/g6 ➢LGYC1Clearance Fit1.00iH6/g5 ➢LGNC1Clearance Fit1.00iH10/h9 ➢LGYC1Clearance Fit0.00iH11/h10 ➢LGNC1Clearance Fit0.00iH9/h8 ➢LGNC1Clearance Fit0.00iH8/h8 ➢LGNC1Clearance Fit0.00iH6/h5 ➢LGNC1Clearance Fit0.00iH7/h6 ➢LGYC1Clearance Fit0.00iH8/h7 ➢LGYC1Clearance Fit-1.00iH6/js5 ➢orNT2Transition Fit-1.00iH7/js6 ➢orYT2Transition Fit-1.00iH8/k7 ➢orNT2Transition Fit-3.00iH6/k5 ➢orNT2Transition Fit-3.00iH7/k6 ➢orYT2Transition Fit-3.00iH7/m6 ➢orNT2Transition Fit-5.00iH6/m5 ➢orNT2Transition Fit-5.00iH8/m7 ➢orNT2Transition Fit-5.00iH7/n6 ➢orYT2Transition Fit-6.00iH8/js7 ➢orNT2Transition Fit-11.00iH6/n5 ➢LRNI3Press Fit (Interference)-6.00iH7/p6 ➢LRYI3Press Fit (Interference)-8.00iH6/p5 ➢LRNI3Press Fit (Interference)-8.00iH7/r6 ➢LRYI3Press Fit (Interference)-10.00iH7/s6 ➢RDYI3Press Fit (Interference)-11.00iH8/s7 ➢RDNI3Press Fit (Interference)-11.00iH7/t6 ➢RDNI3Press Fit (Interference)-12.00iH7/u6 ➢DRNI3Press Fit (Interference)-13.00iH8/u7 ➢DRNI3Press Fit (Interference)-13.00iH7/x6 ➢DRNI3Press Fit (Interference)-16.00Shaft Basis Fits (ISO 286-1)fit_typeFitFit LevelPreferedc_idfit_sortFit typeLeveliH10/b9 ➢DGNC1Clearance Fit6.00iH11/b11 ➢DGYC1Clearance Fit6.00iH10/c9 ➢DGNC1Clearance Fit5.00iH11/c11 ➢DGYC1Clearance Fit5.00iH8/d8 ➢GRNC1Clearance Fit4.00iH9/d8 ➢GRNC1Clearance Fit4.00iH10/d9 ➢GRYC1Clearance Fit4.00iH11/d10 ➢GRNC1Clearance Fit4.00iH10/e9 ➢GRNC1Clearance Fit3.00iH9/e8 ➢GRYC1Clearance Fit3.00iH8/e8 ➢GRYC1Clearance Fit3.00iH8/e7 ➢GRNC1Clearance Fit3.00iH7/f6 ➢LGNC1Clearance Fit2.00iH9/f8 ➢LGNC1Clearance Fit2.00iH8/f8 ➢LGNC1Clearance Fit2.00iH8/f7 ➢LGYC1Clearance Fit2.00iH7/g6 ➢LGYC1Clearance Fit1.00iH6/g5 ➢LGNC1Clearance Fit1.00iH10/h9 ➢LGYC1Clearance Fit0.00iH11/h10 ➢LGNC1Clearance Fit0.00iH9/h8 ➢LGNC1Clearance Fit0.00iH8/h8 ➢LGNC1Clearance Fit0.00iH6/h5 ➢LGNC1Clearance Fit0.00iH7/h6 ➢LGYC1Clearance Fit0.00iH8/h7 ➢LGYC1Clearance Fit-1.00iH6/js5 ➢orNT2Transition Fit-1.00iH7/js6 ➢orYT2Transition Fit-1.00iH8/k7 ➢orNT2Transition Fit-3.00iH6/k5 ➢orNT2Transition Fit-3.00iH7/k6 ➢orYT2Transition Fit-3.00iH7/m6 ➢orNT2Transition Fit-5.00iH6/m5 ➢orNT2Transition Fit-5.00iH8/m7 ➢orNT2Transition Fit-5.00iH7/n6 ➢orYT2Transition Fit-6.00iH8/js7 ➢orNT2Transition Fit-11.00iH6/n5 ➢LRNI3Press Fit (Interference)-6.00iH7/p6 ➢LRYI3Press Fit (Interference)-8.00iH6/p5 ➢LRNI3Press Fit (Interference)-8.00iH7/r6 ➢LRYI3Press Fit (Interference)-10.00iH7/s6 ➢RDYI3Press Fit (Interference)-11.00iH8/s7 ➢RDNI3Press Fit (Interference)-11.00iH7/t6 ➢RDNI3Press Fit (Interference)-12.00iH7/u6 ➢DRNI3Press Fit (Interference)-13.00iH8/u7 ➢DRNI3Press Fit (Interference)-13.00iH7/x6 ➢DRNI3Press Fit (Interference)-16.00Fit Combinations Per ANSI B4.1The tolerance classes mentioned in ANSI B4.1 (e.g., h9, g6, etc.) have the same nomenclature as in ISO 286. It could lead a confusion since the ANSI standard also defines the fundamental deviations and the tolerance grade on its own. The ANSI tolerancing system is nearly the same as the ISO 286 but not identical. If you take the values from the standard ISO charts or use our Online Calculator, you should expect about 0.1-0.5 thous errors. wdt_IDFit NameTolerance Class CombinationFit Typeth1RC 1H5/g4Running or Slidining Fits52RC 2H6/g5Running or Slidining Fits63RC 3H7/f6Running or Slidining Fits74RC 4H8/f7Running or Slidining Fits85RC 5H8/e7Running or Slidining Fits86RC 6H9/e8Running or Slidining Fits97RC 7H9/d8Running or Slidining Fits98RC 8H10/c9Running or Slidining Fits109RC 9H11/sh1Running or Slidining Fits1110LC 1H6/h5Clearance Location Fits611LC 2H7/h6Clearance Location Fits712LC 3H8/h7Clearance Location Fits813LC 4H10/h9Clearance Location Fits1014LC 5H7/g6Clearance Location Fits715LC 6H9/f8Clearance Location Fits916LC 7H10/e9Clearance Location Fits1017LC 8H10/d9Clearance Location Fits1018LC 9H11/c10Clearance Location Fits1119LC 10H12/sh2Clearance Location Fits1220LC 11H13/sh3Clearance Location Fits1321LT 1H7/js6Transition Fits722LT 2H8/js7Transition Fits823LT 3H7/k6Transition Fits724LT 4H8/k7Transition Fits825LT 5H7/n6Transition Fits726LT 6H7/n7Transition Fits727LN 1H6/n5Interference Location Fits628LN 2H7/p6Interference Location Fits729LN 3H7/r6Interference Location Fits730FN 1H6/sh4Force or Shrink Fits631FN 2H7/s6Force or Shrink Fits732FN 3H7/t6Force or Shrink Fits733FN 4H7/u6Force or Shrink Fits734FN 5H8/x7Force or Shrink Fits8Fit Combinations Per ANSI B4.2The tolerance classes mentioned in ANSI B4.1 (e.g., h9, g6, etc.) have the same nomenclature as in ISO 286. It could lead a confusion since the ANSI standard also defines the fundamental deviations and the tolerance grade on its own. The ANSI tolerancing system is nearly the same as the ISO 286 but not identical. If you take the values from the standard ISO charts or use our Online Calculator, you should expect about 0.1-0.5 thous errors.ClassificationHole BasisShaft BasisDescriptionClearanceH11/c11C11/h11Loose running fit for wide commercial tolerances or allowances on external members.H9/d9D9/h9Free running fit not for use where accuracy is essential, but good for large temperature variations, high running speeds, or heavy journal pressures.H8/f7F8/h7Close running fit for running on accurate machines and for accurate location at moderate speeds and journal pressures.H7/g6G7/h6Sliding fit not intended to run freely, but to move and turn freely and locate accurately.H7/h6H7/h6Locational clearance fit provides snug fit for locating stationary parts; but can be freely assembled and disassembled.InterferenceH7/k6K7/h6Locational transition fit for accurate location, a compromise between clearance and interference.H7/n6N7/h6Locational transition fit for more accurate location where greater interference is permissible.TransitionH7/p6P7/h6Locational interference fit for parts requiring rigidity and alignment with prime accuracy of location but without special bore pressure requirements.H7/s6S7/h6Medium drive fit for ordinary steel parts or shrink fits on light sections, the tightest fit usable with cast iron.H7/u6U7/h6Force fit suitable for parts which can be highly stressed or for shrink fits where the heavy pressing forces required are impractical.Related Glossary Terms:Thou

Manganese could be the second most important element after Carbon on steel. Mn has effects similar to those of carbon, and the steel producer uses these two elements in combination to obtain a material with the desired properties. Manganese is a necessity for the process of hot rolling of steel by its combination with oxygen and sulfur.

Even though the effect of sulphur on steel is negative at certain stages, any sulphur content less than 0.05% has a positive effect on steel grades.

Copper is another primary corrosion resistance elements. It also has a small impact on hardenability. It is typically found in amounts not less than 0.20 percent, and is the primary anti-corrosion component in steel grades like A242 and A441.

A clearance fit is a type in which the shaft is smaller than the hole it is inserted into, allowing for free movement, assembly, and disassembly. Clearance fits can range from loose-running for assemblies that need a significant gap for free movement or to accommodate temperature variation to locational clearance for stationary parts that need to be freely assembled/disassembled but still maintain accuracy.Transition FitA transition fit is a type in which the shaft may be slightly smaller or larger than the hole (before assembly). It is used to create a tight and secure connection between them in applications requiring high precision and stability. It provides high accuracy, but the connecting parts can be disassembled and reassembled without damage. However, force cannot be transmitted.Press Fit (Interference)An interference (Press) fit is a type in which the shaft is larger than the hole (before assembly). It creates a frictional force that holds the parts together without the need for additional fasteners or adhesives. The interference fit is commonly used in mechanical engineering to create solid and reliable connections between components that need to withstand heavy loads or vibrations. However, It is hard to disassemble without damaging the parts. Some degree of force can be transmitted between the components.Fits are also divided into two types of “basis”There are no technical differences between the two basis. Therefore the choice of the system should be based on economic reasons.Hole Basis FitsThe hole deviation is zero (meaning an H), and the shaft deviation varies to create different fit levels. For example, H9/d8 , H7/g6. It is the first choice of combinations for general use, since it avoids an unnecessary multiplicity of tools (e.g., reamers) and gaugesShaft Basis FitsThe shaft deviation is zero (meaning an h), and the hole deviation varies to create different fit levels. For example, D9/h9, G7/h6. This method should only be utilized when it offers clear economic benefits, such as in situations where it is required to assemble multiple parts with holes that have varying deviations onto a single shaft.Fits Standard Combinations ChartsFor ordinary engineering purposes, only a small number of the many (~150,000) possible fit combinations is required. ISO 286-1:2010 lists about 80 fit combinations that meet most of the needs of any engineering task. You can choose from this list or define a custom combination in our Fit Calculator.(*) In North America, additional fit combinations are sometimes used per ANSI B4.1 & B4.2. You can find below the ISO charts also the ANSI Charts.Click the Fit Link (e.g. G7/h6 ➢) to get its detailed tolerances in both Inch and millimetersHole Basis Fits (ISO 286-1)fit_typeFitFit LevelPreferedc_idfit_sortFit typeLeveliH10/b9 ➢DGNC1Clearance Fit6.00iH11/b11 ➢DGYC1Clearance Fit6.00iH10/c9 ➢DGNC1Clearance Fit5.00iH11/c11 ➢DGYC1Clearance Fit5.00iH8/d8 ➢GRNC1Clearance Fit4.00iH9/d8 ➢GRNC1Clearance Fit4.00iH10/d9 ➢GRYC1Clearance Fit4.00iH11/d10 ➢GRNC1Clearance Fit4.00iH10/e9 ➢GRNC1Clearance Fit3.00iH9/e8 ➢GRYC1Clearance Fit3.00iH8/e8 ➢GRYC1Clearance Fit3.00iH8/e7 ➢GRNC1Clearance Fit3.00iH7/f6 ➢LGNC1Clearance Fit2.00iH9/f8 ➢LGNC1Clearance Fit2.00iH8/f8 ➢LGNC1Clearance Fit2.00iH8/f7 ➢LGYC1Clearance Fit2.00iH7/g6 ➢LGYC1Clearance Fit1.00iH6/g5 ➢LGNC1Clearance Fit1.00iH10/h9 ➢LGYC1Clearance Fit0.00iH11/h10 ➢LGNC1Clearance Fit0.00iH9/h8 ➢LGNC1Clearance Fit0.00iH8/h8 ➢LGNC1Clearance Fit0.00iH6/h5 ➢LGNC1Clearance Fit0.00iH7/h6 ➢LGYC1Clearance Fit0.00iH8/h7 ➢LGYC1Clearance Fit-1.00iH6/js5 ➢orNT2Transition Fit-1.00iH7/js6 ➢orYT2Transition Fit-1.00iH8/k7 ➢orNT2Transition Fit-3.00iH6/k5 ➢orNT2Transition Fit-3.00iH7/k6 ➢orYT2Transition Fit-3.00iH7/m6 ➢orNT2Transition Fit-5.00iH6/m5 ➢orNT2Transition Fit-5.00iH8/m7 ➢orNT2Transition Fit-5.00iH7/n6 ➢orYT2Transition Fit-6.00iH8/js7 ➢orNT2Transition Fit-11.00iH6/n5 ➢LRNI3Press Fit (Interference)-6.00iH7/p6 ➢LRYI3Press Fit (Interference)-8.00iH6/p5 ➢LRNI3Press Fit (Interference)-8.00iH7/r6 ➢LRYI3Press Fit (Interference)-10.00iH7/s6 ➢RDYI3Press Fit (Interference)-11.00iH8/s7 ➢RDNI3Press Fit (Interference)-11.00iH7/t6 ➢RDNI3Press Fit (Interference)-12.00iH7/u6 ➢DRNI3Press Fit (Interference)-13.00iH8/u7 ➢DRNI3Press Fit (Interference)-13.00iH7/x6 ➢DRNI3Press Fit (Interference)-16.00Shaft Basis Fits (ISO 286-1)fit_typeFitFit LevelPreferedc_idfit_sortFit typeLeveliH10/b9 ➢DGNC1Clearance Fit6.00iH11/b11 ➢DGYC1Clearance Fit6.00iH10/c9 ➢DGNC1Clearance Fit5.00iH11/c11 ➢DGYC1Clearance Fit5.00iH8/d8 ➢GRNC1Clearance Fit4.00iH9/d8 ➢GRNC1Clearance Fit4.00iH10/d9 ➢GRYC1Clearance Fit4.00iH11/d10 ➢GRNC1Clearance Fit4.00iH10/e9 ➢GRNC1Clearance Fit3.00iH9/e8 ➢GRYC1Clearance Fit3.00iH8/e8 ➢GRYC1Clearance Fit3.00iH8/e7 ➢GRNC1Clearance Fit3.00iH7/f6 ➢LGNC1Clearance Fit2.00iH9/f8 ➢LGNC1Clearance Fit2.00iH8/f8 ➢LGNC1Clearance Fit2.00iH8/f7 ➢LGYC1Clearance Fit2.00iH7/g6 ➢LGYC1Clearance Fit1.00iH6/g5 ➢LGNC1Clearance Fit1.00iH10/h9 ➢LGYC1Clearance Fit0.00iH11/h10 ➢LGNC1Clearance Fit0.00iH9/h8 ➢LGNC1Clearance Fit0.00iH8/h8 ➢LGNC1Clearance Fit0.00iH6/h5 ➢LGNC1Clearance Fit0.00iH7/h6 ➢LGYC1Clearance Fit0.00iH8/h7 ➢LGYC1Clearance Fit-1.00iH6/js5 ➢orNT2Transition Fit-1.00iH7/js6 ➢orYT2Transition Fit-1.00iH8/k7 ➢orNT2Transition Fit-3.00iH6/k5 ➢orNT2Transition Fit-3.00iH7/k6 ➢orYT2Transition Fit-3.00iH7/m6 ➢orNT2Transition Fit-5.00iH6/m5 ➢orNT2Transition Fit-5.00iH8/m7 ➢orNT2Transition Fit-5.00iH7/n6 ➢orYT2Transition Fit-6.00iH8/js7 ➢orNT2Transition Fit-11.00iH6/n5 ➢LRNI3Press Fit (Interference)-6.00iH7/p6 ➢LRYI3Press Fit (Interference)-8.00iH6/p5 ➢LRNI3Press Fit (Interference)-8.00iH7/r6 ➢LRYI3Press Fit (Interference)-10.00iH7/s6 ➢RDYI3Press Fit (Interference)-11.00iH8/s7 ➢RDNI3Press Fit (Interference)-11.00iH7/t6 ➢RDNI3Press Fit (Interference)-12.00iH7/u6 ➢DRNI3Press Fit (Interference)-13.00iH8/u7 ➢DRNI3Press Fit (Interference)-13.00iH7/x6 ➢DRNI3Press Fit (Interference)-16.00Fit Combinations Per ANSI B4.1The tolerance classes mentioned in ANSI B4.1 (e.g., h9, g6, etc.) have the same nomenclature as in ISO 286. It could lead a confusion since the ANSI standard also defines the fundamental deviations and the tolerance grade on its own. The ANSI tolerancing system is nearly the same as the ISO 286 but not identical. If you take the values from the standard ISO charts or use our Online Calculator, you should expect about 0.1-0.5 thous errors. wdt_IDFit NameTolerance Class CombinationFit Typeth1RC 1H5/g4Running or Slidining Fits52RC 2H6/g5Running or Slidining Fits63RC 3H7/f6Running or Slidining Fits74RC 4H8/f7Running or Slidining Fits85RC 5H8/e7Running or Slidining Fits86RC 6H9/e8Running or Slidining Fits97RC 7H9/d8Running or Slidining Fits98RC 8H10/c9Running or Slidining Fits109RC 9H11/sh1Running or Slidining Fits1110LC 1H6/h5Clearance Location Fits611LC 2H7/h6Clearance Location Fits712LC 3H8/h7Clearance Location Fits813LC 4H10/h9Clearance Location Fits1014LC 5H7/g6Clearance Location Fits715LC 6H9/f8Clearance Location Fits916LC 7H10/e9Clearance Location Fits1017LC 8H10/d9Clearance Location Fits1018LC 9H11/c10Clearance Location Fits1119LC 10H12/sh2Clearance Location Fits1220LC 11H13/sh3Clearance Location Fits1321LT 1H7/js6Transition Fits722LT 2H8/js7Transition Fits823LT 3H7/k6Transition Fits724LT 4H8/k7Transition Fits825LT 5H7/n6Transition Fits726LT 6H7/n7Transition Fits727LN 1H6/n5Interference Location Fits628LN 2H7/p6Interference Location Fits729LN 3H7/r6Interference Location Fits730FN 1H6/sh4Force or Shrink Fits631FN 2H7/s6Force or Shrink Fits732FN 3H7/t6Force or Shrink Fits733FN 4H7/u6Force or Shrink Fits734FN 5H8/x7Force or Shrink Fits8Fit Combinations Per ANSI B4.2The tolerance classes mentioned in ANSI B4.1 (e.g., h9, g6, etc.) have the same nomenclature as in ISO 286. It could lead a confusion since the ANSI standard also defines the fundamental deviations and the tolerance grade on its own. The ANSI tolerancing system is nearly the same as the ISO 286 but not identical. If you take the values from the standard ISO charts or use our Online Calculator, you should expect about 0.1-0.5 thous errors.ClassificationHole BasisShaft BasisDescriptionClearanceH11/c11C11/h11Loose running fit for wide commercial tolerances or allowances on external members.H9/d9D9/h9Free running fit not for use where accuracy is essential, but good for large temperature variations, high running speeds, or heavy journal pressures.H8/f7F8/h7Close running fit for running on accurate machines and for accurate location at moderate speeds and journal pressures.H7/g6G7/h6Sliding fit not intended to run freely, but to move and turn freely and locate accurately.H7/h6H7/h6Locational clearance fit provides snug fit for locating stationary parts; but can be freely assembled and disassembled.InterferenceH7/k6K7/h6Locational transition fit for accurate location, a compromise between clearance and interference.H7/n6N7/h6Locational transition fit for more accurate location where greater interference is permissible.TransitionH7/p6P7/h6Locational interference fit for parts requiring rigidity and alignment with prime accuracy of location but without special bore pressure requirements.H7/s6S7/h6Medium drive fit for ordinary steel parts or shrink fits on light sections, the tightest fit usable with cast iron.H7/u6U7/h6Force fit suitable for parts which can be highly stressed or for shrink fits where the heavy pressing forces required are impractical.Related Glossary Terms:Thou

All chemical elements and effects shown above is related in steel materials. So, if you are in the steel industry, you should same it.

Manganese also tends to increase the rate of carbon penetration during carburizing and acts as a mild deoxidizing agent. However when too high carbon and too high manganese accompany each other, embrittlement sets in. Manganese is capable to form Manganese Sulphide (MnS) with sulphur, which is beneficial to machining. At the same time, it counters the brittleness from sulphur and is beneficial to the surface finish of carbon steel.

Tolerances & Fits MenuTolerance & Fit CalculatorBore & Hole Tolerance SystemTerminologyNomenclatureChartsEngineering FitsFit TypesFit Charts

The shaft deviation is zero (meaning an h), and the hole deviation varies to create different fit levels. For example, D9/h9, G7/h6. This method should only be utilized when it offers clear economic benefits, such as in situations where it is required to assemble multiple parts with holes that have varying deviations onto a single shaft.Fits Standard Combinations ChartsFor ordinary engineering purposes, only a small number of the many (~150,000) possible fit combinations is required. ISO 286-1:2010 lists about 80 fit combinations that meet most of the needs of any engineering task. You can choose from this list or define a custom combination in our Fit Calculator.(*) In North America, additional fit combinations are sometimes used per ANSI B4.1 & B4.2. You can find below the ISO charts also the ANSI Charts.Click the Fit Link (e.g. G7/h6 ➢) to get its detailed tolerances in both Inch and millimetersHole Basis Fits (ISO 286-1)fit_typeFitFit LevelPreferedc_idfit_sortFit typeLeveliH10/b9 ➢DGNC1Clearance Fit6.00iH11/b11 ➢DGYC1Clearance Fit6.00iH10/c9 ➢DGNC1Clearance Fit5.00iH11/c11 ➢DGYC1Clearance Fit5.00iH8/d8 ➢GRNC1Clearance Fit4.00iH9/d8 ➢GRNC1Clearance Fit4.00iH10/d9 ➢GRYC1Clearance Fit4.00iH11/d10 ➢GRNC1Clearance Fit4.00iH10/e9 ➢GRNC1Clearance Fit3.00iH9/e8 ➢GRYC1Clearance Fit3.00iH8/e8 ➢GRYC1Clearance Fit3.00iH8/e7 ➢GRNC1Clearance Fit3.00iH7/f6 ➢LGNC1Clearance Fit2.00iH9/f8 ➢LGNC1Clearance Fit2.00iH8/f8 ➢LGNC1Clearance Fit2.00iH8/f7 ➢LGYC1Clearance Fit2.00iH7/g6 ➢LGYC1Clearance Fit1.00iH6/g5 ➢LGNC1Clearance Fit1.00iH10/h9 ➢LGYC1Clearance Fit0.00iH11/h10 ➢LGNC1Clearance Fit0.00iH9/h8 ➢LGNC1Clearance Fit0.00iH8/h8 ➢LGNC1Clearance Fit0.00iH6/h5 ➢LGNC1Clearance Fit0.00iH7/h6 ➢LGYC1Clearance Fit0.00iH8/h7 ➢LGYC1Clearance Fit-1.00iH6/js5 ➢orNT2Transition Fit-1.00iH7/js6 ➢orYT2Transition Fit-1.00iH8/k7 ➢orNT2Transition Fit-3.00iH6/k5 ➢orNT2Transition Fit-3.00iH7/k6 ➢orYT2Transition Fit-3.00iH7/m6 ➢orNT2Transition Fit-5.00iH6/m5 ➢orNT2Transition Fit-5.00iH8/m7 ➢orNT2Transition Fit-5.00iH7/n6 ➢orYT2Transition Fit-6.00iH8/js7 ➢orNT2Transition Fit-11.00iH6/n5 ➢LRNI3Press Fit (Interference)-6.00iH7/p6 ➢LRYI3Press Fit (Interference)-8.00iH6/p5 ➢LRNI3Press Fit (Interference)-8.00iH7/r6 ➢LRYI3Press Fit (Interference)-10.00iH7/s6 ➢RDYI3Press Fit (Interference)-11.00iH8/s7 ➢RDNI3Press Fit (Interference)-11.00iH7/t6 ➢RDNI3Press Fit (Interference)-12.00iH7/u6 ➢DRNI3Press Fit (Interference)-13.00iH8/u7 ➢DRNI3Press Fit (Interference)-13.00iH7/x6 ➢DRNI3Press Fit (Interference)-16.00Shaft Basis Fits (ISO 286-1)fit_typeFitFit LevelPreferedc_idfit_sortFit typeLeveliH10/b9 ➢DGNC1Clearance Fit6.00iH11/b11 ➢DGYC1Clearance Fit6.00iH10/c9 ➢DGNC1Clearance Fit5.00iH11/c11 ➢DGYC1Clearance Fit5.00iH8/d8 ➢GRNC1Clearance Fit4.00iH9/d8 ➢GRNC1Clearance Fit4.00iH10/d9 ➢GRYC1Clearance Fit4.00iH11/d10 ➢GRNC1Clearance Fit4.00iH10/e9 ➢GRNC1Clearance Fit3.00iH9/e8 ➢GRYC1Clearance Fit3.00iH8/e8 ➢GRYC1Clearance Fit3.00iH8/e7 ➢GRNC1Clearance Fit3.00iH7/f6 ➢LGNC1Clearance Fit2.00iH9/f8 ➢LGNC1Clearance Fit2.00iH8/f8 ➢LGNC1Clearance Fit2.00iH8/f7 ➢LGYC1Clearance Fit2.00iH7/g6 ➢LGYC1Clearance Fit1.00iH6/g5 ➢LGNC1Clearance Fit1.00iH10/h9 ➢LGYC1Clearance Fit0.00iH11/h10 ➢LGNC1Clearance Fit0.00iH9/h8 ➢LGNC1Clearance Fit0.00iH8/h8 ➢LGNC1Clearance Fit0.00iH6/h5 ➢LGNC1Clearance Fit0.00iH7/h6 ➢LGYC1Clearance Fit0.00iH8/h7 ➢LGYC1Clearance Fit-1.00iH6/js5 ➢orNT2Transition Fit-1.00iH7/js6 ➢orYT2Transition Fit-1.00iH8/k7 ➢orNT2Transition Fit-3.00iH6/k5 ➢orNT2Transition Fit-3.00iH7/k6 ➢orYT2Transition Fit-3.00iH7/m6 ➢orNT2Transition Fit-5.00iH6/m5 ➢orNT2Transition Fit-5.00iH8/m7 ➢orNT2Transition Fit-5.00iH7/n6 ➢orYT2Transition Fit-6.00iH8/js7 ➢orNT2Transition Fit-11.00iH6/n5 ➢LRNI3Press Fit (Interference)-6.00iH7/p6 ➢LRYI3Press Fit (Interference)-8.00iH6/p5 ➢LRNI3Press Fit (Interference)-8.00iH7/r6 ➢LRYI3Press Fit (Interference)-10.00iH7/s6 ➢RDYI3Press Fit (Interference)-11.00iH8/s7 ➢RDNI3Press Fit (Interference)-11.00iH7/t6 ➢RDNI3Press Fit (Interference)-12.00iH7/u6 ➢DRNI3Press Fit (Interference)-13.00iH8/u7 ➢DRNI3Press Fit (Interference)-13.00iH7/x6 ➢DRNI3Press Fit (Interference)-16.00Fit Combinations Per ANSI B4.1The tolerance classes mentioned in ANSI B4.1 (e.g., h9, g6, etc.) have the same nomenclature as in ISO 286. It could lead a confusion since the ANSI standard also defines the fundamental deviations and the tolerance grade on its own. The ANSI tolerancing system is nearly the same as the ISO 286 but not identical. If you take the values from the standard ISO charts or use our Online Calculator, you should expect about 0.1-0.5 thous errors. wdt_IDFit NameTolerance Class CombinationFit Typeth1RC 1H5/g4Running or Slidining Fits52RC 2H6/g5Running or Slidining Fits63RC 3H7/f6Running or Slidining Fits74RC 4H8/f7Running or Slidining Fits85RC 5H8/e7Running or Slidining Fits86RC 6H9/e8Running or Slidining Fits97RC 7H9/d8Running or Slidining Fits98RC 8H10/c9Running or Slidining Fits109RC 9H11/sh1Running or Slidining Fits1110LC 1H6/h5Clearance Location Fits611LC 2H7/h6Clearance Location Fits712LC 3H8/h7Clearance Location Fits813LC 4H10/h9Clearance Location Fits1014LC 5H7/g6Clearance Location Fits715LC 6H9/f8Clearance Location Fits916LC 7H10/e9Clearance Location Fits1017LC 8H10/d9Clearance Location Fits1018LC 9H11/c10Clearance Location Fits1119LC 10H12/sh2Clearance Location Fits1220LC 11H13/sh3Clearance Location Fits1321LT 1H7/js6Transition Fits722LT 2H8/js7Transition Fits823LT 3H7/k6Transition Fits724LT 4H8/k7Transition Fits825LT 5H7/n6Transition Fits726LT 6H7/n7Transition Fits727LN 1H6/n5Interference Location Fits628LN 2H7/p6Interference Location Fits729LN 3H7/r6Interference Location Fits730FN 1H6/sh4Force or Shrink Fits631FN 2H7/s6Force or Shrink Fits732FN 3H7/t6Force or Shrink Fits733FN 4H7/u6Force or Shrink Fits734FN 5H8/x7Force or Shrink Fits8Fit Combinations Per ANSI B4.2The tolerance classes mentioned in ANSI B4.1 (e.g., h9, g6, etc.) have the same nomenclature as in ISO 286. It could lead a confusion since the ANSI standard also defines the fundamental deviations and the tolerance grade on its own. The ANSI tolerancing system is nearly the same as the ISO 286 but not identical. If you take the values from the standard ISO charts or use our Online Calculator, you should expect about 0.1-0.5 thous errors.ClassificationHole BasisShaft BasisDescriptionClearanceH11/c11C11/h11Loose running fit for wide commercial tolerances or allowances on external members.H9/d9D9/h9Free running fit not for use where accuracy is essential, but good for large temperature variations, high running speeds, or heavy journal pressures.H8/f7F8/h7Close running fit for running on accurate machines and for accurate location at moderate speeds and journal pressures.H7/g6G7/h6Sliding fit not intended to run freely, but to move and turn freely and locate accurately.H7/h6H7/h6Locational clearance fit provides snug fit for locating stationary parts; but can be freely assembled and disassembled.InterferenceH7/k6K7/h6Locational transition fit for accurate location, a compromise between clearance and interference.H7/n6N7/h6Locational transition fit for more accurate location where greater interference is permissible.TransitionH7/p6P7/h6Locational interference fit for parts requiring rigidity and alignment with prime accuracy of location but without special bore pressure requirements.H7/s6S7/h6Medium drive fit for ordinary steel parts or shrink fits on light sections, the tightest fit usable with cast iron.H7/u6U7/h6Force fit suitable for parts which can be highly stressed or for shrink fits where the heavy pressing forces required are impractical.Related Glossary Terms:Thou

Click the Fit Link (e.g. G7/h6 ➢) to get its detailed tolerances in both Inch and millimetersHole Basis Fits (ISO 286-1)fit_typeFitFit LevelPreferedc_idfit_sortFit typeLeveliH10/b9 ➢DGNC1Clearance Fit6.00iH11/b11 ➢DGYC1Clearance Fit6.00iH10/c9 ➢DGNC1Clearance Fit5.00iH11/c11 ➢DGYC1Clearance Fit5.00iH8/d8 ➢GRNC1Clearance Fit4.00iH9/d8 ➢GRNC1Clearance Fit4.00iH10/d9 ➢GRYC1Clearance Fit4.00iH11/d10 ➢GRNC1Clearance Fit4.00iH10/e9 ➢GRNC1Clearance Fit3.00iH9/e8 ➢GRYC1Clearance Fit3.00iH8/e8 ➢GRYC1Clearance Fit3.00iH8/e7 ➢GRNC1Clearance Fit3.00iH7/f6 ➢LGNC1Clearance Fit2.00iH9/f8 ➢LGNC1Clearance Fit2.00iH8/f8 ➢LGNC1Clearance Fit2.00iH8/f7 ➢LGYC1Clearance Fit2.00iH7/g6 ➢LGYC1Clearance Fit1.00iH6/g5 ➢LGNC1Clearance Fit1.00iH10/h9 ➢LGYC1Clearance Fit0.00iH11/h10 ➢LGNC1Clearance Fit0.00iH9/h8 ➢LGNC1Clearance Fit0.00iH8/h8 ➢LGNC1Clearance Fit0.00iH6/h5 ➢LGNC1Clearance Fit0.00iH7/h6 ➢LGYC1Clearance Fit0.00iH8/h7 ➢LGYC1Clearance Fit-1.00iH6/js5 ➢orNT2Transition Fit-1.00iH7/js6 ➢orYT2Transition Fit-1.00iH8/k7 ➢orNT2Transition Fit-3.00iH6/k5 ➢orNT2Transition Fit-3.00iH7/k6 ➢orYT2Transition Fit-3.00iH7/m6 ➢orNT2Transition Fit-5.00iH6/m5 ➢orNT2Transition Fit-5.00iH8/m7 ➢orNT2Transition Fit-5.00iH7/n6 ➢orYT2Transition Fit-6.00iH8/js7 ➢orNT2Transition Fit-11.00iH6/n5 ➢LRNI3Press Fit (Interference)-6.00iH7/p6 ➢LRYI3Press Fit (Interference)-8.00iH6/p5 ➢LRNI3Press Fit (Interference)-8.00iH7/r6 ➢LRYI3Press Fit (Interference)-10.00iH7/s6 ➢RDYI3Press Fit (Interference)-11.00iH8/s7 ➢RDNI3Press Fit (Interference)-11.00iH7/t6 ➢RDNI3Press Fit (Interference)-12.00iH7/u6 ➢DRNI3Press Fit (Interference)-13.00iH8/u7 ➢DRNI3Press Fit (Interference)-13.00iH7/x6 ➢DRNI3Press Fit (Interference)-16.00Shaft Basis Fits (ISO 286-1)fit_typeFitFit LevelPreferedc_idfit_sortFit typeLeveliH10/b9 ➢DGNC1Clearance Fit6.00iH11/b11 ➢DGYC1Clearance Fit6.00iH10/c9 ➢DGNC1Clearance Fit5.00iH11/c11 ➢DGYC1Clearance Fit5.00iH8/d8 ➢GRNC1Clearance Fit4.00iH9/d8 ➢GRNC1Clearance Fit4.00iH10/d9 ➢GRYC1Clearance Fit4.00iH11/d10 ➢GRNC1Clearance Fit4.00iH10/e9 ➢GRNC1Clearance Fit3.00iH9/e8 ➢GRYC1Clearance Fit3.00iH8/e8 ➢GRYC1Clearance Fit3.00iH8/e7 ➢GRNC1Clearance Fit3.00iH7/f6 ➢LGNC1Clearance Fit2.00iH9/f8 ➢LGNC1Clearance Fit2.00iH8/f8 ➢LGNC1Clearance Fit2.00iH8/f7 ➢LGYC1Clearance Fit2.00iH7/g6 ➢LGYC1Clearance Fit1.00iH6/g5 ➢LGNC1Clearance Fit1.00iH10/h9 ➢LGYC1Clearance Fit0.00iH11/h10 ➢LGNC1Clearance Fit0.00iH9/h8 ➢LGNC1Clearance Fit0.00iH8/h8 ➢LGNC1Clearance Fit0.00iH6/h5 ➢LGNC1Clearance Fit0.00iH7/h6 ➢LGYC1Clearance Fit0.00iH8/h7 ➢LGYC1Clearance Fit-1.00iH6/js5 ➢orNT2Transition Fit-1.00iH7/js6 ➢orYT2Transition Fit-1.00iH8/k7 ➢orNT2Transition Fit-3.00iH6/k5 ➢orNT2Transition Fit-3.00iH7/k6 ➢orYT2Transition Fit-3.00iH7/m6 ➢orNT2Transition Fit-5.00iH6/m5 ➢orNT2Transition Fit-5.00iH8/m7 ➢orNT2Transition Fit-5.00iH7/n6 ➢orYT2Transition Fit-6.00iH8/js7 ➢orNT2Transition Fit-11.00iH6/n5 ➢LRNI3Press Fit (Interference)-6.00iH7/p6 ➢LRYI3Press Fit (Interference)-8.00iH6/p5 ➢LRNI3Press Fit (Interference)-8.00iH7/r6 ➢LRYI3Press Fit (Interference)-10.00iH7/s6 ➢RDYI3Press Fit (Interference)-11.00iH8/s7 ➢RDNI3Press Fit (Interference)-11.00iH7/t6 ➢RDNI3Press Fit (Interference)-12.00iH7/u6 ➢DRNI3Press Fit (Interference)-13.00iH8/u7 ➢DRNI3Press Fit (Interference)-13.00iH7/x6 ➢DRNI3Press Fit (Interference)-16.00Fit Combinations Per ANSI B4.1The tolerance classes mentioned in ANSI B4.1 (e.g., h9, g6, etc.) have the same nomenclature as in ISO 286. It could lead a confusion since the ANSI standard also defines the fundamental deviations and the tolerance grade on its own. The ANSI tolerancing system is nearly the same as the ISO 286 but not identical. If you take the values from the standard ISO charts or use our Online Calculator, you should expect about 0.1-0.5 thous errors. wdt_IDFit NameTolerance Class CombinationFit Typeth1RC 1H5/g4Running or Slidining Fits52RC 2H6/g5Running or Slidining Fits63RC 3H7/f6Running or Slidining Fits74RC 4H8/f7Running or Slidining Fits85RC 5H8/e7Running or Slidining Fits86RC 6H9/e8Running or Slidining Fits97RC 7H9/d8Running or Slidining Fits98RC 8H10/c9Running or Slidining Fits109RC 9H11/sh1Running or Slidining Fits1110LC 1H6/h5Clearance Location Fits611LC 2H7/h6Clearance Location Fits712LC 3H8/h7Clearance Location Fits813LC 4H10/h9Clearance Location Fits1014LC 5H7/g6Clearance Location Fits715LC 6H9/f8Clearance Location Fits916LC 7H10/e9Clearance Location Fits1017LC 8H10/d9Clearance Location Fits1018LC 9H11/c10Clearance Location Fits1119LC 10H12/sh2Clearance Location Fits1220LC 11H13/sh3Clearance Location Fits1321LT 1H7/js6Transition Fits722LT 2H8/js7Transition Fits823LT 3H7/k6Transition Fits724LT 4H8/k7Transition Fits825LT 5H7/n6Transition Fits726LT 6H7/n7Transition Fits727LN 1H6/n5Interference Location Fits628LN 2H7/p6Interference Location Fits729LN 3H7/r6Interference Location Fits730FN 1H6/sh4Force or Shrink Fits631FN 2H7/s6Force or Shrink Fits732FN 3H7/t6Force or Shrink Fits733FN 4H7/u6Force or Shrink Fits734FN 5H8/x7Force or Shrink Fits8Fit Combinations Per ANSI B4.2The tolerance classes mentioned in ANSI B4.1 (e.g., h9, g6, etc.) have the same nomenclature as in ISO 286. It could lead a confusion since the ANSI standard also defines the fundamental deviations and the tolerance grade on its own. The ANSI tolerancing system is nearly the same as the ISO 286 but not identical. If you take the values from the standard ISO charts or use our Online Calculator, you should expect about 0.1-0.5 thous errors.ClassificationHole BasisShaft BasisDescriptionClearanceH11/c11C11/h11Loose running fit for wide commercial tolerances or allowances on external members.H9/d9D9/h9Free running fit not for use where accuracy is essential, but good for large temperature variations, high running speeds, or heavy journal pressures.H8/f7F8/h7Close running fit for running on accurate machines and for accurate location at moderate speeds and journal pressures.H7/g6G7/h6Sliding fit not intended to run freely, but to move and turn freely and locate accurately.H7/h6H7/h6Locational clearance fit provides snug fit for locating stationary parts; but can be freely assembled and disassembled.InterferenceH7/k6K7/h6Locational transition fit for accurate location, a compromise between clearance and interference.H7/n6N7/h6Locational transition fit for more accurate location where greater interference is permissible.TransitionH7/p6P7/h6Locational interference fit for parts requiring rigidity and alignment with prime accuracy of location but without special bore pressure requirements.H7/s6S7/h6Medium drive fit for ordinary steel parts or shrink fits on light sections, the tightest fit usable with cast iron.H7/u6U7/h6Force fit suitable for parts which can be highly stressed or for shrink fits where the heavy pressing forces required are impractical.Related Glossary Terms:Thou

Typically not desirable in cutlery steel. Added to improve machinability. Similar with Sulfur, in the same chalcogen group.

Nickel is often used in combination with other alloying elements, especially chromium and molybdenum. It is a key component in stainless steels but at the low concentrations found in carbon steels. Stainless steels contain between 8% and 14% nickel.

Nickel is a silvery-white, brilliant metallic element that occurs naturally. It is the sixth most prevalent element on the planet and is abundant in the crust ...

(*) Click to enlargeNomenclatureStandard Tolerance GradesThe standard tolerance grades are designated by the letters IT followed by a number, for example, IT7. When the tolerance grade is associated with a fundamental deviation symbol to form a tolerance class, the letters IT are omitted (e.g., h7, JS5)Fundamental DeviationA 1-2 letter code represents the fundamental deviation. Upper case (e.g., G, JS) designates hole deviations, while lower case (e.g., g, js) designates shaft deviations.Tolerance ClassThe tolerance class is designated by the letter(s) representing the fundamental deviation followed by the standard tolerance grade number. For example, a shaft with a deviation of g and a tolerance grade of T11 will be denoted as g11. A hole with a deviation of JS and a tolerance grade of IT7 will be represented as JS7.Tolerance SizeThe tolerance size combines the basic size with the tolerance class, designated by the basic size, followedby the designation of the required tolerance class (without spaces). For example, 32H7 specifies a hole with a nominal size of 32 mm, deviation H, and tolerance grade of IT7.Tolerances ChartsStandard Tolerance Grades (IT) ChartTolerance Dimensions in MicronsTo convert to millimeters, divide by 1000To convert to Thous, divide by 25.4 wdt_IDDiameter Range (mm)(Inches)IT01IT0IT1IT2IT3IT4IT5IT6IT7IT8IT9IT10IT11IT12IT13IT14IT15IT16IT17IT1810 - 30 - 0.120.30.50.81.2234610142540601001402504006001000140023 - 60.12 - 0.240.40.611.52.545812183048751201803004807501200180036 - 100.24 - 0.40.40.611.52.5469152236589015022036058090015002200410 - 180.4 - 0.710.50.81.223581118274370110180270430700110018002700518 - 300.71 - 1.190.611.52.54691321335284130210330520840130021003300630 - 501.19 - 1.970.611.52.54711162539621001602503906201000160025003900750 - 801.97 - 3.150.81.2235813193046741201903004607401200190030004600880 - 1203.15 - 4.7311.52.54610152235548714022035054087014002200350054009120 - 1804.73 - 7.091.223.55812182540631001602504006301000160025004000630010180 - 2507.09 - 9.85234.571014202946721151852904607201150185029004600720011250 - 3159.85 - 12.412.54681216233252811302103205208101300210032005200810012315 - 40012.41 - 15.7535791318253657891402303605708901400230036005700890013400 - 50015.75 - 19.7468101520274063971552504006309701550250040006300970014500 - 63019.7 - 24.84.569111622324470110175280440700110017502800440070001100015630 - 80024.8 - 31.55710131825365080125200320500800125020003200500080001250016800 - 100031.5 - 39.45.58111521284056901402303605609001400230036005600900014000171000 - 125039.4 - 49.26.59131824334766105165260420660105016502600420066001050016500181250 - 160049.2 - 63811152129395578125195310500780125019503100500078001250019500191600 - 200063 - 78.7913182535466592150230370600920150023003700600092001500023000202000 - 250078.7 - 98.4111522304155781101752804407001100175028004400700011001750028000212500 - 315098.4 - 1241318263650689613521033054086013502100330054008600135002100033000Fundamental deviation of holes ChartClick the Tolerance Link (e.g., H ➢) to get the Full & Accurate charts for a specific deviation in Inch and Metric unitsClick  icons to show all columns for the entire diameter range (0-3,150 mm)The deviations of J through Z also depend on the IT Therefore, the values in the below table are only accurate in some cases. To get the correct value in all cases, click the Tolerance Link (e.g., H ➢).Dimentions in Microns. To convert to millimeters, divide by 1000, to Thous, divide by 25.4 Deviationidurl0 - 3 mm3 - 6 mm6 - 1010 - 1414 - 1818 - 2424 - 3030 - 4040 - 5050 - 6565 - 8080 - 100100 - 120120 - 140140 - 160160 - 180180 - 200200 - 225225 - 250250 - 280280 - 315315 - 355355 - 400400 - 450450 - 500500 - 560560 - 630630 - 710710 - 800800 - 900900 - 10001000 - 11201120 - 12501250 - 14001400 - 16001600 - 18001800 - 20002000 - 22402240 - 25002500 - 28002800 - 3150A ➢1calculators/tolerances/tol?dev=a||A ➢27027028029029030030031032034036038041046052058066074082092010501200135015001650XXXXXXXXXXXXXXXXB ➢2calculators/tolerances/tol?dev=b||B ➢140140150150150160160170180190200220240260280310340380420480540600680760840XXXXXXXXXXXXXXXXC ➢3calculators/tolerances/tol?dev=c||C ➢6070809595110110120130140150170180200210230240260280300330360400440480520580640700780860940105011501300145016001800200022002500CD ➢4calculators/tolerances/tol?dev=cd||CD ➢344656XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXD ➢5calculators/tolerances/tol?dev=d||D ➢203040505065658080100100120120145145145170170170190190210210230230260260290290320320350350390390430430480480520520E ➢6calculators/tolerances/tol?dev=e||E ➢14202532324040505060607272858585100100100110110125125135135145145160160170170195195220220240240260260290290EF ➢7calculators/tolerances/tol?dev=ef||EF ➢101418XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXF ➢8calculators/tolerances/tol?dev=f||F ➢61013161620202525303036364343435050505656626268687676808086869898110110120120130130145145FG ➢9calculators/tolerances/tol?dev=fg||FG ➢468XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXG ➢10calculators/tolerances/tol?dev=g||G ➢2456677991010121214141415151517171818202022222424262628283030323234343838H ➢11calculators/tolerances/tol?dev=h||H ➢00000000000000000000000000000000000000000JS ➢12calculators/tolerances/tol?dev=js||JS ➢00000000000000000000000000000000000000000J ➢13calculators/tolerances/tol?dev=j||J ➢46810101212141418182222262626303030363639394343XXXXXXXXXXXXXXXXK ➢14calculators/tolerances/tol?dev=k||K ➢0-1-1-1-1-2-2-2-2-2-2-3-3-3-3-3-4-4-4-4-4-4-4-5-50000000000000000M ➢15calculators/tolerances/tol?dev=m||M ➢-2-4-6-7-7-8-8-9-9-11-11-13-13-15-15-15-17-17-17-20-20-21-21-23-23-26-26-30-30-34-34-40-40-48-48-58-58-68-68-76-76N ➢16calculators/tolerances/tol?dev=n||N ➢-4-8-10-12-12-15-15-17-17-20-20-23-23-27-27-27-31-31-31-34-34-37-37-40-40-44-44-50-50-56-56-66-66-78-78-92-92-110-110-135-135P ➢17calculators/tolerances/tol?dev=p||P ➢-6-12-15-18-18-22-22-26-26-32-32-37-37-43-43-43-50-50-50-56-56-62-62-68-68-78-78-88-88-100-100-120-120-140-140-170-170-195-195-240-240R ➢18calculators/tolerances/tol?dev=r||R ➢-10-15-19-23-23-28-28-34-34-41-43-51-54-63-65-68-77-80-84-94-98-108-114-126-132-150-155-175-185-210-220-250-260-300-330-370-400-440-460-550-580S ➢19calculators/tolerances/tol?dev=s||S ➢-14-19-23-28-28-35-35-43-43-53-59-71-79-92-100-108-122-130-140-158-170-190-208-232-252-280-310-340-380-430-470-520-580-640-720-820-920-1000-1100-1250-1400T ➢20calculators/tolerances/tol?dev=t||T ➢000XXX-41-48-54-66-75-91-104-122-134-146-166-180-196-218-240-268-294-330-360-400-450-500-560-620-680-780-840-960-1050-1200-1350-1500-1650-1900-2100U ➢21calculators/tolerances/tol?dev=u||U ➢-18-23-28-33-33-41-48-60-70-87-102-124-144-170-190-210-236-258-284-315-350-390-435-490-540-600-660-740-840-940-1050-1150-1300-1450-1600-1850-2000-2300-2500-2900-3200V ➢22calculators/tolerances/tol?dev=v||V ➢000X-39-47-55-68-81-102-120-146-172-202-228-252-284-310-340-385-425-475-530-595-660-740-820-920-1000-1150-1300-1450-1600-1800-2000-2300-2500-2800-3100-3500-3900X ➢23calculators/tolerances/tol?dev=x||X ➢-20-28-34-40-45-54-64-80-97-122-146-178-210-248-280-310-340-385-425-475-525-590-660-740-820XXXXXXXXXXXXXXXXY ➢24calculators/tolerances/tol?dev=y||Y ➢000XX-63-75-94-114-144-174-214-254-300-340-380-425-470-520-580-650-730-820-920-1000XXXXXXXXXXXXXXXXZ ➢25calculators/tolerances/tol?dev=z||Z ➢-26-35-42-50-60-73-88-112-136-172-210-258-310-365-415-465-520-575-640-710-790-900-1000-1100-1250XXXXXXXXXXXXXXXXZA ➢26calculators/tolerances/tol?dev=za||ZA ➢-32-42-52-64-77-98-118-148-180-226-274-335-400-470-535-600-670-740-820-920-1000-1150-1300-1450-1600XXXXXXXXXXXXXXXXFundamental deviation of shafts ChartClick the Tolerance Link (e.g., g ➢) to get the Full & Accurate charts for a specific deviation in Inch and Metric unitsClick  icons to show all columns of the entire diameter range (0-3,150 mm)The deviations of J through Z also depend on the IT Therefore, the values in the below table are only accurate in some cases. To get the correct value in all cases, click the Tolerance Link (e.g., g ➢).Dimentions in Microns. To convert to millimeters, divide by 1000, to Thous, divide by 25.4 Deviationidurl0 - 3 mm3 - 6 mm6 - 1010 - 1414 - 1818 - 2424 - 3030 - 4040 - 5050 - 6565 - 8080 - 100100 - 120120 - 140140 - 160160 - 180180 - 200200 - 225225 - 250250 - 280280 - 315315 - 355355 - 400400 - 450450 - 500500 - 560560 - 630630 - 710710 - 800800 - 900900 - 10001000 - 11201120 - 12501250 - 14001400 - 16001600 - 18001800 - 20002000 - 22402240 - 25002500 - 28002800 - 3150a ➢1calculators/tolerances/tol?dev=a||A ➢-270-270-280-290-290-300-300-310-320-340-360-380-410-460-520-580-660-740-820-920-1050-1200-1350-1500-1650XXXXXXXXXXXXXXXXb ➢2calculators/tolerances/tol?dev=b||B ➢-140-140-150-150-150-160-160-170-180-190-200-220-240-260-280-310-340-380-420-480-540-600-680-760-840XXXXXXXXXXXXXXXXc ➢3calculators/tolerances/tol?dev=c||C ➢-60-70-80-95-95-110-110-120-130-140-150-170-180-200-210-230-240-260-280-300-330-360-400-440-480-520-580-640-700-780-860-940-1050-1150-1300-1450-1600-1800-2000-2200-2500cd ➢4calculators/tolerances/tol?dev=cd||CD ➢-34-46-56XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXd ➢5calculators/tolerances/tol?dev=d||D ➢-20-30-40-50-50-65-65-80-80-100-100-120-120-145-145-145-170-170-170-190-190-210-210-230-230-260-260-290-290-320-320-350-350-390-390-430-430-480-480-520-520e ➢6calculators/tolerances/tol?dev=e||E ➢-14-20-25-32-32-40-40-50-50-60-60-72-72-85-85-85-100-100-100-110-110-125-125-135-135-145-145-160-160-170-170-195-195-220-220-240-240-260-260-290-290ef ➢7calculators/tolerances/tol?dev=ef||EF ➢-10-14-18XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXf ➢8calculators/tolerances/tol?dev=f||F ➢-6-10-13-16-16-20-20-25-25-30-30-36-36-43-43-43-50-50-50-56-56-62-62-68-68-76-76-80-80-86-86-98-98-110-110-120-120-130-130-145-145fg ➢9calculators/tolerances/tol?dev=fg||FG ➢-4-6-8XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXg ➢10calculators/tolerances/tol?dev=g||G ➢-2-4-5-6-6-7-7-9-9-10-10-12-12-14-14-14-15-15-15-17-17-18-18-20-20-22-22-24-24-26-26-28-28-30-30-32-32-34-34-38-38h ➢11calculators/tolerances/tol?dev=h||H ➢00000000000000000000000000000000000000000js ➢12calculators/tolerances/tol?dev=js||JS ➢00000000000000000000000000000000000000000j ➢13calculators/tolerances/tol?dev=j||J ➢-4-6-8-10-10-12-12-14-14-18-18-22-22-26-26-26-30-30-30-36-36-39-39-43-43XXXXXXXXXXXXXXXXk ➢14calculators/tolerances/tol?dev=k||K ➢01111222222333334444444550000000000000000m ➢15calculators/tolerances/tol?dev=m||M ➢2467788991111131315151517171720202121232326263030343440404848585868687676n ➢16calculators/tolerances/tol?dev=n||N ➢481012121515171720202323272727313131343437374040444450505656666678789292110110135135p ➢17calculators/tolerances/tol?dev=p||P ➢612151818222226263232373743434350505056566262686878788888100100120120140140170170195195240240r ➢18calculators/tolerances/tol?dev=r||R ➢101519232328283434414351546365687780849498108114126132150155175185210220250260300330370400440460550580s ➢19calculators/tolerances/tol?dev=s||S ➢14192328283535434353597179921001081221301401581701902082322522803103403804304705205806407208209201000110012501400t ➢20calculators/tolerances/tol?dev=t||T ➢000XXX4148546675911041221341461661801962182402682943303604004505005606206807808409601050120013501500165019002100u ➢21calculators/tolerances/tol?dev=u||U ➢1823283333414860708710212414417019021023625828431535039043549054060066074084094010501150130014501600185020002300250029003200v ➢22calculators/tolerances/tol?dev=v||V ➢000X39475568811021201461722022282522843103403854254755305956607408209201000115013001450160018002000230025002800310035003900x ➢23calculators/tolerances/tol?dev=x||X ➢202834404554648097122146178210248280310340385425475525590660740820XXXXXXXXXXXXXXXXy ➢24calculators/tolerances/tol?dev=y||Y ➢000XX6375941141441742142543003403804254705205806507308209201000XXXXXXXXXXXXXXXXz ➢25calculators/tolerances/tol?dev=z||Z ➢26354250607388112136172210258310365415465520575640710790900100011001250XXXXXXXXXXXXXXXXza ➢26calculators/tolerances/tol?dev=za||ZA ➢32425264779811814818022627433540047053560067074082092010001150130014501600XXXXXXXXXXXXXXXXEngineering FitsEngineering fit refers to the degree of tightness or looseness between two mating parts in an assembly. It is defined by combining a hole with a tolerance class and a shaft with a tolerance class. (See definition of terms above).Several standards define recommended pairings for different applications. The values presented in our charts and Calculator are based on ISO 286-1:2010 (In earlier revisions, it was separated into ISO 1829, which is now obsolete). In North America, additional fit combinations are sometimes used per ANSI B4.1 & B4.2. The ANSI tolerancing system is nearly equivalent to ISO 286 but not identical. The difference is typically 0.1-0.5 thous.Main Fit TypesClearance FitA clearance fit is a type in which the shaft is smaller than the hole it is inserted into, allowing for free movement, assembly, and disassembly. Clearance fits can range from loose-running for assemblies that need a significant gap for free movement or to accommodate temperature variation to locational clearance for stationary parts that need to be freely assembled/disassembled but still maintain accuracy.Transition FitA transition fit is a type in which the shaft may be slightly smaller or larger than the hole (before assembly). It is used to create a tight and secure connection between them in applications requiring high precision and stability. It provides high accuracy, but the connecting parts can be disassembled and reassembled without damage. However, force cannot be transmitted.Press Fit (Interference)An interference (Press) fit is a type in which the shaft is larger than the hole (before assembly). It creates a frictional force that holds the parts together without the need for additional fasteners or adhesives. The interference fit is commonly used in mechanical engineering to create solid and reliable connections between components that need to withstand heavy loads or vibrations. However, It is hard to disassemble without damaging the parts. Some degree of force can be transmitted between the components.Fits are also divided into two types of “basis”There are no technical differences between the two basis. Therefore the choice of the system should be based on economic reasons.Hole Basis FitsThe hole deviation is zero (meaning an H), and the shaft deviation varies to create different fit levels. For example, H9/d8 , H7/g6. It is the first choice of combinations for general use, since it avoids an unnecessary multiplicity of tools (e.g., reamers) and gaugesShaft Basis FitsThe shaft deviation is zero (meaning an h), and the hole deviation varies to create different fit levels. For example, D9/h9, G7/h6. This method should only be utilized when it offers clear economic benefits, such as in situations where it is required to assemble multiple parts with holes that have varying deviations onto a single shaft.Fits Standard Combinations ChartsFor ordinary engineering purposes, only a small number of the many (~150,000) possible fit combinations is required. ISO 286-1:2010 lists about 80 fit combinations that meet most of the needs of any engineering task. You can choose from this list or define a custom combination in our Fit Calculator.(*) In North America, additional fit combinations are sometimes used per ANSI B4.1 & B4.2. You can find below the ISO charts also the ANSI Charts.Click the Fit Link (e.g. G7/h6 ➢) to get its detailed tolerances in both Inch and millimetersHole Basis Fits (ISO 286-1)fit_typeFitFit LevelPreferedc_idfit_sortFit typeLeveliH10/b9 ➢DGNC1Clearance Fit6.00iH11/b11 ➢DGYC1Clearance Fit6.00iH10/c9 ➢DGNC1Clearance Fit5.00iH11/c11 ➢DGYC1Clearance Fit5.00iH8/d8 ➢GRNC1Clearance Fit4.00iH9/d8 ➢GRNC1Clearance Fit4.00iH10/d9 ➢GRYC1Clearance Fit4.00iH11/d10 ➢GRNC1Clearance Fit4.00iH10/e9 ➢GRNC1Clearance Fit3.00iH9/e8 ➢GRYC1Clearance Fit3.00iH8/e8 ➢GRYC1Clearance Fit3.00iH8/e7 ➢GRNC1Clearance Fit3.00iH7/f6 ➢LGNC1Clearance Fit2.00iH9/f8 ➢LGNC1Clearance Fit2.00iH8/f8 ➢LGNC1Clearance Fit2.00iH8/f7 ➢LGYC1Clearance Fit2.00iH7/g6 ➢LGYC1Clearance Fit1.00iH6/g5 ➢LGNC1Clearance Fit1.00iH10/h9 ➢LGYC1Clearance Fit0.00iH11/h10 ➢LGNC1Clearance Fit0.00iH9/h8 ➢LGNC1Clearance Fit0.00iH8/h8 ➢LGNC1Clearance Fit0.00iH6/h5 ➢LGNC1Clearance Fit0.00iH7/h6 ➢LGYC1Clearance Fit0.00iH8/h7 ➢LGYC1Clearance Fit-1.00iH6/js5 ➢orNT2Transition Fit-1.00iH7/js6 ➢orYT2Transition Fit-1.00iH8/k7 ➢orNT2Transition Fit-3.00iH6/k5 ➢orNT2Transition Fit-3.00iH7/k6 ➢orYT2Transition Fit-3.00iH7/m6 ➢orNT2Transition Fit-5.00iH6/m5 ➢orNT2Transition Fit-5.00iH8/m7 ➢orNT2Transition Fit-5.00iH7/n6 ➢orYT2Transition Fit-6.00iH8/js7 ➢orNT2Transition Fit-11.00iH6/n5 ➢LRNI3Press Fit (Interference)-6.00iH7/p6 ➢LRYI3Press Fit (Interference)-8.00iH6/p5 ➢LRNI3Press Fit (Interference)-8.00iH7/r6 ➢LRYI3Press Fit (Interference)-10.00iH7/s6 ➢RDYI3Press Fit (Interference)-11.00iH8/s7 ➢RDNI3Press Fit (Interference)-11.00iH7/t6 ➢RDNI3Press Fit (Interference)-12.00iH7/u6 ➢DRNI3Press Fit (Interference)-13.00iH8/u7 ➢DRNI3Press Fit (Interference)-13.00iH7/x6 ➢DRNI3Press Fit (Interference)-16.00Shaft Basis Fits (ISO 286-1)fit_typeFitFit LevelPreferedc_idfit_sortFit typeLeveliH10/b9 ➢DGNC1Clearance Fit6.00iH11/b11 ➢DGYC1Clearance Fit6.00iH10/c9 ➢DGNC1Clearance Fit5.00iH11/c11 ➢DGYC1Clearance Fit5.00iH8/d8 ➢GRNC1Clearance Fit4.00iH9/d8 ➢GRNC1Clearance Fit4.00iH10/d9 ➢GRYC1Clearance Fit4.00iH11/d10 ➢GRNC1Clearance Fit4.00iH10/e9 ➢GRNC1Clearance Fit3.00iH9/e8 ➢GRYC1Clearance Fit3.00iH8/e8 ➢GRYC1Clearance Fit3.00iH8/e7 ➢GRNC1Clearance Fit3.00iH7/f6 ➢LGNC1Clearance Fit2.00iH9/f8 ➢LGNC1Clearance Fit2.00iH8/f8 ➢LGNC1Clearance Fit2.00iH8/f7 ➢LGYC1Clearance Fit2.00iH7/g6 ➢LGYC1Clearance Fit1.00iH6/g5 ➢LGNC1Clearance Fit1.00iH10/h9 ➢LGYC1Clearance Fit0.00iH11/h10 ➢LGNC1Clearance Fit0.00iH9/h8 ➢LGNC1Clearance Fit0.00iH8/h8 ➢LGNC1Clearance Fit0.00iH6/h5 ➢LGNC1Clearance Fit0.00iH7/h6 ➢LGYC1Clearance Fit0.00iH8/h7 ➢LGYC1Clearance Fit-1.00iH6/js5 ➢orNT2Transition Fit-1.00iH7/js6 ➢orYT2Transition Fit-1.00iH8/k7 ➢orNT2Transition Fit-3.00iH6/k5 ➢orNT2Transition Fit-3.00iH7/k6 ➢orYT2Transition Fit-3.00iH7/m6 ➢orNT2Transition Fit-5.00iH6/m5 ➢orNT2Transition Fit-5.00iH8/m7 ➢orNT2Transition Fit-5.00iH7/n6 ➢orYT2Transition Fit-6.00iH8/js7 ➢orNT2Transition Fit-11.00iH6/n5 ➢LRNI3Press Fit (Interference)-6.00iH7/p6 ➢LRYI3Press Fit (Interference)-8.00iH6/p5 ➢LRNI3Press Fit (Interference)-8.00iH7/r6 ➢LRYI3Press Fit (Interference)-10.00iH7/s6 ➢RDYI3Press Fit (Interference)-11.00iH8/s7 ➢RDNI3Press Fit (Interference)-11.00iH7/t6 ➢RDNI3Press Fit (Interference)-12.00iH7/u6 ➢DRNI3Press Fit (Interference)-13.00iH8/u7 ➢DRNI3Press Fit (Interference)-13.00iH7/x6 ➢DRNI3Press Fit (Interference)-16.00Fit Combinations Per ANSI B4.1The tolerance classes mentioned in ANSI B4.1 (e.g., h9, g6, etc.) have the same nomenclature as in ISO 286. It could lead a confusion since the ANSI standard also defines the fundamental deviations and the tolerance grade on its own. The ANSI tolerancing system is nearly the same as the ISO 286 but not identical. If you take the values from the standard ISO charts or use our Online Calculator, you should expect about 0.1-0.5 thous errors. wdt_IDFit NameTolerance Class CombinationFit Typeth1RC 1H5/g4Running or Slidining Fits52RC 2H6/g5Running or Slidining Fits63RC 3H7/f6Running or Slidining Fits74RC 4H8/f7Running or Slidining Fits85RC 5H8/e7Running or Slidining Fits86RC 6H9/e8Running or Slidining Fits97RC 7H9/d8Running or Slidining Fits98RC 8H10/c9Running or Slidining Fits109RC 9H11/sh1Running or Slidining Fits1110LC 1H6/h5Clearance Location Fits611LC 2H7/h6Clearance Location Fits712LC 3H8/h7Clearance Location Fits813LC 4H10/h9Clearance Location Fits1014LC 5H7/g6Clearance Location Fits715LC 6H9/f8Clearance Location Fits916LC 7H10/e9Clearance Location Fits1017LC 8H10/d9Clearance Location Fits1018LC 9H11/c10Clearance Location Fits1119LC 10H12/sh2Clearance Location Fits1220LC 11H13/sh3Clearance Location Fits1321LT 1H7/js6Transition Fits722LT 2H8/js7Transition Fits823LT 3H7/k6Transition Fits724LT 4H8/k7Transition Fits825LT 5H7/n6Transition Fits726LT 6H7/n7Transition Fits727LN 1H6/n5Interference Location Fits628LN 2H7/p6Interference Location Fits729LN 3H7/r6Interference Location Fits730FN 1H6/sh4Force or Shrink Fits631FN 2H7/s6Force or Shrink Fits732FN 3H7/t6Force or Shrink Fits733FN 4H7/u6Force or Shrink Fits734FN 5H8/x7Force or Shrink Fits8Fit Combinations Per ANSI B4.2The tolerance classes mentioned in ANSI B4.1 (e.g., h9, g6, etc.) have the same nomenclature as in ISO 286. It could lead a confusion since the ANSI standard also defines the fundamental deviations and the tolerance grade on its own. The ANSI tolerancing system is nearly the same as the ISO 286 but not identical. If you take the values from the standard ISO charts or use our Online Calculator, you should expect about 0.1-0.5 thous errors.ClassificationHole BasisShaft BasisDescriptionClearanceH11/c11C11/h11Loose running fit for wide commercial tolerances or allowances on external members.H9/d9D9/h9Free running fit not for use where accuracy is essential, but good for large temperature variations, high running speeds, or heavy journal pressures.H8/f7F8/h7Close running fit for running on accurate machines and for accurate location at moderate speeds and journal pressures.H7/g6G7/h6Sliding fit not intended to run freely, but to move and turn freely and locate accurately.H7/h6H7/h6Locational clearance fit provides snug fit for locating stationary parts; but can be freely assembled and disassembled.InterferenceH7/k6K7/h6Locational transition fit for accurate location, a compromise between clearance and interference.H7/n6N7/h6Locational transition fit for more accurate location where greater interference is permissible.TransitionH7/p6P7/h6Locational interference fit for parts requiring rigidity and alignment with prime accuracy of location but without special bore pressure requirements.H7/s6S7/h6Medium drive fit for ordinary steel parts or shrink fits on light sections, the tightest fit usable with cast iron.H7/u6U7/h6Force fit suitable for parts which can be highly stressed or for shrink fits where the heavy pressing forces required are impractical.Related Glossary Terms:Thou

Nitrogen acts very similar to Carbon in the alloy. N substitutes C in small amounts (or even large, with modern technologies) to increase hardness. Obviously, Nitrogen forms Nitrides, not Carbides. INFI has N, and there’s few more, with Sandvik being the champion, having 3% N in the alloy, completely substituting C. Sadly, not available for knife makers. Because Nitrogen is less prone to form Chromium nitrides than Carbon is to form Chromium carbides, its presence improves corrosion resistance, leaving more free Chromium in the alloy. Since Nitrogen is less reactive in forming Nitrides, it can be used for added hardness without increasing carbide size and volume, e.g. Sandvik 14C28N steel.

Fits are also divided into two types of “basis”There are no technical differences between the two basis. Therefore the choice of the system should be based on economic reasons.Hole Basis FitsThe hole deviation is zero (meaning an H), and the shaft deviation varies to create different fit levels. For example, H9/d8 , H7/g6. It is the first choice of combinations for general use, since it avoids an unnecessary multiplicity of tools (e.g., reamers) and gaugesShaft Basis FitsThe shaft deviation is zero (meaning an h), and the hole deviation varies to create different fit levels. For example, D9/h9, G7/h6. This method should only be utilized when it offers clear economic benefits, such as in situations where it is required to assemble multiple parts with holes that have varying deviations onto a single shaft.Fits Standard Combinations ChartsFor ordinary engineering purposes, only a small number of the many (~150,000) possible fit combinations is required. ISO 286-1:2010 lists about 80 fit combinations that meet most of the needs of any engineering task. You can choose from this list or define a custom combination in our Fit Calculator.(*) In North America, additional fit combinations are sometimes used per ANSI B4.1 & B4.2. You can find below the ISO charts also the ANSI Charts.Click the Fit Link (e.g. G7/h6 ➢) to get its detailed tolerances in both Inch and millimetersHole Basis Fits (ISO 286-1)fit_typeFitFit LevelPreferedc_idfit_sortFit typeLeveliH10/b9 ➢DGNC1Clearance Fit6.00iH11/b11 ➢DGYC1Clearance Fit6.00iH10/c9 ➢DGNC1Clearance Fit5.00iH11/c11 ➢DGYC1Clearance Fit5.00iH8/d8 ➢GRNC1Clearance Fit4.00iH9/d8 ➢GRNC1Clearance Fit4.00iH10/d9 ➢GRYC1Clearance Fit4.00iH11/d10 ➢GRNC1Clearance Fit4.00iH10/e9 ➢GRNC1Clearance Fit3.00iH9/e8 ➢GRYC1Clearance Fit3.00iH8/e8 ➢GRYC1Clearance Fit3.00iH8/e7 ➢GRNC1Clearance Fit3.00iH7/f6 ➢LGNC1Clearance Fit2.00iH9/f8 ➢LGNC1Clearance Fit2.00iH8/f8 ➢LGNC1Clearance Fit2.00iH8/f7 ➢LGYC1Clearance Fit2.00iH7/g6 ➢LGYC1Clearance Fit1.00iH6/g5 ➢LGNC1Clearance Fit1.00iH10/h9 ➢LGYC1Clearance Fit0.00iH11/h10 ➢LGNC1Clearance Fit0.00iH9/h8 ➢LGNC1Clearance Fit0.00iH8/h8 ➢LGNC1Clearance Fit0.00iH6/h5 ➢LGNC1Clearance Fit0.00iH7/h6 ➢LGYC1Clearance Fit0.00iH8/h7 ➢LGYC1Clearance Fit-1.00iH6/js5 ➢orNT2Transition Fit-1.00iH7/js6 ➢orYT2Transition Fit-1.00iH8/k7 ➢orNT2Transition Fit-3.00iH6/k5 ➢orNT2Transition Fit-3.00iH7/k6 ➢orYT2Transition Fit-3.00iH7/m6 ➢orNT2Transition Fit-5.00iH6/m5 ➢orNT2Transition Fit-5.00iH8/m7 ➢orNT2Transition Fit-5.00iH7/n6 ➢orYT2Transition Fit-6.00iH8/js7 ➢orNT2Transition Fit-11.00iH6/n5 ➢LRNI3Press Fit (Interference)-6.00iH7/p6 ➢LRYI3Press Fit (Interference)-8.00iH6/p5 ➢LRNI3Press Fit (Interference)-8.00iH7/r6 ➢LRYI3Press Fit (Interference)-10.00iH7/s6 ➢RDYI3Press Fit (Interference)-11.00iH8/s7 ➢RDNI3Press Fit (Interference)-11.00iH7/t6 ➢RDNI3Press Fit (Interference)-12.00iH7/u6 ➢DRNI3Press Fit (Interference)-13.00iH8/u7 ➢DRNI3Press Fit (Interference)-13.00iH7/x6 ➢DRNI3Press Fit (Interference)-16.00Shaft Basis Fits (ISO 286-1)fit_typeFitFit LevelPreferedc_idfit_sortFit typeLeveliH10/b9 ➢DGNC1Clearance Fit6.00iH11/b11 ➢DGYC1Clearance Fit6.00iH10/c9 ➢DGNC1Clearance Fit5.00iH11/c11 ➢DGYC1Clearance Fit5.00iH8/d8 ➢GRNC1Clearance Fit4.00iH9/d8 ➢GRNC1Clearance Fit4.00iH10/d9 ➢GRYC1Clearance Fit4.00iH11/d10 ➢GRNC1Clearance Fit4.00iH10/e9 ➢GRNC1Clearance Fit3.00iH9/e8 ➢GRYC1Clearance Fit3.00iH8/e8 ➢GRYC1Clearance Fit3.00iH8/e7 ➢GRNC1Clearance Fit3.00iH7/f6 ➢LGNC1Clearance Fit2.00iH9/f8 ➢LGNC1Clearance Fit2.00iH8/f8 ➢LGNC1Clearance Fit2.00iH8/f7 ➢LGYC1Clearance Fit2.00iH7/g6 ➢LGYC1Clearance Fit1.00iH6/g5 ➢LGNC1Clearance Fit1.00iH10/h9 ➢LGYC1Clearance Fit0.00iH11/h10 ➢LGNC1Clearance Fit0.00iH9/h8 ➢LGNC1Clearance Fit0.00iH8/h8 ➢LGNC1Clearance Fit0.00iH6/h5 ➢LGNC1Clearance Fit0.00iH7/h6 ➢LGYC1Clearance Fit0.00iH8/h7 ➢LGYC1Clearance Fit-1.00iH6/js5 ➢orNT2Transition Fit-1.00iH7/js6 ➢orYT2Transition Fit-1.00iH8/k7 ➢orNT2Transition Fit-3.00iH6/k5 ➢orNT2Transition Fit-3.00iH7/k6 ➢orYT2Transition Fit-3.00iH7/m6 ➢orNT2Transition Fit-5.00iH6/m5 ➢orNT2Transition Fit-5.00iH8/m7 ➢orNT2Transition Fit-5.00iH7/n6 ➢orYT2Transition Fit-6.00iH8/js7 ➢orNT2Transition Fit-11.00iH6/n5 ➢LRNI3Press Fit (Interference)-6.00iH7/p6 ➢LRYI3Press Fit (Interference)-8.00iH6/p5 ➢LRNI3Press Fit (Interference)-8.00iH7/r6 ➢LRYI3Press Fit (Interference)-10.00iH7/s6 ➢RDYI3Press Fit (Interference)-11.00iH8/s7 ➢RDNI3Press Fit (Interference)-11.00iH7/t6 ➢RDNI3Press Fit (Interference)-12.00iH7/u6 ➢DRNI3Press Fit (Interference)-13.00iH8/u7 ➢DRNI3Press Fit (Interference)-13.00iH7/x6 ➢DRNI3Press Fit (Interference)-16.00Fit Combinations Per ANSI B4.1The tolerance classes mentioned in ANSI B4.1 (e.g., h9, g6, etc.) have the same nomenclature as in ISO 286. It could lead a confusion since the ANSI standard also defines the fundamental deviations and the tolerance grade on its own. The ANSI tolerancing system is nearly the same as the ISO 286 but not identical. If you take the values from the standard ISO charts or use our Online Calculator, you should expect about 0.1-0.5 thous errors. wdt_IDFit NameTolerance Class CombinationFit Typeth1RC 1H5/g4Running or Slidining Fits52RC 2H6/g5Running or Slidining Fits63RC 3H7/f6Running or Slidining Fits74RC 4H8/f7Running or Slidining Fits85RC 5H8/e7Running or Slidining Fits86RC 6H9/e8Running or Slidining Fits97RC 7H9/d8Running or Slidining Fits98RC 8H10/c9Running or Slidining Fits109RC 9H11/sh1Running or Slidining Fits1110LC 1H6/h5Clearance Location Fits611LC 2H7/h6Clearance Location Fits712LC 3H8/h7Clearance Location Fits813LC 4H10/h9Clearance Location Fits1014LC 5H7/g6Clearance Location Fits715LC 6H9/f8Clearance Location Fits916LC 7H10/e9Clearance Location Fits1017LC 8H10/d9Clearance Location Fits1018LC 9H11/c10Clearance Location Fits1119LC 10H12/sh2Clearance Location Fits1220LC 11H13/sh3Clearance Location Fits1321LT 1H7/js6Transition Fits722LT 2H8/js7Transition Fits823LT 3H7/k6Transition Fits724LT 4H8/k7Transition Fits825LT 5H7/n6Transition Fits726LT 6H7/n7Transition Fits727LN 1H6/n5Interference Location Fits628LN 2H7/p6Interference Location Fits729LN 3H7/r6Interference Location Fits730FN 1H6/sh4Force or Shrink Fits631FN 2H7/s6Force or Shrink Fits732FN 3H7/t6Force or Shrink Fits733FN 4H7/u6Force or Shrink Fits734FN 5H8/x7Force or Shrink Fits8Fit Combinations Per ANSI B4.2The tolerance classes mentioned in ANSI B4.1 (e.g., h9, g6, etc.) have the same nomenclature as in ISO 286. It could lead a confusion since the ANSI standard also defines the fundamental deviations and the tolerance grade on its own. The ANSI tolerancing system is nearly the same as the ISO 286 but not identical. If you take the values from the standard ISO charts or use our Online Calculator, you should expect about 0.1-0.5 thous errors.ClassificationHole BasisShaft BasisDescriptionClearanceH11/c11C11/h11Loose running fit for wide commercial tolerances or allowances on external members.H9/d9D9/h9Free running fit not for use where accuracy is essential, but good for large temperature variations, high running speeds, or heavy journal pressures.H8/f7F8/h7Close running fit for running on accurate machines and for accurate location at moderate speeds and journal pressures.H7/g6G7/h6Sliding fit not intended to run freely, but to move and turn freely and locate accurately.H7/h6H7/h6Locational clearance fit provides snug fit for locating stationary parts; but can be freely assembled and disassembled.InterferenceH7/k6K7/h6Locational transition fit for accurate location, a compromise between clearance and interference.H7/n6N7/h6Locational transition fit for more accurate location where greater interference is permissible.TransitionH7/p6P7/h6Locational interference fit for parts requiring rigidity and alignment with prime accuracy of location but without special bore pressure requirements.H7/s6S7/h6Medium drive fit for ordinary steel parts or shrink fits on light sections, the tightest fit usable with cast iron.H7/u6U7/h6Force fit suitable for parts which can be highly stressed or for shrink fits where the heavy pressing forces required are impractical.Related Glossary Terms:Thou

The standard tolerance grades are designated by the letters IT followed by a number, for example, IT7. When the tolerance grade is associated with a fundamental deviation symbol to form a tolerance class, the letters IT are omitted (e.g., h7, JS5)Fundamental DeviationA 1-2 letter code represents the fundamental deviation. Upper case (e.g., G, JS) designates hole deviations, while lower case (e.g., g, js) designates shaft deviations.Tolerance ClassThe tolerance class is designated by the letter(s) representing the fundamental deviation followed by the standard tolerance grade number. For example, a shaft with a deviation of g and a tolerance grade of T11 will be denoted as g11. A hole with a deviation of JS and a tolerance grade of IT7 will be represented as JS7.Tolerance SizeThe tolerance size combines the basic size with the tolerance class, designated by the basic size, followedby the designation of the required tolerance class (without spaces). For example, 32H7 specifies a hole with a nominal size of 32 mm, deviation H, and tolerance grade of IT7.Tolerances ChartsStandard Tolerance Grades (IT) ChartTolerance Dimensions in MicronsTo convert to millimeters, divide by 1000To convert to Thous, divide by 25.4 wdt_IDDiameter Range (mm)(Inches)IT01IT0IT1IT2IT3IT4IT5IT6IT7IT8IT9IT10IT11IT12IT13IT14IT15IT16IT17IT1810 - 30 - 0.120.30.50.81.2234610142540601001402504006001000140023 - 60.12 - 0.240.40.611.52.545812183048751201803004807501200180036 - 100.24 - 0.40.40.611.52.5469152236589015022036058090015002200410 - 180.4 - 0.710.50.81.223581118274370110180270430700110018002700518 - 300.71 - 1.190.611.52.54691321335284130210330520840130021003300630 - 501.19 - 1.970.611.52.54711162539621001602503906201000160025003900750 - 801.97 - 3.150.81.2235813193046741201903004607401200190030004600880 - 1203.15 - 4.7311.52.54610152235548714022035054087014002200350054009120 - 1804.73 - 7.091.223.55812182540631001602504006301000160025004000630010180 - 2507.09 - 9.85234.571014202946721151852904607201150185029004600720011250 - 3159.85 - 12.412.54681216233252811302103205208101300210032005200810012315 - 40012.41 - 15.7535791318253657891402303605708901400230036005700890013400 - 50015.75 - 19.7468101520274063971552504006309701550250040006300970014500 - 63019.7 - 24.84.569111622324470110175280440700110017502800440070001100015630 - 80024.8 - 31.55710131825365080125200320500800125020003200500080001250016800 - 100031.5 - 39.45.58111521284056901402303605609001400230036005600900014000171000 - 125039.4 - 49.26.59131824334766105165260420660105016502600420066001050016500181250 - 160049.2 - 63811152129395578125195310500780125019503100500078001250019500191600 - 200063 - 78.7913182535466592150230370600920150023003700600092001500023000202000 - 250078.7 - 98.4111522304155781101752804407001100175028004400700011001750028000212500 - 315098.4 - 1241318263650689613521033054086013502100330054008600135002100033000Fundamental deviation of holes ChartClick the Tolerance Link (e.g., H ➢) to get the Full & Accurate charts for a specific deviation in Inch and Metric unitsClick  icons to show all columns for the entire diameter range (0-3,150 mm)The deviations of J through Z also depend on the IT Therefore, the values in the below table are only accurate in some cases. To get the correct value in all cases, click the Tolerance Link (e.g., H ➢).Dimentions in Microns. To convert to millimeters, divide by 1000, to Thous, divide by 25.4 Deviationidurl0 - 3 mm3 - 6 mm6 - 1010 - 1414 - 1818 - 2424 - 3030 - 4040 - 5050 - 6565 - 8080 - 100100 - 120120 - 140140 - 160160 - 180180 - 200200 - 225225 - 250250 - 280280 - 315315 - 355355 - 400400 - 450450 - 500500 - 560560 - 630630 - 710710 - 800800 - 900900 - 10001000 - 11201120 - 12501250 - 14001400 - 16001600 - 18001800 - 20002000 - 22402240 - 25002500 - 28002800 - 3150A ➢1calculators/tolerances/tol?dev=a||A ➢27027028029029030030031032034036038041046052058066074082092010501200135015001650XXXXXXXXXXXXXXXXB ➢2calculators/tolerances/tol?dev=b||B ➢140140150150150160160170180190200220240260280310340380420480540600680760840XXXXXXXXXXXXXXXXC ➢3calculators/tolerances/tol?dev=c||C ➢6070809595110110120130140150170180200210230240260280300330360400440480520580640700780860940105011501300145016001800200022002500CD ➢4calculators/tolerances/tol?dev=cd||CD ➢344656XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXD ➢5calculators/tolerances/tol?dev=d||D ➢203040505065658080100100120120145145145170170170190190210210230230260260290290320320350350390390430430480480520520E ➢6calculators/tolerances/tol?dev=e||E ➢14202532324040505060607272858585100100100110110125125135135145145160160170170195195220220240240260260290290EF ➢7calculators/tolerances/tol?dev=ef||EF ➢101418XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXF ➢8calculators/tolerances/tol?dev=f||F ➢61013161620202525303036364343435050505656626268687676808086869898110110120120130130145145FG ➢9calculators/tolerances/tol?dev=fg||FG ➢468XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXG ➢10calculators/tolerances/tol?dev=g||G ➢2456677991010121214141415151517171818202022222424262628283030323234343838H ➢11calculators/tolerances/tol?dev=h||H ➢00000000000000000000000000000000000000000JS ➢12calculators/tolerances/tol?dev=js||JS ➢00000000000000000000000000000000000000000J ➢13calculators/tolerances/tol?dev=j||J ➢46810101212141418182222262626303030363639394343XXXXXXXXXXXXXXXXK ➢14calculators/tolerances/tol?dev=k||K ➢0-1-1-1-1-2-2-2-2-2-2-3-3-3-3-3-4-4-4-4-4-4-4-5-50000000000000000M ➢15calculators/tolerances/tol?dev=m||M ➢-2-4-6-7-7-8-8-9-9-11-11-13-13-15-15-15-17-17-17-20-20-21-21-23-23-26-26-30-30-34-34-40-40-48-48-58-58-68-68-76-76N ➢16calculators/tolerances/tol?dev=n||N ➢-4-8-10-12-12-15-15-17-17-20-20-23-23-27-27-27-31-31-31-34-34-37-37-40-40-44-44-50-50-56-56-66-66-78-78-92-92-110-110-135-135P ➢17calculators/tolerances/tol?dev=p||P ➢-6-12-15-18-18-22-22-26-26-32-32-37-37-43-43-43-50-50-50-56-56-62-62-68-68-78-78-88-88-100-100-120-120-140-140-170-170-195-195-240-240R ➢18calculators/tolerances/tol?dev=r||R ➢-10-15-19-23-23-28-28-34-34-41-43-51-54-63-65-68-77-80-84-94-98-108-114-126-132-150-155-175-185-210-220-250-260-300-330-370-400-440-460-550-580S ➢19calculators/tolerances/tol?dev=s||S ➢-14-19-23-28-28-35-35-43-43-53-59-71-79-92-100-108-122-130-140-158-170-190-208-232-252-280-310-340-380-430-470-520-580-640-720-820-920-1000-1100-1250-1400T ➢20calculators/tolerances/tol?dev=t||T ➢000XXX-41-48-54-66-75-91-104-122-134-146-166-180-196-218-240-268-294-330-360-400-450-500-560-620-680-780-840-960-1050-1200-1350-1500-1650-1900-2100U ➢21calculators/tolerances/tol?dev=u||U ➢-18-23-28-33-33-41-48-60-70-87-102-124-144-170-190-210-236-258-284-315-350-390-435-490-540-600-660-740-840-940-1050-1150-1300-1450-1600-1850-2000-2300-2500-2900-3200V ➢22calculators/tolerances/tol?dev=v||V ➢000X-39-47-55-68-81-102-120-146-172-202-228-252-284-310-340-385-425-475-530-595-660-740-820-920-1000-1150-1300-1450-1600-1800-2000-2300-2500-2800-3100-3500-3900X ➢23calculators/tolerances/tol?dev=x||X ➢-20-28-34-40-45-54-64-80-97-122-146-178-210-248-280-310-340-385-425-475-525-590-660-740-820XXXXXXXXXXXXXXXXY ➢24calculators/tolerances/tol?dev=y||Y ➢000XX-63-75-94-114-144-174-214-254-300-340-380-425-470-520-580-650-730-820-920-1000XXXXXXXXXXXXXXXXZ ➢25calculators/tolerances/tol?dev=z||Z ➢-26-35-42-50-60-73-88-112-136-172-210-258-310-365-415-465-520-575-640-710-790-900-1000-1100-1250XXXXXXXXXXXXXXXXZA ➢26calculators/tolerances/tol?dev=za||ZA ➢-32-42-52-64-77-98-118-148-180-226-274-335-400-470-535-600-670-740-820-920-1000-1150-1300-1450-1600XXXXXXXXXXXXXXXXFundamental deviation of shafts ChartClick the Tolerance Link (e.g., g ➢) to get the Full & Accurate charts for a specific deviation in Inch and Metric unitsClick  icons to show all columns of the entire diameter range (0-3,150 mm)The deviations of J through Z also depend on the IT Therefore, the values in the below table are only accurate in some cases. To get the correct value in all cases, click the Tolerance Link (e.g., g ➢).Dimentions in Microns. To convert to millimeters, divide by 1000, to Thous, divide by 25.4 Deviationidurl0 - 3 mm3 - 6 mm6 - 1010 - 1414 - 1818 - 2424 - 3030 - 4040 - 5050 - 6565 - 8080 - 100100 - 120120 - 140140 - 160160 - 180180 - 200200 - 225225 - 250250 - 280280 - 315315 - 355355 - 400400 - 450450 - 500500 - 560560 - 630630 - 710710 - 800800 - 900900 - 10001000 - 11201120 - 12501250 - 14001400 - 16001600 - 18001800 - 20002000 - 22402240 - 25002500 - 28002800 - 3150a ➢1calculators/tolerances/tol?dev=a||A ➢-270-270-280-290-290-300-300-310-320-340-360-380-410-460-520-580-660-740-820-920-1050-1200-1350-1500-1650XXXXXXXXXXXXXXXXb ➢2calculators/tolerances/tol?dev=b||B ➢-140-140-150-150-150-160-160-170-180-190-200-220-240-260-280-310-340-380-420-480-540-600-680-760-840XXXXXXXXXXXXXXXXc ➢3calculators/tolerances/tol?dev=c||C ➢-60-70-80-95-95-110-110-120-130-140-150-170-180-200-210-230-240-260-280-300-330-360-400-440-480-520-580-640-700-780-860-940-1050-1150-1300-1450-1600-1800-2000-2200-2500cd ➢4calculators/tolerances/tol?dev=cd||CD ➢-34-46-56XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXd ➢5calculators/tolerances/tol?dev=d||D ➢-20-30-40-50-50-65-65-80-80-100-100-120-120-145-145-145-170-170-170-190-190-210-210-230-230-260-260-290-290-320-320-350-350-390-390-430-430-480-480-520-520e ➢6calculators/tolerances/tol?dev=e||E ➢-14-20-25-32-32-40-40-50-50-60-60-72-72-85-85-85-100-100-100-110-110-125-125-135-135-145-145-160-160-170-170-195-195-220-220-240-240-260-260-290-290ef ➢7calculators/tolerances/tol?dev=ef||EF ➢-10-14-18XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXf ➢8calculators/tolerances/tol?dev=f||F ➢-6-10-13-16-16-20-20-25-25-30-30-36-36-43-43-43-50-50-50-56-56-62-62-68-68-76-76-80-80-86-86-98-98-110-110-120-120-130-130-145-145fg ➢9calculators/tolerances/tol?dev=fg||FG ➢-4-6-8XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXg ➢10calculators/tolerances/tol?dev=g||G ➢-2-4-5-6-6-7-7-9-9-10-10-12-12-14-14-14-15-15-15-17-17-18-18-20-20-22-22-24-24-26-26-28-28-30-30-32-32-34-34-38-38h ➢11calculators/tolerances/tol?dev=h||H ➢00000000000000000000000000000000000000000js ➢12calculators/tolerances/tol?dev=js||JS ➢00000000000000000000000000000000000000000j ➢13calculators/tolerances/tol?dev=j||J ➢-4-6-8-10-10-12-12-14-14-18-18-22-22-26-26-26-30-30-30-36-36-39-39-43-43XXXXXXXXXXXXXXXXk ➢14calculators/tolerances/tol?dev=k||K ➢01111222222333334444444550000000000000000m ➢15calculators/tolerances/tol?dev=m||M ➢2467788991111131315151517171720202121232326263030343440404848585868687676n ➢16calculators/tolerances/tol?dev=n||N ➢481012121515171720202323272727313131343437374040444450505656666678789292110110135135p ➢17calculators/tolerances/tol?dev=p||P ➢612151818222226263232373743434350505056566262686878788888100100120120140140170170195195240240r ➢18calculators/tolerances/tol?dev=r||R ➢101519232328283434414351546365687780849498108114126132150155175185210220250260300330370400440460550580s ➢19calculators/tolerances/tol?dev=s||S ➢14192328283535434353597179921001081221301401581701902082322522803103403804304705205806407208209201000110012501400t ➢20calculators/tolerances/tol?dev=t||T ➢000XXX4148546675911041221341461661801962182402682943303604004505005606206807808409601050120013501500165019002100u ➢21calculators/tolerances/tol?dev=u||U ➢1823283333414860708710212414417019021023625828431535039043549054060066074084094010501150130014501600185020002300250029003200v ➢22calculators/tolerances/tol?dev=v||V ➢000X39475568811021201461722022282522843103403854254755305956607408209201000115013001450160018002000230025002800310035003900x ➢23calculators/tolerances/tol?dev=x||X ➢202834404554648097122146178210248280310340385425475525590660740820XXXXXXXXXXXXXXXXy ➢24calculators/tolerances/tol?dev=y||Y ➢000XX6375941141441742142543003403804254705205806507308209201000XXXXXXXXXXXXXXXXz ➢25calculators/tolerances/tol?dev=z||Z ➢26354250607388112136172210258310365415465520575640710790900100011001250XXXXXXXXXXXXXXXXza ➢26calculators/tolerances/tol?dev=za||ZA ➢32425264779811814818022627433540047053560067074082092010001150130014501600XXXXXXXXXXXXXXXXEngineering FitsEngineering fit refers to the degree of tightness or looseness between two mating parts in an assembly. It is defined by combining a hole with a tolerance class and a shaft with a tolerance class. (See definition of terms above).Several standards define recommended pairings for different applications. The values presented in our charts and Calculator are based on ISO 286-1:2010 (In earlier revisions, it was separated into ISO 1829, which is now obsolete). In North America, additional fit combinations are sometimes used per ANSI B4.1 & B4.2. The ANSI tolerancing system is nearly equivalent to ISO 286 but not identical. The difference is typically 0.1-0.5 thous.Main Fit TypesClearance FitA clearance fit is a type in which the shaft is smaller than the hole it is inserted into, allowing for free movement, assembly, and disassembly. Clearance fits can range from loose-running for assemblies that need a significant gap for free movement or to accommodate temperature variation to locational clearance for stationary parts that need to be freely assembled/disassembled but still maintain accuracy.Transition FitA transition fit is a type in which the shaft may be slightly smaller or larger than the hole (before assembly). It is used to create a tight and secure connection between them in applications requiring high precision and stability. It provides high accuracy, but the connecting parts can be disassembled and reassembled without damage. However, force cannot be transmitted.Press Fit (Interference)An interference (Press) fit is a type in which the shaft is larger than the hole (before assembly). It creates a frictional force that holds the parts together without the need for additional fasteners or adhesives. The interference fit is commonly used in mechanical engineering to create solid and reliable connections between components that need to withstand heavy loads or vibrations. However, It is hard to disassemble without damaging the parts. Some degree of force can be transmitted between the components.Fits are also divided into two types of “basis”There are no technical differences between the two basis. Therefore the choice of the system should be based on economic reasons.Hole Basis FitsThe hole deviation is zero (meaning an H), and the shaft deviation varies to create different fit levels. For example, H9/d8 , H7/g6. It is the first choice of combinations for general use, since it avoids an unnecessary multiplicity of tools (e.g., reamers) and gaugesShaft Basis FitsThe shaft deviation is zero (meaning an h), and the hole deviation varies to create different fit levels. For example, D9/h9, G7/h6. This method should only be utilized when it offers clear economic benefits, such as in situations where it is required to assemble multiple parts with holes that have varying deviations onto a single shaft.Fits Standard Combinations ChartsFor ordinary engineering purposes, only a small number of the many (~150,000) possible fit combinations is required. ISO 286-1:2010 lists about 80 fit combinations that meet most of the needs of any engineering task. You can choose from this list or define a custom combination in our Fit Calculator.(*) In North America, additional fit combinations are sometimes used per ANSI B4.1 & B4.2. You can find below the ISO charts also the ANSI Charts.Click the Fit Link (e.g. G7/h6 ➢) to get its detailed tolerances in both Inch and millimetersHole Basis Fits (ISO 286-1)fit_typeFitFit LevelPreferedc_idfit_sortFit typeLeveliH10/b9 ➢DGNC1Clearance Fit6.00iH11/b11 ➢DGYC1Clearance Fit6.00iH10/c9 ➢DGNC1Clearance Fit5.00iH11/c11 ➢DGYC1Clearance Fit5.00iH8/d8 ➢GRNC1Clearance Fit4.00iH9/d8 ➢GRNC1Clearance Fit4.00iH10/d9 ➢GRYC1Clearance Fit4.00iH11/d10 ➢GRNC1Clearance Fit4.00iH10/e9 ➢GRNC1Clearance Fit3.00iH9/e8 ➢GRYC1Clearance Fit3.00iH8/e8 ➢GRYC1Clearance Fit3.00iH8/e7 ➢GRNC1Clearance Fit3.00iH7/f6 ➢LGNC1Clearance Fit2.00iH9/f8 ➢LGNC1Clearance Fit2.00iH8/f8 ➢LGNC1Clearance Fit2.00iH8/f7 ➢LGYC1Clearance Fit2.00iH7/g6 ➢LGYC1Clearance Fit1.00iH6/g5 ➢LGNC1Clearance Fit1.00iH10/h9 ➢LGYC1Clearance Fit0.00iH11/h10 ➢LGNC1Clearance Fit0.00iH9/h8 ➢LGNC1Clearance Fit0.00iH8/h8 ➢LGNC1Clearance Fit0.00iH6/h5 ➢LGNC1Clearance Fit0.00iH7/h6 ➢LGYC1Clearance Fit0.00iH8/h7 ➢LGYC1Clearance Fit-1.00iH6/js5 ➢orNT2Transition Fit-1.00iH7/js6 ➢orYT2Transition Fit-1.00iH8/k7 ➢orNT2Transition Fit-3.00iH6/k5 ➢orNT2Transition Fit-3.00iH7/k6 ➢orYT2Transition Fit-3.00iH7/m6 ➢orNT2Transition Fit-5.00iH6/m5 ➢orNT2Transition Fit-5.00iH8/m7 ➢orNT2Transition Fit-5.00iH7/n6 ➢orYT2Transition Fit-6.00iH8/js7 ➢orNT2Transition Fit-11.00iH6/n5 ➢LRNI3Press Fit (Interference)-6.00iH7/p6 ➢LRYI3Press Fit (Interference)-8.00iH6/p5 ➢LRNI3Press Fit (Interference)-8.00iH7/r6 ➢LRYI3Press Fit (Interference)-10.00iH7/s6 ➢RDYI3Press Fit (Interference)-11.00iH8/s7 ➢RDNI3Press Fit (Interference)-11.00iH7/t6 ➢RDNI3Press Fit (Interference)-12.00iH7/u6 ➢DRNI3Press Fit (Interference)-13.00iH8/u7 ➢DRNI3Press Fit (Interference)-13.00iH7/x6 ➢DRNI3Press Fit (Interference)-16.00Shaft Basis Fits (ISO 286-1)fit_typeFitFit LevelPreferedc_idfit_sortFit typeLeveliH10/b9 ➢DGNC1Clearance Fit6.00iH11/b11 ➢DGYC1Clearance Fit6.00iH10/c9 ➢DGNC1Clearance Fit5.00iH11/c11 ➢DGYC1Clearance Fit5.00iH8/d8 ➢GRNC1Clearance Fit4.00iH9/d8 ➢GRNC1Clearance Fit4.00iH10/d9 ➢GRYC1Clearance Fit4.00iH11/d10 ➢GRNC1Clearance Fit4.00iH10/e9 ➢GRNC1Clearance Fit3.00iH9/e8 ➢GRYC1Clearance Fit3.00iH8/e8 ➢GRYC1Clearance Fit3.00iH8/e7 ➢GRNC1Clearance Fit3.00iH7/f6 ➢LGNC1Clearance Fit2.00iH9/f8 ➢LGNC1Clearance Fit2.00iH8/f8 ➢LGNC1Clearance Fit2.00iH8/f7 ➢LGYC1Clearance Fit2.00iH7/g6 ➢LGYC1Clearance Fit1.00iH6/g5 ➢LGNC1Clearance Fit1.00iH10/h9 ➢LGYC1Clearance Fit0.00iH11/h10 ➢LGNC1Clearance Fit0.00iH9/h8 ➢LGNC1Clearance Fit0.00iH8/h8 ➢LGNC1Clearance Fit0.00iH6/h5 ➢LGNC1Clearance Fit0.00iH7/h6 ➢LGYC1Clearance Fit0.00iH8/h7 ➢LGYC1Clearance Fit-1.00iH6/js5 ➢orNT2Transition Fit-1.00iH7/js6 ➢orYT2Transition Fit-1.00iH8/k7 ➢orNT2Transition Fit-3.00iH6/k5 ➢orNT2Transition Fit-3.00iH7/k6 ➢orYT2Transition Fit-3.00iH7/m6 ➢orNT2Transition Fit-5.00iH6/m5 ➢orNT2Transition Fit-5.00iH8/m7 ➢orNT2Transition Fit-5.00iH7/n6 ➢orYT2Transition Fit-6.00iH8/js7 ➢orNT2Transition Fit-11.00iH6/n5 ➢LRNI3Press Fit (Interference)-6.00iH7/p6 ➢LRYI3Press Fit (Interference)-8.00iH6/p5 ➢LRNI3Press Fit (Interference)-8.00iH7/r6 ➢LRYI3Press Fit (Interference)-10.00iH7/s6 ➢RDYI3Press Fit (Interference)-11.00iH8/s7 ➢RDNI3Press Fit (Interference)-11.00iH7/t6 ➢RDNI3Press Fit (Interference)-12.00iH7/u6 ➢DRNI3Press Fit (Interference)-13.00iH8/u7 ➢DRNI3Press Fit (Interference)-13.00iH7/x6 ➢DRNI3Press Fit (Interference)-16.00Fit Combinations Per ANSI B4.1The tolerance classes mentioned in ANSI B4.1 (e.g., h9, g6, etc.) have the same nomenclature as in ISO 286. It could lead a confusion since the ANSI standard also defines the fundamental deviations and the tolerance grade on its own. The ANSI tolerancing system is nearly the same as the ISO 286 but not identical. If you take the values from the standard ISO charts or use our Online Calculator, you should expect about 0.1-0.5 thous errors. wdt_IDFit NameTolerance Class CombinationFit Typeth1RC 1H5/g4Running or Slidining Fits52RC 2H6/g5Running or Slidining Fits63RC 3H7/f6Running or Slidining Fits74RC 4H8/f7Running or Slidining Fits85RC 5H8/e7Running or Slidining Fits86RC 6H9/e8Running or Slidining Fits97RC 7H9/d8Running or Slidining Fits98RC 8H10/c9Running or Slidining Fits109RC 9H11/sh1Running or Slidining Fits1110LC 1H6/h5Clearance Location Fits611LC 2H7/h6Clearance Location Fits712LC 3H8/h7Clearance Location Fits813LC 4H10/h9Clearance Location Fits1014LC 5H7/g6Clearance Location Fits715LC 6H9/f8Clearance Location Fits916LC 7H10/e9Clearance Location Fits1017LC 8H10/d9Clearance Location Fits1018LC 9H11/c10Clearance Location Fits1119LC 10H12/sh2Clearance Location Fits1220LC 11H13/sh3Clearance Location Fits1321LT 1H7/js6Transition Fits722LT 2H8/js7Transition Fits823LT 3H7/k6Transition Fits724LT 4H8/k7Transition Fits825LT 5H7/n6Transition Fits726LT 6H7/n7Transition Fits727LN 1H6/n5Interference Location Fits628LN 2H7/p6Interference Location Fits729LN 3H7/r6Interference Location Fits730FN 1H6/sh4Force or Shrink Fits631FN 2H7/s6Force or Shrink Fits732FN 3H7/t6Force or Shrink Fits733FN 4H7/u6Force or Shrink Fits734FN 5H8/x7Force or Shrink Fits8Fit Combinations Per ANSI B4.2The tolerance classes mentioned in ANSI B4.1 (e.g., h9, g6, etc.) have the same nomenclature as in ISO 286. It could lead a confusion since the ANSI standard also defines the fundamental deviations and the tolerance grade on its own. The ANSI tolerancing system is nearly the same as the ISO 286 but not identical. If you take the values from the standard ISO charts or use our Online Calculator, you should expect about 0.1-0.5 thous errors.ClassificationHole BasisShaft BasisDescriptionClearanceH11/c11C11/h11Loose running fit for wide commercial tolerances or allowances on external members.H9/d9D9/h9Free running fit not for use where accuracy is essential, but good for large temperature variations, high running speeds, or heavy journal pressures.H8/f7F8/h7Close running fit for running on accurate machines and for accurate location at moderate speeds and journal pressures.H7/g6G7/h6Sliding fit not intended to run freely, but to move and turn freely and locate accurately.H7/h6H7/h6Locational clearance fit provides snug fit for locating stationary parts; but can be freely assembled and disassembled.InterferenceH7/k6K7/h6Locational transition fit for accurate location, a compromise between clearance and interference.H7/n6N7/h6Locational transition fit for more accurate location where greater interference is permissible.TransitionH7/p6P7/h6Locational interference fit for parts requiring rigidity and alignment with prime accuracy of location but without special bore pressure requirements.H7/s6S7/h6Medium drive fit for ordinary steel parts or shrink fits on light sections, the tightest fit usable with cast iron.H7/u6U7/h6Force fit suitable for parts which can be highly stressed or for shrink fits where the heavy pressing forces required are impractical.Related Glossary Terms:Thou

: 1F, Building B, Sanfang Industrial Area, Xiansha, Gaobu Town,Dongguan City, Guangdong Province, P.R. China : +86-769-2319-0193 : +86-769-8870-5839 : +86-136-1014-9979 : Jeremy@otaisteel.com

For welding purposes, the ratio of manganese to sulphur should be at least 10 to 1. Manganese content of less than 0.30% may promote internal porosity and cracking in the weld bead, cracking can also result if the content is over 0.80%. Steel with low Manganese Sulphide ratio may contain sulphur in the form of iron Sulphide (FeS), which can cause cracking in the weld.

will deflect creating a bad surface finish and, in extreme cases, chip or break the bit. ... If doing this, it will be necessary to calculate the feed rate and ...

The effects of Vanadium chemical element are similar to those of Mn, Mo, and Cb. When used with other alloying elements it restricts grain growth, refines grain size, increases hardenability, fracture toughness, and resistance to shock loading. Softening at high temperatures, fatigue stress and wear resistance are improved. At greater than 0.05%, there may be a tendency for the steel to become embrittled during thermal stress relief treatments.

It is used with chromium, vanadium, molybdenum, or manganese to produce high speed steel used in cutting tools. Tungsten steel is said to be “red-hard” or hard enough to cut after it becomes red-hot. After heat treatment the steel maintains its hardness at high temperature making it particularly suitable for cutting tools.

Zirconium is added to steel to modify the shape of inclusions. Typically added to low alloy, low carbon steels. The result is that toughness and ductility are improved when transforms shape from elongated to globular, improving toughness and ductility.

Very interesting. This is no doubt of interest to gas manufacturers who produce gas blends for cutting and welding purposes. Also to those companies who manufacture tools for cutting and CNC applications.

A transition fit is a type in which the shaft may be slightly smaller or larger than the hole (before assembly). It is used to create a tight and secure connection between them in applications requiring high precision and stability. It provides high accuracy, but the connecting parts can be disassembled and reassembled without damage. However, force cannot be transmitted.Press Fit (Interference)An interference (Press) fit is a type in which the shaft is larger than the hole (before assembly). It creates a frictional force that holds the parts together without the need for additional fasteners or adhesives. The interference fit is commonly used in mechanical engineering to create solid and reliable connections between components that need to withstand heavy loads or vibrations. However, It is hard to disassemble without damaging the parts. Some degree of force can be transmitted between the components.Fits are also divided into two types of “basis”There are no technical differences between the two basis. Therefore the choice of the system should be based on economic reasons.Hole Basis FitsThe hole deviation is zero (meaning an H), and the shaft deviation varies to create different fit levels. For example, H9/d8 , H7/g6. It is the first choice of combinations for general use, since it avoids an unnecessary multiplicity of tools (e.g., reamers) and gaugesShaft Basis FitsThe shaft deviation is zero (meaning an h), and the hole deviation varies to create different fit levels. For example, D9/h9, G7/h6. This method should only be utilized when it offers clear economic benefits, such as in situations where it is required to assemble multiple parts with holes that have varying deviations onto a single shaft.Fits Standard Combinations ChartsFor ordinary engineering purposes, only a small number of the many (~150,000) possible fit combinations is required. ISO 286-1:2010 lists about 80 fit combinations that meet most of the needs of any engineering task. You can choose from this list or define a custom combination in our Fit Calculator.(*) In North America, additional fit combinations are sometimes used per ANSI B4.1 & B4.2. You can find below the ISO charts also the ANSI Charts.Click the Fit Link (e.g. G7/h6 ➢) to get its detailed tolerances in both Inch and millimetersHole Basis Fits (ISO 286-1)fit_typeFitFit LevelPreferedc_idfit_sortFit typeLeveliH10/b9 ➢DGNC1Clearance Fit6.00iH11/b11 ➢DGYC1Clearance Fit6.00iH10/c9 ➢DGNC1Clearance Fit5.00iH11/c11 ➢DGYC1Clearance Fit5.00iH8/d8 ➢GRNC1Clearance Fit4.00iH9/d8 ➢GRNC1Clearance Fit4.00iH10/d9 ➢GRYC1Clearance Fit4.00iH11/d10 ➢GRNC1Clearance Fit4.00iH10/e9 ➢GRNC1Clearance Fit3.00iH9/e8 ➢GRYC1Clearance Fit3.00iH8/e8 ➢GRYC1Clearance Fit3.00iH8/e7 ➢GRNC1Clearance Fit3.00iH7/f6 ➢LGNC1Clearance Fit2.00iH9/f8 ➢LGNC1Clearance Fit2.00iH8/f8 ➢LGNC1Clearance Fit2.00iH8/f7 ➢LGYC1Clearance Fit2.00iH7/g6 ➢LGYC1Clearance Fit1.00iH6/g5 ➢LGNC1Clearance Fit1.00iH10/h9 ➢LGYC1Clearance Fit0.00iH11/h10 ➢LGNC1Clearance Fit0.00iH9/h8 ➢LGNC1Clearance Fit0.00iH8/h8 ➢LGNC1Clearance Fit0.00iH6/h5 ➢LGNC1Clearance Fit0.00iH7/h6 ➢LGYC1Clearance Fit0.00iH8/h7 ➢LGYC1Clearance Fit-1.00iH6/js5 ➢orNT2Transition Fit-1.00iH7/js6 ➢orYT2Transition Fit-1.00iH8/k7 ➢orNT2Transition Fit-3.00iH6/k5 ➢orNT2Transition Fit-3.00iH7/k6 ➢orYT2Transition Fit-3.00iH7/m6 ➢orNT2Transition Fit-5.00iH6/m5 ➢orNT2Transition Fit-5.00iH8/m7 ➢orNT2Transition Fit-5.00iH7/n6 ➢orYT2Transition Fit-6.00iH8/js7 ➢orNT2Transition Fit-11.00iH6/n5 ➢LRNI3Press Fit (Interference)-6.00iH7/p6 ➢LRYI3Press Fit (Interference)-8.00iH6/p5 ➢LRNI3Press Fit (Interference)-8.00iH7/r6 ➢LRYI3Press Fit (Interference)-10.00iH7/s6 ➢RDYI3Press Fit (Interference)-11.00iH8/s7 ➢RDNI3Press Fit (Interference)-11.00iH7/t6 ➢RDNI3Press Fit (Interference)-12.00iH7/u6 ➢DRNI3Press Fit (Interference)-13.00iH8/u7 ➢DRNI3Press Fit (Interference)-13.00iH7/x6 ➢DRNI3Press Fit (Interference)-16.00Shaft Basis Fits (ISO 286-1)fit_typeFitFit LevelPreferedc_idfit_sortFit typeLeveliH10/b9 ➢DGNC1Clearance Fit6.00iH11/b11 ➢DGYC1Clearance Fit6.00iH10/c9 ➢DGNC1Clearance Fit5.00iH11/c11 ➢DGYC1Clearance Fit5.00iH8/d8 ➢GRNC1Clearance Fit4.00iH9/d8 ➢GRNC1Clearance Fit4.00iH10/d9 ➢GRYC1Clearance Fit4.00iH11/d10 ➢GRNC1Clearance Fit4.00iH10/e9 ➢GRNC1Clearance Fit3.00iH9/e8 ➢GRYC1Clearance Fit3.00iH8/e8 ➢GRYC1Clearance Fit3.00iH8/e7 ➢GRNC1Clearance Fit3.00iH7/f6 ➢LGNC1Clearance Fit2.00iH9/f8 ➢LGNC1Clearance Fit2.00iH8/f8 ➢LGNC1Clearance Fit2.00iH8/f7 ➢LGYC1Clearance Fit2.00iH7/g6 ➢LGYC1Clearance Fit1.00iH6/g5 ➢LGNC1Clearance Fit1.00iH10/h9 ➢LGYC1Clearance Fit0.00iH11/h10 ➢LGNC1Clearance Fit0.00iH9/h8 ➢LGNC1Clearance Fit0.00iH8/h8 ➢LGNC1Clearance Fit0.00iH6/h5 ➢LGNC1Clearance Fit0.00iH7/h6 ➢LGYC1Clearance Fit0.00iH8/h7 ➢LGYC1Clearance Fit-1.00iH6/js5 ➢orNT2Transition Fit-1.00iH7/js6 ➢orYT2Transition Fit-1.00iH8/k7 ➢orNT2Transition Fit-3.00iH6/k5 ➢orNT2Transition Fit-3.00iH7/k6 ➢orYT2Transition Fit-3.00iH7/m6 ➢orNT2Transition Fit-5.00iH6/m5 ➢orNT2Transition Fit-5.00iH8/m7 ➢orNT2Transition Fit-5.00iH7/n6 ➢orYT2Transition Fit-6.00iH8/js7 ➢orNT2Transition Fit-11.00iH6/n5 ➢LRNI3Press Fit (Interference)-6.00iH7/p6 ➢LRYI3Press Fit (Interference)-8.00iH6/p5 ➢LRNI3Press Fit (Interference)-8.00iH7/r6 ➢LRYI3Press Fit (Interference)-10.00iH7/s6 ➢RDYI3Press Fit (Interference)-11.00iH8/s7 ➢RDNI3Press Fit (Interference)-11.00iH7/t6 ➢RDNI3Press Fit (Interference)-12.00iH7/u6 ➢DRNI3Press Fit (Interference)-13.00iH8/u7 ➢DRNI3Press Fit (Interference)-13.00iH7/x6 ➢DRNI3Press Fit (Interference)-16.00Fit Combinations Per ANSI B4.1The tolerance classes mentioned in ANSI B4.1 (e.g., h9, g6, etc.) have the same nomenclature as in ISO 286. It could lead a confusion since the ANSI standard also defines the fundamental deviations and the tolerance grade on its own. The ANSI tolerancing system is nearly the same as the ISO 286 but not identical. If you take the values from the standard ISO charts or use our Online Calculator, you should expect about 0.1-0.5 thous errors. wdt_IDFit NameTolerance Class CombinationFit Typeth1RC 1H5/g4Running or Slidining Fits52RC 2H6/g5Running or Slidining Fits63RC 3H7/f6Running or Slidining Fits74RC 4H8/f7Running or Slidining Fits85RC 5H8/e7Running or Slidining Fits86RC 6H9/e8Running or Slidining Fits97RC 7H9/d8Running or Slidining Fits98RC 8H10/c9Running or Slidining Fits109RC 9H11/sh1Running or Slidining Fits1110LC 1H6/h5Clearance Location Fits611LC 2H7/h6Clearance Location Fits712LC 3H8/h7Clearance Location Fits813LC 4H10/h9Clearance Location Fits1014LC 5H7/g6Clearance Location Fits715LC 6H9/f8Clearance Location Fits916LC 7H10/e9Clearance Location Fits1017LC 8H10/d9Clearance Location Fits1018LC 9H11/c10Clearance Location Fits1119LC 10H12/sh2Clearance Location Fits1220LC 11H13/sh3Clearance Location Fits1321LT 1H7/js6Transition Fits722LT 2H8/js7Transition Fits823LT 3H7/k6Transition Fits724LT 4H8/k7Transition Fits825LT 5H7/n6Transition Fits726LT 6H7/n7Transition Fits727LN 1H6/n5Interference Location Fits628LN 2H7/p6Interference Location Fits729LN 3H7/r6Interference Location Fits730FN 1H6/sh4Force or Shrink Fits631FN 2H7/s6Force or Shrink Fits732FN 3H7/t6Force or Shrink Fits733FN 4H7/u6Force or Shrink Fits734FN 5H8/x7Force or Shrink Fits8Fit Combinations Per ANSI B4.2The tolerance classes mentioned in ANSI B4.1 (e.g., h9, g6, etc.) have the same nomenclature as in ISO 286. It could lead a confusion since the ANSI standard also defines the fundamental deviations and the tolerance grade on its own. The ANSI tolerancing system is nearly the same as the ISO 286 but not identical. If you take the values from the standard ISO charts or use our Online Calculator, you should expect about 0.1-0.5 thous errors.ClassificationHole BasisShaft BasisDescriptionClearanceH11/c11C11/h11Loose running fit for wide commercial tolerances or allowances on external members.H9/d9D9/h9Free running fit not for use where accuracy is essential, but good for large temperature variations, high running speeds, or heavy journal pressures.H8/f7F8/h7Close running fit for running on accurate machines and for accurate location at moderate speeds and journal pressures.H7/g6G7/h6Sliding fit not intended to run freely, but to move and turn freely and locate accurately.H7/h6H7/h6Locational clearance fit provides snug fit for locating stationary parts; but can be freely assembled and disassembled.InterferenceH7/k6K7/h6Locational transition fit for accurate location, a compromise between clearance and interference.H7/n6N7/h6Locational transition fit for more accurate location where greater interference is permissible.TransitionH7/p6P7/h6Locational interference fit for parts requiring rigidity and alignment with prime accuracy of location but without special bore pressure requirements.H7/s6S7/h6Medium drive fit for ordinary steel parts or shrink fits on light sections, the tightest fit usable with cast iron.H7/u6U7/h6Force fit suitable for parts which can be highly stressed or for shrink fits where the heavy pressing forces required are impractical.Related Glossary Terms:Thou

The biggest advantage of boron is that a small amount can be added to get the same result as other elements required in large amount in terms of added hardenability. Typical range in steel alloys is 0.0005 to 0.003%.

Ti is used to control grain size growth, which improves toughness. Also transforms sulfide inclusions form elongated to globular, improving strength and corrosion resistance as well as toughness and ductility.

About the Machining DoctorAt Machining Doctor, our mission is to serve the machining industry as a comprehensive and reliable source of technical information. We strive to be the go-to destination for professionals in the niche seeking information, knowledge, and expertise. Learn More

If you are in steel industry, have you ever notice what all those chemical composition listed on a steel materials test report really mean? You may only know different steel grade has many different chemical composition and elements in different amount. Here in this post, we sort out and list 21 chemical elements and effects on steel properties.

When boron is added to steel, precaution must be taken to ensure that it does not react with oxygen or nitrogen as the combination of boron with either one of the two will make the boron useless.

(*) In North America, additional fit combinations are sometimes used per ANSI B4.1 & B4.2. You can find below the ISO charts also the ANSI Charts.Click the Fit Link (e.g. G7/h6 ➢) to get its detailed tolerances in both Inch and millimetersHole Basis Fits (ISO 286-1)fit_typeFitFit LevelPreferedc_idfit_sortFit typeLeveliH10/b9 ➢DGNC1Clearance Fit6.00iH11/b11 ➢DGYC1Clearance Fit6.00iH10/c9 ➢DGNC1Clearance Fit5.00iH11/c11 ➢DGYC1Clearance Fit5.00iH8/d8 ➢GRNC1Clearance Fit4.00iH9/d8 ➢GRNC1Clearance Fit4.00iH10/d9 ➢GRYC1Clearance Fit4.00iH11/d10 ➢GRNC1Clearance Fit4.00iH10/e9 ➢GRNC1Clearance Fit3.00iH9/e8 ➢GRYC1Clearance Fit3.00iH8/e8 ➢GRYC1Clearance Fit3.00iH8/e7 ➢GRNC1Clearance Fit3.00iH7/f6 ➢LGNC1Clearance Fit2.00iH9/f8 ➢LGNC1Clearance Fit2.00iH8/f8 ➢LGNC1Clearance Fit2.00iH8/f7 ➢LGYC1Clearance Fit2.00iH7/g6 ➢LGYC1Clearance Fit1.00iH6/g5 ➢LGNC1Clearance Fit1.00iH10/h9 ➢LGYC1Clearance Fit0.00iH11/h10 ➢LGNC1Clearance Fit0.00iH9/h8 ➢LGNC1Clearance Fit0.00iH8/h8 ➢LGNC1Clearance Fit0.00iH6/h5 ➢LGNC1Clearance Fit0.00iH7/h6 ➢LGYC1Clearance Fit0.00iH8/h7 ➢LGYC1Clearance Fit-1.00iH6/js5 ➢orNT2Transition Fit-1.00iH7/js6 ➢orYT2Transition Fit-1.00iH8/k7 ➢orNT2Transition Fit-3.00iH6/k5 ➢orNT2Transition Fit-3.00iH7/k6 ➢orYT2Transition Fit-3.00iH7/m6 ➢orNT2Transition Fit-5.00iH6/m5 ➢orNT2Transition Fit-5.00iH8/m7 ➢orNT2Transition Fit-5.00iH7/n6 ➢orYT2Transition Fit-6.00iH8/js7 ➢orNT2Transition Fit-11.00iH6/n5 ➢LRNI3Press Fit (Interference)-6.00iH7/p6 ➢LRYI3Press Fit (Interference)-8.00iH6/p5 ➢LRNI3Press Fit (Interference)-8.00iH7/r6 ➢LRYI3Press Fit (Interference)-10.00iH7/s6 ➢RDYI3Press Fit (Interference)-11.00iH8/s7 ➢RDNI3Press Fit (Interference)-11.00iH7/t6 ➢RDNI3Press Fit (Interference)-12.00iH7/u6 ➢DRNI3Press Fit (Interference)-13.00iH8/u7 ➢DRNI3Press Fit (Interference)-13.00iH7/x6 ➢DRNI3Press Fit (Interference)-16.00Shaft Basis Fits (ISO 286-1)fit_typeFitFit LevelPreferedc_idfit_sortFit typeLeveliH10/b9 ➢DGNC1Clearance Fit6.00iH11/b11 ➢DGYC1Clearance Fit6.00iH10/c9 ➢DGNC1Clearance Fit5.00iH11/c11 ➢DGYC1Clearance Fit5.00iH8/d8 ➢GRNC1Clearance Fit4.00iH9/d8 ➢GRNC1Clearance Fit4.00iH10/d9 ➢GRYC1Clearance Fit4.00iH11/d10 ➢GRNC1Clearance Fit4.00iH10/e9 ➢GRNC1Clearance Fit3.00iH9/e8 ➢GRYC1Clearance Fit3.00iH8/e8 ➢GRYC1Clearance Fit3.00iH8/e7 ➢GRNC1Clearance Fit3.00iH7/f6 ➢LGNC1Clearance Fit2.00iH9/f8 ➢LGNC1Clearance Fit2.00iH8/f8 ➢LGNC1Clearance Fit2.00iH8/f7 ➢LGYC1Clearance Fit2.00iH7/g6 ➢LGYC1Clearance Fit1.00iH6/g5 ➢LGNC1Clearance Fit1.00iH10/h9 ➢LGYC1Clearance Fit0.00iH11/h10 ➢LGNC1Clearance Fit0.00iH9/h8 ➢LGNC1Clearance Fit0.00iH8/h8 ➢LGNC1Clearance Fit0.00iH6/h5 ➢LGNC1Clearance Fit0.00iH7/h6 ➢LGYC1Clearance Fit0.00iH8/h7 ➢LGYC1Clearance Fit-1.00iH6/js5 ➢orNT2Transition Fit-1.00iH7/js6 ➢orYT2Transition Fit-1.00iH8/k7 ➢orNT2Transition Fit-3.00iH6/k5 ➢orNT2Transition Fit-3.00iH7/k6 ➢orYT2Transition Fit-3.00iH7/m6 ➢orNT2Transition Fit-5.00iH6/m5 ➢orNT2Transition Fit-5.00iH8/m7 ➢orNT2Transition Fit-5.00iH7/n6 ➢orYT2Transition Fit-6.00iH8/js7 ➢orNT2Transition Fit-11.00iH6/n5 ➢LRNI3Press Fit (Interference)-6.00iH7/p6 ➢LRYI3Press Fit (Interference)-8.00iH6/p5 ➢LRNI3Press Fit (Interference)-8.00iH7/r6 ➢LRYI3Press Fit (Interference)-10.00iH7/s6 ➢RDYI3Press Fit (Interference)-11.00iH8/s7 ➢RDNI3Press Fit (Interference)-11.00iH7/t6 ➢RDNI3Press Fit (Interference)-12.00iH7/u6 ➢DRNI3Press Fit (Interference)-13.00iH8/u7 ➢DRNI3Press Fit (Interference)-13.00iH7/x6 ➢DRNI3Press Fit (Interference)-16.00Fit Combinations Per ANSI B4.1The tolerance classes mentioned in ANSI B4.1 (e.g., h9, g6, etc.) have the same nomenclature as in ISO 286. It could lead a confusion since the ANSI standard also defines the fundamental deviations and the tolerance grade on its own. The ANSI tolerancing system is nearly the same as the ISO 286 but not identical. If you take the values from the standard ISO charts or use our Online Calculator, you should expect about 0.1-0.5 thous errors. wdt_IDFit NameTolerance Class CombinationFit Typeth1RC 1H5/g4Running or Slidining Fits52RC 2H6/g5Running or Slidining Fits63RC 3H7/f6Running or Slidining Fits74RC 4H8/f7Running or Slidining Fits85RC 5H8/e7Running or Slidining Fits86RC 6H9/e8Running or Slidining Fits97RC 7H9/d8Running or Slidining Fits98RC 8H10/c9Running or Slidining Fits109RC 9H11/sh1Running or Slidining Fits1110LC 1H6/h5Clearance Location Fits611LC 2H7/h6Clearance Location Fits712LC 3H8/h7Clearance Location Fits813LC 4H10/h9Clearance Location Fits1014LC 5H7/g6Clearance Location Fits715LC 6H9/f8Clearance Location Fits916LC 7H10/e9Clearance Location Fits1017LC 8H10/d9Clearance Location Fits1018LC 9H11/c10Clearance Location Fits1119LC 10H12/sh2Clearance Location Fits1220LC 11H13/sh3Clearance Location Fits1321LT 1H7/js6Transition Fits722LT 2H8/js7Transition Fits823LT 3H7/k6Transition Fits724LT 4H8/k7Transition Fits825LT 5H7/n6Transition Fits726LT 6H7/n7Transition Fits727LN 1H6/n5Interference Location Fits628LN 2H7/p6Interference Location Fits729LN 3H7/r6Interference Location Fits730FN 1H6/sh4Force or Shrink Fits631FN 2H7/s6Force or Shrink Fits732FN 3H7/t6Force or Shrink Fits733FN 4H7/u6Force or Shrink Fits734FN 5H8/x7Force or Shrink Fits8Fit Combinations Per ANSI B4.2The tolerance classes mentioned in ANSI B4.1 (e.g., h9, g6, etc.) have the same nomenclature as in ISO 286. It could lead a confusion since the ANSI standard also defines the fundamental deviations and the tolerance grade on its own. The ANSI tolerancing system is nearly the same as the ISO 286 but not identical. If you take the values from the standard ISO charts or use our Online Calculator, you should expect about 0.1-0.5 thous errors.ClassificationHole BasisShaft BasisDescriptionClearanceH11/c11C11/h11Loose running fit for wide commercial tolerances or allowances on external members.H9/d9D9/h9Free running fit not for use where accuracy is essential, but good for large temperature variations, high running speeds, or heavy journal pressures.H8/f7F8/h7Close running fit for running on accurate machines and for accurate location at moderate speeds and journal pressures.H7/g6G7/h6Sliding fit not intended to run freely, but to move and turn freely and locate accurately.H7/h6H7/h6Locational clearance fit provides snug fit for locating stationary parts; but can be freely assembled and disassembled.InterferenceH7/k6K7/h6Locational transition fit for accurate location, a compromise between clearance and interference.H7/n6N7/h6Locational transition fit for more accurate location where greater interference is permissible.TransitionH7/p6P7/h6Locational interference fit for parts requiring rigidity and alignment with prime accuracy of location but without special bore pressure requirements.H7/s6S7/h6Medium drive fit for ordinary steel parts or shrink fits on light sections, the tightest fit usable with cast iron.H7/u6U7/h6Force fit suitable for parts which can be highly stressed or for shrink fits where the heavy pressing forces required are impractical.Related Glossary Terms:Thou

The most commonly used tolerancing system for shafts and holes is detailed in ISO 286-1 & 286-2. The first provides the charts for the fundamental deviations (G, j, etc.) and tolerance grades (7, 8, 9, etc.), out of which the limits of the tolerance classes (H7, g6, etc.) can be calculated. ISO 286-2 is a collection of dozens of charts that tabulate the size limits for all the tolerance grades. The figures listed in ISO 286-2 are calculated based on ISO 286-1 and can also be obtained independently. A thorough understanding of the basic terminology is critical for a solid understanding of the data provided by our calculator and charts.Pay attention that some of the terms have a somewhat different meaning within the tolerancing system (Compared to its general meaning in mechanical engineering!)TerminologyBasic Size (Also may be called nominal size)Nominal size is the dimension by which a feature is identified for convenience. It is also the point from which the limits are derived by application of the necessary deviation and tolerance (See explanation below). For example, a slot whose actual width is 25.15 mm would be known as a 25-mm wide slot.Limits of SizeLimits are the basic size’s high (Upper limit) and low (Lower limit) values. For example, if the lower limit of a hole is 25.05 mm and the upper limit of the same hole is 25.15 mm, then a hole that is 25.1 mm in diameter is within limits and is acceptable. The limits are the final result obtained from the tolerance system based on the nominal size and tolerance class.ShaftShaft refers to an external feature of a workpiece, typically cylindrical in shape. However, the term can be used to describe any external feature. For example, a block that has to fit into a keyway or the square shank of a cutting tool can also be referred to as a shaft.HoleHole refers to an internal feature of a workpiece, typically a bore. However, the term can be used to describe any internal feature. For example, a keyway.Fundamental DeviationFundamental Deviation is The position of the tolerance zone in relation to the zero line (Also referred to as basic size or nominal size). The fundamental deviation is measured to the point that is nearest to the zero line. A 1-2 character letter code (e.g. G, js, are used to indicate it. Holes are marked by capital letters, and shafts by small letters. For example, “G” is a fundamental deviation of a hole, and “js” is a fundamental deviation of a shaft.The size of the deviation depends on its letter code and the nominal size.Values are listed in the below table.Check out our below infographic for easier understanding.Upper & lower DeviationsThe algebraic difference between the upper limit and the basic size is called the upper deviation and is denoted by es for shafts and ES for holes. The algebraic difference between the lower limit and the basic size is called the lower deviation and is represented by ei for shafts and EI for holes. The configurations may be confusing and depend if the feature is external or internal and if the deviation is negative, positive, or zero.Deviation SymbolA-GHes=0,ei=ITEI=0, ES=ITJSei=es=IT/2EI=ES=IT/2K-ZToleranceTolerance is the difference between the limits of size. That is the upper limit minus the lower limit.Standard Tolerance Grade: A number between 0 to 18 and designated as “IT” (e.g. IT7). A lower IT means higher accuracy. The value of each IT also depends on the basic size. You can find the values in the below chart.The IS0 system provides 20 standard tolerance grades, of which IT1 to IT18 are considered general use. In addition, there are two complementary grades, IT01 and IT0. The collection of charts provided in ISO 286-2 covers only IT1-IT18.Tolerance Class: The term used for the combination of a fundamental deviation with a standard tolerance grade, e.g. h9, D13, etc.All the above terms are summarized in the below infographics(*) Click to enlargeNomenclatureStandard Tolerance GradesThe standard tolerance grades are designated by the letters IT followed by a number, for example, IT7. When the tolerance grade is associated with a fundamental deviation symbol to form a tolerance class, the letters IT are omitted (e.g., h7, JS5)Fundamental DeviationA 1-2 letter code represents the fundamental deviation. Upper case (e.g., G, JS) designates hole deviations, while lower case (e.g., g, js) designates shaft deviations.Tolerance ClassThe tolerance class is designated by the letter(s) representing the fundamental deviation followed by the standard tolerance grade number. For example, a shaft with a deviation of g and a tolerance grade of T11 will be denoted as g11. A hole with a deviation of JS and a tolerance grade of IT7 will be represented as JS7.Tolerance SizeThe tolerance size combines the basic size with the tolerance class, designated by the basic size, followedby the designation of the required tolerance class (without spaces). For example, 32H7 specifies a hole with a nominal size of 32 mm, deviation H, and tolerance grade of IT7.Tolerances ChartsStandard Tolerance Grades (IT) ChartTolerance Dimensions in MicronsTo convert to millimeters, divide by 1000To convert to Thous, divide by 25.4 wdt_IDDiameter Range (mm)(Inches)IT01IT0IT1IT2IT3IT4IT5IT6IT7IT8IT9IT10IT11IT12IT13IT14IT15IT16IT17IT1810 - 30 - 0.120.30.50.81.2234610142540601001402504006001000140023 - 60.12 - 0.240.40.611.52.545812183048751201803004807501200180036 - 100.24 - 0.40.40.611.52.5469152236589015022036058090015002200410 - 180.4 - 0.710.50.81.223581118274370110180270430700110018002700518 - 300.71 - 1.190.611.52.54691321335284130210330520840130021003300630 - 501.19 - 1.970.611.52.54711162539621001602503906201000160025003900750 - 801.97 - 3.150.81.2235813193046741201903004607401200190030004600880 - 1203.15 - 4.7311.52.54610152235548714022035054087014002200350054009120 - 1804.73 - 7.091.223.55812182540631001602504006301000160025004000630010180 - 2507.09 - 9.85234.571014202946721151852904607201150185029004600720011250 - 3159.85 - 12.412.54681216233252811302103205208101300210032005200810012315 - 40012.41 - 15.7535791318253657891402303605708901400230036005700890013400 - 50015.75 - 19.7468101520274063971552504006309701550250040006300970014500 - 63019.7 - 24.84.569111622324470110175280440700110017502800440070001100015630 - 80024.8 - 31.55710131825365080125200320500800125020003200500080001250016800 - 100031.5 - 39.45.58111521284056901402303605609001400230036005600900014000171000 - 125039.4 - 49.26.59131824334766105165260420660105016502600420066001050016500181250 - 160049.2 - 63811152129395578125195310500780125019503100500078001250019500191600 - 200063 - 78.7913182535466592150230370600920150023003700600092001500023000202000 - 250078.7 - 98.4111522304155781101752804407001100175028004400700011001750028000212500 - 315098.4 - 1241318263650689613521033054086013502100330054008600135002100033000Fundamental deviation of holes ChartClick the Tolerance Link (e.g., H ➢) to get the Full & Accurate charts for a specific deviation in Inch and Metric unitsClick  icons to show all columns for the entire diameter range (0-3,150 mm)The deviations of J through Z also depend on the IT Therefore, the values in the below table are only accurate in some cases. To get the correct value in all cases, click the Tolerance Link (e.g., H ➢).Dimentions in Microns. To convert to millimeters, divide by 1000, to Thous, divide by 25.4 Deviationidurl0 - 3 mm3 - 6 mm6 - 1010 - 1414 - 1818 - 2424 - 3030 - 4040 - 5050 - 6565 - 8080 - 100100 - 120120 - 140140 - 160160 - 180180 - 200200 - 225225 - 250250 - 280280 - 315315 - 355355 - 400400 - 450450 - 500500 - 560560 - 630630 - 710710 - 800800 - 900900 - 10001000 - 11201120 - 12501250 - 14001400 - 16001600 - 18001800 - 20002000 - 22402240 - 25002500 - 28002800 - 3150A ➢1calculators/tolerances/tol?dev=a||A ➢27027028029029030030031032034036038041046052058066074082092010501200135015001650XXXXXXXXXXXXXXXXB ➢2calculators/tolerances/tol?dev=b||B ➢140140150150150160160170180190200220240260280310340380420480540600680760840XXXXXXXXXXXXXXXXC ➢3calculators/tolerances/tol?dev=c||C ➢6070809595110110120130140150170180200210230240260280300330360400440480520580640700780860940105011501300145016001800200022002500CD ➢4calculators/tolerances/tol?dev=cd||CD ➢344656XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXD ➢5calculators/tolerances/tol?dev=d||D ➢203040505065658080100100120120145145145170170170190190210210230230260260290290320320350350390390430430480480520520E ➢6calculators/tolerances/tol?dev=e||E ➢14202532324040505060607272858585100100100110110125125135135145145160160170170195195220220240240260260290290EF ➢7calculators/tolerances/tol?dev=ef||EF ➢101418XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXF ➢8calculators/tolerances/tol?dev=f||F ➢61013161620202525303036364343435050505656626268687676808086869898110110120120130130145145FG ➢9calculators/tolerances/tol?dev=fg||FG ➢468XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXG ➢10calculators/tolerances/tol?dev=g||G ➢2456677991010121214141415151517171818202022222424262628283030323234343838H ➢11calculators/tolerances/tol?dev=h||H ➢00000000000000000000000000000000000000000JS ➢12calculators/tolerances/tol?dev=js||JS ➢00000000000000000000000000000000000000000J ➢13calculators/tolerances/tol?dev=j||J ➢46810101212141418182222262626303030363639394343XXXXXXXXXXXXXXXXK ➢14calculators/tolerances/tol?dev=k||K ➢0-1-1-1-1-2-2-2-2-2-2-3-3-3-3-3-4-4-4-4-4-4-4-5-50000000000000000M ➢15calculators/tolerances/tol?dev=m||M ➢-2-4-6-7-7-8-8-9-9-11-11-13-13-15-15-15-17-17-17-20-20-21-21-23-23-26-26-30-30-34-34-40-40-48-48-58-58-68-68-76-76N ➢16calculators/tolerances/tol?dev=n||N ➢-4-8-10-12-12-15-15-17-17-20-20-23-23-27-27-27-31-31-31-34-34-37-37-40-40-44-44-50-50-56-56-66-66-78-78-92-92-110-110-135-135P ➢17calculators/tolerances/tol?dev=p||P ➢-6-12-15-18-18-22-22-26-26-32-32-37-37-43-43-43-50-50-50-56-56-62-62-68-68-78-78-88-88-100-100-120-120-140-140-170-170-195-195-240-240R ➢18calculators/tolerances/tol?dev=r||R ➢-10-15-19-23-23-28-28-34-34-41-43-51-54-63-65-68-77-80-84-94-98-108-114-126-132-150-155-175-185-210-220-250-260-300-330-370-400-440-460-550-580S ➢19calculators/tolerances/tol?dev=s||S ➢-14-19-23-28-28-35-35-43-43-53-59-71-79-92-100-108-122-130-140-158-170-190-208-232-252-280-310-340-380-430-470-520-580-640-720-820-920-1000-1100-1250-1400T ➢20calculators/tolerances/tol?dev=t||T ➢000XXX-41-48-54-66-75-91-104-122-134-146-166-180-196-218-240-268-294-330-360-400-450-500-560-620-680-780-840-960-1050-1200-1350-1500-1650-1900-2100U ➢21calculators/tolerances/tol?dev=u||U ➢-18-23-28-33-33-41-48-60-70-87-102-124-144-170-190-210-236-258-284-315-350-390-435-490-540-600-660-740-840-940-1050-1150-1300-1450-1600-1850-2000-2300-2500-2900-3200V ➢22calculators/tolerances/tol?dev=v||V ➢000X-39-47-55-68-81-102-120-146-172-202-228-252-284-310-340-385-425-475-530-595-660-740-820-920-1000-1150-1300-1450-1600-1800-2000-2300-2500-2800-3100-3500-3900X ➢23calculators/tolerances/tol?dev=x||X ➢-20-28-34-40-45-54-64-80-97-122-146-178-210-248-280-310-340-385-425-475-525-590-660-740-820XXXXXXXXXXXXXXXXY ➢24calculators/tolerances/tol?dev=y||Y ➢000XX-63-75-94-114-144-174-214-254-300-340-380-425-470-520-580-650-730-820-920-1000XXXXXXXXXXXXXXXXZ ➢25calculators/tolerances/tol?dev=z||Z ➢-26-35-42-50-60-73-88-112-136-172-210-258-310-365-415-465-520-575-640-710-790-900-1000-1100-1250XXXXXXXXXXXXXXXXZA ➢26calculators/tolerances/tol?dev=za||ZA ➢-32-42-52-64-77-98-118-148-180-226-274-335-400-470-535-600-670-740-820-920-1000-1150-1300-1450-1600XXXXXXXXXXXXXXXXFundamental deviation of shafts ChartClick the Tolerance Link (e.g., g ➢) to get the Full & Accurate charts for a specific deviation in Inch and Metric unitsClick  icons to show all columns of the entire diameter range (0-3,150 mm)The deviations of J through Z also depend on the IT Therefore, the values in the below table are only accurate in some cases. To get the correct value in all cases, click the Tolerance Link (e.g., g ➢).Dimentions in Microns. To convert to millimeters, divide by 1000, to Thous, divide by 25.4 Deviationidurl0 - 3 mm3 - 6 mm6 - 1010 - 1414 - 1818 - 2424 - 3030 - 4040 - 5050 - 6565 - 8080 - 100100 - 120120 - 140140 - 160160 - 180180 - 200200 - 225225 - 250250 - 280280 - 315315 - 355355 - 400400 - 450450 - 500500 - 560560 - 630630 - 710710 - 800800 - 900900 - 10001000 - 11201120 - 12501250 - 14001400 - 16001600 - 18001800 - 20002000 - 22402240 - 25002500 - 28002800 - 3150a ➢1calculators/tolerances/tol?dev=a||A ➢-270-270-280-290-290-300-300-310-320-340-360-380-410-460-520-580-660-740-820-920-1050-1200-1350-1500-1650XXXXXXXXXXXXXXXXb ➢2calculators/tolerances/tol?dev=b||B ➢-140-140-150-150-150-160-160-170-180-190-200-220-240-260-280-310-340-380-420-480-540-600-680-760-840XXXXXXXXXXXXXXXXc ➢3calculators/tolerances/tol?dev=c||C ➢-60-70-80-95-95-110-110-120-130-140-150-170-180-200-210-230-240-260-280-300-330-360-400-440-480-520-580-640-700-780-860-940-1050-1150-1300-1450-1600-1800-2000-2200-2500cd ➢4calculators/tolerances/tol?dev=cd||CD ➢-34-46-56XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXd ➢5calculators/tolerances/tol?dev=d||D ➢-20-30-40-50-50-65-65-80-80-100-100-120-120-145-145-145-170-170-170-190-190-210-210-230-230-260-260-290-290-320-320-350-350-390-390-430-430-480-480-520-520e ➢6calculators/tolerances/tol?dev=e||E ➢-14-20-25-32-32-40-40-50-50-60-60-72-72-85-85-85-100-100-100-110-110-125-125-135-135-145-145-160-160-170-170-195-195-220-220-240-240-260-260-290-290ef ➢7calculators/tolerances/tol?dev=ef||EF ➢-10-14-18XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXf ➢8calculators/tolerances/tol?dev=f||F ➢-6-10-13-16-16-20-20-25-25-30-30-36-36-43-43-43-50-50-50-56-56-62-62-68-68-76-76-80-80-86-86-98-98-110-110-120-120-130-130-145-145fg ➢9calculators/tolerances/tol?dev=fg||FG ➢-4-6-8XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXg ➢10calculators/tolerances/tol?dev=g||G ➢-2-4-5-6-6-7-7-9-9-10-10-12-12-14-14-14-15-15-15-17-17-18-18-20-20-22-22-24-24-26-26-28-28-30-30-32-32-34-34-38-38h ➢11calculators/tolerances/tol?dev=h||H ➢00000000000000000000000000000000000000000js ➢12calculators/tolerances/tol?dev=js||JS ➢00000000000000000000000000000000000000000j ➢13calculators/tolerances/tol?dev=j||J ➢-4-6-8-10-10-12-12-14-14-18-18-22-22-26-26-26-30-30-30-36-36-39-39-43-43XXXXXXXXXXXXXXXXk ➢14calculators/tolerances/tol?dev=k||K ➢01111222222333334444444550000000000000000m ➢15calculators/tolerances/tol?dev=m||M ➢2467788991111131315151517171720202121232326263030343440404848585868687676n ➢16calculators/tolerances/tol?dev=n||N ➢481012121515171720202323272727313131343437374040444450505656666678789292110110135135p ➢17calculators/tolerances/tol?dev=p||P ➢612151818222226263232373743434350505056566262686878788888100100120120140140170170195195240240r ➢18calculators/tolerances/tol?dev=r||R ➢101519232328283434414351546365687780849498108114126132150155175185210220250260300330370400440460550580s ➢19calculators/tolerances/tol?dev=s||S ➢14192328283535434353597179921001081221301401581701902082322522803103403804304705205806407208209201000110012501400t ➢20calculators/tolerances/tol?dev=t||T ➢000XXX4148546675911041221341461661801962182402682943303604004505005606206807808409601050120013501500165019002100u ➢21calculators/tolerances/tol?dev=u||U ➢1823283333414860708710212414417019021023625828431535039043549054060066074084094010501150130014501600185020002300250029003200v ➢22calculators/tolerances/tol?dev=v||V ➢000X39475568811021201461722022282522843103403854254755305956607408209201000115013001450160018002000230025002800310035003900x ➢23calculators/tolerances/tol?dev=x||X ➢202834404554648097122146178210248280310340385425475525590660740820XXXXXXXXXXXXXXXXy ➢24calculators/tolerances/tol?dev=y||Y ➢000XX6375941141441742142543003403804254705205806507308209201000XXXXXXXXXXXXXXXXz ➢25calculators/tolerances/tol?dev=z||Z ➢26354250607388112136172210258310365415465520575640710790900100011001250XXXXXXXXXXXXXXXXza ➢26calculators/tolerances/tol?dev=za||ZA ➢32425264779811814818022627433540047053560067074082092010001150130014501600XXXXXXXXXXXXXXXXEngineering FitsEngineering fit refers to the degree of tightness or looseness between two mating parts in an assembly. It is defined by combining a hole with a tolerance class and a shaft with a tolerance class. (See definition of terms above).Several standards define recommended pairings for different applications. The values presented in our charts and Calculator are based on ISO 286-1:2010 (In earlier revisions, it was separated into ISO 1829, which is now obsolete). In North America, additional fit combinations are sometimes used per ANSI B4.1 & B4.2. The ANSI tolerancing system is nearly equivalent to ISO 286 but not identical. The difference is typically 0.1-0.5 thous.Main Fit TypesClearance FitA clearance fit is a type in which the shaft is smaller than the hole it is inserted into, allowing for free movement, assembly, and disassembly. Clearance fits can range from loose-running for assemblies that need a significant gap for free movement or to accommodate temperature variation to locational clearance for stationary parts that need to be freely assembled/disassembled but still maintain accuracy.Transition FitA transition fit is a type in which the shaft may be slightly smaller or larger than the hole (before assembly). It is used to create a tight and secure connection between them in applications requiring high precision and stability. It provides high accuracy, but the connecting parts can be disassembled and reassembled without damage. However, force cannot be transmitted.Press Fit (Interference)An interference (Press) fit is a type in which the shaft is larger than the hole (before assembly). It creates a frictional force that holds the parts together without the need for additional fasteners or adhesives. The interference fit is commonly used in mechanical engineering to create solid and reliable connections between components that need to withstand heavy loads or vibrations. However, It is hard to disassemble without damaging the parts. Some degree of force can be transmitted between the components.Fits are also divided into two types of “basis”There are no technical differences between the two basis. Therefore the choice of the system should be based on economic reasons.Hole Basis FitsThe hole deviation is zero (meaning an H), and the shaft deviation varies to create different fit levels. For example, H9/d8 , H7/g6. It is the first choice of combinations for general use, since it avoids an unnecessary multiplicity of tools (e.g., reamers) and gaugesShaft Basis FitsThe shaft deviation is zero (meaning an h), and the hole deviation varies to create different fit levels. For example, D9/h9, G7/h6. This method should only be utilized when it offers clear economic benefits, such as in situations where it is required to assemble multiple parts with holes that have varying deviations onto a single shaft.Fits Standard Combinations ChartsFor ordinary engineering purposes, only a small number of the many (~150,000) possible fit combinations is required. ISO 286-1:2010 lists about 80 fit combinations that meet most of the needs of any engineering task. You can choose from this list or define a custom combination in our Fit Calculator.(*) In North America, additional fit combinations are sometimes used per ANSI B4.1 & B4.2. You can find below the ISO charts also the ANSI Charts.Click the Fit Link (e.g. G7/h6 ➢) to get its detailed tolerances in both Inch and millimetersHole Basis Fits (ISO 286-1)fit_typeFitFit LevelPreferedc_idfit_sortFit typeLeveliH10/b9 ➢DGNC1Clearance Fit6.00iH11/b11 ➢DGYC1Clearance Fit6.00iH10/c9 ➢DGNC1Clearance Fit5.00iH11/c11 ➢DGYC1Clearance Fit5.00iH8/d8 ➢GRNC1Clearance Fit4.00iH9/d8 ➢GRNC1Clearance Fit4.00iH10/d9 ➢GRYC1Clearance Fit4.00iH11/d10 ➢GRNC1Clearance Fit4.00iH10/e9 ➢GRNC1Clearance Fit3.00iH9/e8 ➢GRYC1Clearance Fit3.00iH8/e8 ➢GRYC1Clearance Fit3.00iH8/e7 ➢GRNC1Clearance Fit3.00iH7/f6 ➢LGNC1Clearance Fit2.00iH9/f8 ➢LGNC1Clearance Fit2.00iH8/f8 ➢LGNC1Clearance Fit2.00iH8/f7 ➢LGYC1Clearance Fit2.00iH7/g6 ➢LGYC1Clearance Fit1.00iH6/g5 ➢LGNC1Clearance Fit1.00iH10/h9 ➢LGYC1Clearance Fit0.00iH11/h10 ➢LGNC1Clearance Fit0.00iH9/h8 ➢LGNC1Clearance Fit0.00iH8/h8 ➢LGNC1Clearance Fit0.00iH6/h5 ➢LGNC1Clearance Fit0.00iH7/h6 ➢LGYC1Clearance Fit0.00iH8/h7 ➢LGYC1Clearance Fit-1.00iH6/js5 ➢orNT2Transition Fit-1.00iH7/js6 ➢orYT2Transition Fit-1.00iH8/k7 ➢orNT2Transition Fit-3.00iH6/k5 ➢orNT2Transition Fit-3.00iH7/k6 ➢orYT2Transition Fit-3.00iH7/m6 ➢orNT2Transition Fit-5.00iH6/m5 ➢orNT2Transition Fit-5.00iH8/m7 ➢orNT2Transition Fit-5.00iH7/n6 ➢orYT2Transition Fit-6.00iH8/js7 ➢orNT2Transition Fit-11.00iH6/n5 ➢LRNI3Press Fit (Interference)-6.00iH7/p6 ➢LRYI3Press Fit (Interference)-8.00iH6/p5 ➢LRNI3Press Fit (Interference)-8.00iH7/r6 ➢LRYI3Press Fit (Interference)-10.00iH7/s6 ➢RDYI3Press Fit (Interference)-11.00iH8/s7 ➢RDNI3Press Fit (Interference)-11.00iH7/t6 ➢RDNI3Press Fit (Interference)-12.00iH7/u6 ➢DRNI3Press Fit (Interference)-13.00iH8/u7 ➢DRNI3Press Fit (Interference)-13.00iH7/x6 ➢DRNI3Press Fit (Interference)-16.00Shaft Basis Fits (ISO 286-1)fit_typeFitFit LevelPreferedc_idfit_sortFit typeLeveliH10/b9 ➢DGNC1Clearance Fit6.00iH11/b11 ➢DGYC1Clearance Fit6.00iH10/c9 ➢DGNC1Clearance Fit5.00iH11/c11 ➢DGYC1Clearance Fit5.00iH8/d8 ➢GRNC1Clearance Fit4.00iH9/d8 ➢GRNC1Clearance Fit4.00iH10/d9 ➢GRYC1Clearance Fit4.00iH11/d10 ➢GRNC1Clearance Fit4.00iH10/e9 ➢GRNC1Clearance Fit3.00iH9/e8 ➢GRYC1Clearance Fit3.00iH8/e8 ➢GRYC1Clearance Fit3.00iH8/e7 ➢GRNC1Clearance Fit3.00iH7/f6 ➢LGNC1Clearance Fit2.00iH9/f8 ➢LGNC1Clearance Fit2.00iH8/f8 ➢LGNC1Clearance Fit2.00iH8/f7 ➢LGYC1Clearance Fit2.00iH7/g6 ➢LGYC1Clearance Fit1.00iH6/g5 ➢LGNC1Clearance Fit1.00iH10/h9 ➢LGYC1Clearance Fit0.00iH11/h10 ➢LGNC1Clearance Fit0.00iH9/h8 ➢LGNC1Clearance Fit0.00iH8/h8 ➢LGNC1Clearance Fit0.00iH6/h5 ➢LGNC1Clearance Fit0.00iH7/h6 ➢LGYC1Clearance Fit0.00iH8/h7 ➢LGYC1Clearance Fit-1.00iH6/js5 ➢orNT2Transition Fit-1.00iH7/js6 ➢orYT2Transition Fit-1.00iH8/k7 ➢orNT2Transition Fit-3.00iH6/k5 ➢orNT2Transition Fit-3.00iH7/k6 ➢orYT2Transition Fit-3.00iH7/m6 ➢orNT2Transition Fit-5.00iH6/m5 ➢orNT2Transition Fit-5.00iH8/m7 ➢orNT2Transition Fit-5.00iH7/n6 ➢orYT2Transition Fit-6.00iH8/js7 ➢orNT2Transition Fit-11.00iH6/n5 ➢LRNI3Press Fit (Interference)-6.00iH7/p6 ➢LRYI3Press Fit (Interference)-8.00iH6/p5 ➢LRNI3Press Fit (Interference)-8.00iH7/r6 ➢LRYI3Press Fit (Interference)-10.00iH7/s6 ➢RDYI3Press Fit (Interference)-11.00iH8/s7 ➢RDNI3Press Fit (Interference)-11.00iH7/t6 ➢RDNI3Press Fit (Interference)-12.00iH7/u6 ➢DRNI3Press Fit (Interference)-13.00iH8/u7 ➢DRNI3Press Fit (Interference)-13.00iH7/x6 ➢DRNI3Press Fit (Interference)-16.00Fit Combinations Per ANSI B4.1The tolerance classes mentioned in ANSI B4.1 (e.g., h9, g6, etc.) have the same nomenclature as in ISO 286. It could lead a confusion since the ANSI standard also defines the fundamental deviations and the tolerance grade on its own. The ANSI tolerancing system is nearly the same as the ISO 286 but not identical. If you take the values from the standard ISO charts or use our Online Calculator, you should expect about 0.1-0.5 thous errors. wdt_IDFit NameTolerance Class CombinationFit Typeth1RC 1H5/g4Running or Slidining Fits52RC 2H6/g5Running or Slidining Fits63RC 3H7/f6Running or Slidining Fits74RC 4H8/f7Running or Slidining Fits85RC 5H8/e7Running or Slidining Fits86RC 6H9/e8Running or Slidining Fits97RC 7H9/d8Running or Slidining Fits98RC 8H10/c9Running or Slidining Fits109RC 9H11/sh1Running or Slidining Fits1110LC 1H6/h5Clearance Location Fits611LC 2H7/h6Clearance Location Fits712LC 3H8/h7Clearance Location Fits813LC 4H10/h9Clearance Location Fits1014LC 5H7/g6Clearance Location Fits715LC 6H9/f8Clearance Location Fits916LC 7H10/e9Clearance Location Fits1017LC 8H10/d9Clearance Location Fits1018LC 9H11/c10Clearance Location Fits1119LC 10H12/sh2Clearance Location Fits1220LC 11H13/sh3Clearance Location Fits1321LT 1H7/js6Transition Fits722LT 2H8/js7Transition Fits823LT 3H7/k6Transition Fits724LT 4H8/k7Transition Fits825LT 5H7/n6Transition Fits726LT 6H7/n7Transition Fits727LN 1H6/n5Interference Location Fits628LN 2H7/p6Interference Location Fits729LN 3H7/r6Interference Location Fits730FN 1H6/sh4Force or Shrink Fits631FN 2H7/s6Force or Shrink Fits732FN 3H7/t6Force or Shrink Fits733FN 4H7/u6Force or Shrink Fits734FN 5H8/x7Force or Shrink Fits8Fit Combinations Per ANSI B4.2The tolerance classes mentioned in ANSI B4.1 (e.g., h9, g6, etc.) have the same nomenclature as in ISO 286. It could lead a confusion since the ANSI standard also defines the fundamental deviations and the tolerance grade on its own. The ANSI tolerancing system is nearly the same as the ISO 286 but not identical. If you take the values from the standard ISO charts or use our Online Calculator, you should expect about 0.1-0.5 thous errors.ClassificationHole BasisShaft BasisDescriptionClearanceH11/c11C11/h11Loose running fit for wide commercial tolerances or allowances on external members.H9/d9D9/h9Free running fit not for use where accuracy is essential, but good for large temperature variations, high running speeds, or heavy journal pressures.H8/f7F8/h7Close running fit for running on accurate machines and for accurate location at moderate speeds and journal pressures.H7/g6G7/h6Sliding fit not intended to run freely, but to move and turn freely and locate accurately.H7/h6H7/h6Locational clearance fit provides snug fit for locating stationary parts; but can be freely assembled and disassembled.InterferenceH7/k6K7/h6Locational transition fit for accurate location, a compromise between clearance and interference.H7/n6N7/h6Locational transition fit for more accurate location where greater interference is permissible.TransitionH7/p6P7/h6Locational interference fit for parts requiring rigidity and alignment with prime accuracy of location but without special bore pressure requirements.H7/s6S7/h6Medium drive fit for ordinary steel parts or shrink fits on light sections, the tightest fit usable with cast iron.H7/u6U7/h6Force fit suitable for parts which can be highly stressed or for shrink fits where the heavy pressing forces required are impractical.Related Glossary Terms:Thou

2021414 — The best bits for drilling carbon fiber are solid carbide or diamond. These bits are very brittle though and should only be used in a rigid ...

Steel in general is an alloy of carbon and iron, it does contain many other elements, some of which are retained from the steel making process, other elements are added to produce specific properties. We can see some most common chemical elements with important effects on steel properties.

There are some other small rare metal elements which we don’t list in the above. You could leave a comment below, with details.

The machinability is improved in free-cutting steel, but weld brittle and/or weld cracks can occur during welding if the phosphorus content is more than 0.04%. Phosphorus also affects the thickness of the zinc layer when galvanising steel.

Hardness of steel depends upon the amount of MartensiteSteel is an alloy of iron and carbon, and its hardness is primarily determined by the amount of ...

These drill bits are made from grains of tungsten carbide, other material particles, and metal cobalt. If additives are not used, the carbide tool will ...

Chromium is a powerful alloying element in steel. Cr presents in certain structural steels in small amounts. It is primarily used to increase hardenability of steel and increase the corrosion resistance as well as the yield strength of the steel material. For that reason often occurs in combination with nickel and copper. Stainless steels may contain in excess of 12% chromium. The well-known “18-8” stainless steel contains 8 percent of nickel and 18 percent of chromium.

Flutes - 4 Center Cut. Finish / Coating - TiAIN. Length of Cut - 3/4".

In addition to its favorable effect on the corrosion resistance of steel, Ni is added to steels to increase hardenability. Nickel enhances the low-temperature behavior of the material by improving the fracture toughness. The weldability of the steel is not decreased by the presence of this element. The nickel drastically increases the notch toughness of the steel.

For ordinary engineering purposes, only a small number of the many (~150,000) possible fit combinations is required. ISO 286-1:2010 lists about 80 fit combinations that meet most of the needs of any engineering task. You can choose from this list or define a custom combination in our Fit Calculator.(*) In North America, additional fit combinations are sometimes used per ANSI B4.1 & B4.2. You can find below the ISO charts also the ANSI Charts.Click the Fit Link (e.g. G7/h6 ➢) to get its detailed tolerances in both Inch and millimetersHole Basis Fits (ISO 286-1)fit_typeFitFit LevelPreferedc_idfit_sortFit typeLeveliH10/b9 ➢DGNC1Clearance Fit6.00iH11/b11 ➢DGYC1Clearance Fit6.00iH10/c9 ➢DGNC1Clearance Fit5.00iH11/c11 ➢DGYC1Clearance Fit5.00iH8/d8 ➢GRNC1Clearance Fit4.00iH9/d8 ➢GRNC1Clearance Fit4.00iH10/d9 ➢GRYC1Clearance Fit4.00iH11/d10 ➢GRNC1Clearance Fit4.00iH10/e9 ➢GRNC1Clearance Fit3.00iH9/e8 ➢GRYC1Clearance Fit3.00iH8/e8 ➢GRYC1Clearance Fit3.00iH8/e7 ➢GRNC1Clearance Fit3.00iH7/f6 ➢LGNC1Clearance Fit2.00iH9/f8 ➢LGNC1Clearance Fit2.00iH8/f8 ➢LGNC1Clearance Fit2.00iH8/f7 ➢LGYC1Clearance Fit2.00iH7/g6 ➢LGYC1Clearance Fit1.00iH6/g5 ➢LGNC1Clearance Fit1.00iH10/h9 ➢LGYC1Clearance Fit0.00iH11/h10 ➢LGNC1Clearance Fit0.00iH9/h8 ➢LGNC1Clearance Fit0.00iH8/h8 ➢LGNC1Clearance Fit0.00iH6/h5 ➢LGNC1Clearance Fit0.00iH7/h6 ➢LGYC1Clearance Fit0.00iH8/h7 ➢LGYC1Clearance Fit-1.00iH6/js5 ➢orNT2Transition Fit-1.00iH7/js6 ➢orYT2Transition Fit-1.00iH8/k7 ➢orNT2Transition Fit-3.00iH6/k5 ➢orNT2Transition Fit-3.00iH7/k6 ➢orYT2Transition Fit-3.00iH7/m6 ➢orNT2Transition Fit-5.00iH6/m5 ➢orNT2Transition Fit-5.00iH8/m7 ➢orNT2Transition Fit-5.00iH7/n6 ➢orYT2Transition Fit-6.00iH8/js7 ➢orNT2Transition Fit-11.00iH6/n5 ➢LRNI3Press Fit (Interference)-6.00iH7/p6 ➢LRYI3Press Fit (Interference)-8.00iH6/p5 ➢LRNI3Press Fit (Interference)-8.00iH7/r6 ➢LRYI3Press Fit (Interference)-10.00iH7/s6 ➢RDYI3Press Fit (Interference)-11.00iH8/s7 ➢RDNI3Press Fit (Interference)-11.00iH7/t6 ➢RDNI3Press Fit (Interference)-12.00iH7/u6 ➢DRNI3Press Fit (Interference)-13.00iH8/u7 ➢DRNI3Press Fit (Interference)-13.00iH7/x6 ➢DRNI3Press Fit (Interference)-16.00Shaft Basis Fits (ISO 286-1)fit_typeFitFit LevelPreferedc_idfit_sortFit typeLeveliH10/b9 ➢DGNC1Clearance Fit6.00iH11/b11 ➢DGYC1Clearance Fit6.00iH10/c9 ➢DGNC1Clearance Fit5.00iH11/c11 ➢DGYC1Clearance Fit5.00iH8/d8 ➢GRNC1Clearance Fit4.00iH9/d8 ➢GRNC1Clearance Fit4.00iH10/d9 ➢GRYC1Clearance Fit4.00iH11/d10 ➢GRNC1Clearance Fit4.00iH10/e9 ➢GRNC1Clearance Fit3.00iH9/e8 ➢GRYC1Clearance Fit3.00iH8/e8 ➢GRYC1Clearance Fit3.00iH8/e7 ➢GRNC1Clearance Fit3.00iH7/f6 ➢LGNC1Clearance Fit2.00iH9/f8 ➢LGNC1Clearance Fit2.00iH8/f8 ➢LGNC1Clearance Fit2.00iH8/f7 ➢LGYC1Clearance Fit2.00iH7/g6 ➢LGYC1Clearance Fit1.00iH6/g5 ➢LGNC1Clearance Fit1.00iH10/h9 ➢LGYC1Clearance Fit0.00iH11/h10 ➢LGNC1Clearance Fit0.00iH9/h8 ➢LGNC1Clearance Fit0.00iH8/h8 ➢LGNC1Clearance Fit0.00iH6/h5 ➢LGNC1Clearance Fit0.00iH7/h6 ➢LGYC1Clearance Fit0.00iH8/h7 ➢LGYC1Clearance Fit-1.00iH6/js5 ➢orNT2Transition Fit-1.00iH7/js6 ➢orYT2Transition Fit-1.00iH8/k7 ➢orNT2Transition Fit-3.00iH6/k5 ➢orNT2Transition Fit-3.00iH7/k6 ➢orYT2Transition Fit-3.00iH7/m6 ➢orNT2Transition Fit-5.00iH6/m5 ➢orNT2Transition Fit-5.00iH8/m7 ➢orNT2Transition Fit-5.00iH7/n6 ➢orYT2Transition Fit-6.00iH8/js7 ➢orNT2Transition Fit-11.00iH6/n5 ➢LRNI3Press Fit (Interference)-6.00iH7/p6 ➢LRYI3Press Fit (Interference)-8.00iH6/p5 ➢LRNI3Press Fit (Interference)-8.00iH7/r6 ➢LRYI3Press Fit (Interference)-10.00iH7/s6 ➢RDYI3Press Fit (Interference)-11.00iH8/s7 ➢RDNI3Press Fit (Interference)-11.00iH7/t6 ➢RDNI3Press Fit (Interference)-12.00iH7/u6 ➢DRNI3Press Fit (Interference)-13.00iH8/u7 ➢DRNI3Press Fit (Interference)-13.00iH7/x6 ➢DRNI3Press Fit (Interference)-16.00Fit Combinations Per ANSI B4.1The tolerance classes mentioned in ANSI B4.1 (e.g., h9, g6, etc.) have the same nomenclature as in ISO 286. It could lead a confusion since the ANSI standard also defines the fundamental deviations and the tolerance grade on its own. The ANSI tolerancing system is nearly the same as the ISO 286 but not identical. If you take the values from the standard ISO charts or use our Online Calculator, you should expect about 0.1-0.5 thous errors. wdt_IDFit NameTolerance Class CombinationFit Typeth1RC 1H5/g4Running or Slidining Fits52RC 2H6/g5Running or Slidining Fits63RC 3H7/f6Running or Slidining Fits74RC 4H8/f7Running or Slidining Fits85RC 5H8/e7Running or Slidining Fits86RC 6H9/e8Running or Slidining Fits97RC 7H9/d8Running or Slidining Fits98RC 8H10/c9Running or Slidining Fits109RC 9H11/sh1Running or Slidining Fits1110LC 1H6/h5Clearance Location Fits611LC 2H7/h6Clearance Location Fits712LC 3H8/h7Clearance Location Fits813LC 4H10/h9Clearance Location Fits1014LC 5H7/g6Clearance Location Fits715LC 6H9/f8Clearance Location Fits916LC 7H10/e9Clearance Location Fits1017LC 8H10/d9Clearance Location Fits1018LC 9H11/c10Clearance Location Fits1119LC 10H12/sh2Clearance Location Fits1220LC 11H13/sh3Clearance Location Fits1321LT 1H7/js6Transition Fits722LT 2H8/js7Transition Fits823LT 3H7/k6Transition Fits724LT 4H8/k7Transition Fits825LT 5H7/n6Transition Fits726LT 6H7/n7Transition Fits727LN 1H6/n5Interference Location Fits628LN 2H7/p6Interference Location Fits729LN 3H7/r6Interference Location Fits730FN 1H6/sh4Force or Shrink Fits631FN 2H7/s6Force or Shrink Fits732FN 3H7/t6Force or Shrink Fits733FN 4H7/u6Force or Shrink Fits734FN 5H8/x7Force or Shrink Fits8Fit Combinations Per ANSI B4.2The tolerance classes mentioned in ANSI B4.1 (e.g., h9, g6, etc.) have the same nomenclature as in ISO 286. It could lead a confusion since the ANSI standard also defines the fundamental deviations and the tolerance grade on its own. The ANSI tolerancing system is nearly the same as the ISO 286 but not identical. If you take the values from the standard ISO charts or use our Online Calculator, you should expect about 0.1-0.5 thous errors.ClassificationHole BasisShaft BasisDescriptionClearanceH11/c11C11/h11Loose running fit for wide commercial tolerances or allowances on external members.H9/d9D9/h9Free running fit not for use where accuracy is essential, but good for large temperature variations, high running speeds, or heavy journal pressures.H8/f7F8/h7Close running fit for running on accurate machines and for accurate location at moderate speeds and journal pressures.H7/g6G7/h6Sliding fit not intended to run freely, but to move and turn freely and locate accurately.H7/h6H7/h6Locational clearance fit provides snug fit for locating stationary parts; but can be freely assembled and disassembled.InterferenceH7/k6K7/h6Locational transition fit for accurate location, a compromise between clearance and interference.H7/n6N7/h6Locational transition fit for more accurate location where greater interference is permissible.TransitionH7/p6P7/h6Locational interference fit for parts requiring rigidity and alignment with prime accuracy of location but without special bore pressure requirements.H7/s6S7/h6Medium drive fit for ordinary steel parts or shrink fits on light sections, the tightest fit usable with cast iron.H7/u6U7/h6Force fit suitable for parts which can be highly stressed or for shrink fits where the heavy pressing forces required are impractical.Related Glossary Terms:Thou

Most often found as a residual agent in steels, copper is also added to produce precipitation hardening properties and increase corrosion resistance.

Bullard Abrasives | Custom Cutting Grinding and Finishing Abrasives. About ... Adjustable Spanner Wrench. $8.36. ADJUSTABLE SPANNER WRENCH. Marvel's adjustable ...

Carbon is the most important element in steel, it is essential in steels which have to be hardened by quenching and the degree of carbon controls the hardness and strength of the material, as well as response to heat treatment (hardenability). And ductility, forgeability and machinability will decrease if the amount of carbon increases, as well as weldability properties of the steel.

Calculator OptionsTolerances for holes.Tolerances for shafts.Fit for hole/shaft combinations.Metric/Inch results.Standard/Custom tolerances.

Why Advertise with us?Do you want to reach the technical audience in the machining sector? Look no further! We have a huge audience of professionals, and our unmatched granular targeting ensures your message is delivered in exactly the right place. More information

PREMIUM MEMBERSHIP- Ads Free Browsing- Advanced Calculator Options- Quick Access Favorites BarFor Just 2$ / MonthLearn More

Aluminum is one of the most important deoxidizers in very small amounts in the material, and also helps form a more fine-grained crystalline microstructure and increase the steel grade’s toughness. It is usually used in combination with silicon to obtain a semi- or fully killed steel.

Our high-performance inserts give you precise and low-vibration cutting, allowing you to achieve true and consistent results every time.

Hole refers to an internal feature of a workpiece, typically a bore. However, the term can be used to describe any internal feature. For example, a keyway.

Silicon is one of the principal deoxidizers for steel. Silicon helps to remove bubbles of oxygen from the molten steel. It is the element that is most commonly used to produce semi- and fully killed steels, and normally appears in amounts less than 0.40 percent, usually only small amounts (0.20%) are present in rolled steel when it is used as a deoxidizer. However, in steel castings, 0.35 to 1.00% is commonly present.

For galvanizing purposes, steels containing more than 0.04% silicon can greatly affect the thickness and appearance of the galvanized coating. This will result in thick coatings consisting mainly zinc-iron alloys and the surface has a dark and dull finish. But it provides as much corrosion protection as a shiny galvanized coating where the outer layer is pure zinc.

The tolerance classes mentioned in ANSI B4.1 (e.g., h9, g6, etc.) have the same nomenclature as in ISO 286. It could lead a confusion since the ANSI standard also defines the fundamental deviations and the tolerance grade on its own. The ANSI tolerancing system is nearly the same as the ISO 286 but not identical. If you take the values from the standard ISO charts or use our Online Calculator, you should expect about 0.1-0.5 thous errors.ClassificationHole BasisShaft BasisDescriptionClearanceH11/c11C11/h11Loose running fit for wide commercial tolerances or allowances on external members.H9/d9D9/h9Free running fit not for use where accuracy is essential, but good for large temperature variations, high running speeds, or heavy journal pressures.H8/f7F8/h7Close running fit for running on accurate machines and for accurate location at moderate speeds and journal pressures.H7/g6G7/h6Sliding fit not intended to run freely, but to move and turn freely and locate accurately.H7/h6H7/h6Locational clearance fit provides snug fit for locating stationary parts; but can be freely assembled and disassembled.InterferenceH7/k6K7/h6Locational transition fit for accurate location, a compromise between clearance and interference.H7/n6N7/h6Locational transition fit for more accurate location where greater interference is permissible.TransitionH7/p6P7/h6Locational interference fit for parts requiring rigidity and alignment with prime accuracy of location but without special bore pressure requirements.H7/s6S7/h6Medium drive fit for ordinary steel parts or shrink fits on light sections, the tightest fit usable with cast iron.H7/u6U7/h6Force fit suitable for parts which can be highly stressed or for shrink fits where the heavy pressing forces required are impractical.Related Glossary Terms:Thou

Niobium is a key grain refining element, as well a strength-enhancing elements in steel production. Niobium is a strong carbide former and forms very hard, very small, simple carbides. Improves ductility, hardness, wear and corrosion resistance. Also, refines grain structure. Formerly known as Columbium.

The tolerance size combines the basic size with the tolerance class, designated by the basic size, followedby the designation of the required tolerance class (without spaces). For example, 32H7 specifies a hole with a nominal size of 32 mm, deviation H, and tolerance grade of IT7.Tolerances ChartsStandard Tolerance Grades (IT) ChartTolerance Dimensions in MicronsTo convert to millimeters, divide by 1000To convert to Thous, divide by 25.4 wdt_IDDiameter Range (mm)(Inches)IT01IT0IT1IT2IT3IT4IT5IT6IT7IT8IT9IT10IT11IT12IT13IT14IT15IT16IT17IT1810 - 30 - 0.120.30.50.81.2234610142540601001402504006001000140023 - 60.12 - 0.240.40.611.52.545812183048751201803004807501200180036 - 100.24 - 0.40.40.611.52.5469152236589015022036058090015002200410 - 180.4 - 0.710.50.81.223581118274370110180270430700110018002700518 - 300.71 - 1.190.611.52.54691321335284130210330520840130021003300630 - 501.19 - 1.970.611.52.54711162539621001602503906201000160025003900750 - 801.97 - 3.150.81.2235813193046741201903004607401200190030004600880 - 1203.15 - 4.7311.52.54610152235548714022035054087014002200350054009120 - 1804.73 - 7.091.223.55812182540631001602504006301000160025004000630010180 - 2507.09 - 9.85234.571014202946721151852904607201150185029004600720011250 - 3159.85 - 12.412.54681216233252811302103205208101300210032005200810012315 - 40012.41 - 15.7535791318253657891402303605708901400230036005700890013400 - 50015.75 - 19.7468101520274063971552504006309701550250040006300970014500 - 63019.7 - 24.84.569111622324470110175280440700110017502800440070001100015630 - 80024.8 - 31.55710131825365080125200320500800125020003200500080001250016800 - 100031.5 - 39.45.58111521284056901402303605609001400230036005600900014000171000 - 125039.4 - 49.26.59131824334766105165260420660105016502600420066001050016500181250 - 160049.2 - 63811152129395578125195310500780125019503100500078001250019500191600 - 200063 - 78.7913182535466592150230370600920150023003700600092001500023000202000 - 250078.7 - 98.4111522304155781101752804407001100175028004400700011001750028000212500 - 315098.4 - 1241318263650689613521033054086013502100330054008600135002100033000Fundamental deviation of holes ChartClick the Tolerance Link (e.g., H ➢) to get the Full & Accurate charts for a specific deviation in Inch and Metric unitsClick  icons to show all columns for the entire diameter range (0-3,150 mm)The deviations of J through Z also depend on the IT Therefore, the values in the below table are only accurate in some cases. To get the correct value in all cases, click the Tolerance Link (e.g., H ➢).Dimentions in Microns. To convert to millimeters, divide by 1000, to Thous, divide by 25.4 Deviationidurl0 - 3 mm3 - 6 mm6 - 1010 - 1414 - 1818 - 2424 - 3030 - 4040 - 5050 - 6565 - 8080 - 100100 - 120120 - 140140 - 160160 - 180180 - 200200 - 225225 - 250250 - 280280 - 315315 - 355355 - 400400 - 450450 - 500500 - 560560 - 630630 - 710710 - 800800 - 900900 - 10001000 - 11201120 - 12501250 - 14001400 - 16001600 - 18001800 - 20002000 - 22402240 - 25002500 - 28002800 - 3150A ➢1calculators/tolerances/tol?dev=a||A ➢27027028029029030030031032034036038041046052058066074082092010501200135015001650XXXXXXXXXXXXXXXXB ➢2calculators/tolerances/tol?dev=b||B ➢140140150150150160160170180190200220240260280310340380420480540600680760840XXXXXXXXXXXXXXXXC ➢3calculators/tolerances/tol?dev=c||C ➢6070809595110110120130140150170180200210230240260280300330360400440480520580640700780860940105011501300145016001800200022002500CD ➢4calculators/tolerances/tol?dev=cd||CD ➢344656XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXD ➢5calculators/tolerances/tol?dev=d||D ➢203040505065658080100100120120145145145170170170190190210210230230260260290290320320350350390390430430480480520520E ➢6calculators/tolerances/tol?dev=e||E ➢14202532324040505060607272858585100100100110110125125135135145145160160170170195195220220240240260260290290EF ➢7calculators/tolerances/tol?dev=ef||EF ➢101418XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXF ➢8calculators/tolerances/tol?dev=f||F ➢61013161620202525303036364343435050505656626268687676808086869898110110120120130130145145FG ➢9calculators/tolerances/tol?dev=fg||FG ➢468XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXG ➢10calculators/tolerances/tol?dev=g||G ➢2456677991010121214141415151517171818202022222424262628283030323234343838H ➢11calculators/tolerances/tol?dev=h||H ➢00000000000000000000000000000000000000000JS ➢12calculators/tolerances/tol?dev=js||JS ➢00000000000000000000000000000000000000000J ➢13calculators/tolerances/tol?dev=j||J ➢46810101212141418182222262626303030363639394343XXXXXXXXXXXXXXXXK ➢14calculators/tolerances/tol?dev=k||K ➢0-1-1-1-1-2-2-2-2-2-2-3-3-3-3-3-4-4-4-4-4-4-4-5-50000000000000000M ➢15calculators/tolerances/tol?dev=m||M ➢-2-4-6-7-7-8-8-9-9-11-11-13-13-15-15-15-17-17-17-20-20-21-21-23-23-26-26-30-30-34-34-40-40-48-48-58-58-68-68-76-76N ➢16calculators/tolerances/tol?dev=n||N ➢-4-8-10-12-12-15-15-17-17-20-20-23-23-27-27-27-31-31-31-34-34-37-37-40-40-44-44-50-50-56-56-66-66-78-78-92-92-110-110-135-135P ➢17calculators/tolerances/tol?dev=p||P ➢-6-12-15-18-18-22-22-26-26-32-32-37-37-43-43-43-50-50-50-56-56-62-62-68-68-78-78-88-88-100-100-120-120-140-140-170-170-195-195-240-240R ➢18calculators/tolerances/tol?dev=r||R ➢-10-15-19-23-23-28-28-34-34-41-43-51-54-63-65-68-77-80-84-94-98-108-114-126-132-150-155-175-185-210-220-250-260-300-330-370-400-440-460-550-580S ➢19calculators/tolerances/tol?dev=s||S ➢-14-19-23-28-28-35-35-43-43-53-59-71-79-92-100-108-122-130-140-158-170-190-208-232-252-280-310-340-380-430-470-520-580-640-720-820-920-1000-1100-1250-1400T ➢20calculators/tolerances/tol?dev=t||T ➢000XXX-41-48-54-66-75-91-104-122-134-146-166-180-196-218-240-268-294-330-360-400-450-500-560-620-680-780-840-960-1050-1200-1350-1500-1650-1900-2100U ➢21calculators/tolerances/tol?dev=u||U ➢-18-23-28-33-33-41-48-60-70-87-102-124-144-170-190-210-236-258-284-315-350-390-435-490-540-600-660-740-840-940-1050-1150-1300-1450-1600-1850-2000-2300-2500-2900-3200V ➢22calculators/tolerances/tol?dev=v||V ➢000X-39-47-55-68-81-102-120-146-172-202-228-252-284-310-340-385-425-475-530-595-660-740-820-920-1000-1150-1300-1450-1600-1800-2000-2300-2500-2800-3100-3500-3900X ➢23calculators/tolerances/tol?dev=x||X ➢-20-28-34-40-45-54-64-80-97-122-146-178-210-248-280-310-340-385-425-475-525-590-660-740-820XXXXXXXXXXXXXXXXY ➢24calculators/tolerances/tol?dev=y||Y ➢000XX-63-75-94-114-144-174-214-254-300-340-380-425-470-520-580-650-730-820-920-1000XXXXXXXXXXXXXXXXZ ➢25calculators/tolerances/tol?dev=z||Z ➢-26-35-42-50-60-73-88-112-136-172-210-258-310-365-415-465-520-575-640-710-790-900-1000-1100-1250XXXXXXXXXXXXXXXXZA ➢26calculators/tolerances/tol?dev=za||ZA ➢-32-42-52-64-77-98-118-148-180-226-274-335-400-470-535-600-670-740-820-920-1000-1150-1300-1450-1600XXXXXXXXXXXXXXXXFundamental deviation of shafts ChartClick the Tolerance Link (e.g., g ➢) to get the Full & Accurate charts for a specific deviation in Inch and Metric unitsClick  icons to show all columns of the entire diameter range (0-3,150 mm)The deviations of J through Z also depend on the IT Therefore, the values in the below table are only accurate in some cases. To get the correct value in all cases, click the Tolerance Link (e.g., g ➢).Dimentions in Microns. To convert to millimeters, divide by 1000, to Thous, divide by 25.4 Deviationidurl0 - 3 mm3 - 6 mm6 - 1010 - 1414 - 1818 - 2424 - 3030 - 4040 - 5050 - 6565 - 8080 - 100100 - 120120 - 140140 - 160160 - 180180 - 200200 - 225225 - 250250 - 280280 - 315315 - 355355 - 400400 - 450450 - 500500 - 560560 - 630630 - 710710 - 800800 - 900900 - 10001000 - 11201120 - 12501250 - 14001400 - 16001600 - 18001800 - 20002000 - 22402240 - 25002500 - 28002800 - 3150a ➢1calculators/tolerances/tol?dev=a||A ➢-270-270-280-290-290-300-300-310-320-340-360-380-410-460-520-580-660-740-820-920-1050-1200-1350-1500-1650XXXXXXXXXXXXXXXXb ➢2calculators/tolerances/tol?dev=b||B ➢-140-140-150-150-150-160-160-170-180-190-200-220-240-260-280-310-340-380-420-480-540-600-680-760-840XXXXXXXXXXXXXXXXc ➢3calculators/tolerances/tol?dev=c||C ➢-60-70-80-95-95-110-110-120-130-140-150-170-180-200-210-230-240-260-280-300-330-360-400-440-480-520-580-640-700-780-860-940-1050-1150-1300-1450-1600-1800-2000-2200-2500cd ➢4calculators/tolerances/tol?dev=cd||CD ➢-34-46-56XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXd ➢5calculators/tolerances/tol?dev=d||D ➢-20-30-40-50-50-65-65-80-80-100-100-120-120-145-145-145-170-170-170-190-190-210-210-230-230-260-260-290-290-320-320-350-350-390-390-430-430-480-480-520-520e ➢6calculators/tolerances/tol?dev=e||E ➢-14-20-25-32-32-40-40-50-50-60-60-72-72-85-85-85-100-100-100-110-110-125-125-135-135-145-145-160-160-170-170-195-195-220-220-240-240-260-260-290-290ef ➢7calculators/tolerances/tol?dev=ef||EF ➢-10-14-18XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXf ➢8calculators/tolerances/tol?dev=f||F ➢-6-10-13-16-16-20-20-25-25-30-30-36-36-43-43-43-50-50-50-56-56-62-62-68-68-76-76-80-80-86-86-98-98-110-110-120-120-130-130-145-145fg ➢9calculators/tolerances/tol?dev=fg||FG ➢-4-6-8XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXg ➢10calculators/tolerances/tol?dev=g||G ➢-2-4-5-6-6-7-7-9-9-10-10-12-12-14-14-14-15-15-15-17-17-18-18-20-20-22-22-24-24-26-26-28-28-30-30-32-32-34-34-38-38h ➢11calculators/tolerances/tol?dev=h||H ➢00000000000000000000000000000000000000000js ➢12calculators/tolerances/tol?dev=js||JS ➢00000000000000000000000000000000000000000j ➢13calculators/tolerances/tol?dev=j||J ➢-4-6-8-10-10-12-12-14-14-18-18-22-22-26-26-26-30-30-30-36-36-39-39-43-43XXXXXXXXXXXXXXXXk ➢14calculators/tolerances/tol?dev=k||K ➢01111222222333334444444550000000000000000m ➢15calculators/tolerances/tol?dev=m||M ➢2467788991111131315151517171720202121232326263030343440404848585868687676n ➢16calculators/tolerances/tol?dev=n||N ➢481012121515171720202323272727313131343437374040444450505656666678789292110110135135p ➢17calculators/tolerances/tol?dev=p||P ➢612151818222226263232373743434350505056566262686878788888100100120120140140170170195195240240r ➢18calculators/tolerances/tol?dev=r||R ➢101519232328283434414351546365687780849498108114126132150155175185210220250260300330370400440460550580s ➢19calculators/tolerances/tol?dev=s||S ➢14192328283535434353597179921001081221301401581701902082322522803103403804304705205806407208209201000110012501400t ➢20calculators/tolerances/tol?dev=t||T ➢000XXX4148546675911041221341461661801962182402682943303604004505005606206807808409601050120013501500165019002100u ➢21calculators/tolerances/tol?dev=u||U ➢1823283333414860708710212414417019021023625828431535039043549054060066074084094010501150130014501600185020002300250029003200v ➢22calculators/tolerances/tol?dev=v||V ➢000X39475568811021201461722022282522843103403854254755305956607408209201000115013001450160018002000230025002800310035003900x ➢23calculators/tolerances/tol?dev=x||X ➢202834404554648097122146178210248280310340385425475525590660740820XXXXXXXXXXXXXXXXy ➢24calculators/tolerances/tol?dev=y||Y ➢000XX6375941141441742142543003403804254705205806507308209201000XXXXXXXXXXXXXXXXz ➢25calculators/tolerances/tol?dev=z||Z ➢26354250607388112136172210258310365415465520575640710790900100011001250XXXXXXXXXXXXXXXXza ➢26calculators/tolerances/tol?dev=za||ZA ➢32425264779811814818022627433540047053560067074082092010001150130014501600XXXXXXXXXXXXXXXXEngineering FitsEngineering fit refers to the degree of tightness or looseness between two mating parts in an assembly. It is defined by combining a hole with a tolerance class and a shaft with a tolerance class. (See definition of terms above).Several standards define recommended pairings for different applications. The values presented in our charts and Calculator are based on ISO 286-1:2010 (In earlier revisions, it was separated into ISO 1829, which is now obsolete). In North America, additional fit combinations are sometimes used per ANSI B4.1 & B4.2. The ANSI tolerancing system is nearly equivalent to ISO 286 but not identical. The difference is typically 0.1-0.5 thous.Main Fit TypesClearance FitA clearance fit is a type in which the shaft is smaller than the hole it is inserted into, allowing for free movement, assembly, and disassembly. Clearance fits can range from loose-running for assemblies that need a significant gap for free movement or to accommodate temperature variation to locational clearance for stationary parts that need to be freely assembled/disassembled but still maintain accuracy.Transition FitA transition fit is a type in which the shaft may be slightly smaller or larger than the hole (before assembly). It is used to create a tight and secure connection between them in applications requiring high precision and stability. It provides high accuracy, but the connecting parts can be disassembled and reassembled without damage. However, force cannot be transmitted.Press Fit (Interference)An interference (Press) fit is a type in which the shaft is larger than the hole (before assembly). It creates a frictional force that holds the parts together without the need for additional fasteners or adhesives. The interference fit is commonly used in mechanical engineering to create solid and reliable connections between components that need to withstand heavy loads or vibrations. However, It is hard to disassemble without damaging the parts. Some degree of force can be transmitted between the components.Fits are also divided into two types of “basis”There are no technical differences between the two basis. Therefore the choice of the system should be based on economic reasons.Hole Basis FitsThe hole deviation is zero (meaning an H), and the shaft deviation varies to create different fit levels. For example, H9/d8 , H7/g6. It is the first choice of combinations for general use, since it avoids an unnecessary multiplicity of tools (e.g., reamers) and gaugesShaft Basis FitsThe shaft deviation is zero (meaning an h), and the hole deviation varies to create different fit levels. For example, D9/h9, G7/h6. This method should only be utilized when it offers clear economic benefits, such as in situations where it is required to assemble multiple parts with holes that have varying deviations onto a single shaft.Fits Standard Combinations ChartsFor ordinary engineering purposes, only a small number of the many (~150,000) possible fit combinations is required. ISO 286-1:2010 lists about 80 fit combinations that meet most of the needs of any engineering task. You can choose from this list or define a custom combination in our Fit Calculator.(*) In North America, additional fit combinations are sometimes used per ANSI B4.1 & B4.2. You can find below the ISO charts also the ANSI Charts.Click the Fit Link (e.g. G7/h6 ➢) to get its detailed tolerances in both Inch and millimetersHole Basis Fits (ISO 286-1)fit_typeFitFit LevelPreferedc_idfit_sortFit typeLeveliH10/b9 ➢DGNC1Clearance Fit6.00iH11/b11 ➢DGYC1Clearance Fit6.00iH10/c9 ➢DGNC1Clearance Fit5.00iH11/c11 ➢DGYC1Clearance Fit5.00iH8/d8 ➢GRNC1Clearance Fit4.00iH9/d8 ➢GRNC1Clearance Fit4.00iH10/d9 ➢GRYC1Clearance Fit4.00iH11/d10 ➢GRNC1Clearance Fit4.00iH10/e9 ➢GRNC1Clearance Fit3.00iH9/e8 ➢GRYC1Clearance Fit3.00iH8/e8 ➢GRYC1Clearance Fit3.00iH8/e7 ➢GRNC1Clearance Fit3.00iH7/f6 ➢LGNC1Clearance Fit2.00iH9/f8 ➢LGNC1Clearance Fit2.00iH8/f8 ➢LGNC1Clearance Fit2.00iH8/f7 ➢LGYC1Clearance Fit2.00iH7/g6 ➢LGYC1Clearance Fit1.00iH6/g5 ➢LGNC1Clearance Fit1.00iH10/h9 ➢LGYC1Clearance Fit0.00iH11/h10 ➢LGNC1Clearance Fit0.00iH9/h8 ➢LGNC1Clearance Fit0.00iH8/h8 ➢LGNC1Clearance Fit0.00iH6/h5 ➢LGNC1Clearance Fit0.00iH7/h6 ➢LGYC1Clearance Fit0.00iH8/h7 ➢LGYC1Clearance Fit-1.00iH6/js5 ➢orNT2Transition Fit-1.00iH7/js6 ➢orYT2Transition Fit-1.00iH8/k7 ➢orNT2Transition Fit-3.00iH6/k5 ➢orNT2Transition Fit-3.00iH7/k6 ➢orYT2Transition Fit-3.00iH7/m6 ➢orNT2Transition Fit-5.00iH6/m5 ➢orNT2Transition Fit-5.00iH8/m7 ➢orNT2Transition Fit-5.00iH7/n6 ➢orYT2Transition Fit-6.00iH8/js7 ➢orNT2Transition Fit-11.00iH6/n5 ➢LRNI3Press Fit (Interference)-6.00iH7/p6 ➢LRYI3Press Fit (Interference)-8.00iH6/p5 ➢LRNI3Press Fit (Interference)-8.00iH7/r6 ➢LRYI3Press Fit (Interference)-10.00iH7/s6 ➢RDYI3Press Fit (Interference)-11.00iH8/s7 ➢RDNI3Press Fit (Interference)-11.00iH7/t6 ➢RDNI3Press Fit (Interference)-12.00iH7/u6 ➢DRNI3Press Fit (Interference)-13.00iH8/u7 ➢DRNI3Press Fit (Interference)-13.00iH7/x6 ➢DRNI3Press Fit (Interference)-16.00Shaft Basis Fits (ISO 286-1)fit_typeFitFit LevelPreferedc_idfit_sortFit typeLeveliH10/b9 ➢DGNC1Clearance Fit6.00iH11/b11 ➢DGYC1Clearance Fit6.00iH10/c9 ➢DGNC1Clearance Fit5.00iH11/c11 ➢DGYC1Clearance Fit5.00iH8/d8 ➢GRNC1Clearance Fit4.00iH9/d8 ➢GRNC1Clearance Fit4.00iH10/d9 ➢GRYC1Clearance Fit4.00iH11/d10 ➢GRNC1Clearance Fit4.00iH10/e9 ➢GRNC1Clearance Fit3.00iH9/e8 ➢GRYC1Clearance Fit3.00iH8/e8 ➢GRYC1Clearance Fit3.00iH8/e7 ➢GRNC1Clearance Fit3.00iH7/f6 ➢LGNC1Clearance Fit2.00iH9/f8 ➢LGNC1Clearance Fit2.00iH8/f8 ➢LGNC1Clearance Fit2.00iH8/f7 ➢LGYC1Clearance Fit2.00iH7/g6 ➢LGYC1Clearance Fit1.00iH6/g5 ➢LGNC1Clearance Fit1.00iH10/h9 ➢LGYC1Clearance Fit0.00iH11/h10 ➢LGNC1Clearance Fit0.00iH9/h8 ➢LGNC1Clearance Fit0.00iH8/h8 ➢LGNC1Clearance Fit0.00iH6/h5 ➢LGNC1Clearance Fit0.00iH7/h6 ➢LGYC1Clearance Fit0.00iH8/h7 ➢LGYC1Clearance Fit-1.00iH6/js5 ➢orNT2Transition Fit-1.00iH7/js6 ➢orYT2Transition Fit-1.00iH8/k7 ➢orNT2Transition Fit-3.00iH6/k5 ➢orNT2Transition Fit-3.00iH7/k6 ➢orYT2Transition Fit-3.00iH7/m6 ➢orNT2Transition Fit-5.00iH6/m5 ➢orNT2Transition Fit-5.00iH8/m7 ➢orNT2Transition Fit-5.00iH7/n6 ➢orYT2Transition Fit-6.00iH8/js7 ➢orNT2Transition Fit-11.00iH6/n5 ➢LRNI3Press Fit (Interference)-6.00iH7/p6 ➢LRYI3Press Fit (Interference)-8.00iH6/p5 ➢LRNI3Press Fit (Interference)-8.00iH7/r6 ➢LRYI3Press Fit (Interference)-10.00iH7/s6 ➢RDYI3Press Fit (Interference)-11.00iH8/s7 ➢RDNI3Press Fit (Interference)-11.00iH7/t6 ➢RDNI3Press Fit (Interference)-12.00iH7/u6 ➢DRNI3Press Fit (Interference)-13.00iH8/u7 ➢DRNI3Press Fit (Interference)-13.00iH7/x6 ➢DRNI3Press Fit (Interference)-16.00Fit Combinations Per ANSI B4.1The tolerance classes mentioned in ANSI B4.1 (e.g., h9, g6, etc.) have the same nomenclature as in ISO 286. It could lead a confusion since the ANSI standard also defines the fundamental deviations and the tolerance grade on its own. The ANSI tolerancing system is nearly the same as the ISO 286 but not identical. If you take the values from the standard ISO charts or use our Online Calculator, you should expect about 0.1-0.5 thous errors. wdt_IDFit NameTolerance Class CombinationFit Typeth1RC 1H5/g4Running or Slidining Fits52RC 2H6/g5Running or Slidining Fits63RC 3H7/f6Running or Slidining Fits74RC 4H8/f7Running or Slidining Fits85RC 5H8/e7Running or Slidining Fits86RC 6H9/e8Running or Slidining Fits97RC 7H9/d8Running or Slidining Fits98RC 8H10/c9Running or Slidining Fits109RC 9H11/sh1Running or Slidining Fits1110LC 1H6/h5Clearance Location Fits611LC 2H7/h6Clearance Location Fits712LC 3H8/h7Clearance Location Fits813LC 4H10/h9Clearance Location Fits1014LC 5H7/g6Clearance Location Fits715LC 6H9/f8Clearance Location Fits916LC 7H10/e9Clearance Location Fits1017LC 8H10/d9Clearance Location Fits1018LC 9H11/c10Clearance Location Fits1119LC 10H12/sh2Clearance Location Fits1220LC 11H13/sh3Clearance Location Fits1321LT 1H7/js6Transition Fits722LT 2H8/js7Transition Fits823LT 3H7/k6Transition Fits724LT 4H8/k7Transition Fits825LT 5H7/n6Transition Fits726LT 6H7/n7Transition Fits727LN 1H6/n5Interference Location Fits628LN 2H7/p6Interference Location Fits729LN 3H7/r6Interference Location Fits730FN 1H6/sh4Force or Shrink Fits631FN 2H7/s6Force or Shrink Fits732FN 3H7/t6Force or Shrink Fits733FN 4H7/u6Force or Shrink Fits734FN 5H8/x7Force or Shrink Fits8Fit Combinations Per ANSI B4.2The tolerance classes mentioned in ANSI B4.1 (e.g., h9, g6, etc.) have the same nomenclature as in ISO 286. It could lead a confusion since the ANSI standard also defines the fundamental deviations and the tolerance grade on its own. The ANSI tolerancing system is nearly the same as the ISO 286 but not identical. If you take the values from the standard ISO charts or use our Online Calculator, you should expect about 0.1-0.5 thous errors.ClassificationHole BasisShaft BasisDescriptionClearanceH11/c11C11/h11Loose running fit for wide commercial tolerances or allowances on external members.H9/d9D9/h9Free running fit not for use where accuracy is essential, but good for large temperature variations, high running speeds, or heavy journal pressures.H8/f7F8/h7Close running fit for running on accurate machines and for accurate location at moderate speeds and journal pressures.H7/g6G7/h6Sliding fit not intended to run freely, but to move and turn freely and locate accurately.H7/h6H7/h6Locational clearance fit provides snug fit for locating stationary parts; but can be freely assembled and disassembled.InterferenceH7/k6K7/h6Locational transition fit for accurate location, a compromise between clearance and interference.H7/n6N7/h6Locational transition fit for more accurate location where greater interference is permissible.TransitionH7/p6P7/h6Locational interference fit for parts requiring rigidity and alignment with prime accuracy of location but without special bore pressure requirements.H7/s6S7/h6Medium drive fit for ordinary steel parts or shrink fits on light sections, the tightest fit usable with cast iron.H7/u6U7/h6Force fit suitable for parts which can be highly stressed or for shrink fits where the heavy pressing forces required are impractical.Related Glossary Terms:Thou

The algebraic difference between the upper limit and the basic size is called the upper deviation and is denoted by es for shafts and ES for holes. The algebraic difference between the lower limit and the basic size is called the lower deviation and is represented by ei for shafts and EI for holes. The configurations may be confusing and depend if the feature is external or internal and if the deviation is negative, positive, or zero.Deviation SymbolA-GHes=0,ei=ITEI=0, ES=ITJSei=es=IT/2EI=ES=IT/2K-ZToleranceTolerance is the difference between the limits of size. That is the upper limit minus the lower limit.Standard Tolerance Grade: A number between 0 to 18 and designated as “IT” (e.g. IT7). A lower IT means higher accuracy. The value of each IT also depends on the basic size. You can find the values in the below chart.The IS0 system provides 20 standard tolerance grades, of which IT1 to IT18 are considered general use. In addition, there are two complementary grades, IT01 and IT0. The collection of charts provided in ISO 286-2 covers only IT1-IT18.Tolerance Class: The term used for the combination of a fundamental deviation with a standard tolerance grade, e.g. h9, D13, etc.All the above terms are summarized in the below infographics(*) Click to enlargeNomenclatureStandard Tolerance GradesThe standard tolerance grades are designated by the letters IT followed by a number, for example, IT7. When the tolerance grade is associated with a fundamental deviation symbol to form a tolerance class, the letters IT are omitted (e.g., h7, JS5)Fundamental DeviationA 1-2 letter code represents the fundamental deviation. Upper case (e.g., G, JS) designates hole deviations, while lower case (e.g., g, js) designates shaft deviations.Tolerance ClassThe tolerance class is designated by the letter(s) representing the fundamental deviation followed by the standard tolerance grade number. For example, a shaft with a deviation of g and a tolerance grade of T11 will be denoted as g11. A hole with a deviation of JS and a tolerance grade of IT7 will be represented as JS7.Tolerance SizeThe tolerance size combines the basic size with the tolerance class, designated by the basic size, followedby the designation of the required tolerance class (without spaces). For example, 32H7 specifies a hole with a nominal size of 32 mm, deviation H, and tolerance grade of IT7.Tolerances ChartsStandard Tolerance Grades (IT) ChartTolerance Dimensions in MicronsTo convert to millimeters, divide by 1000To convert to Thous, divide by 25.4 wdt_IDDiameter Range (mm)(Inches)IT01IT0IT1IT2IT3IT4IT5IT6IT7IT8IT9IT10IT11IT12IT13IT14IT15IT16IT17IT1810 - 30 - 0.120.30.50.81.2234610142540601001402504006001000140023 - 60.12 - 0.240.40.611.52.545812183048751201803004807501200180036 - 100.24 - 0.40.40.611.52.5469152236589015022036058090015002200410 - 180.4 - 0.710.50.81.223581118274370110180270430700110018002700518 - 300.71 - 1.190.611.52.54691321335284130210330520840130021003300630 - 501.19 - 1.970.611.52.54711162539621001602503906201000160025003900750 - 801.97 - 3.150.81.2235813193046741201903004607401200190030004600880 - 1203.15 - 4.7311.52.54610152235548714022035054087014002200350054009120 - 1804.73 - 7.091.223.55812182540631001602504006301000160025004000630010180 - 2507.09 - 9.85234.571014202946721151852904607201150185029004600720011250 - 3159.85 - 12.412.54681216233252811302103205208101300210032005200810012315 - 40012.41 - 15.7535791318253657891402303605708901400230036005700890013400 - 50015.75 - 19.7468101520274063971552504006309701550250040006300970014500 - 63019.7 - 24.84.569111622324470110175280440700110017502800440070001100015630 - 80024.8 - 31.55710131825365080125200320500800125020003200500080001250016800 - 100031.5 - 39.45.58111521284056901402303605609001400230036005600900014000171000 - 125039.4 - 49.26.59131824334766105165260420660105016502600420066001050016500181250 - 160049.2 - 63811152129395578125195310500780125019503100500078001250019500191600 - 200063 - 78.7913182535466592150230370600920150023003700600092001500023000202000 - 250078.7 - 98.4111522304155781101752804407001100175028004400700011001750028000212500 - 315098.4 - 1241318263650689613521033054086013502100330054008600135002100033000Fundamental deviation of holes ChartClick the Tolerance Link (e.g., H ➢) to get the Full & Accurate charts for a specific deviation in Inch and Metric unitsClick  icons to show all columns for the entire diameter range (0-3,150 mm)The deviations of J through Z also depend on the IT Therefore, the values in the below table are only accurate in some cases. To get the correct value in all cases, click the Tolerance Link (e.g., H ➢).Dimentions in Microns. To convert to millimeters, divide by 1000, to Thous, divide by 25.4 Deviationidurl0 - 3 mm3 - 6 mm6 - 1010 - 1414 - 1818 - 2424 - 3030 - 4040 - 5050 - 6565 - 8080 - 100100 - 120120 - 140140 - 160160 - 180180 - 200200 - 225225 - 250250 - 280280 - 315315 - 355355 - 400400 - 450450 - 500500 - 560560 - 630630 - 710710 - 800800 - 900900 - 10001000 - 11201120 - 12501250 - 14001400 - 16001600 - 18001800 - 20002000 - 22402240 - 25002500 - 28002800 - 3150A ➢1calculators/tolerances/tol?dev=a||A ➢27027028029029030030031032034036038041046052058066074082092010501200135015001650XXXXXXXXXXXXXXXXB ➢2calculators/tolerances/tol?dev=b||B ➢140140150150150160160170180190200220240260280310340380420480540600680760840XXXXXXXXXXXXXXXXC ➢3calculators/tolerances/tol?dev=c||C ➢6070809595110110120130140150170180200210230240260280300330360400440480520580640700780860940105011501300145016001800200022002500CD ➢4calculators/tolerances/tol?dev=cd||CD ➢344656XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXD ➢5calculators/tolerances/tol?dev=d||D ➢203040505065658080100100120120145145145170170170190190210210230230260260290290320320350350390390430430480480520520E ➢6calculators/tolerances/tol?dev=e||E ➢14202532324040505060607272858585100100100110110125125135135145145160160170170195195220220240240260260290290EF ➢7calculators/tolerances/tol?dev=ef||EF ➢101418XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXF ➢8calculators/tolerances/tol?dev=f||F ➢61013161620202525303036364343435050505656626268687676808086869898110110120120130130145145FG ➢9calculators/tolerances/tol?dev=fg||FG ➢468XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXG ➢10calculators/tolerances/tol?dev=g||G ➢2456677991010121214141415151517171818202022222424262628283030323234343838H ➢11calculators/tolerances/tol?dev=h||H ➢00000000000000000000000000000000000000000JS ➢12calculators/tolerances/tol?dev=js||JS ➢00000000000000000000000000000000000000000J ➢13calculators/tolerances/tol?dev=j||J ➢46810101212141418182222262626303030363639394343XXXXXXXXXXXXXXXXK ➢14calculators/tolerances/tol?dev=k||K ➢0-1-1-1-1-2-2-2-2-2-2-3-3-3-3-3-4-4-4-4-4-4-4-5-50000000000000000M ➢15calculators/tolerances/tol?dev=m||M ➢-2-4-6-7-7-8-8-9-9-11-11-13-13-15-15-15-17-17-17-20-20-21-21-23-23-26-26-30-30-34-34-40-40-48-48-58-58-68-68-76-76N ➢16calculators/tolerances/tol?dev=n||N ➢-4-8-10-12-12-15-15-17-17-20-20-23-23-27-27-27-31-31-31-34-34-37-37-40-40-44-44-50-50-56-56-66-66-78-78-92-92-110-110-135-135P ➢17calculators/tolerances/tol?dev=p||P ➢-6-12-15-18-18-22-22-26-26-32-32-37-37-43-43-43-50-50-50-56-56-62-62-68-68-78-78-88-88-100-100-120-120-140-140-170-170-195-195-240-240R ➢18calculators/tolerances/tol?dev=r||R ➢-10-15-19-23-23-28-28-34-34-41-43-51-54-63-65-68-77-80-84-94-98-108-114-126-132-150-155-175-185-210-220-250-260-300-330-370-400-440-460-550-580S ➢19calculators/tolerances/tol?dev=s||S ➢-14-19-23-28-28-35-35-43-43-53-59-71-79-92-100-108-122-130-140-158-170-190-208-232-252-280-310-340-380-430-470-520-580-640-720-820-920-1000-1100-1250-1400T ➢20calculators/tolerances/tol?dev=t||T ➢000XXX-41-48-54-66-75-91-104-122-134-146-166-180-196-218-240-268-294-330-360-400-450-500-560-620-680-780-840-960-1050-1200-1350-1500-1650-1900-2100U ➢21calculators/tolerances/tol?dev=u||U ➢-18-23-28-33-33-41-48-60-70-87-102-124-144-170-190-210-236-258-284-315-350-390-435-490-540-600-660-740-840-940-1050-1150-1300-1450-1600-1850-2000-2300-2500-2900-3200V ➢22calculators/tolerances/tol?dev=v||V ➢000X-39-47-55-68-81-102-120-146-172-202-228-252-284-310-340-385-425-475-530-595-660-740-820-920-1000-1150-1300-1450-1600-1800-2000-2300-2500-2800-3100-3500-3900X ➢23calculators/tolerances/tol?dev=x||X ➢-20-28-34-40-45-54-64-80-97-122-146-178-210-248-280-310-340-385-425-475-525-590-660-740-820XXXXXXXXXXXXXXXXY ➢24calculators/tolerances/tol?dev=y||Y ➢000XX-63-75-94-114-144-174-214-254-300-340-380-425-470-520-580-650-730-820-920-1000XXXXXXXXXXXXXXXXZ ➢25calculators/tolerances/tol?dev=z||Z ➢-26-35-42-50-60-73-88-112-136-172-210-258-310-365-415-465-520-575-640-710-790-900-1000-1100-1250XXXXXXXXXXXXXXXXZA ➢26calculators/tolerances/tol?dev=za||ZA ➢-32-42-52-64-77-98-118-148-180-226-274-335-400-470-535-600-670-740-820-920-1000-1150-1300-1450-1600XXXXXXXXXXXXXXXXFundamental deviation of shafts ChartClick the Tolerance Link (e.g., g ➢) to get the Full & Accurate charts for a specific deviation in Inch and Metric unitsClick  icons to show all columns of the entire diameter range (0-3,150 mm)The deviations of J through Z also depend on the IT Therefore, the values in the below table are only accurate in some cases. To get the correct value in all cases, click the Tolerance Link (e.g., g ➢).Dimentions in Microns. To convert to millimeters, divide by 1000, to Thous, divide by 25.4 Deviationidurl0 - 3 mm3 - 6 mm6 - 1010 - 1414 - 1818 - 2424 - 3030 - 4040 - 5050 - 6565 - 8080 - 100100 - 120120 - 140140 - 160160 - 180180 - 200200 - 225225 - 250250 - 280280 - 315315 - 355355 - 400400 - 450450 - 500500 - 560560 - 630630 - 710710 - 800800 - 900900 - 10001000 - 11201120 - 12501250 - 14001400 - 16001600 - 18001800 - 20002000 - 22402240 - 25002500 - 28002800 - 3150a ➢1calculators/tolerances/tol?dev=a||A ➢-270-270-280-290-290-300-300-310-320-340-360-380-410-460-520-580-660-740-820-920-1050-1200-1350-1500-1650XXXXXXXXXXXXXXXXb ➢2calculators/tolerances/tol?dev=b||B ➢-140-140-150-150-150-160-160-170-180-190-200-220-240-260-280-310-340-380-420-480-540-600-680-760-840XXXXXXXXXXXXXXXXc ➢3calculators/tolerances/tol?dev=c||C ➢-60-70-80-95-95-110-110-120-130-140-150-170-180-200-210-230-240-260-280-300-330-360-400-440-480-520-580-640-700-780-860-940-1050-1150-1300-1450-1600-1800-2000-2200-2500cd ➢4calculators/tolerances/tol?dev=cd||CD ➢-34-46-56XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXd ➢5calculators/tolerances/tol?dev=d||D ➢-20-30-40-50-50-65-65-80-80-100-100-120-120-145-145-145-170-170-170-190-190-210-210-230-230-260-260-290-290-320-320-350-350-390-390-430-430-480-480-520-520e ➢6calculators/tolerances/tol?dev=e||E ➢-14-20-25-32-32-40-40-50-50-60-60-72-72-85-85-85-100-100-100-110-110-125-125-135-135-145-145-160-160-170-170-195-195-220-220-240-240-260-260-290-290ef ➢7calculators/tolerances/tol?dev=ef||EF ➢-10-14-18XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXf ➢8calculators/tolerances/tol?dev=f||F ➢-6-10-13-16-16-20-20-25-25-30-30-36-36-43-43-43-50-50-50-56-56-62-62-68-68-76-76-80-80-86-86-98-98-110-110-120-120-130-130-145-145fg ➢9calculators/tolerances/tol?dev=fg||FG ➢-4-6-8XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXg ➢10calculators/tolerances/tol?dev=g||G ➢-2-4-5-6-6-7-7-9-9-10-10-12-12-14-14-14-15-15-15-17-17-18-18-20-20-22-22-24-24-26-26-28-28-30-30-32-32-34-34-38-38h ➢11calculators/tolerances/tol?dev=h||H ➢00000000000000000000000000000000000000000js ➢12calculators/tolerances/tol?dev=js||JS ➢00000000000000000000000000000000000000000j ➢13calculators/tolerances/tol?dev=j||J ➢-4-6-8-10-10-12-12-14-14-18-18-22-22-26-26-26-30-30-30-36-36-39-39-43-43XXXXXXXXXXXXXXXXk ➢14calculators/tolerances/tol?dev=k||K ➢01111222222333334444444550000000000000000m ➢15calculators/tolerances/tol?dev=m||M ➢2467788991111131315151517171720202121232326263030343440404848585868687676n ➢16calculators/tolerances/tol?dev=n||N ➢481012121515171720202323272727313131343437374040444450505656666678789292110110135135p ➢17calculators/tolerances/tol?dev=p||P ➢612151818222226263232373743434350505056566262686878788888100100120120140140170170195195240240r ➢18calculators/tolerances/tol?dev=r||R ➢101519232328283434414351546365687780849498108114126132150155175185210220250260300330370400440460550580s ➢19calculators/tolerances/tol?dev=s||S ➢14192328283535434353597179921001081221301401581701902082322522803103403804304705205806407208209201000110012501400t ➢20calculators/tolerances/tol?dev=t||T ➢000XXX4148546675911041221341461661801962182402682943303604004505005606206807808409601050120013501500165019002100u ➢21calculators/tolerances/tol?dev=u||U ➢1823283333414860708710212414417019021023625828431535039043549054060066074084094010501150130014501600185020002300250029003200v ➢22calculators/tolerances/tol?dev=v||V ➢000X39475568811021201461722022282522843103403854254755305956607408209201000115013001450160018002000230025002800310035003900x ➢23calculators/tolerances/tol?dev=x||X ➢202834404554648097122146178210248280310340385425475525590660740820XXXXXXXXXXXXXXXXy ➢24calculators/tolerances/tol?dev=y||Y ➢000XX6375941141441742142543003403804254705205806507308209201000XXXXXXXXXXXXXXXXz ➢25calculators/tolerances/tol?dev=z||Z ➢26354250607388112136172210258310365415465520575640710790900100011001250XXXXXXXXXXXXXXXXza ➢26calculators/tolerances/tol?dev=za||ZA ➢32425264779811814818022627433540047053560067074082092010001150130014501600XXXXXXXXXXXXXXXXEngineering FitsEngineering fit refers to the degree of tightness or looseness between two mating parts in an assembly. It is defined by combining a hole with a tolerance class and a shaft with a tolerance class. (See definition of terms above).Several standards define recommended pairings for different applications. The values presented in our charts and Calculator are based on ISO 286-1:2010 (In earlier revisions, it was separated into ISO 1829, which is now obsolete). In North America, additional fit combinations are sometimes used per ANSI B4.1 & B4.2. The ANSI tolerancing system is nearly equivalent to ISO 286 but not identical. The difference is typically 0.1-0.5 thous.Main Fit TypesClearance FitA clearance fit is a type in which the shaft is smaller than the hole it is inserted into, allowing for free movement, assembly, and disassembly. Clearance fits can range from loose-running for assemblies that need a significant gap for free movement or to accommodate temperature variation to locational clearance for stationary parts that need to be freely assembled/disassembled but still maintain accuracy.Transition FitA transition fit is a type in which the shaft may be slightly smaller or larger than the hole (before assembly). It is used to create a tight and secure connection between them in applications requiring high precision and stability. It provides high accuracy, but the connecting parts can be disassembled and reassembled without damage. However, force cannot be transmitted.Press Fit (Interference)An interference (Press) fit is a type in which the shaft is larger than the hole (before assembly). It creates a frictional force that holds the parts together without the need for additional fasteners or adhesives. The interference fit is commonly used in mechanical engineering to create solid and reliable connections between components that need to withstand heavy loads or vibrations. However, It is hard to disassemble without damaging the parts. Some degree of force can be transmitted between the components.Fits are also divided into two types of “basis”There are no technical differences between the two basis. Therefore the choice of the system should be based on economic reasons.Hole Basis FitsThe hole deviation is zero (meaning an H), and the shaft deviation varies to create different fit levels. For example, H9/d8 , H7/g6. It is the first choice of combinations for general use, since it avoids an unnecessary multiplicity of tools (e.g., reamers) and gaugesShaft Basis FitsThe shaft deviation is zero (meaning an h), and the hole deviation varies to create different fit levels. For example, D9/h9, G7/h6. This method should only be utilized when it offers clear economic benefits, such as in situations where it is required to assemble multiple parts with holes that have varying deviations onto a single shaft.Fits Standard Combinations ChartsFor ordinary engineering purposes, only a small number of the many (~150,000) possible fit combinations is required. ISO 286-1:2010 lists about 80 fit combinations that meet most of the needs of any engineering task. You can choose from this list or define a custom combination in our Fit Calculator.(*) In North America, additional fit combinations are sometimes used per ANSI B4.1 & B4.2. You can find below the ISO charts also the ANSI Charts.Click the Fit Link (e.g. G7/h6 ➢) to get its detailed tolerances in both Inch and millimetersHole Basis Fits (ISO 286-1)fit_typeFitFit LevelPreferedc_idfit_sortFit typeLeveliH10/b9 ➢DGNC1Clearance Fit6.00iH11/b11 ➢DGYC1Clearance Fit6.00iH10/c9 ➢DGNC1Clearance Fit5.00iH11/c11 ➢DGYC1Clearance Fit5.00iH8/d8 ➢GRNC1Clearance Fit4.00iH9/d8 ➢GRNC1Clearance Fit4.00iH10/d9 ➢GRYC1Clearance Fit4.00iH11/d10 ➢GRNC1Clearance Fit4.00iH10/e9 ➢GRNC1Clearance Fit3.00iH9/e8 ➢GRYC1Clearance Fit3.00iH8/e8 ➢GRYC1Clearance Fit3.00iH8/e7 ➢GRNC1Clearance Fit3.00iH7/f6 ➢LGNC1Clearance Fit2.00iH9/f8 ➢LGNC1Clearance Fit2.00iH8/f8 ➢LGNC1Clearance Fit2.00iH8/f7 ➢LGYC1Clearance Fit2.00iH7/g6 ➢LGYC1Clearance Fit1.00iH6/g5 ➢LGNC1Clearance Fit1.00iH10/h9 ➢LGYC1Clearance Fit0.00iH11/h10 ➢LGNC1Clearance Fit0.00iH9/h8 ➢LGNC1Clearance Fit0.00iH8/h8 ➢LGNC1Clearance Fit0.00iH6/h5 ➢LGNC1Clearance Fit0.00iH7/h6 ➢LGYC1Clearance Fit0.00iH8/h7 ➢LGYC1Clearance Fit-1.00iH6/js5 ➢orNT2Transition Fit-1.00iH7/js6 ➢orYT2Transition Fit-1.00iH8/k7 ➢orNT2Transition Fit-3.00iH6/k5 ➢orNT2Transition Fit-3.00iH7/k6 ➢orYT2Transition Fit-3.00iH7/m6 ➢orNT2Transition Fit-5.00iH6/m5 ➢orNT2Transition Fit-5.00iH8/m7 ➢orNT2Transition Fit-5.00iH7/n6 ➢orYT2Transition Fit-6.00iH8/js7 ➢orNT2Transition Fit-11.00iH6/n5 ➢LRNI3Press Fit (Interference)-6.00iH7/p6 ➢LRYI3Press Fit (Interference)-8.00iH6/p5 ➢LRNI3Press Fit (Interference)-8.00iH7/r6 ➢LRYI3Press Fit (Interference)-10.00iH7/s6 ➢RDYI3Press Fit (Interference)-11.00iH8/s7 ➢RDNI3Press Fit (Interference)-11.00iH7/t6 ➢RDNI3Press Fit (Interference)-12.00iH7/u6 ➢DRNI3Press Fit (Interference)-13.00iH8/u7 ➢DRNI3Press Fit (Interference)-13.00iH7/x6 ➢DRNI3Press Fit (Interference)-16.00Shaft Basis Fits (ISO 286-1)fit_typeFitFit LevelPreferedc_idfit_sortFit typeLeveliH10/b9 ➢DGNC1Clearance Fit6.00iH11/b11 ➢DGYC1Clearance Fit6.00iH10/c9 ➢DGNC1Clearance Fit5.00iH11/c11 ➢DGYC1Clearance Fit5.00iH8/d8 ➢GRNC1Clearance Fit4.00iH9/d8 ➢GRNC1Clearance Fit4.00iH10/d9 ➢GRYC1Clearance Fit4.00iH11/d10 ➢GRNC1Clearance Fit4.00iH10/e9 ➢GRNC1Clearance Fit3.00iH9/e8 ➢GRYC1Clearance Fit3.00iH8/e8 ➢GRYC1Clearance Fit3.00iH8/e7 ➢GRNC1Clearance Fit3.00iH7/f6 ➢LGNC1Clearance Fit2.00iH9/f8 ➢LGNC1Clearance Fit2.00iH8/f8 ➢LGNC1Clearance Fit2.00iH8/f7 ➢LGYC1Clearance Fit2.00iH7/g6 ➢LGYC1Clearance Fit1.00iH6/g5 ➢LGNC1Clearance Fit1.00iH10/h9 ➢LGYC1Clearance Fit0.00iH11/h10 ➢LGNC1Clearance Fit0.00iH9/h8 ➢LGNC1Clearance Fit0.00iH8/h8 ➢LGNC1Clearance Fit0.00iH6/h5 ➢LGNC1Clearance Fit0.00iH7/h6 ➢LGYC1Clearance Fit0.00iH8/h7 ➢LGYC1Clearance Fit-1.00iH6/js5 ➢orNT2Transition Fit-1.00iH7/js6 ➢orYT2Transition Fit-1.00iH8/k7 ➢orNT2Transition Fit-3.00iH6/k5 ➢orNT2Transition Fit-3.00iH7/k6 ➢orYT2Transition Fit-3.00iH7/m6 ➢orNT2Transition Fit-5.00iH6/m5 ➢orNT2Transition Fit-5.00iH8/m7 ➢orNT2Transition Fit-5.00iH7/n6 ➢orYT2Transition Fit-6.00iH8/js7 ➢orNT2Transition Fit-11.00iH6/n5 ➢LRNI3Press Fit (Interference)-6.00iH7/p6 ➢LRYI3Press Fit (Interference)-8.00iH6/p5 ➢LRNI3Press Fit (Interference)-8.00iH7/r6 ➢LRYI3Press Fit (Interference)-10.00iH7/s6 ➢RDYI3Press Fit (Interference)-11.00iH8/s7 ➢RDNI3Press Fit (Interference)-11.00iH7/t6 ➢RDNI3Press Fit (Interference)-12.00iH7/u6 ➢DRNI3Press Fit (Interference)-13.00iH8/u7 ➢DRNI3Press Fit (Interference)-13.00iH7/x6 ➢DRNI3Press Fit (Interference)-16.00Fit Combinations Per ANSI B4.1The tolerance classes mentioned in ANSI B4.1 (e.g., h9, g6, etc.) have the same nomenclature as in ISO 286. It could lead a confusion since the ANSI standard also defines the fundamental deviations and the tolerance grade on its own. The ANSI tolerancing system is nearly the same as the ISO 286 but not identical. If you take the values from the standard ISO charts or use our Online Calculator, you should expect about 0.1-0.5 thous errors. wdt_IDFit NameTolerance Class CombinationFit Typeth1RC 1H5/g4Running or Slidining Fits52RC 2H6/g5Running or Slidining Fits63RC 3H7/f6Running or Slidining Fits74RC 4H8/f7Running or Slidining Fits85RC 5H8/e7Running or Slidining Fits86RC 6H9/e8Running or Slidining Fits97RC 7H9/d8Running or Slidining Fits98RC 8H10/c9Running or Slidining Fits109RC 9H11/sh1Running or Slidining Fits1110LC 1H6/h5Clearance Location Fits611LC 2H7/h6Clearance Location Fits712LC 3H8/h7Clearance Location Fits813LC 4H10/h9Clearance Location Fits1014LC 5H7/g6Clearance Location Fits715LC 6H9/f8Clearance Location Fits916LC 7H10/e9Clearance Location Fits1017LC 8H10/d9Clearance Location Fits1018LC 9H11/c10Clearance Location Fits1119LC 10H12/sh2Clearance Location Fits1220LC 11H13/sh3Clearance Location Fits1321LT 1H7/js6Transition Fits722LT 2H8/js7Transition Fits823LT 3H7/k6Transition Fits724LT 4H8/k7Transition Fits825LT 5H7/n6Transition Fits726LT 6H7/n7Transition Fits727LN 1H6/n5Interference Location Fits628LN 2H7/p6Interference Location Fits729LN 3H7/r6Interference Location Fits730FN 1H6/sh4Force or Shrink Fits631FN 2H7/s6Force or Shrink Fits732FN 3H7/t6Force or Shrink Fits733FN 4H7/u6Force or Shrink Fits734FN 5H8/x7Force or Shrink Fits8Fit Combinations Per ANSI B4.2The tolerance classes mentioned in ANSI B4.1 (e.g., h9, g6, etc.) have the same nomenclature as in ISO 286. It could lead a confusion since the ANSI standard also defines the fundamental deviations and the tolerance grade on its own. The ANSI tolerancing system is nearly the same as the ISO 286 but not identical. If you take the values from the standard ISO charts or use our Online Calculator, you should expect about 0.1-0.5 thous errors.ClassificationHole BasisShaft BasisDescriptionClearanceH11/c11C11/h11Loose running fit for wide commercial tolerances or allowances on external members.H9/d9D9/h9Free running fit not for use where accuracy is essential, but good for large temperature variations, high running speeds, or heavy journal pressures.H8/f7F8/h7Close running fit for running on accurate machines and for accurate location at moderate speeds and journal pressures.H7/g6G7/h6Sliding fit not intended to run freely, but to move and turn freely and locate accurately.H7/h6H7/h6Locational clearance fit provides snug fit for locating stationary parts; but can be freely assembled and disassembled.InterferenceH7/k6K7/h6Locational transition fit for accurate location, a compromise between clearance and interference.H7/n6N7/h6Locational transition fit for more accurate location where greater interference is permissible.TransitionH7/p6P7/h6Locational interference fit for parts requiring rigidity and alignment with prime accuracy of location but without special bore pressure requirements.H7/s6S7/h6Medium drive fit for ordinary steel parts or shrink fits on light sections, the tightest fit usable with cast iron.H7/u6U7/h6Force fit suitable for parts which can be highly stressed or for shrink fits where the heavy pressing forces required are impractical.Related Glossary Terms:Thou

There are no technical differences between the two basis. Therefore the choice of the system should be based on economic reasons.Hole Basis FitsThe hole deviation is zero (meaning an H), and the shaft deviation varies to create different fit levels. For example, H9/d8 , H7/g6. It is the first choice of combinations for general use, since it avoids an unnecessary multiplicity of tools (e.g., reamers) and gaugesShaft Basis FitsThe shaft deviation is zero (meaning an h), and the hole deviation varies to create different fit levels. For example, D9/h9, G7/h6. This method should only be utilized when it offers clear economic benefits, such as in situations where it is required to assemble multiple parts with holes that have varying deviations onto a single shaft.Fits Standard Combinations ChartsFor ordinary engineering purposes, only a small number of the many (~150,000) possible fit combinations is required. ISO 286-1:2010 lists about 80 fit combinations that meet most of the needs of any engineering task. You can choose from this list or define a custom combination in our Fit Calculator.(*) In North America, additional fit combinations are sometimes used per ANSI B4.1 & B4.2. You can find below the ISO charts also the ANSI Charts.Click the Fit Link (e.g. G7/h6 ➢) to get its detailed tolerances in both Inch and millimetersHole Basis Fits (ISO 286-1)fit_typeFitFit LevelPreferedc_idfit_sortFit typeLeveliH10/b9 ➢DGNC1Clearance Fit6.00iH11/b11 ➢DGYC1Clearance Fit6.00iH10/c9 ➢DGNC1Clearance Fit5.00iH11/c11 ➢DGYC1Clearance Fit5.00iH8/d8 ➢GRNC1Clearance Fit4.00iH9/d8 ➢GRNC1Clearance Fit4.00iH10/d9 ➢GRYC1Clearance Fit4.00iH11/d10 ➢GRNC1Clearance Fit4.00iH10/e9 ➢GRNC1Clearance Fit3.00iH9/e8 ➢GRYC1Clearance Fit3.00iH8/e8 ➢GRYC1Clearance Fit3.00iH8/e7 ➢GRNC1Clearance Fit3.00iH7/f6 ➢LGNC1Clearance Fit2.00iH9/f8 ➢LGNC1Clearance Fit2.00iH8/f8 ➢LGNC1Clearance Fit2.00iH8/f7 ➢LGYC1Clearance Fit2.00iH7/g6 ➢LGYC1Clearance Fit1.00iH6/g5 ➢LGNC1Clearance Fit1.00iH10/h9 ➢LGYC1Clearance Fit0.00iH11/h10 ➢LGNC1Clearance Fit0.00iH9/h8 ➢LGNC1Clearance Fit0.00iH8/h8 ➢LGNC1Clearance Fit0.00iH6/h5 ➢LGNC1Clearance Fit0.00iH7/h6 ➢LGYC1Clearance Fit0.00iH8/h7 ➢LGYC1Clearance Fit-1.00iH6/js5 ➢orNT2Transition Fit-1.00iH7/js6 ➢orYT2Transition Fit-1.00iH8/k7 ➢orNT2Transition Fit-3.00iH6/k5 ➢orNT2Transition Fit-3.00iH7/k6 ➢orYT2Transition Fit-3.00iH7/m6 ➢orNT2Transition Fit-5.00iH6/m5 ➢orNT2Transition Fit-5.00iH8/m7 ➢orNT2Transition Fit-5.00iH7/n6 ➢orYT2Transition Fit-6.00iH8/js7 ➢orNT2Transition Fit-11.00iH6/n5 ➢LRNI3Press Fit (Interference)-6.00iH7/p6 ➢LRYI3Press Fit (Interference)-8.00iH6/p5 ➢LRNI3Press Fit (Interference)-8.00iH7/r6 ➢LRYI3Press Fit (Interference)-10.00iH7/s6 ➢RDYI3Press Fit (Interference)-11.00iH8/s7 ➢RDNI3Press Fit (Interference)-11.00iH7/t6 ➢RDNI3Press Fit (Interference)-12.00iH7/u6 ➢DRNI3Press Fit (Interference)-13.00iH8/u7 ➢DRNI3Press Fit (Interference)-13.00iH7/x6 ➢DRNI3Press Fit (Interference)-16.00Shaft Basis Fits (ISO 286-1)fit_typeFitFit LevelPreferedc_idfit_sortFit typeLeveliH10/b9 ➢DGNC1Clearance Fit6.00iH11/b11 ➢DGYC1Clearance Fit6.00iH10/c9 ➢DGNC1Clearance Fit5.00iH11/c11 ➢DGYC1Clearance Fit5.00iH8/d8 ➢GRNC1Clearance Fit4.00iH9/d8 ➢GRNC1Clearance Fit4.00iH10/d9 ➢GRYC1Clearance Fit4.00iH11/d10 ➢GRNC1Clearance Fit4.00iH10/e9 ➢GRNC1Clearance Fit3.00iH9/e8 ➢GRYC1Clearance Fit3.00iH8/e8 ➢GRYC1Clearance Fit3.00iH8/e7 ➢GRNC1Clearance Fit3.00iH7/f6 ➢LGNC1Clearance Fit2.00iH9/f8 ➢LGNC1Clearance Fit2.00iH8/f8 ➢LGNC1Clearance Fit2.00iH8/f7 ➢LGYC1Clearance Fit2.00iH7/g6 ➢LGYC1Clearance Fit1.00iH6/g5 ➢LGNC1Clearance Fit1.00iH10/h9 ➢LGYC1Clearance Fit0.00iH11/h10 ➢LGNC1Clearance Fit0.00iH9/h8 ➢LGNC1Clearance Fit0.00iH8/h8 ➢LGNC1Clearance Fit0.00iH6/h5 ➢LGNC1Clearance Fit0.00iH7/h6 ➢LGYC1Clearance Fit0.00iH8/h7 ➢LGYC1Clearance Fit-1.00iH6/js5 ➢orNT2Transition Fit-1.00iH7/js6 ➢orYT2Transition Fit-1.00iH8/k7 ➢orNT2Transition Fit-3.00iH6/k5 ➢orNT2Transition Fit-3.00iH7/k6 ➢orYT2Transition Fit-3.00iH7/m6 ➢orNT2Transition Fit-5.00iH6/m5 ➢orNT2Transition Fit-5.00iH8/m7 ➢orNT2Transition Fit-5.00iH7/n6 ➢orYT2Transition Fit-6.00iH8/js7 ➢orNT2Transition Fit-11.00iH6/n5 ➢LRNI3Press Fit (Interference)-6.00iH7/p6 ➢LRYI3Press Fit (Interference)-8.00iH6/p5 ➢LRNI3Press Fit (Interference)-8.00iH7/r6 ➢LRYI3Press Fit (Interference)-10.00iH7/s6 ➢RDYI3Press Fit (Interference)-11.00iH8/s7 ➢RDNI3Press Fit (Interference)-11.00iH7/t6 ➢RDNI3Press Fit (Interference)-12.00iH7/u6 ➢DRNI3Press Fit (Interference)-13.00iH8/u7 ➢DRNI3Press Fit (Interference)-13.00iH7/x6 ➢DRNI3Press Fit (Interference)-16.00Fit Combinations Per ANSI B4.1The tolerance classes mentioned in ANSI B4.1 (e.g., h9, g6, etc.) have the same nomenclature as in ISO 286. It could lead a confusion since the ANSI standard also defines the fundamental deviations and the tolerance grade on its own. The ANSI tolerancing system is nearly the same as the ISO 286 but not identical. If you take the values from the standard ISO charts or use our Online Calculator, you should expect about 0.1-0.5 thous errors. wdt_IDFit NameTolerance Class CombinationFit Typeth1RC 1H5/g4Running or Slidining Fits52RC 2H6/g5Running or Slidining Fits63RC 3H7/f6Running or Slidining Fits74RC 4H8/f7Running or Slidining Fits85RC 5H8/e7Running or Slidining Fits86RC 6H9/e8Running or Slidining Fits97RC 7H9/d8Running or Slidining Fits98RC 8H10/c9Running or Slidining Fits109RC 9H11/sh1Running or Slidining Fits1110LC 1H6/h5Clearance Location Fits611LC 2H7/h6Clearance Location Fits712LC 3H8/h7Clearance Location Fits813LC 4H10/h9Clearance Location Fits1014LC 5H7/g6Clearance Location Fits715LC 6H9/f8Clearance Location Fits916LC 7H10/e9Clearance Location Fits1017LC 8H10/d9Clearance Location Fits1018LC 9H11/c10Clearance Location Fits1119LC 10H12/sh2Clearance Location Fits1220LC 11H13/sh3Clearance Location Fits1321LT 1H7/js6Transition Fits722LT 2H8/js7Transition Fits823LT 3H7/k6Transition Fits724LT 4H8/k7Transition Fits825LT 5H7/n6Transition Fits726LT 6H7/n7Transition Fits727LN 1H6/n5Interference Location Fits628LN 2H7/p6Interference Location Fits729LN 3H7/r6Interference Location Fits730FN 1H6/sh4Force or Shrink Fits631FN 2H7/s6Force or Shrink Fits732FN 3H7/t6Force or Shrink Fits733FN 4H7/u6Force or Shrink Fits734FN 5H8/x7Force or Shrink Fits8Fit Combinations Per ANSI B4.2The tolerance classes mentioned in ANSI B4.1 (e.g., h9, g6, etc.) have the same nomenclature as in ISO 286. It could lead a confusion since the ANSI standard also defines the fundamental deviations and the tolerance grade on its own. The ANSI tolerancing system is nearly the same as the ISO 286 but not identical. If you take the values from the standard ISO charts or use our Online Calculator, you should expect about 0.1-0.5 thous errors.ClassificationHole BasisShaft BasisDescriptionClearanceH11/c11C11/h11Loose running fit for wide commercial tolerances or allowances on external members.H9/d9D9/h9Free running fit not for use where accuracy is essential, but good for large temperature variations, high running speeds, or heavy journal pressures.H8/f7F8/h7Close running fit for running on accurate machines and for accurate location at moderate speeds and journal pressures.H7/g6G7/h6Sliding fit not intended to run freely, but to move and turn freely and locate accurately.H7/h6H7/h6Locational clearance fit provides snug fit for locating stationary parts; but can be freely assembled and disassembled.InterferenceH7/k6K7/h6Locational transition fit for accurate location, a compromise between clearance and interference.H7/n6N7/h6Locational transition fit for more accurate location where greater interference is permissible.TransitionH7/p6P7/h6Locational interference fit for parts requiring rigidity and alignment with prime accuracy of location but without special bore pressure requirements.H7/s6S7/h6Medium drive fit for ordinary steel parts or shrink fits on light sections, the tightest fit usable with cast iron.H7/u6U7/h6Force fit suitable for parts which can be highly stressed or for shrink fits where the heavy pressing forces required are impractical.Related Glossary Terms:Thou

Limits are the basic size’s high (Upper limit) and low (Lower limit) values. For example, if the lower limit of a hole is 25.05 mm and the upper limit of the same hole is 25.15 mm, then a hole that is 25.1 mm in diameter is within limits and is acceptable. The limits are the final result obtained from the tolerance system based on the nominal size and tolerance class.ShaftShaft refers to an external feature of a workpiece, typically cylindrical in shape. However, the term can be used to describe any external feature. For example, a block that has to fit into a keyway or the square shank of a cutting tool can also be referred to as a shaft.HoleHole refers to an internal feature of a workpiece, typically a bore. However, the term can be used to describe any internal feature. For example, a keyway.Fundamental DeviationFundamental Deviation is The position of the tolerance zone in relation to the zero line (Also referred to as basic size or nominal size). The fundamental deviation is measured to the point that is nearest to the zero line. A 1-2 character letter code (e.g. G, js, are used to indicate it. Holes are marked by capital letters, and shafts by small letters. For example, “G” is a fundamental deviation of a hole, and “js” is a fundamental deviation of a shaft.The size of the deviation depends on its letter code and the nominal size.Values are listed in the below table.Check out our below infographic for easier understanding.Upper & lower DeviationsThe algebraic difference between the upper limit and the basic size is called the upper deviation and is denoted by es for shafts and ES for holes. The algebraic difference between the lower limit and the basic size is called the lower deviation and is represented by ei for shafts and EI for holes. The configurations may be confusing and depend if the feature is external or internal and if the deviation is negative, positive, or zero.Deviation SymbolA-GHes=0,ei=ITEI=0, ES=ITJSei=es=IT/2EI=ES=IT/2K-ZToleranceTolerance is the difference between the limits of size. That is the upper limit minus the lower limit.Standard Tolerance Grade: A number between 0 to 18 and designated as “IT” (e.g. IT7). A lower IT means higher accuracy. The value of each IT also depends on the basic size. You can find the values in the below chart.The IS0 system provides 20 standard tolerance grades, of which IT1 to IT18 are considered general use. In addition, there are two complementary grades, IT01 and IT0. The collection of charts provided in ISO 286-2 covers only IT1-IT18.Tolerance Class: The term used for the combination of a fundamental deviation with a standard tolerance grade, e.g. h9, D13, etc.All the above terms are summarized in the below infographics(*) Click to enlargeNomenclatureStandard Tolerance GradesThe standard tolerance grades are designated by the letters IT followed by a number, for example, IT7. When the tolerance grade is associated with a fundamental deviation symbol to form a tolerance class, the letters IT are omitted (e.g., h7, JS5)Fundamental DeviationA 1-2 letter code represents the fundamental deviation. Upper case (e.g., G, JS) designates hole deviations, while lower case (e.g., g, js) designates shaft deviations.Tolerance ClassThe tolerance class is designated by the letter(s) representing the fundamental deviation followed by the standard tolerance grade number. For example, a shaft with a deviation of g and a tolerance grade of T11 will be denoted as g11. A hole with a deviation of JS and a tolerance grade of IT7 will be represented as JS7.Tolerance SizeThe tolerance size combines the basic size with the tolerance class, designated by the basic size, followedby the designation of the required tolerance class (without spaces). For example, 32H7 specifies a hole with a nominal size of 32 mm, deviation H, and tolerance grade of IT7.Tolerances ChartsStandard Tolerance Grades (IT) ChartTolerance Dimensions in MicronsTo convert to millimeters, divide by 1000To convert to Thous, divide by 25.4 wdt_IDDiameter Range (mm)(Inches)IT01IT0IT1IT2IT3IT4IT5IT6IT7IT8IT9IT10IT11IT12IT13IT14IT15IT16IT17IT1810 - 30 - 0.120.30.50.81.2234610142540601001402504006001000140023 - 60.12 - 0.240.40.611.52.545812183048751201803004807501200180036 - 100.24 - 0.40.40.611.52.5469152236589015022036058090015002200410 - 180.4 - 0.710.50.81.223581118274370110180270430700110018002700518 - 300.71 - 1.190.611.52.54691321335284130210330520840130021003300630 - 501.19 - 1.970.611.52.54711162539621001602503906201000160025003900750 - 801.97 - 3.150.81.2235813193046741201903004607401200190030004600880 - 1203.15 - 4.7311.52.54610152235548714022035054087014002200350054009120 - 1804.73 - 7.091.223.55812182540631001602504006301000160025004000630010180 - 2507.09 - 9.85234.571014202946721151852904607201150185029004600720011250 - 3159.85 - 12.412.54681216233252811302103205208101300210032005200810012315 - 40012.41 - 15.7535791318253657891402303605708901400230036005700890013400 - 50015.75 - 19.7468101520274063971552504006309701550250040006300970014500 - 63019.7 - 24.84.569111622324470110175280440700110017502800440070001100015630 - 80024.8 - 31.55710131825365080125200320500800125020003200500080001250016800 - 100031.5 - 39.45.58111521284056901402303605609001400230036005600900014000171000 - 125039.4 - 49.26.59131824334766105165260420660105016502600420066001050016500181250 - 160049.2 - 63811152129395578125195310500780125019503100500078001250019500191600 - 200063 - 78.7913182535466592150230370600920150023003700600092001500023000202000 - 250078.7 - 98.4111522304155781101752804407001100175028004400700011001750028000212500 - 315098.4 - 1241318263650689613521033054086013502100330054008600135002100033000Fundamental deviation of holes ChartClick the Tolerance Link (e.g., H ➢) to get the Full & Accurate charts for a specific deviation in Inch and Metric unitsClick  icons to show all columns for the entire diameter range (0-3,150 mm)The deviations of J through Z also depend on the IT Therefore, the values in the below table are only accurate in some cases. To get the correct value in all cases, click the Tolerance Link (e.g., H ➢).Dimentions in Microns. To convert to millimeters, divide by 1000, to Thous, divide by 25.4 Deviationidurl0 - 3 mm3 - 6 mm6 - 1010 - 1414 - 1818 - 2424 - 3030 - 4040 - 5050 - 6565 - 8080 - 100100 - 120120 - 140140 - 160160 - 180180 - 200200 - 225225 - 250250 - 280280 - 315315 - 355355 - 400400 - 450450 - 500500 - 560560 - 630630 - 710710 - 800800 - 900900 - 10001000 - 11201120 - 12501250 - 14001400 - 16001600 - 18001800 - 20002000 - 22402240 - 25002500 - 28002800 - 3150A ➢1calculators/tolerances/tol?dev=a||A ➢27027028029029030030031032034036038041046052058066074082092010501200135015001650XXXXXXXXXXXXXXXXB ➢2calculators/tolerances/tol?dev=b||B ➢140140150150150160160170180190200220240260280310340380420480540600680760840XXXXXXXXXXXXXXXXC ➢3calculators/tolerances/tol?dev=c||C ➢6070809595110110120130140150170180200210230240260280300330360400440480520580640700780860940105011501300145016001800200022002500CD ➢4calculators/tolerances/tol?dev=cd||CD ➢344656XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXD ➢5calculators/tolerances/tol?dev=d||D ➢203040505065658080100100120120145145145170170170190190210210230230260260290290320320350350390390430430480480520520E ➢6calculators/tolerances/tol?dev=e||E ➢14202532324040505060607272858585100100100110110125125135135145145160160170170195195220220240240260260290290EF ➢7calculators/tolerances/tol?dev=ef||EF ➢101418XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXF ➢8calculators/tolerances/tol?dev=f||F ➢61013161620202525303036364343435050505656626268687676808086869898110110120120130130145145FG ➢9calculators/tolerances/tol?dev=fg||FG ➢468XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXG ➢10calculators/tolerances/tol?dev=g||G ➢2456677991010121214141415151517171818202022222424262628283030323234343838H ➢11calculators/tolerances/tol?dev=h||H ➢00000000000000000000000000000000000000000JS ➢12calculators/tolerances/tol?dev=js||JS ➢00000000000000000000000000000000000000000J ➢13calculators/tolerances/tol?dev=j||J ➢46810101212141418182222262626303030363639394343XXXXXXXXXXXXXXXXK ➢14calculators/tolerances/tol?dev=k||K ➢0-1-1-1-1-2-2-2-2-2-2-3-3-3-3-3-4-4-4-4-4-4-4-5-50000000000000000M ➢15calculators/tolerances/tol?dev=m||M ➢-2-4-6-7-7-8-8-9-9-11-11-13-13-15-15-15-17-17-17-20-20-21-21-23-23-26-26-30-30-34-34-40-40-48-48-58-58-68-68-76-76N ➢16calculators/tolerances/tol?dev=n||N ➢-4-8-10-12-12-15-15-17-17-20-20-23-23-27-27-27-31-31-31-34-34-37-37-40-40-44-44-50-50-56-56-66-66-78-78-92-92-110-110-135-135P ➢17calculators/tolerances/tol?dev=p||P ➢-6-12-15-18-18-22-22-26-26-32-32-37-37-43-43-43-50-50-50-56-56-62-62-68-68-78-78-88-88-100-100-120-120-140-140-170-170-195-195-240-240R ➢18calculators/tolerances/tol?dev=r||R ➢-10-15-19-23-23-28-28-34-34-41-43-51-54-63-65-68-77-80-84-94-98-108-114-126-132-150-155-175-185-210-220-250-260-300-330-370-400-440-460-550-580S ➢19calculators/tolerances/tol?dev=s||S ➢-14-19-23-28-28-35-35-43-43-53-59-71-79-92-100-108-122-130-140-158-170-190-208-232-252-280-310-340-380-430-470-520-580-640-720-820-920-1000-1100-1250-1400T ➢20calculators/tolerances/tol?dev=t||T ➢000XXX-41-48-54-66-75-91-104-122-134-146-166-180-196-218-240-268-294-330-360-400-450-500-560-620-680-780-840-960-1050-1200-1350-1500-1650-1900-2100U ➢21calculators/tolerances/tol?dev=u||U ➢-18-23-28-33-33-41-48-60-70-87-102-124-144-170-190-210-236-258-284-315-350-390-435-490-540-600-660-740-840-940-1050-1150-1300-1450-1600-1850-2000-2300-2500-2900-3200V ➢22calculators/tolerances/tol?dev=v||V ➢000X-39-47-55-68-81-102-120-146-172-202-228-252-284-310-340-385-425-475-530-595-660-740-820-920-1000-1150-1300-1450-1600-1800-2000-2300-2500-2800-3100-3500-3900X ➢23calculators/tolerances/tol?dev=x||X ➢-20-28-34-40-45-54-64-80-97-122-146-178-210-248-280-310-340-385-425-475-525-590-660-740-820XXXXXXXXXXXXXXXXY ➢24calculators/tolerances/tol?dev=y||Y ➢000XX-63-75-94-114-144-174-214-254-300-340-380-425-470-520-580-650-730-820-920-1000XXXXXXXXXXXXXXXXZ ➢25calculators/tolerances/tol?dev=z||Z ➢-26-35-42-50-60-73-88-112-136-172-210-258-310-365-415-465-520-575-640-710-790-900-1000-1100-1250XXXXXXXXXXXXXXXXZA ➢26calculators/tolerances/tol?dev=za||ZA ➢-32-42-52-64-77-98-118-148-180-226-274-335-400-470-535-600-670-740-820-920-1000-1150-1300-1450-1600XXXXXXXXXXXXXXXXFundamental deviation of shafts ChartClick the Tolerance Link (e.g., g ➢) to get the Full & Accurate charts for a specific deviation in Inch and Metric unitsClick  icons to show all columns of the entire diameter range (0-3,150 mm)The deviations of J through Z also depend on the IT Therefore, the values in the below table are only accurate in some cases. To get the correct value in all cases, click the Tolerance Link (e.g., g ➢).Dimentions in Microns. To convert to millimeters, divide by 1000, to Thous, divide by 25.4 Deviationidurl0 - 3 mm3 - 6 mm6 - 1010 - 1414 - 1818 - 2424 - 3030 - 4040 - 5050 - 6565 - 8080 - 100100 - 120120 - 140140 - 160160 - 180180 - 200200 - 225225 - 250250 - 280280 - 315315 - 355355 - 400400 - 450450 - 500500 - 560560 - 630630 - 710710 - 800800 - 900900 - 10001000 - 11201120 - 12501250 - 14001400 - 16001600 - 18001800 - 20002000 - 22402240 - 25002500 - 28002800 - 3150a ➢1calculators/tolerances/tol?dev=a||A ➢-270-270-280-290-290-300-300-310-320-340-360-380-410-460-520-580-660-740-820-920-1050-1200-1350-1500-1650XXXXXXXXXXXXXXXXb ➢2calculators/tolerances/tol?dev=b||B ➢-140-140-150-150-150-160-160-170-180-190-200-220-240-260-280-310-340-380-420-480-540-600-680-760-840XXXXXXXXXXXXXXXXc ➢3calculators/tolerances/tol?dev=c||C ➢-60-70-80-95-95-110-110-120-130-140-150-170-180-200-210-230-240-260-280-300-330-360-400-440-480-520-580-640-700-780-860-940-1050-1150-1300-1450-1600-1800-2000-2200-2500cd ➢4calculators/tolerances/tol?dev=cd||CD ➢-34-46-56XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXd ➢5calculators/tolerances/tol?dev=d||D ➢-20-30-40-50-50-65-65-80-80-100-100-120-120-145-145-145-170-170-170-190-190-210-210-230-230-260-260-290-290-320-320-350-350-390-390-430-430-480-480-520-520e ➢6calculators/tolerances/tol?dev=e||E ➢-14-20-25-32-32-40-40-50-50-60-60-72-72-85-85-85-100-100-100-110-110-125-125-135-135-145-145-160-160-170-170-195-195-220-220-240-240-260-260-290-290ef ➢7calculators/tolerances/tol?dev=ef||EF ➢-10-14-18XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXf ➢8calculators/tolerances/tol?dev=f||F ➢-6-10-13-16-16-20-20-25-25-30-30-36-36-43-43-43-50-50-50-56-56-62-62-68-68-76-76-80-80-86-86-98-98-110-110-120-120-130-130-145-145fg ➢9calculators/tolerances/tol?dev=fg||FG ➢-4-6-8XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXg ➢10calculators/tolerances/tol?dev=g||G ➢-2-4-5-6-6-7-7-9-9-10-10-12-12-14-14-14-15-15-15-17-17-18-18-20-20-22-22-24-24-26-26-28-28-30-30-32-32-34-34-38-38h ➢11calculators/tolerances/tol?dev=h||H ➢00000000000000000000000000000000000000000js ➢12calculators/tolerances/tol?dev=js||JS ➢00000000000000000000000000000000000000000j ➢13calculators/tolerances/tol?dev=j||J ➢-4-6-8-10-10-12-12-14-14-18-18-22-22-26-26-26-30-30-30-36-36-39-39-43-43XXXXXXXXXXXXXXXXk ➢14calculators/tolerances/tol?dev=k||K ➢01111222222333334444444550000000000000000m ➢15calculators/tolerances/tol?dev=m||M ➢2467788991111131315151517171720202121232326263030343440404848585868687676n ➢16calculators/tolerances/tol?dev=n||N ➢481012121515171720202323272727313131343437374040444450505656666678789292110110135135p ➢17calculators/tolerances/tol?dev=p||P ➢612151818222226263232373743434350505056566262686878788888100100120120140140170170195195240240r ➢18calculators/tolerances/tol?dev=r||R ➢101519232328283434414351546365687780849498108114126132150155175185210220250260300330370400440460550580s ➢19calculators/tolerances/tol?dev=s||S ➢14192328283535434353597179921001081221301401581701902082322522803103403804304705205806407208209201000110012501400t ➢20calculators/tolerances/tol?dev=t||T ➢000XXX4148546675911041221341461661801962182402682943303604004505005606206807808409601050120013501500165019002100u ➢21calculators/tolerances/tol?dev=u||U ➢1823283333414860708710212414417019021023625828431535039043549054060066074084094010501150130014501600185020002300250029003200v ➢22calculators/tolerances/tol?dev=v||V ➢000X39475568811021201461722022282522843103403854254755305956607408209201000115013001450160018002000230025002800310035003900x ➢23calculators/tolerances/tol?dev=x||X ➢202834404554648097122146178210248280310340385425475525590660740820XXXXXXXXXXXXXXXXy ➢24calculators/tolerances/tol?dev=y||Y ➢000XX6375941141441742142543003403804254705205806507308209201000XXXXXXXXXXXXXXXXz ➢25calculators/tolerances/tol?dev=z||Z ➢26354250607388112136172210258310365415465520575640710790900100011001250XXXXXXXXXXXXXXXXza ➢26calculators/tolerances/tol?dev=za||ZA ➢32425264779811814818022627433540047053560067074082092010001150130014501600XXXXXXXXXXXXXXXXEngineering FitsEngineering fit refers to the degree of tightness or looseness between two mating parts in an assembly. It is defined by combining a hole with a tolerance class and a shaft with a tolerance class. (See definition of terms above).Several standards define recommended pairings for different applications. The values presented in our charts and Calculator are based on ISO 286-1:2010 (In earlier revisions, it was separated into ISO 1829, which is now obsolete). In North America, additional fit combinations are sometimes used per ANSI B4.1 & B4.2. The ANSI tolerancing system is nearly equivalent to ISO 286 but not identical. The difference is typically 0.1-0.5 thous.Main Fit TypesClearance FitA clearance fit is a type in which the shaft is smaller than the hole it is inserted into, allowing for free movement, assembly, and disassembly. Clearance fits can range from loose-running for assemblies that need a significant gap for free movement or to accommodate temperature variation to locational clearance for stationary parts that need to be freely assembled/disassembled but still maintain accuracy.Transition FitA transition fit is a type in which the shaft may be slightly smaller or larger than the hole (before assembly). It is used to create a tight and secure connection between them in applications requiring high precision and stability. It provides high accuracy, but the connecting parts can be disassembled and reassembled without damage. However, force cannot be transmitted.Press Fit (Interference)An interference (Press) fit is a type in which the shaft is larger than the hole (before assembly). It creates a frictional force that holds the parts together without the need for additional fasteners or adhesives. The interference fit is commonly used in mechanical engineering to create solid and reliable connections between components that need to withstand heavy loads or vibrations. However, It is hard to disassemble without damaging the parts. Some degree of force can be transmitted between the components.Fits are also divided into two types of “basis”There are no technical differences between the two basis. Therefore the choice of the system should be based on economic reasons.Hole Basis FitsThe hole deviation is zero (meaning an H), and the shaft deviation varies to create different fit levels. For example, H9/d8 , H7/g6. It is the first choice of combinations for general use, since it avoids an unnecessary multiplicity of tools (e.g., reamers) and gaugesShaft Basis FitsThe shaft deviation is zero (meaning an h), and the hole deviation varies to create different fit levels. For example, D9/h9, G7/h6. This method should only be utilized when it offers clear economic benefits, such as in situations where it is required to assemble multiple parts with holes that have varying deviations onto a single shaft.Fits Standard Combinations ChartsFor ordinary engineering purposes, only a small number of the many (~150,000) possible fit combinations is required. ISO 286-1:2010 lists about 80 fit combinations that meet most of the needs of any engineering task. You can choose from this list or define a custom combination in our Fit Calculator.(*) In North America, additional fit combinations are sometimes used per ANSI B4.1 & B4.2. You can find below the ISO charts also the ANSI Charts.Click the Fit Link (e.g. G7/h6 ➢) to get its detailed tolerances in both Inch and millimetersHole Basis Fits (ISO 286-1)fit_typeFitFit LevelPreferedc_idfit_sortFit typeLeveliH10/b9 ➢DGNC1Clearance Fit6.00iH11/b11 ➢DGYC1Clearance Fit6.00iH10/c9 ➢DGNC1Clearance Fit5.00iH11/c11 ➢DGYC1Clearance Fit5.00iH8/d8 ➢GRNC1Clearance Fit4.00iH9/d8 ➢GRNC1Clearance Fit4.00iH10/d9 ➢GRYC1Clearance Fit4.00iH11/d10 ➢GRNC1Clearance Fit4.00iH10/e9 ➢GRNC1Clearance Fit3.00iH9/e8 ➢GRYC1Clearance Fit3.00iH8/e8 ➢GRYC1Clearance Fit3.00iH8/e7 ➢GRNC1Clearance Fit3.00iH7/f6 ➢LGNC1Clearance Fit2.00iH9/f8 ➢LGNC1Clearance Fit2.00iH8/f8 ➢LGNC1Clearance Fit2.00iH8/f7 ➢LGYC1Clearance Fit2.00iH7/g6 ➢LGYC1Clearance Fit1.00iH6/g5 ➢LGNC1Clearance Fit1.00iH10/h9 ➢LGYC1Clearance Fit0.00iH11/h10 ➢LGNC1Clearance Fit0.00iH9/h8 ➢LGNC1Clearance Fit0.00iH8/h8 ➢LGNC1Clearance Fit0.00iH6/h5 ➢LGNC1Clearance Fit0.00iH7/h6 ➢LGYC1Clearance Fit0.00iH8/h7 ➢LGYC1Clearance Fit-1.00iH6/js5 ➢orNT2Transition Fit-1.00iH7/js6 ➢orYT2Transition Fit-1.00iH8/k7 ➢orNT2Transition Fit-3.00iH6/k5 ➢orNT2Transition Fit-3.00iH7/k6 ➢orYT2Transition Fit-3.00iH7/m6 ➢orNT2Transition Fit-5.00iH6/m5 ➢orNT2Transition Fit-5.00iH8/m7 ➢orNT2Transition Fit-5.00iH7/n6 ➢orYT2Transition Fit-6.00iH8/js7 ➢orNT2Transition Fit-11.00iH6/n5 ➢LRNI3Press Fit (Interference)-6.00iH7/p6 ➢LRYI3Press Fit (Interference)-8.00iH6/p5 ➢LRNI3Press Fit (Interference)-8.00iH7/r6 ➢LRYI3Press Fit (Interference)-10.00iH7/s6 ➢RDYI3Press Fit (Interference)-11.00iH8/s7 ➢RDNI3Press Fit (Interference)-11.00iH7/t6 ➢RDNI3Press Fit (Interference)-12.00iH7/u6 ➢DRNI3Press Fit (Interference)-13.00iH8/u7 ➢DRNI3Press Fit (Interference)-13.00iH7/x6 ➢DRNI3Press Fit (Interference)-16.00Shaft Basis Fits (ISO 286-1)fit_typeFitFit LevelPreferedc_idfit_sortFit typeLeveliH10/b9 ➢DGNC1Clearance Fit6.00iH11/b11 ➢DGYC1Clearance Fit6.00iH10/c9 ➢DGNC1Clearance Fit5.00iH11/c11 ➢DGYC1Clearance Fit5.00iH8/d8 ➢GRNC1Clearance Fit4.00iH9/d8 ➢GRNC1Clearance Fit4.00iH10/d9 ➢GRYC1Clearance Fit4.00iH11/d10 ➢GRNC1Clearance Fit4.00iH10/e9 ➢GRNC1Clearance Fit3.00iH9/e8 ➢GRYC1Clearance Fit3.00iH8/e8 ➢GRYC1Clearance Fit3.00iH8/e7 ➢GRNC1Clearance Fit3.00iH7/f6 ➢LGNC1Clearance Fit2.00iH9/f8 ➢LGNC1Clearance Fit2.00iH8/f8 ➢LGNC1Clearance Fit2.00iH8/f7 ➢LGYC1Clearance Fit2.00iH7/g6 ➢LGYC1Clearance Fit1.00iH6/g5 ➢LGNC1Clearance Fit1.00iH10/h9 ➢LGYC1Clearance Fit0.00iH11/h10 ➢LGNC1Clearance Fit0.00iH9/h8 ➢LGNC1Clearance Fit0.00iH8/h8 ➢LGNC1Clearance Fit0.00iH6/h5 ➢LGNC1Clearance Fit0.00iH7/h6 ➢LGYC1Clearance Fit0.00iH8/h7 ➢LGYC1Clearance Fit-1.00iH6/js5 ➢orNT2Transition Fit-1.00iH7/js6 ➢orYT2Transition Fit-1.00iH8/k7 ➢orNT2Transition Fit-3.00iH6/k5 ➢orNT2Transition Fit-3.00iH7/k6 ➢orYT2Transition Fit-3.00iH7/m6 ➢orNT2Transition Fit-5.00iH6/m5 ➢orNT2Transition Fit-5.00iH8/m7 ➢orNT2Transition Fit-5.00iH7/n6 ➢orYT2Transition Fit-6.00iH8/js7 ➢orNT2Transition Fit-11.00iH6/n5 ➢LRNI3Press Fit (Interference)-6.00iH7/p6 ➢LRYI3Press Fit (Interference)-8.00iH6/p5 ➢LRNI3Press Fit (Interference)-8.00iH7/r6 ➢LRYI3Press Fit (Interference)-10.00iH7/s6 ➢RDYI3Press Fit (Interference)-11.00iH8/s7 ➢RDNI3Press Fit (Interference)-11.00iH7/t6 ➢RDNI3Press Fit (Interference)-12.00iH7/u6 ➢DRNI3Press Fit (Interference)-13.00iH8/u7 ➢DRNI3Press Fit (Interference)-13.00iH7/x6 ➢DRNI3Press Fit (Interference)-16.00Fit Combinations Per ANSI B4.1The tolerance classes mentioned in ANSI B4.1 (e.g., h9, g6, etc.) have the same nomenclature as in ISO 286. It could lead a confusion since the ANSI standard also defines the fundamental deviations and the tolerance grade on its own. The ANSI tolerancing system is nearly the same as the ISO 286 but not identical. If you take the values from the standard ISO charts or use our Online Calculator, you should expect about 0.1-0.5 thous errors. wdt_IDFit NameTolerance Class CombinationFit Typeth1RC 1H5/g4Running or Slidining Fits52RC 2H6/g5Running or Slidining Fits63RC 3H7/f6Running or Slidining Fits74RC 4H8/f7Running or Slidining Fits85RC 5H8/e7Running or Slidining Fits86RC 6H9/e8Running or Slidining Fits97RC 7H9/d8Running or Slidining Fits98RC 8H10/c9Running or Slidining Fits109RC 9H11/sh1Running or Slidining Fits1110LC 1H6/h5Clearance Location Fits611LC 2H7/h6Clearance Location Fits712LC 3H8/h7Clearance Location Fits813LC 4H10/h9Clearance Location Fits1014LC 5H7/g6Clearance Location Fits715LC 6H9/f8Clearance Location Fits916LC 7H10/e9Clearance Location Fits1017LC 8H10/d9Clearance Location Fits1018LC 9H11/c10Clearance Location Fits1119LC 10H12/sh2Clearance Location Fits1220LC 11H13/sh3Clearance Location Fits1321LT 1H7/js6Transition Fits722LT 2H8/js7Transition Fits823LT 3H7/k6Transition Fits724LT 4H8/k7Transition Fits825LT 5H7/n6Transition Fits726LT 6H7/n7Transition Fits727LN 1H6/n5Interference Location Fits628LN 2H7/p6Interference Location Fits729LN 3H7/r6Interference Location Fits730FN 1H6/sh4Force or Shrink Fits631FN 2H7/s6Force or Shrink Fits732FN 3H7/t6Force or Shrink Fits733FN 4H7/u6Force or Shrink Fits734FN 5H8/x7Force or Shrink Fits8Fit Combinations Per ANSI B4.2The tolerance classes mentioned in ANSI B4.1 (e.g., h9, g6, etc.) have the same nomenclature as in ISO 286. It could lead a confusion since the ANSI standard also defines the fundamental deviations and the tolerance grade on its own. The ANSI tolerancing system is nearly the same as the ISO 286 but not identical. If you take the values from the standard ISO charts or use our Online Calculator, you should expect about 0.1-0.5 thous errors.ClassificationHole BasisShaft BasisDescriptionClearanceH11/c11C11/h11Loose running fit for wide commercial tolerances or allowances on external members.H9/d9D9/h9Free running fit not for use where accuracy is essential, but good for large temperature variations, high running speeds, or heavy journal pressures.H8/f7F8/h7Close running fit for running on accurate machines and for accurate location at moderate speeds and journal pressures.H7/g6G7/h6Sliding fit not intended to run freely, but to move and turn freely and locate accurately.H7/h6H7/h6Locational clearance fit provides snug fit for locating stationary parts; but can be freely assembled and disassembled.InterferenceH7/k6K7/h6Locational transition fit for accurate location, a compromise between clearance and interference.H7/n6N7/h6Locational transition fit for more accurate location where greater interference is permissible.TransitionH7/p6P7/h6Locational interference fit for parts requiring rigidity and alignment with prime accuracy of location but without special bore pressure requirements.H7/s6S7/h6Medium drive fit for ordinary steel parts or shrink fits on light sections, the tightest fit usable with cast iron.H7/u6U7/h6Force fit suitable for parts which can be highly stressed or for shrink fits where the heavy pressing forces required are impractical.Related Glossary Terms:Thou

When the percent of chromium in the steel exceeds 1.1% a surface layer is formed that helps protect the steel against oxidation.

Molybdenum has effects similar to manganese and vanadium, and is often used in combination with one or the other. This element is a strong carbide former and is usually present in alloy steels in amounts less than 1%. It increases hardenability and elevated temperature strength and also improves corrosion resistance as well as increased creep strength. It is added to stainless steels to increase their resistance to corrosion and is also used in high speed tool steels.

Chemically very similar to Niobium (Nb), as such, has similar effect on the alloy – forms very hard, very small, simple carbides. Improves ductility, hardness, wear and corrosion resistance. Also, refines grain.

Increases hardness, also allows for higher quenching temperatures (during the heat treatment procedure). Intensifies the individual effects of other elements in more complex steels. Co is not a carbide former, however adding Cobalt to the alloy allows for higher attainable hardness and higher red hot hardness.

An interference (Press) fit is a type in which the shaft is larger than the hole (before assembly). It creates a frictional force that holds the parts together without the need for additional fasteners or adhesives. The interference fit is commonly used in mechanical engineering to create solid and reliable connections between components that need to withstand heavy loads or vibrations. However, It is hard to disassemble without damaging the parts. Some degree of force can be transmitted between the components.Fits are also divided into two types of “basis”There are no technical differences between the two basis. Therefore the choice of the system should be based on economic reasons.Hole Basis FitsThe hole deviation is zero (meaning an H), and the shaft deviation varies to create different fit levels. For example, H9/d8 , H7/g6. It is the first choice of combinations for general use, since it avoids an unnecessary multiplicity of tools (e.g., reamers) and gaugesShaft Basis FitsThe shaft deviation is zero (meaning an h), and the hole deviation varies to create different fit levels. For example, D9/h9, G7/h6. This method should only be utilized when it offers clear economic benefits, such as in situations where it is required to assemble multiple parts with holes that have varying deviations onto a single shaft.Fits Standard Combinations ChartsFor ordinary engineering purposes, only a small number of the many (~150,000) possible fit combinations is required. ISO 286-1:2010 lists about 80 fit combinations that meet most of the needs of any engineering task. You can choose from this list or define a custom combination in our Fit Calculator.(*) In North America, additional fit combinations are sometimes used per ANSI B4.1 & B4.2. You can find below the ISO charts also the ANSI Charts.Click the Fit Link (e.g. G7/h6 ➢) to get its detailed tolerances in both Inch and millimetersHole Basis Fits (ISO 286-1)fit_typeFitFit LevelPreferedc_idfit_sortFit typeLeveliH10/b9 ➢DGNC1Clearance Fit6.00iH11/b11 ➢DGYC1Clearance Fit6.00iH10/c9 ➢DGNC1Clearance Fit5.00iH11/c11 ➢DGYC1Clearance Fit5.00iH8/d8 ➢GRNC1Clearance Fit4.00iH9/d8 ➢GRNC1Clearance Fit4.00iH10/d9 ➢GRYC1Clearance Fit4.00iH11/d10 ➢GRNC1Clearance Fit4.00iH10/e9 ➢GRNC1Clearance Fit3.00iH9/e8 ➢GRYC1Clearance Fit3.00iH8/e8 ➢GRYC1Clearance Fit3.00iH8/e7 ➢GRNC1Clearance Fit3.00iH7/f6 ➢LGNC1Clearance Fit2.00iH9/f8 ➢LGNC1Clearance Fit2.00iH8/f8 ➢LGNC1Clearance Fit2.00iH8/f7 ➢LGYC1Clearance Fit2.00iH7/g6 ➢LGYC1Clearance Fit1.00iH6/g5 ➢LGNC1Clearance Fit1.00iH10/h9 ➢LGYC1Clearance Fit0.00iH11/h10 ➢LGNC1Clearance Fit0.00iH9/h8 ➢LGNC1Clearance Fit0.00iH8/h8 ➢LGNC1Clearance Fit0.00iH6/h5 ➢LGNC1Clearance Fit0.00iH7/h6 ➢LGYC1Clearance Fit0.00iH8/h7 ➢LGYC1Clearance Fit-1.00iH6/js5 ➢orNT2Transition Fit-1.00iH7/js6 ➢orYT2Transition Fit-1.00iH8/k7 ➢orNT2Transition Fit-3.00iH6/k5 ➢orNT2Transition Fit-3.00iH7/k6 ➢orYT2Transition Fit-3.00iH7/m6 ➢orNT2Transition Fit-5.00iH6/m5 ➢orNT2Transition Fit-5.00iH8/m7 ➢orNT2Transition Fit-5.00iH7/n6 ➢orYT2Transition Fit-6.00iH8/js7 ➢orNT2Transition Fit-11.00iH6/n5 ➢LRNI3Press Fit (Interference)-6.00iH7/p6 ➢LRYI3Press Fit (Interference)-8.00iH6/p5 ➢LRNI3Press Fit (Interference)-8.00iH7/r6 ➢LRYI3Press Fit (Interference)-10.00iH7/s6 ➢RDYI3Press Fit (Interference)-11.00iH8/s7 ➢RDNI3Press Fit (Interference)-11.00iH7/t6 ➢RDNI3Press Fit (Interference)-12.00iH7/u6 ➢DRNI3Press Fit (Interference)-13.00iH8/u7 ➢DRNI3Press Fit (Interference)-13.00iH7/x6 ➢DRNI3Press Fit (Interference)-16.00Shaft Basis Fits (ISO 286-1)fit_typeFitFit LevelPreferedc_idfit_sortFit typeLeveliH10/b9 ➢DGNC1Clearance Fit6.00iH11/b11 ➢DGYC1Clearance Fit6.00iH10/c9 ➢DGNC1Clearance Fit5.00iH11/c11 ➢DGYC1Clearance Fit5.00iH8/d8 ➢GRNC1Clearance Fit4.00iH9/d8 ➢GRNC1Clearance Fit4.00iH10/d9 ➢GRYC1Clearance Fit4.00iH11/d10 ➢GRNC1Clearance Fit4.00iH10/e9 ➢GRNC1Clearance Fit3.00iH9/e8 ➢GRYC1Clearance Fit3.00iH8/e8 ➢GRYC1Clearance Fit3.00iH8/e7 ➢GRNC1Clearance Fit3.00iH7/f6 ➢LGNC1Clearance Fit2.00iH9/f8 ➢LGNC1Clearance Fit2.00iH8/f8 ➢LGNC1Clearance Fit2.00iH8/f7 ➢LGYC1Clearance Fit2.00iH7/g6 ➢LGYC1Clearance Fit1.00iH6/g5 ➢LGNC1Clearance Fit1.00iH10/h9 ➢LGYC1Clearance Fit0.00iH11/h10 ➢LGNC1Clearance Fit0.00iH9/h8 ➢LGNC1Clearance Fit0.00iH8/h8 ➢LGNC1Clearance Fit0.00iH6/h5 ➢LGNC1Clearance Fit0.00iH7/h6 ➢LGYC1Clearance Fit0.00iH8/h7 ➢LGYC1Clearance Fit-1.00iH6/js5 ➢orNT2Transition Fit-1.00iH7/js6 ➢orYT2Transition Fit-1.00iH8/k7 ➢orNT2Transition Fit-3.00iH6/k5 ➢orNT2Transition Fit-3.00iH7/k6 ➢orYT2Transition Fit-3.00iH7/m6 ➢orNT2Transition Fit-5.00iH6/m5 ➢orNT2Transition Fit-5.00iH8/m7 ➢orNT2Transition Fit-5.00iH7/n6 ➢orYT2Transition Fit-6.00iH8/js7 ➢orNT2Transition Fit-11.00iH6/n5 ➢LRNI3Press Fit (Interference)-6.00iH7/p6 ➢LRYI3Press Fit (Interference)-8.00iH6/p5 ➢LRNI3Press Fit (Interference)-8.00iH7/r6 ➢LRYI3Press Fit (Interference)-10.00iH7/s6 ➢RDYI3Press Fit (Interference)-11.00iH8/s7 ➢RDNI3Press Fit (Interference)-11.00iH7/t6 ➢RDNI3Press Fit (Interference)-12.00iH7/u6 ➢DRNI3Press Fit (Interference)-13.00iH8/u7 ➢DRNI3Press Fit (Interference)-13.00iH7/x6 ➢DRNI3Press Fit (Interference)-16.00Fit Combinations Per ANSI B4.1The tolerance classes mentioned in ANSI B4.1 (e.g., h9, g6, etc.) have the same nomenclature as in ISO 286. It could lead a confusion since the ANSI standard also defines the fundamental deviations and the tolerance grade on its own. The ANSI tolerancing system is nearly the same as the ISO 286 but not identical. If you take the values from the standard ISO charts or use our Online Calculator, you should expect about 0.1-0.5 thous errors. wdt_IDFit NameTolerance Class CombinationFit Typeth1RC 1H5/g4Running or Slidining Fits52RC 2H6/g5Running or Slidining Fits63RC 3H7/f6Running or Slidining Fits74RC 4H8/f7Running or Slidining Fits85RC 5H8/e7Running or Slidining Fits86RC 6H9/e8Running or Slidining Fits97RC 7H9/d8Running or Slidining Fits98RC 8H10/c9Running or Slidining Fits109RC 9H11/sh1Running or Slidining Fits1110LC 1H6/h5Clearance Location Fits611LC 2H7/h6Clearance Location Fits712LC 3H8/h7Clearance Location Fits813LC 4H10/h9Clearance Location Fits1014LC 5H7/g6Clearance Location Fits715LC 6H9/f8Clearance Location Fits916LC 7H10/e9Clearance Location Fits1017LC 8H10/d9Clearance Location Fits1018LC 9H11/c10Clearance Location Fits1119LC 10H12/sh2Clearance Location Fits1220LC 11H13/sh3Clearance Location Fits1321LT 1H7/js6Transition Fits722LT 2H8/js7Transition Fits823LT 3H7/k6Transition Fits724LT 4H8/k7Transition Fits825LT 5H7/n6Transition Fits726LT 6H7/n7Transition Fits727LN 1H6/n5Interference Location Fits628LN 2H7/p6Interference Location Fits729LN 3H7/r6Interference Location Fits730FN 1H6/sh4Force or Shrink Fits631FN 2H7/s6Force or Shrink Fits732FN 3H7/t6Force or Shrink Fits733FN 4H7/u6Force or Shrink Fits734FN 5H8/x7Force or Shrink Fits8Fit Combinations Per ANSI B4.2The tolerance classes mentioned in ANSI B4.1 (e.g., h9, g6, etc.) have the same nomenclature as in ISO 286. It could lead a confusion since the ANSI standard also defines the fundamental deviations and the tolerance grade on its own. The ANSI tolerancing system is nearly the same as the ISO 286 but not identical. If you take the values from the standard ISO charts or use our Online Calculator, you should expect about 0.1-0.5 thous errors.ClassificationHole BasisShaft BasisDescriptionClearanceH11/c11C11/h11Loose running fit for wide commercial tolerances or allowances on external members.H9/d9D9/h9Free running fit not for use where accuracy is essential, but good for large temperature variations, high running speeds, or heavy journal pressures.H8/f7F8/h7Close running fit for running on accurate machines and for accurate location at moderate speeds and journal pressures.H7/g6G7/h6Sliding fit not intended to run freely, but to move and turn freely and locate accurately.H7/h6H7/h6Locational clearance fit provides snug fit for locating stationary parts; but can be freely assembled and disassembled.InterferenceH7/k6K7/h6Locational transition fit for accurate location, a compromise between clearance and interference.H7/n6N7/h6Locational transition fit for more accurate location where greater interference is permissible.TransitionH7/p6P7/h6Locational interference fit for parts requiring rigidity and alignment with prime accuracy of location but without special bore pressure requirements.H7/s6S7/h6Medium drive fit for ordinary steel parts or shrink fits on light sections, the tightest fit usable with cast iron.H7/u6U7/h6Force fit suitable for parts which can be highly stressed or for shrink fits where the heavy pressing forces required are impractical.Related Glossary Terms:Thou

The tolerance class is designated by the letter(s) representing the fundamental deviation followed by the standard tolerance grade number. For example, a shaft with a deviation of g and a tolerance grade of T11 will be denoted as g11. A hole with a deviation of JS and a tolerance grade of IT7 will be represented as JS7.Tolerance SizeThe tolerance size combines the basic size with the tolerance class, designated by the basic size, followedby the designation of the required tolerance class (without spaces). For example, 32H7 specifies a hole with a nominal size of 32 mm, deviation H, and tolerance grade of IT7.Tolerances ChartsStandard Tolerance Grades (IT) ChartTolerance Dimensions in MicronsTo convert to millimeters, divide by 1000To convert to Thous, divide by 25.4 wdt_IDDiameter Range (mm)(Inches)IT01IT0IT1IT2IT3IT4IT5IT6IT7IT8IT9IT10IT11IT12IT13IT14IT15IT16IT17IT1810 - 30 - 0.120.30.50.81.2234610142540601001402504006001000140023 - 60.12 - 0.240.40.611.52.545812183048751201803004807501200180036 - 100.24 - 0.40.40.611.52.5469152236589015022036058090015002200410 - 180.4 - 0.710.50.81.223581118274370110180270430700110018002700518 - 300.71 - 1.190.611.52.54691321335284130210330520840130021003300630 - 501.19 - 1.970.611.52.54711162539621001602503906201000160025003900750 - 801.97 - 3.150.81.2235813193046741201903004607401200190030004600880 - 1203.15 - 4.7311.52.54610152235548714022035054087014002200350054009120 - 1804.73 - 7.091.223.55812182540631001602504006301000160025004000630010180 - 2507.09 - 9.85234.571014202946721151852904607201150185029004600720011250 - 3159.85 - 12.412.54681216233252811302103205208101300210032005200810012315 - 40012.41 - 15.7535791318253657891402303605708901400230036005700890013400 - 50015.75 - 19.7468101520274063971552504006309701550250040006300970014500 - 63019.7 - 24.84.569111622324470110175280440700110017502800440070001100015630 - 80024.8 - 31.55710131825365080125200320500800125020003200500080001250016800 - 100031.5 - 39.45.58111521284056901402303605609001400230036005600900014000171000 - 125039.4 - 49.26.59131824334766105165260420660105016502600420066001050016500181250 - 160049.2 - 63811152129395578125195310500780125019503100500078001250019500191600 - 200063 - 78.7913182535466592150230370600920150023003700600092001500023000202000 - 250078.7 - 98.4111522304155781101752804407001100175028004400700011001750028000212500 - 315098.4 - 1241318263650689613521033054086013502100330054008600135002100033000Fundamental deviation of holes ChartClick the Tolerance Link (e.g., H ➢) to get the Full & Accurate charts for a specific deviation in Inch and Metric unitsClick  icons to show all columns for the entire diameter range (0-3,150 mm)The deviations of J through Z also depend on the IT Therefore, the values in the below table are only accurate in some cases. To get the correct value in all cases, click the Tolerance Link (e.g., H ➢).Dimentions in Microns. To convert to millimeters, divide by 1000, to Thous, divide by 25.4 Deviationidurl0 - 3 mm3 - 6 mm6 - 1010 - 1414 - 1818 - 2424 - 3030 - 4040 - 5050 - 6565 - 8080 - 100100 - 120120 - 140140 - 160160 - 180180 - 200200 - 225225 - 250250 - 280280 - 315315 - 355355 - 400400 - 450450 - 500500 - 560560 - 630630 - 710710 - 800800 - 900900 - 10001000 - 11201120 - 12501250 - 14001400 - 16001600 - 18001800 - 20002000 - 22402240 - 25002500 - 28002800 - 3150A ➢1calculators/tolerances/tol?dev=a||A ➢27027028029029030030031032034036038041046052058066074082092010501200135015001650XXXXXXXXXXXXXXXXB ➢2calculators/tolerances/tol?dev=b||B ➢140140150150150160160170180190200220240260280310340380420480540600680760840XXXXXXXXXXXXXXXXC ➢3calculators/tolerances/tol?dev=c||C ➢6070809595110110120130140150170180200210230240260280300330360400440480520580640700780860940105011501300145016001800200022002500CD ➢4calculators/tolerances/tol?dev=cd||CD ➢344656XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXD ➢5calculators/tolerances/tol?dev=d||D ➢203040505065658080100100120120145145145170170170190190210210230230260260290290320320350350390390430430480480520520E ➢6calculators/tolerances/tol?dev=e||E ➢14202532324040505060607272858585100100100110110125125135135145145160160170170195195220220240240260260290290EF ➢7calculators/tolerances/tol?dev=ef||EF ➢101418XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXF ➢8calculators/tolerances/tol?dev=f||F ➢61013161620202525303036364343435050505656626268687676808086869898110110120120130130145145FG ➢9calculators/tolerances/tol?dev=fg||FG ➢468XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXG ➢10calculators/tolerances/tol?dev=g||G ➢2456677991010121214141415151517171818202022222424262628283030323234343838H ➢11calculators/tolerances/tol?dev=h||H ➢00000000000000000000000000000000000000000JS ➢12calculators/tolerances/tol?dev=js||JS ➢00000000000000000000000000000000000000000J ➢13calculators/tolerances/tol?dev=j||J ➢46810101212141418182222262626303030363639394343XXXXXXXXXXXXXXXXK ➢14calculators/tolerances/tol?dev=k||K ➢0-1-1-1-1-2-2-2-2-2-2-3-3-3-3-3-4-4-4-4-4-4-4-5-50000000000000000M ➢15calculators/tolerances/tol?dev=m||M ➢-2-4-6-7-7-8-8-9-9-11-11-13-13-15-15-15-17-17-17-20-20-21-21-23-23-26-26-30-30-34-34-40-40-48-48-58-58-68-68-76-76N ➢16calculators/tolerances/tol?dev=n||N ➢-4-8-10-12-12-15-15-17-17-20-20-23-23-27-27-27-31-31-31-34-34-37-37-40-40-44-44-50-50-56-56-66-66-78-78-92-92-110-110-135-135P ➢17calculators/tolerances/tol?dev=p||P ➢-6-12-15-18-18-22-22-26-26-32-32-37-37-43-43-43-50-50-50-56-56-62-62-68-68-78-78-88-88-100-100-120-120-140-140-170-170-195-195-240-240R ➢18calculators/tolerances/tol?dev=r||R ➢-10-15-19-23-23-28-28-34-34-41-43-51-54-63-65-68-77-80-84-94-98-108-114-126-132-150-155-175-185-210-220-250-260-300-330-370-400-440-460-550-580S ➢19calculators/tolerances/tol?dev=s||S ➢-14-19-23-28-28-35-35-43-43-53-59-71-79-92-100-108-122-130-140-158-170-190-208-232-252-280-310-340-380-430-470-520-580-640-720-820-920-1000-1100-1250-1400T ➢20calculators/tolerances/tol?dev=t||T ➢000XXX-41-48-54-66-75-91-104-122-134-146-166-180-196-218-240-268-294-330-360-400-450-500-560-620-680-780-840-960-1050-1200-1350-1500-1650-1900-2100U ➢21calculators/tolerances/tol?dev=u||U ➢-18-23-28-33-33-41-48-60-70-87-102-124-144-170-190-210-236-258-284-315-350-390-435-490-540-600-660-740-840-940-1050-1150-1300-1450-1600-1850-2000-2300-2500-2900-3200V ➢22calculators/tolerances/tol?dev=v||V ➢000X-39-47-55-68-81-102-120-146-172-202-228-252-284-310-340-385-425-475-530-595-660-740-820-920-1000-1150-1300-1450-1600-1800-2000-2300-2500-2800-3100-3500-3900X ➢23calculators/tolerances/tol?dev=x||X ➢-20-28-34-40-45-54-64-80-97-122-146-178-210-248-280-310-340-385-425-475-525-590-660-740-820XXXXXXXXXXXXXXXXY ➢24calculators/tolerances/tol?dev=y||Y ➢000XX-63-75-94-114-144-174-214-254-300-340-380-425-470-520-580-650-730-820-920-1000XXXXXXXXXXXXXXXXZ ➢25calculators/tolerances/tol?dev=z||Z ➢-26-35-42-50-60-73-88-112-136-172-210-258-310-365-415-465-520-575-640-710-790-900-1000-1100-1250XXXXXXXXXXXXXXXXZA ➢26calculators/tolerances/tol?dev=za||ZA ➢-32-42-52-64-77-98-118-148-180-226-274-335-400-470-535-600-670-740-820-920-1000-1150-1300-1450-1600XXXXXXXXXXXXXXXXFundamental deviation of shafts ChartClick the Tolerance Link (e.g., g ➢) to get the Full & Accurate charts for a specific deviation in Inch and Metric unitsClick  icons to show all columns of the entire diameter range (0-3,150 mm)The deviations of J through Z also depend on the IT Therefore, the values in the below table are only accurate in some cases. To get the correct value in all cases, click the Tolerance Link (e.g., g ➢).Dimentions in Microns. To convert to millimeters, divide by 1000, to Thous, divide by 25.4 Deviationidurl0 - 3 mm3 - 6 mm6 - 1010 - 1414 - 1818 - 2424 - 3030 - 4040 - 5050 - 6565 - 8080 - 100100 - 120120 - 140140 - 160160 - 180180 - 200200 - 225225 - 250250 - 280280 - 315315 - 355355 - 400400 - 450450 - 500500 - 560560 - 630630 - 710710 - 800800 - 900900 - 10001000 - 11201120 - 12501250 - 14001400 - 16001600 - 18001800 - 20002000 - 22402240 - 25002500 - 28002800 - 3150a ➢1calculators/tolerances/tol?dev=a||A ➢-270-270-280-290-290-300-300-310-320-340-360-380-410-460-520-580-660-740-820-920-1050-1200-1350-1500-1650XXXXXXXXXXXXXXXXb ➢2calculators/tolerances/tol?dev=b||B ➢-140-140-150-150-150-160-160-170-180-190-200-220-240-260-280-310-340-380-420-480-540-600-680-760-840XXXXXXXXXXXXXXXXc ➢3calculators/tolerances/tol?dev=c||C ➢-60-70-80-95-95-110-110-120-130-140-150-170-180-200-210-230-240-260-280-300-330-360-400-440-480-520-580-640-700-780-860-940-1050-1150-1300-1450-1600-1800-2000-2200-2500cd ➢4calculators/tolerances/tol?dev=cd||CD ➢-34-46-56XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXd ➢5calculators/tolerances/tol?dev=d||D ➢-20-30-40-50-50-65-65-80-80-100-100-120-120-145-145-145-170-170-170-190-190-210-210-230-230-260-260-290-290-320-320-350-350-390-390-430-430-480-480-520-520e ➢6calculators/tolerances/tol?dev=e||E ➢-14-20-25-32-32-40-40-50-50-60-60-72-72-85-85-85-100-100-100-110-110-125-125-135-135-145-145-160-160-170-170-195-195-220-220-240-240-260-260-290-290ef ➢7calculators/tolerances/tol?dev=ef||EF ➢-10-14-18XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXf ➢8calculators/tolerances/tol?dev=f||F ➢-6-10-13-16-16-20-20-25-25-30-30-36-36-43-43-43-50-50-50-56-56-62-62-68-68-76-76-80-80-86-86-98-98-110-110-120-120-130-130-145-145fg ➢9calculators/tolerances/tol?dev=fg||FG ➢-4-6-8XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXg ➢10calculators/tolerances/tol?dev=g||G ➢-2-4-5-6-6-7-7-9-9-10-10-12-12-14-14-14-15-15-15-17-17-18-18-20-20-22-22-24-24-26-26-28-28-30-30-32-32-34-34-38-38h ➢11calculators/tolerances/tol?dev=h||H ➢00000000000000000000000000000000000000000js ➢12calculators/tolerances/tol?dev=js||JS ➢00000000000000000000000000000000000000000j ➢13calculators/tolerances/tol?dev=j||J ➢-4-6-8-10-10-12-12-14-14-18-18-22-22-26-26-26-30-30-30-36-36-39-39-43-43XXXXXXXXXXXXXXXXk ➢14calculators/tolerances/tol?dev=k||K ➢01111222222333334444444550000000000000000m ➢15calculators/tolerances/tol?dev=m||M ➢2467788991111131315151517171720202121232326263030343440404848585868687676n ➢16calculators/tolerances/tol?dev=n||N ➢481012121515171720202323272727313131343437374040444450505656666678789292110110135135p ➢17calculators/tolerances/tol?dev=p||P ➢612151818222226263232373743434350505056566262686878788888100100120120140140170170195195240240r ➢18calculators/tolerances/tol?dev=r||R ➢101519232328283434414351546365687780849498108114126132150155175185210220250260300330370400440460550580s ➢19calculators/tolerances/tol?dev=s||S ➢14192328283535434353597179921001081221301401581701902082322522803103403804304705205806407208209201000110012501400t ➢20calculators/tolerances/tol?dev=t||T ➢000XXX4148546675911041221341461661801962182402682943303604004505005606206807808409601050120013501500165019002100u ➢21calculators/tolerances/tol?dev=u||U ➢1823283333414860708710212414417019021023625828431535039043549054060066074084094010501150130014501600185020002300250029003200v ➢22calculators/tolerances/tol?dev=v||V ➢000X39475568811021201461722022282522843103403854254755305956607408209201000115013001450160018002000230025002800310035003900x ➢23calculators/tolerances/tol?dev=x||X ➢202834404554648097122146178210248280310340385425475525590660740820XXXXXXXXXXXXXXXXy ➢24calculators/tolerances/tol?dev=y||Y ➢000XX6375941141441742142543003403804254705205806507308209201000XXXXXXXXXXXXXXXXz ➢25calculators/tolerances/tol?dev=z||Z ➢26354250607388112136172210258310365415465520575640710790900100011001250XXXXXXXXXXXXXXXXza ➢26calculators/tolerances/tol?dev=za||ZA ➢32425264779811814818022627433540047053560067074082092010001150130014501600XXXXXXXXXXXXXXXXEngineering FitsEngineering fit refers to the degree of tightness or looseness between two mating parts in an assembly. It is defined by combining a hole with a tolerance class and a shaft with a tolerance class. (See definition of terms above).Several standards define recommended pairings for different applications. The values presented in our charts and Calculator are based on ISO 286-1:2010 (In earlier revisions, it was separated into ISO 1829, which is now obsolete). In North America, additional fit combinations are sometimes used per ANSI B4.1 & B4.2. The ANSI tolerancing system is nearly equivalent to ISO 286 but not identical. The difference is typically 0.1-0.5 thous.Main Fit TypesClearance FitA clearance fit is a type in which the shaft is smaller than the hole it is inserted into, allowing for free movement, assembly, and disassembly. Clearance fits can range from loose-running for assemblies that need a significant gap for free movement or to accommodate temperature variation to locational clearance for stationary parts that need to be freely assembled/disassembled but still maintain accuracy.Transition FitA transition fit is a type in which the shaft may be slightly smaller or larger than the hole (before assembly). It is used to create a tight and secure connection between them in applications requiring high precision and stability. It provides high accuracy, but the connecting parts can be disassembled and reassembled without damage. However, force cannot be transmitted.Press Fit (Interference)An interference (Press) fit is a type in which the shaft is larger than the hole (before assembly). It creates a frictional force that holds the parts together without the need for additional fasteners or adhesives. The interference fit is commonly used in mechanical engineering to create solid and reliable connections between components that need to withstand heavy loads or vibrations. However, It is hard to disassemble without damaging the parts. Some degree of force can be transmitted between the components.Fits are also divided into two types of “basis”There are no technical differences between the two basis. Therefore the choice of the system should be based on economic reasons.Hole Basis FitsThe hole deviation is zero (meaning an H), and the shaft deviation varies to create different fit levels. For example, H9/d8 , H7/g6. It is the first choice of combinations for general use, since it avoids an unnecessary multiplicity of tools (e.g., reamers) and gaugesShaft Basis FitsThe shaft deviation is zero (meaning an h), and the hole deviation varies to create different fit levels. For example, D9/h9, G7/h6. This method should only be utilized when it offers clear economic benefits, such as in situations where it is required to assemble multiple parts with holes that have varying deviations onto a single shaft.Fits Standard Combinations ChartsFor ordinary engineering purposes, only a small number of the many (~150,000) possible fit combinations is required. ISO 286-1:2010 lists about 80 fit combinations that meet most of the needs of any engineering task. You can choose from this list or define a custom combination in our Fit Calculator.(*) In North America, additional fit combinations are sometimes used per ANSI B4.1 & B4.2. You can find below the ISO charts also the ANSI Charts.Click the Fit Link (e.g. G7/h6 ➢) to get its detailed tolerances in both Inch and millimetersHole Basis Fits (ISO 286-1)fit_typeFitFit LevelPreferedc_idfit_sortFit typeLeveliH10/b9 ➢DGNC1Clearance Fit6.00iH11/b11 ➢DGYC1Clearance Fit6.00iH10/c9 ➢DGNC1Clearance Fit5.00iH11/c11 ➢DGYC1Clearance Fit5.00iH8/d8 ➢GRNC1Clearance Fit4.00iH9/d8 ➢GRNC1Clearance Fit4.00iH10/d9 ➢GRYC1Clearance Fit4.00iH11/d10 ➢GRNC1Clearance Fit4.00iH10/e9 ➢GRNC1Clearance Fit3.00iH9/e8 ➢GRYC1Clearance Fit3.00iH8/e8 ➢GRYC1Clearance Fit3.00iH8/e7 ➢GRNC1Clearance Fit3.00iH7/f6 ➢LGNC1Clearance Fit2.00iH9/f8 ➢LGNC1Clearance Fit2.00iH8/f8 ➢LGNC1Clearance Fit2.00iH8/f7 ➢LGYC1Clearance Fit2.00iH7/g6 ➢LGYC1Clearance Fit1.00iH6/g5 ➢LGNC1Clearance Fit1.00iH10/h9 ➢LGYC1Clearance Fit0.00iH11/h10 ➢LGNC1Clearance Fit0.00iH9/h8 ➢LGNC1Clearance Fit0.00iH8/h8 ➢LGNC1Clearance Fit0.00iH6/h5 ➢LGNC1Clearance Fit0.00iH7/h6 ➢LGYC1Clearance Fit0.00iH8/h7 ➢LGYC1Clearance Fit-1.00iH6/js5 ➢orNT2Transition Fit-1.00iH7/js6 ➢orYT2Transition Fit-1.00iH8/k7 ➢orNT2Transition Fit-3.00iH6/k5 ➢orNT2Transition Fit-3.00iH7/k6 ➢orYT2Transition Fit-3.00iH7/m6 ➢orNT2Transition Fit-5.00iH6/m5 ➢orNT2Transition Fit-5.00iH8/m7 ➢orNT2Transition Fit-5.00iH7/n6 ➢orYT2Transition Fit-6.00iH8/js7 ➢orNT2Transition Fit-11.00iH6/n5 ➢LRNI3Press Fit (Interference)-6.00iH7/p6 ➢LRYI3Press Fit (Interference)-8.00iH6/p5 ➢LRNI3Press Fit (Interference)-8.00iH7/r6 ➢LRYI3Press Fit (Interference)-10.00iH7/s6 ➢RDYI3Press Fit (Interference)-11.00iH8/s7 ➢RDNI3Press Fit (Interference)-11.00iH7/t6 ➢RDNI3Press Fit (Interference)-12.00iH7/u6 ➢DRNI3Press Fit (Interference)-13.00iH8/u7 ➢DRNI3Press Fit (Interference)-13.00iH7/x6 ➢DRNI3Press Fit (Interference)-16.00Shaft Basis Fits (ISO 286-1)fit_typeFitFit LevelPreferedc_idfit_sortFit typeLeveliH10/b9 ➢DGNC1Clearance Fit6.00iH11/b11 ➢DGYC1Clearance Fit6.00iH10/c9 ➢DGNC1Clearance Fit5.00iH11/c11 ➢DGYC1Clearance Fit5.00iH8/d8 ➢GRNC1Clearance Fit4.00iH9/d8 ➢GRNC1Clearance Fit4.00iH10/d9 ➢GRYC1Clearance Fit4.00iH11/d10 ➢GRNC1Clearance Fit4.00iH10/e9 ➢GRNC1Clearance Fit3.00iH9/e8 ➢GRYC1Clearance Fit3.00iH8/e8 ➢GRYC1Clearance Fit3.00iH8/e7 ➢GRNC1Clearance Fit3.00iH7/f6 ➢LGNC1Clearance Fit2.00iH9/f8 ➢LGNC1Clearance Fit2.00iH8/f8 ➢LGNC1Clearance Fit2.00iH8/f7 ➢LGYC1Clearance Fit2.00iH7/g6 ➢LGYC1Clearance Fit1.00iH6/g5 ➢LGNC1Clearance Fit1.00iH10/h9 ➢LGYC1Clearance Fit0.00iH11/h10 ➢LGNC1Clearance Fit0.00iH9/h8 ➢LGNC1Clearance Fit0.00iH8/h8 ➢LGNC1Clearance Fit0.00iH6/h5 ➢LGNC1Clearance Fit0.00iH7/h6 ➢LGYC1Clearance Fit0.00iH8/h7 ➢LGYC1Clearance Fit-1.00iH6/js5 ➢orNT2Transition Fit-1.00iH7/js6 ➢orYT2Transition Fit-1.00iH8/k7 ➢orNT2Transition Fit-3.00iH6/k5 ➢orNT2Transition Fit-3.00iH7/k6 ➢orYT2Transition Fit-3.00iH7/m6 ➢orNT2Transition Fit-5.00iH6/m5 ➢orNT2Transition Fit-5.00iH8/m7 ➢orNT2Transition Fit-5.00iH7/n6 ➢orYT2Transition Fit-6.00iH8/js7 ➢orNT2Transition Fit-11.00iH6/n5 ➢LRNI3Press Fit (Interference)-6.00iH7/p6 ➢LRYI3Press Fit (Interference)-8.00iH6/p5 ➢LRNI3Press Fit (Interference)-8.00iH7/r6 ➢LRYI3Press Fit (Interference)-10.00iH7/s6 ➢RDYI3Press Fit (Interference)-11.00iH8/s7 ➢RDNI3Press Fit (Interference)-11.00iH7/t6 ➢RDNI3Press Fit (Interference)-12.00iH7/u6 ➢DRNI3Press Fit (Interference)-13.00iH8/u7 ➢DRNI3Press Fit (Interference)-13.00iH7/x6 ➢DRNI3Press Fit (Interference)-16.00Fit Combinations Per ANSI B4.1The tolerance classes mentioned in ANSI B4.1 (e.g., h9, g6, etc.) have the same nomenclature as in ISO 286. It could lead a confusion since the ANSI standard also defines the fundamental deviations and the tolerance grade on its own. The ANSI tolerancing system is nearly the same as the ISO 286 but not identical. If you take the values from the standard ISO charts or use our Online Calculator, you should expect about 0.1-0.5 thous errors. wdt_IDFit NameTolerance Class CombinationFit Typeth1RC 1H5/g4Running or Slidining Fits52RC 2H6/g5Running or Slidining Fits63RC 3H7/f6Running or Slidining Fits74RC 4H8/f7Running or Slidining Fits85RC 5H8/e7Running or Slidining Fits86RC 6H9/e8Running or Slidining Fits97RC 7H9/d8Running or Slidining Fits98RC 8H10/c9Running or Slidining Fits109RC 9H11/sh1Running or Slidining Fits1110LC 1H6/h5Clearance Location Fits611LC 2H7/h6Clearance Location Fits712LC 3H8/h7Clearance Location Fits813LC 4H10/h9Clearance Location Fits1014LC 5H7/g6Clearance Location Fits715LC 6H9/f8Clearance Location Fits916LC 7H10/e9Clearance Location Fits1017LC 8H10/d9Clearance Location Fits1018LC 9H11/c10Clearance Location Fits1119LC 10H12/sh2Clearance Location Fits1220LC 11H13/sh3Clearance Location Fits1321LT 1H7/js6Transition Fits722LT 2H8/js7Transition Fits823LT 3H7/k6Transition Fits724LT 4H8/k7Transition Fits825LT 5H7/n6Transition Fits726LT 6H7/n7Transition Fits727LN 1H6/n5Interference Location Fits628LN 2H7/p6Interference Location Fits729LN 3H7/r6Interference Location Fits730FN 1H6/sh4Force or Shrink Fits631FN 2H7/s6Force or Shrink Fits732FN 3H7/t6Force or Shrink Fits733FN 4H7/u6Force or Shrink Fits734FN 5H8/x7Force or Shrink Fits8Fit Combinations Per ANSI B4.2The tolerance classes mentioned in ANSI B4.1 (e.g., h9, g6, etc.) have the same nomenclature as in ISO 286. It could lead a confusion since the ANSI standard also defines the fundamental deviations and the tolerance grade on its own. The ANSI tolerancing system is nearly the same as the ISO 286 but not identical. If you take the values from the standard ISO charts or use our Online Calculator, you should expect about 0.1-0.5 thous errors.ClassificationHole BasisShaft BasisDescriptionClearanceH11/c11C11/h11Loose running fit for wide commercial tolerances or allowances on external members.H9/d9D9/h9Free running fit not for use where accuracy is essential, but good for large temperature variations, high running speeds, or heavy journal pressures.H8/f7F8/h7Close running fit for running on accurate machines and for accurate location at moderate speeds and journal pressures.H7/g6G7/h6Sliding fit not intended to run freely, but to move and turn freely and locate accurately.H7/h6H7/h6Locational clearance fit provides snug fit for locating stationary parts; but can be freely assembled and disassembled.InterferenceH7/k6K7/h6Locational transition fit for accurate location, a compromise between clearance and interference.H7/n6N7/h6Locational transition fit for more accurate location where greater interference is permissible.TransitionH7/p6P7/h6Locational interference fit for parts requiring rigidity and alignment with prime accuracy of location but without special bore pressure requirements.H7/s6S7/h6Medium drive fit for ordinary steel parts or shrink fits on light sections, the tightest fit usable with cast iron.H7/u6U7/h6Force fit suitable for parts which can be highly stressed or for shrink fits where the heavy pressing forces required are impractical.Related Glossary Terms:Thou

Nominal size is the dimension by which a feature is identified for convenience. It is also the point from which the limits are derived by application of the necessary deviation and tolerance (See explanation below). For example, a slot whose actual width is 25.15 mm would be known as a 25-mm wide slot.Limits of SizeLimits are the basic size’s high (Upper limit) and low (Lower limit) values. For example, if the lower limit of a hole is 25.05 mm and the upper limit of the same hole is 25.15 mm, then a hole that is 25.1 mm in diameter is within limits and is acceptable. The limits are the final result obtained from the tolerance system based on the nominal size and tolerance class.ShaftShaft refers to an external feature of a workpiece, typically cylindrical in shape. However, the term can be used to describe any external feature. For example, a block that has to fit into a keyway or the square shank of a cutting tool can also be referred to as a shaft.HoleHole refers to an internal feature of a workpiece, typically a bore. However, the term can be used to describe any internal feature. For example, a keyway.Fundamental DeviationFundamental Deviation is The position of the tolerance zone in relation to the zero line (Also referred to as basic size or nominal size). The fundamental deviation is measured to the point that is nearest to the zero line. A 1-2 character letter code (e.g. G, js, are used to indicate it. Holes are marked by capital letters, and shafts by small letters. For example, “G” is a fundamental deviation of a hole, and “js” is a fundamental deviation of a shaft.The size of the deviation depends on its letter code and the nominal size.Values are listed in the below table.Check out our below infographic for easier understanding.Upper & lower DeviationsThe algebraic difference between the upper limit and the basic size is called the upper deviation and is denoted by es for shafts and ES for holes. The algebraic difference between the lower limit and the basic size is called the lower deviation and is represented by ei for shafts and EI for holes. The configurations may be confusing and depend if the feature is external or internal and if the deviation is negative, positive, or zero.Deviation SymbolA-GHes=0,ei=ITEI=0, ES=ITJSei=es=IT/2EI=ES=IT/2K-ZToleranceTolerance is the difference between the limits of size. That is the upper limit minus the lower limit.Standard Tolerance Grade: A number between 0 to 18 and designated as “IT” (e.g. IT7). A lower IT means higher accuracy. The value of each IT also depends on the basic size. You can find the values in the below chart.The IS0 system provides 20 standard tolerance grades, of which IT1 to IT18 are considered general use. In addition, there are two complementary grades, IT01 and IT0. The collection of charts provided in ISO 286-2 covers only IT1-IT18.Tolerance Class: The term used for the combination of a fundamental deviation with a standard tolerance grade, e.g. h9, D13, etc.All the above terms are summarized in the below infographics(*) Click to enlargeNomenclatureStandard Tolerance GradesThe standard tolerance grades are designated by the letters IT followed by a number, for example, IT7. When the tolerance grade is associated with a fundamental deviation symbol to form a tolerance class, the letters IT are omitted (e.g., h7, JS5)Fundamental DeviationA 1-2 letter code represents the fundamental deviation. Upper case (e.g., G, JS) designates hole deviations, while lower case (e.g., g, js) designates shaft deviations.Tolerance ClassThe tolerance class is designated by the letter(s) representing the fundamental deviation followed by the standard tolerance grade number. For example, a shaft with a deviation of g and a tolerance grade of T11 will be denoted as g11. A hole with a deviation of JS and a tolerance grade of IT7 will be represented as JS7.Tolerance SizeThe tolerance size combines the basic size with the tolerance class, designated by the basic size, followedby the designation of the required tolerance class (without spaces). For example, 32H7 specifies a hole with a nominal size of 32 mm, deviation H, and tolerance grade of IT7.Tolerances ChartsStandard Tolerance Grades (IT) ChartTolerance Dimensions in MicronsTo convert to millimeters, divide by 1000To convert to Thous, divide by 25.4 wdt_IDDiameter Range (mm)(Inches)IT01IT0IT1IT2IT3IT4IT5IT6IT7IT8IT9IT10IT11IT12IT13IT14IT15IT16IT17IT1810 - 30 - 0.120.30.50.81.2234610142540601001402504006001000140023 - 60.12 - 0.240.40.611.52.545812183048751201803004807501200180036 - 100.24 - 0.40.40.611.52.5469152236589015022036058090015002200410 - 180.4 - 0.710.50.81.223581118274370110180270430700110018002700518 - 300.71 - 1.190.611.52.54691321335284130210330520840130021003300630 - 501.19 - 1.970.611.52.54711162539621001602503906201000160025003900750 - 801.97 - 3.150.81.2235813193046741201903004607401200190030004600880 - 1203.15 - 4.7311.52.54610152235548714022035054087014002200350054009120 - 1804.73 - 7.091.223.55812182540631001602504006301000160025004000630010180 - 2507.09 - 9.85234.571014202946721151852904607201150185029004600720011250 - 3159.85 - 12.412.54681216233252811302103205208101300210032005200810012315 - 40012.41 - 15.7535791318253657891402303605708901400230036005700890013400 - 50015.75 - 19.7468101520274063971552504006309701550250040006300970014500 - 63019.7 - 24.84.569111622324470110175280440700110017502800440070001100015630 - 80024.8 - 31.55710131825365080125200320500800125020003200500080001250016800 - 100031.5 - 39.45.58111521284056901402303605609001400230036005600900014000171000 - 125039.4 - 49.26.59131824334766105165260420660105016502600420066001050016500181250 - 160049.2 - 63811152129395578125195310500780125019503100500078001250019500191600 - 200063 - 78.7913182535466592150230370600920150023003700600092001500023000202000 - 250078.7 - 98.4111522304155781101752804407001100175028004400700011001750028000212500 - 315098.4 - 1241318263650689613521033054086013502100330054008600135002100033000Fundamental deviation of holes ChartClick the Tolerance Link (e.g., H ➢) to get the Full & Accurate charts for a specific deviation in Inch and Metric unitsClick  icons to show all columns for the entire diameter range (0-3,150 mm)The deviations of J through Z also depend on the IT Therefore, the values in the below table are only accurate in some cases. To get the correct value in all cases, click the Tolerance Link (e.g., H ➢).Dimentions in Microns. To convert to millimeters, divide by 1000, to Thous, divide by 25.4 Deviationidurl0 - 3 mm3 - 6 mm6 - 1010 - 1414 - 1818 - 2424 - 3030 - 4040 - 5050 - 6565 - 8080 - 100100 - 120120 - 140140 - 160160 - 180180 - 200200 - 225225 - 250250 - 280280 - 315315 - 355355 - 400400 - 450450 - 500500 - 560560 - 630630 - 710710 - 800800 - 900900 - 10001000 - 11201120 - 12501250 - 14001400 - 16001600 - 18001800 - 20002000 - 22402240 - 25002500 - 28002800 - 3150A ➢1calculators/tolerances/tol?dev=a||A ➢27027028029029030030031032034036038041046052058066074082092010501200135015001650XXXXXXXXXXXXXXXXB ➢2calculators/tolerances/tol?dev=b||B ➢140140150150150160160170180190200220240260280310340380420480540600680760840XXXXXXXXXXXXXXXXC ➢3calculators/tolerances/tol?dev=c||C ➢6070809595110110120130140150170180200210230240260280300330360400440480520580640700780860940105011501300145016001800200022002500CD ➢4calculators/tolerances/tol?dev=cd||CD ➢344656XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXD ➢5calculators/tolerances/tol?dev=d||D ➢203040505065658080100100120120145145145170170170190190210210230230260260290290320320350350390390430430480480520520E ➢6calculators/tolerances/tol?dev=e||E ➢14202532324040505060607272858585100100100110110125125135135145145160160170170195195220220240240260260290290EF ➢7calculators/tolerances/tol?dev=ef||EF ➢101418XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXF ➢8calculators/tolerances/tol?dev=f||F ➢61013161620202525303036364343435050505656626268687676808086869898110110120120130130145145FG ➢9calculators/tolerances/tol?dev=fg||FG ➢468XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXG ➢10calculators/tolerances/tol?dev=g||G ➢2456677991010121214141415151517171818202022222424262628283030323234343838H ➢11calculators/tolerances/tol?dev=h||H ➢00000000000000000000000000000000000000000JS ➢12calculators/tolerances/tol?dev=js||JS ➢00000000000000000000000000000000000000000J ➢13calculators/tolerances/tol?dev=j||J ➢46810101212141418182222262626303030363639394343XXXXXXXXXXXXXXXXK ➢14calculators/tolerances/tol?dev=k||K ➢0-1-1-1-1-2-2-2-2-2-2-3-3-3-3-3-4-4-4-4-4-4-4-5-50000000000000000M ➢15calculators/tolerances/tol?dev=m||M ➢-2-4-6-7-7-8-8-9-9-11-11-13-13-15-15-15-17-17-17-20-20-21-21-23-23-26-26-30-30-34-34-40-40-48-48-58-58-68-68-76-76N ➢16calculators/tolerances/tol?dev=n||N ➢-4-8-10-12-12-15-15-17-17-20-20-23-23-27-27-27-31-31-31-34-34-37-37-40-40-44-44-50-50-56-56-66-66-78-78-92-92-110-110-135-135P ➢17calculators/tolerances/tol?dev=p||P ➢-6-12-15-18-18-22-22-26-26-32-32-37-37-43-43-43-50-50-50-56-56-62-62-68-68-78-78-88-88-100-100-120-120-140-140-170-170-195-195-240-240R ➢18calculators/tolerances/tol?dev=r||R ➢-10-15-19-23-23-28-28-34-34-41-43-51-54-63-65-68-77-80-84-94-98-108-114-126-132-150-155-175-185-210-220-250-260-300-330-370-400-440-460-550-580S ➢19calculators/tolerances/tol?dev=s||S ➢-14-19-23-28-28-35-35-43-43-53-59-71-79-92-100-108-122-130-140-158-170-190-208-232-252-280-310-340-380-430-470-520-580-640-720-820-920-1000-1100-1250-1400T ➢20calculators/tolerances/tol?dev=t||T ➢000XXX-41-48-54-66-75-91-104-122-134-146-166-180-196-218-240-268-294-330-360-400-450-500-560-620-680-780-840-960-1050-1200-1350-1500-1650-1900-2100U ➢21calculators/tolerances/tol?dev=u||U ➢-18-23-28-33-33-41-48-60-70-87-102-124-144-170-190-210-236-258-284-315-350-390-435-490-540-600-660-740-840-940-1050-1150-1300-1450-1600-1850-2000-2300-2500-2900-3200V ➢22calculators/tolerances/tol?dev=v||V ➢000X-39-47-55-68-81-102-120-146-172-202-228-252-284-310-340-385-425-475-530-595-660-740-820-920-1000-1150-1300-1450-1600-1800-2000-2300-2500-2800-3100-3500-3900X ➢23calculators/tolerances/tol?dev=x||X ➢-20-28-34-40-45-54-64-80-97-122-146-178-210-248-280-310-340-385-425-475-525-590-660-740-820XXXXXXXXXXXXXXXXY ➢24calculators/tolerances/tol?dev=y||Y ➢000XX-63-75-94-114-144-174-214-254-300-340-380-425-470-520-580-650-730-820-920-1000XXXXXXXXXXXXXXXXZ ➢25calculators/tolerances/tol?dev=z||Z ➢-26-35-42-50-60-73-88-112-136-172-210-258-310-365-415-465-520-575-640-710-790-900-1000-1100-1250XXXXXXXXXXXXXXXXZA ➢26calculators/tolerances/tol?dev=za||ZA ➢-32-42-52-64-77-98-118-148-180-226-274-335-400-470-535-600-670-740-820-920-1000-1150-1300-1450-1600XXXXXXXXXXXXXXXXFundamental deviation of shafts ChartClick the Tolerance Link (e.g., g ➢) to get the Full & Accurate charts for a specific deviation in Inch and Metric unitsClick  icons to show all columns of the entire diameter range (0-3,150 mm)The deviations of J through Z also depend on the IT Therefore, the values in the below table are only accurate in some cases. To get the correct value in all cases, click the Tolerance Link (e.g., g ➢).Dimentions in Microns. To convert to millimeters, divide by 1000, to Thous, divide by 25.4 Deviationidurl0 - 3 mm3 - 6 mm6 - 1010 - 1414 - 1818 - 2424 - 3030 - 4040 - 5050 - 6565 - 8080 - 100100 - 120120 - 140140 - 160160 - 180180 - 200200 - 225225 - 250250 - 280280 - 315315 - 355355 - 400400 - 450450 - 500500 - 560560 - 630630 - 710710 - 800800 - 900900 - 10001000 - 11201120 - 12501250 - 14001400 - 16001600 - 18001800 - 20002000 - 22402240 - 25002500 - 28002800 - 3150a ➢1calculators/tolerances/tol?dev=a||A ➢-270-270-280-290-290-300-300-310-320-340-360-380-410-460-520-580-660-740-820-920-1050-1200-1350-1500-1650XXXXXXXXXXXXXXXXb ➢2calculators/tolerances/tol?dev=b||B ➢-140-140-150-150-150-160-160-170-180-190-200-220-240-260-280-310-340-380-420-480-540-600-680-760-840XXXXXXXXXXXXXXXXc ➢3calculators/tolerances/tol?dev=c||C ➢-60-70-80-95-95-110-110-120-130-140-150-170-180-200-210-230-240-260-280-300-330-360-400-440-480-520-580-640-700-780-860-940-1050-1150-1300-1450-1600-1800-2000-2200-2500cd ➢4calculators/tolerances/tol?dev=cd||CD ➢-34-46-56XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXd ➢5calculators/tolerances/tol?dev=d||D ➢-20-30-40-50-50-65-65-80-80-100-100-120-120-145-145-145-170-170-170-190-190-210-210-230-230-260-260-290-290-320-320-350-350-390-390-430-430-480-480-520-520e ➢6calculators/tolerances/tol?dev=e||E ➢-14-20-25-32-32-40-40-50-50-60-60-72-72-85-85-85-100-100-100-110-110-125-125-135-135-145-145-160-160-170-170-195-195-220-220-240-240-260-260-290-290ef ➢7calculators/tolerances/tol?dev=ef||EF ➢-10-14-18XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXf ➢8calculators/tolerances/tol?dev=f||F ➢-6-10-13-16-16-20-20-25-25-30-30-36-36-43-43-43-50-50-50-56-56-62-62-68-68-76-76-80-80-86-86-98-98-110-110-120-120-130-130-145-145fg ➢9calculators/tolerances/tol?dev=fg||FG ➢-4-6-8XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXg ➢10calculators/tolerances/tol?dev=g||G ➢-2-4-5-6-6-7-7-9-9-10-10-12-12-14-14-14-15-15-15-17-17-18-18-20-20-22-22-24-24-26-26-28-28-30-30-32-32-34-34-38-38h ➢11calculators/tolerances/tol?dev=h||H ➢00000000000000000000000000000000000000000js ➢12calculators/tolerances/tol?dev=js||JS ➢00000000000000000000000000000000000000000j ➢13calculators/tolerances/tol?dev=j||J ➢-4-6-8-10-10-12-12-14-14-18-18-22-22-26-26-26-30-30-30-36-36-39-39-43-43XXXXXXXXXXXXXXXXk ➢14calculators/tolerances/tol?dev=k||K ➢01111222222333334444444550000000000000000m ➢15calculators/tolerances/tol?dev=m||M ➢2467788991111131315151517171720202121232326263030343440404848585868687676n ➢16calculators/tolerances/tol?dev=n||N ➢481012121515171720202323272727313131343437374040444450505656666678789292110110135135p ➢17calculators/tolerances/tol?dev=p||P ➢612151818222226263232373743434350505056566262686878788888100100120120140140170170195195240240r ➢18calculators/tolerances/tol?dev=r||R ➢101519232328283434414351546365687780849498108114126132150155175185210220250260300330370400440460550580s ➢19calculators/tolerances/tol?dev=s||S ➢14192328283535434353597179921001081221301401581701902082322522803103403804304705205806407208209201000110012501400t ➢20calculators/tolerances/tol?dev=t||T ➢000XXX4148546675911041221341461661801962182402682943303604004505005606206807808409601050120013501500165019002100u ➢21calculators/tolerances/tol?dev=u||U ➢1823283333414860708710212414417019021023625828431535039043549054060066074084094010501150130014501600185020002300250029003200v ➢22calculators/tolerances/tol?dev=v||V ➢000X39475568811021201461722022282522843103403854254755305956607408209201000115013001450160018002000230025002800310035003900x ➢23calculators/tolerances/tol?dev=x||X ➢202834404554648097122146178210248280310340385425475525590660740820XXXXXXXXXXXXXXXXy ➢24calculators/tolerances/tol?dev=y||Y ➢000XX6375941141441742142543003403804254705205806507308209201000XXXXXXXXXXXXXXXXz ➢25calculators/tolerances/tol?dev=z||Z ➢26354250607388112136172210258310365415465520575640710790900100011001250XXXXXXXXXXXXXXXXza ➢26calculators/tolerances/tol?dev=za||ZA ➢32425264779811814818022627433540047053560067074082092010001150130014501600XXXXXXXXXXXXXXXXEngineering FitsEngineering fit refers to the degree of tightness or looseness between two mating parts in an assembly. It is defined by combining a hole with a tolerance class and a shaft with a tolerance class. (See definition of terms above).Several standards define recommended pairings for different applications. The values presented in our charts and Calculator are based on ISO 286-1:2010 (In earlier revisions, it was separated into ISO 1829, which is now obsolete). In North America, additional fit combinations are sometimes used per ANSI B4.1 & B4.2. The ANSI tolerancing system is nearly equivalent to ISO 286 but not identical. The difference is typically 0.1-0.5 thous.Main Fit TypesClearance FitA clearance fit is a type in which the shaft is smaller than the hole it is inserted into, allowing for free movement, assembly, and disassembly. Clearance fits can range from loose-running for assemblies that need a significant gap for free movement or to accommodate temperature variation to locational clearance for stationary parts that need to be freely assembled/disassembled but still maintain accuracy.Transition FitA transition fit is a type in which the shaft may be slightly smaller or larger than the hole (before assembly). It is used to create a tight and secure connection between them in applications requiring high precision and stability. It provides high accuracy, but the connecting parts can be disassembled and reassembled without damage. However, force cannot be transmitted.Press Fit (Interference)An interference (Press) fit is a type in which the shaft is larger than the hole (before assembly). It creates a frictional force that holds the parts together without the need for additional fasteners or adhesives. The interference fit is commonly used in mechanical engineering to create solid and reliable connections between components that need to withstand heavy loads or vibrations. However, It is hard to disassemble without damaging the parts. Some degree of force can be transmitted between the components.Fits are also divided into two types of “basis”There are no technical differences between the two basis. Therefore the choice of the system should be based on economic reasons.Hole Basis FitsThe hole deviation is zero (meaning an H), and the shaft deviation varies to create different fit levels. For example, H9/d8 , H7/g6. It is the first choice of combinations for general use, since it avoids an unnecessary multiplicity of tools (e.g., reamers) and gaugesShaft Basis FitsThe shaft deviation is zero (meaning an h), and the hole deviation varies to create different fit levels. For example, D9/h9, G7/h6. This method should only be utilized when it offers clear economic benefits, such as in situations where it is required to assemble multiple parts with holes that have varying deviations onto a single shaft.Fits Standard Combinations ChartsFor ordinary engineering purposes, only a small number of the many (~150,000) possible fit combinations is required. ISO 286-1:2010 lists about 80 fit combinations that meet most of the needs of any engineering task. You can choose from this list or define a custom combination in our Fit Calculator.(*) In North America, additional fit combinations are sometimes used per ANSI B4.1 & B4.2. You can find below the ISO charts also the ANSI Charts.Click the Fit Link (e.g. G7/h6 ➢) to get its detailed tolerances in both Inch and millimetersHole Basis Fits (ISO 286-1)fit_typeFitFit LevelPreferedc_idfit_sortFit typeLeveliH10/b9 ➢DGNC1Clearance Fit6.00iH11/b11 ➢DGYC1Clearance Fit6.00iH10/c9 ➢DGNC1Clearance Fit5.00iH11/c11 ➢DGYC1Clearance Fit5.00iH8/d8 ➢GRNC1Clearance Fit4.00iH9/d8 ➢GRNC1Clearance Fit4.00iH10/d9 ➢GRYC1Clearance Fit4.00iH11/d10 ➢GRNC1Clearance Fit4.00iH10/e9 ➢GRNC1Clearance Fit3.00iH9/e8 ➢GRYC1Clearance Fit3.00iH8/e8 ➢GRYC1Clearance Fit3.00iH8/e7 ➢GRNC1Clearance Fit3.00iH7/f6 ➢LGNC1Clearance Fit2.00iH9/f8 ➢LGNC1Clearance Fit2.00iH8/f8 ➢LGNC1Clearance Fit2.00iH8/f7 ➢LGYC1Clearance Fit2.00iH7/g6 ➢LGYC1Clearance Fit1.00iH6/g5 ➢LGNC1Clearance Fit1.00iH10/h9 ➢LGYC1Clearance Fit0.00iH11/h10 ➢LGNC1Clearance Fit0.00iH9/h8 ➢LGNC1Clearance Fit0.00iH8/h8 ➢LGNC1Clearance Fit0.00iH6/h5 ➢LGNC1Clearance Fit0.00iH7/h6 ➢LGYC1Clearance Fit0.00iH8/h7 ➢LGYC1Clearance Fit-1.00iH6/js5 ➢orNT2Transition Fit-1.00iH7/js6 ➢orYT2Transition Fit-1.00iH8/k7 ➢orNT2Transition Fit-3.00iH6/k5 ➢orNT2Transition Fit-3.00iH7/k6 ➢orYT2Transition Fit-3.00iH7/m6 ➢orNT2Transition Fit-5.00iH6/m5 ➢orNT2Transition Fit-5.00iH8/m7 ➢orNT2Transition Fit-5.00iH7/n6 ➢orYT2Transition Fit-6.00iH8/js7 ➢orNT2Transition Fit-11.00iH6/n5 ➢LRNI3Press Fit (Interference)-6.00iH7/p6 ➢LRYI3Press Fit (Interference)-8.00iH6/p5 ➢LRNI3Press Fit (Interference)-8.00iH7/r6 ➢LRYI3Press Fit (Interference)-10.00iH7/s6 ➢RDYI3Press Fit (Interference)-11.00iH8/s7 ➢RDNI3Press Fit (Interference)-11.00iH7/t6 ➢RDNI3Press Fit (Interference)-12.00iH7/u6 ➢DRNI3Press Fit (Interference)-13.00iH8/u7 ➢DRNI3Press Fit (Interference)-13.00iH7/x6 ➢DRNI3Press Fit (Interference)-16.00Shaft Basis Fits (ISO 286-1)fit_typeFitFit LevelPreferedc_idfit_sortFit typeLeveliH10/b9 ➢DGNC1Clearance Fit6.00iH11/b11 ➢DGYC1Clearance Fit6.00iH10/c9 ➢DGNC1Clearance Fit5.00iH11/c11 ➢DGYC1Clearance Fit5.00iH8/d8 ➢GRNC1Clearance Fit4.00iH9/d8 ➢GRNC1Clearance Fit4.00iH10/d9 ➢GRYC1Clearance Fit4.00iH11/d10 ➢GRNC1Clearance Fit4.00iH10/e9 ➢GRNC1Clearance Fit3.00iH9/e8 ➢GRYC1Clearance Fit3.00iH8/e8 ➢GRYC1Clearance Fit3.00iH8/e7 ➢GRNC1Clearance Fit3.00iH7/f6 ➢LGNC1Clearance Fit2.00iH9/f8 ➢LGNC1Clearance Fit2.00iH8/f8 ➢LGNC1Clearance Fit2.00iH8/f7 ➢LGYC1Clearance Fit2.00iH7/g6 ➢LGYC1Clearance Fit1.00iH6/g5 ➢LGNC1Clearance Fit1.00iH10/h9 ➢LGYC1Clearance Fit0.00iH11/h10 ➢LGNC1Clearance Fit0.00iH9/h8 ➢LGNC1Clearance Fit0.00iH8/h8 ➢LGNC1Clearance Fit0.00iH6/h5 ➢LGNC1Clearance Fit0.00iH7/h6 ➢LGYC1Clearance Fit0.00iH8/h7 ➢LGYC1Clearance Fit-1.00iH6/js5 ➢orNT2Transition Fit-1.00iH7/js6 ➢orYT2Transition Fit-1.00iH8/k7 ➢orNT2Transition Fit-3.00iH6/k5 ➢orNT2Transition Fit-3.00iH7/k6 ➢orYT2Transition Fit-3.00iH7/m6 ➢orNT2Transition Fit-5.00iH6/m5 ➢orNT2Transition Fit-5.00iH8/m7 ➢orNT2Transition Fit-5.00iH7/n6 ➢orYT2Transition Fit-6.00iH8/js7 ➢orNT2Transition Fit-11.00iH6/n5 ➢LRNI3Press Fit (Interference)-6.00iH7/p6 ➢LRYI3Press Fit (Interference)-8.00iH6/p5 ➢LRNI3Press Fit (Interference)-8.00iH7/r6 ➢LRYI3Press Fit (Interference)-10.00iH7/s6 ➢RDYI3Press Fit (Interference)-11.00iH8/s7 ➢RDNI3Press Fit (Interference)-11.00iH7/t6 ➢RDNI3Press Fit (Interference)-12.00iH7/u6 ➢DRNI3Press Fit (Interference)-13.00iH8/u7 ➢DRNI3Press Fit (Interference)-13.00iH7/x6 ➢DRNI3Press Fit (Interference)-16.00Fit Combinations Per ANSI B4.1The tolerance classes mentioned in ANSI B4.1 (e.g., h9, g6, etc.) have the same nomenclature as in ISO 286. It could lead a confusion since the ANSI standard also defines the fundamental deviations and the tolerance grade on its own. The ANSI tolerancing system is nearly the same as the ISO 286 but not identical. If you take the values from the standard ISO charts or use our Online Calculator, you should expect about 0.1-0.5 thous errors. wdt_IDFit NameTolerance Class CombinationFit Typeth1RC 1H5/g4Running or Slidining Fits52RC 2H6/g5Running or Slidining Fits63RC 3H7/f6Running or Slidining Fits74RC 4H8/f7Running or Slidining Fits85RC 5H8/e7Running or Slidining Fits86RC 6H9/e8Running or Slidining Fits97RC 7H9/d8Running or Slidining Fits98RC 8H10/c9Running or Slidining Fits109RC 9H11/sh1Running or Slidining Fits1110LC 1H6/h5Clearance Location Fits611LC 2H7/h6Clearance Location Fits712LC 3H8/h7Clearance Location Fits813LC 4H10/h9Clearance Location Fits1014LC 5H7/g6Clearance Location Fits715LC 6H9/f8Clearance Location Fits916LC 7H10/e9Clearance Location Fits1017LC 8H10/d9Clearance Location Fits1018LC 9H11/c10Clearance Location Fits1119LC 10H12/sh2Clearance Location Fits1220LC 11H13/sh3Clearance Location Fits1321LT 1H7/js6Transition Fits722LT 2H8/js7Transition Fits823LT 3H7/k6Transition Fits724LT 4H8/k7Transition Fits825LT 5H7/n6Transition Fits726LT 6H7/n7Transition Fits727LN 1H6/n5Interference Location Fits628LN 2H7/p6Interference Location Fits729LN 3H7/r6Interference Location Fits730FN 1H6/sh4Force or Shrink Fits631FN 2H7/s6Force or Shrink Fits732FN 3H7/t6Force or Shrink Fits733FN 4H7/u6Force or Shrink Fits734FN 5H8/x7Force or Shrink Fits8Fit Combinations Per ANSI B4.2The tolerance classes mentioned in ANSI B4.1 (e.g., h9, g6, etc.) have the same nomenclature as in ISO 286. It could lead a confusion since the ANSI standard also defines the fundamental deviations and the tolerance grade on its own. The ANSI tolerancing system is nearly the same as the ISO 286 but not identical. If you take the values from the standard ISO charts or use our Online Calculator, you should expect about 0.1-0.5 thous errors.ClassificationHole BasisShaft BasisDescriptionClearanceH11/c11C11/h11Loose running fit for wide commercial tolerances or allowances on external members.H9/d9D9/h9Free running fit not for use where accuracy is essential, but good for large temperature variations, high running speeds, or heavy journal pressures.H8/f7F8/h7Close running fit for running on accurate machines and for accurate location at moderate speeds and journal pressures.H7/g6G7/h6Sliding fit not intended to run freely, but to move and turn freely and locate accurately.H7/h6H7/h6Locational clearance fit provides snug fit for locating stationary parts; but can be freely assembled and disassembled.InterferenceH7/k6K7/h6Locational transition fit for accurate location, a compromise between clearance and interference.H7/n6N7/h6Locational transition fit for more accurate location where greater interference is permissible.TransitionH7/p6P7/h6Locational interference fit for parts requiring rigidity and alignment with prime accuracy of location but without special bore pressure requirements.H7/s6S7/h6Medium drive fit for ordinary steel parts or shrink fits on light sections, the tightest fit usable with cast iron.H7/u6U7/h6Force fit suitable for parts which can be highly stressed or for shrink fits where the heavy pressing forces required are impractical.Related Glossary Terms:Thou