Feed and Speed Calculators - chipload calculator

2024-09-03 18:19:57

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-UN. For example, 12-UN or 8-UN. The pitch remains the same for the whole diameter range in these series. However, they are much less popular.Class:The class is defined by a two-character code.The first character is a digit between 1 and 3. 3=Tight fit, 2=Medium fit, and 1=Loose fit.The second character is a letter. A=External thread and B=Internal thread.For a detailed explanation of classes, read the dedicated section below.Additional Parameters:Direction: By default, the thread is right-hand. For a left-hand thread, add the suffix -LH.Number of Starts: By default, all threads have a single start. Thus the lead equals the pitch. For a multiple-start thread, the lead is also indicated. For example: 3/4– 0.0625P – 0.1875L UNF denotes a 3/4″ UNF thread with 3 starts. (0.1875/0.0625=3)Designation Examples of Unified ThreadsDesignationThread SeriesInternal /ExternalNominalDiameterTPIPitchLeadClassNumber of StartsThreadDirection#8-32 UNCUNCundefined0.164"320.03125"0.03125"undefined1Right hand1/4 -28 UNF-2AUNFExternal0.25"280.0357"0.0357"2A1Right hand3/4-20 UNEF-3BUNEFInternal0.75"200.05"0.05"3B1Right hand1-12 UN-1AConstant Pitch12 TPIExternal1"120.0833"0.0833"1A1Right hand3/4– 0.0625P – 0.1875L UNF-2AUNFExternal0.75"160.0625"0.1875"2A3Right hand1/4 -28 UNF-2A-LHUNFExternal0.25"280.0357"0.0357"2A1Left handPossible Combinations (Diameter/Pitch)The charts below show all the possible thread combinations that are defined in ASTM B1.1UNC– Unified Inch Coarse Thread SeriesUNF – Unified Inch Fine Thread SeriesUNEF – Unified Inch Extra Fine Thread Series

22325 has a cylindrical shape and is designed with imperial measurements, ensuring compatibility with other imperial-sized components. 22325 outer dia is 3.25".

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ZIP Code 225000. The ZIP code 225000 belongs to the district Yangzhou in the province Jiangsu, China.

Un thread calculatorinches

Definition of terms:Allowance (Deviation): The minimum permissible distance between the basic and actual profile.Tolerance: The width of the tolerance field of a diameter on the actual thread profile. (Pitch, Major & Minor diameters)

Click the Thread Link to get the Full Thread Data for all classesAll dimensions are in inches. To view the Metric translation, click the Thread LinkClick icon to show Additional columnsClick icon to show Full Thread DataThreadBasic DiamTPIPitchPitch DiamThread HeightCres/ RootTap Drill SizeLead AngleMinor DiameterThread addendumseriesid#12 - 32 UNEF0.216320.03130.19570.01690.00780.18762.91°0.17880.0101Metric Values ➢Classes & Tolerances ➢UNEF231/4 - 32 UNEF0.25320.03130.22970.01690.00780.22162.48°0.21280.0101Metric Values ➢Classes & Tolerances ➢UNEF285/16 - 32 UNEF0.312320.03130.29170.01690.00780.28361.95°0.27480.0101Metric Values ➢Classes & Tolerances ➢UNEF343/8 - 32 UNEF0.375320.03130.35470.01690.00780.34661.61°0.33780.0101Metric Values ➢Classes & Tolerances ➢UNEF407/16 - 28 UNEF0.437280.03570.41380.01930.00890.40451.57°0.39450.0116Metric Values ➢Classes & Tolerances ➢UNEF471/2 - 28 UNEF0.5280.03570.47680.01930.00890.46751.37°0.45750.0116Metric Values ➢Classes & Tolerances ➢UNEF549/16 - 24 UNEF0.562240.04170.53490.02260.01040.52411.42°0.51240.0135Metric Values ➢Classes & Tolerances ➢UNEF615/8 - 24 UNEF0.625240.04170.59790.02260.01040.58711.27°0.57540.0135Metric Values ➢Classes & Tolerances ➢UNEF6911/16 - 24 UNEF0.687240.04170.65990.02260.01040.64911.15°0.63740.0135Metric Values ➢Classes & Tolerances ➢UNEF753/4 - 20 UNEF0.75200.05000.71750.02710.01250.70451.27°0.69050.0162Metric Values ➢Classes & Tolerances ➢UNEF8313/16 - 20 UNEF0.812200.05000.77950.02710.01250.76651.17°0.75250.0162Metric Values ➢Classes & Tolerances ➢UNEF897/8 - 20 UNEF0.875200.05000.84250.02710.01250.82951.08°0.81550.0162Metric Values ➢Classes & Tolerances ➢UNEF9715/16 - 20 UNEF0.937200.05000.90450.02710.01250.89151.01°0.87750.0162Metric Values ➢Classes & Tolerances ➢UNEF1031 - 20 UNEF1200.05000.96750.02710.01250.95450.94°0.94050.0162Metric Values ➢Classes & Tolerances ➢UNEF1111 1/16 - 18 UNEF1.062180.05561.02590.03010.01391.01140.99°0.99580.018Metric Values ➢Classes & Tolerances ➢UNEF1181 1/8 - 18 UNEF1.125180.05561.08890.03010.01391.07440.93°1.05880.018Metric Values ➢Classes & Tolerances ➢UNEF1261 3/16 - 18 UNEF1.187180.05561.15090.03010.01391.13640.88°1.12080.018Metric Values ➢Classes & Tolerances ➢UNEF1321 1/4 - 18 UNEF1.25180.05561.21390.03010.01391.19940.83°1.18380.018Metric Values ➢Classes & Tolerances ➢UNEF1401 5/16 - 18 UNEF1.312180.05561.27590.03010.01391.26140.79°1.24580.018Metric Values ➢Classes & Tolerances ➢UNEF1461 3/8 - 18 UNEF1.375180.05561.33890.03010.01391.32440.76°1.30880.018Metric Values ➢Classes & Tolerances ➢UNEF1541 7/16 - 18 UNEF1.437180.05561.40090.03010.01391.38640.72°1.37080.018Metric Values ➢Classes & Tolerances ➢UNEF1611 1/2 - 18 UNEF1.5180.05561.46390.03010.01391.44940.69°1.43380.018Metric Values ➢Classes & Tolerances ➢UNEF1701 9/16 - 18 UNEF1.562180.05561.52590.03010.01391.51140.66°1.49580.018Metric Values ➢Classes & Tolerances ➢UNEF1771 5/8 - 18 UNEF1.625180.05561.58890.03010.01391.57440.64°1.55880.018Metric Values ➢Classes & Tolerances ➢UNEF1831 11/16 - 18 UNEF1.687180.05561.65090.03010.01391.63640.61°1.62080.018Metric Values ➢Classes & Tolerances ➢UNEF189UN Constant Pitch Series Basic Dimensions chartClick the Thread Link to get the Full Thread Data for all classesAll dimensions are in inches. To view the Metric translation, click the Thread LinkClick icon to show Additional columnsClick icon to show Full Thread DataThreadBasic DiamTPIPitchPitch DiamThread HeightCres/ RootTap Drill SizeLead AngleMinor DiameterThread addendumseriesid9/16 - 12 12-UN0.562120.08330.50790.04510.02080.48622.99°0.46280.0271Metric Values ➢Classes & Tolerances ➢12-UN625/8 - 12 12-UN0.625120.08330.57090.04510.02080.54922.66°0.52580.0271Metric Values ➢Classes & Tolerances ➢12-UN7011/16 - 12 12-UN0.687120.08330.63290.04510.02080.61122.4°0.58780.0271Metric Values ➢Classes & Tolerances ➢12-UN763/4 - 12 12-UN0.75120.08330.69590.04510.02080.67422.18°0.65080.0271Metric Values ➢Classes & Tolerances ➢12-UN8413/16 - 12 12-UN0.812120.08330.75790.04510.02080.73622°0.71280.0271Metric Values ➢Classes & Tolerances ➢12-UN907/8 - 12 12-UN0.875120.08330.82090.04510.02080.79921.85°0.77580.0271Metric Values ➢Classes & Tolerances ➢12-UN9815/16 - 12 12-UN0.937120.08330.88290.04510.02080.86121.72°0.83780.0271Metric Values ➢Classes & Tolerances ➢12-UN1041 - 12 12-UN1120.08330.94590.04510.02080.92421.61°0.90080.0271Metric Values ➢Classes & Tolerances ➢12-UN1131 1/16 - 12 12-UN1.062120.08331.00790.04510.02080.98621.51°0.96280.0271Metric Values ➢Classes & Tolerances ➢12-UN1201 1/8 - 12 12-UN1.125120.08331.07090.04510.02081.04921.42°1.02580.0271Metric Values ➢Classes & Tolerances ➢12-UN1281 3/16 - 12 12-UN1.187120.08331.13290.04510.02081.11121.34°1.08780.0271Metric Values ➢Classes & Tolerances ➢12-UN1341 1/4 - 12 12-UN1.25120.08331.19590.04510.02081.17421.27°1.15080.0271Metric Values ➢Classes & Tolerances ➢12-UN1421 5/16 - 12 12-UN1.312120.08331.25790.04510.02081.23621.21°1.21280.0271Metric Values ➢Classes & Tolerances ➢12-UN1481 3/8 - 12 12-UN1.375120.08331.32090.04510.02081.29921.15°1.27580.0271Metric Values ➢Classes & Tolerances ➢12-UN1571 7/16 - 12 12-UN1.437120.08331.38290.04510.02081.36121.1°1.33780.0271Metric Values ➢Classes & Tolerances ➢12-UN1641 1/2 - 12 12-UN1.5120.08331.44590.04510.02081.42421.05°1.40080.0271Metric Values ➢Classes & Tolerances ➢12-UN1731 9/16 - 12 12-UN1.562120.08331.50790.04510.02081.48621.01°1.46280.0271Metric Values ➢Classes & Tolerances ➢12-UN1801 5/8 - 12 12-UN1.625120.08331.57090.04510.02081.54920.97°1.52580.0271Metric Values ➢Classes & Tolerances ➢12-UN1861 11/16 - 12 12-UN1.687120.08331.63290.04510.02081.61120.93°1.58780.0271Metric Values ➢Classes & Tolerances ➢12-UN1921 3/4 - 12 12-UN1.75120.08331.69590.04510.02081.67420.9°1.65080.0271Metric Values ➢Classes & Tolerances ➢12-UN1981 13/16 - 12 12-UN1.812120.08331.75790.04510.02081.73620.86°1.71280.0271Metric Values ➢Classes & Tolerances ➢12-UN2031 7/8 - 12 12-UN1.875120.08331.82090.04510.02081.79920.83°1.77580.0271Metric Values ➢Classes & Tolerances ➢12-UN2081 15/16 - 12 12-UN1.937120.08331.88290.04510.02081.86120.81°1.83780.0271Metric Values ➢Classes & Tolerances ➢12-UN2132 - 12 12-UN2120.08331.94590.04510.02081.92420.78°1.90080.0271Metric Values ➢Classes & Tolerances ➢12-UN2192 1/8 - 12 12-UN2.125120.08332.07090.04510.02082.04920.73°2.02580.0271Metric Values ➢Classes & Tolerances ➢12-UN2242 1/4 - 12 12-UN2.25120.08332.19590.04510.02082.17420.69°2.15080.0271Metric Values ➢Classes & Tolerances ➢12-UN2302 3/8 - 12 12-UN2.375120.08332.32090.04510.02082.29920.65°2.27580.0271Metric Values ➢Classes & Tolerances ➢12-UN2352 1/2 - 12 12-UN2.5120.08332.44590.04510.02082.42420.62°2.40080.0271Metric Values ➢Classes & Tolerances ➢12-UN2422 5/8 - 12 12-UN2.625120.08332.57090.04510.02082.54920.59°2.52580.0271Metric Values ➢Classes & Tolerances ➢12-UN2482 3/4 - 12 12-UN2.75120.08332.69590.04510.02082.67420.56°2.65080.0271Metric Values ➢Classes & Tolerances ➢12-UN2552 7/8 - 12 12-UN2.875120.08332.82090.04510.02082.79920.54°2.77580.0271Metric Values ➢Classes & Tolerances ➢12-UN2613 - 12 12-UN3120.08332.94590.04510.02082.92420.52°2.90080.0271Metric Values ➢Classes & Tolerances ➢12-UN2683 1/8 - 12 12-UN3.125120.08333.07090.04510.02083.04920.49°3.02580.0271Metric Values ➢Classes & Tolerances ➢12-UN2743 1/4 - 12 12-UN3.25120.08333.19590.04510.02083.17420.48°3.15080.0271Metric Values ➢Classes & Tolerances ➢12-UN2803 3/8 - 12 12-UN3.375120.08333.32090.04510.02083.29920.46°3.27580.0271Metric Values ➢Classes & Tolerances ➢12-UN2853 1/2 - 12 12-UN3.5120.08333.44590.04510.02083.42420.44°3.40080.0271Metric Values ➢Classes & Tolerances ➢12-UN2913 5/8 - 12 12-UN3.625120.08333.57090.04510.02083.54920.43°3.52580.0271Metric Values ➢Classes & Tolerances ➢12-UN2963 3/4 - 12 12-UN3.75120.08333.69590.04510.02083.67420.41°3.65080.0271Metric Values ➢Classes & Tolerances ➢12-UN3023 7/8 - 12 12-UN3.875120.08333.82090.04510.02083.79920.4°3.77580.0271Metric Values ➢Classes & Tolerances ➢12-UN3074 - 12 12-UN4120.08333.94590.04510.02083.92420.39°3.90080.0271Metric Values ➢Classes & Tolerances ➢12-UN3134 1/8 - 12 12-UN4.125120.08334.07090.04510.02084.04920.37°4.02580.0271Metric Values ➢Classes & Tolerances ➢12-UN3184 1/4 - 12 12-UN4.25120.08334.19590.04510.02084.17420.36°4.15080.0271Metric Values ➢Classes & Tolerances ➢12-UN3234 3/8 - 12 12-UN4.375120.08334.32090.04510.02084.29920.35°4.27580.0271Metric Values ➢Classes & Tolerances ➢12-UN3284 1/2 - 12 12-UN4.5120.08334.44590.04510.02084.42420.34°4.40080.0271Metric Values ➢Classes & Tolerances ➢12-UN3334 5/8 - 12 12-UN4.625120.08334.57090.04510.02084.54920.33°4.52580.0271Metric Values ➢Classes & Tolerances ➢12-UN3384 3/4 - 12 12-UN4.75120.08334.69590.04510.02084.67420.32°4.65080.0271Metric Values ➢Classes & Tolerances ➢12-UN3444 7/8 - 12 12-UN4.875120.08334.82090.04510.02084.79920.32°4.77580.0271Metric Values ➢Classes & Tolerances ➢12-UN3495 - 12 12-UN5120.08334.94590.04510.02084.92420.31°4.90080.0271Metric Values ➢Classes & Tolerances ➢12-UN3545 1/8 - 12 12-UN5.125120.08335.07090.04510.02085.04920.3°5.02580.0271Metric Values ➢Classes & Tolerances ➢12-UN3595 1/4 - 12 12-UN5.25120.08335.19590.04510.02085.17420.29°5.15080.0271Metric Values ➢Classes & Tolerances ➢12-UN3645 3/8 - 12 12-UN5.375120.08335.32090.04510.02085.29920.29°5.27580.0271Metric Values ➢Classes & Tolerances ➢12-UN3695 1/2 - 12 12-UN5.5120.08335.44590.04510.02085.42420.28°5.40080.0271Metric Values ➢Classes & Tolerances ➢12-UN3745 5/8 - 12 12-UN5.625120.08335.57090.04510.02085.54920.27°5.52580.0271Metric Values ➢Classes & Tolerances ➢12-UN3795 3/4 - 12 12-UN5.75120.08335.69590.04510.02085.67420.27°5.65080.0271Metric Values ➢Classes & Tolerances ➢12-UN3845 7/8 - 12 12-UN5.875120.08335.82090.04510.02085.79920.26°5.77580.0271Metric Values ➢Classes & Tolerances ➢12-UN3896 - 12 12-UN6120.08335.94590.04510.02085.92420.26°5.90080.0271Metric Values ➢Classes & Tolerances ➢12-UN3943/8 - 16 16-UN0.375160.06250.33440.03380.01560.31813.4°0.30060.0203Metric Values ➢Classes & Tolerances ➢16-UN417/16 - 16 16-UN0.437160.06250.39640.03380.01560.38012.87°0.36260.0203Metric Values ➢Classes & Tolerances ➢16-UN481/2 - 16 16-UN0.5160.06250.45940.03380.01560.44312.48°0.42560.0203Metric Values ➢Classes & Tolerances ➢16-UN559/16 - 16 16-UN0.562160.06250.52140.03380.01560.50512.19°0.48760.0203Metric Values ➢Classes & Tolerances ➢16-UN635/8 - 16 16-UN0.625160.06250.58440.03380.01560.56811.95°0.55060.0203Metric Values ➢Classes & Tolerances ➢16-UN7111/16 - 16 16-UN0.687160.06250.64640.03380.01560.63011.76°0.61260.0203Metric Values ➢Classes & Tolerances ➢16-UN773/4 - 16 16-UN0.75160.06250.70940.03380.01560.69311.61°0.67560.0203Metric Values ➢Classes & Tolerances ➢16-UN8513/16 - 16 16-UN0.812160.06250.77140.03380.01560.75511.48°0.73760.0203Metric Values ➢Classes & Tolerances ➢16-UN917/8 - 16 16-UN0.875160.06250.83440.03380.01560.81811.37°0.80060.0203Metric Values ➢Classes & Tolerances ➢16-UN9915/16 - 16 16-UN0.937160.06250.89640.03380.01560.88011.27°0.86260.0203Metric Values ➢Classes & Tolerances ➢16-UN1051 - 16 16-UN1160.06250.95940.03380.01560.94311.19°0.92560.0203Metric Values ➢Classes & Tolerances ➢16-UN1141 1/16 - 16 16-UN1.062160.06251.02140.03380.01561.00511.12°0.98760.0203Metric Values ➢Classes & Tolerances ➢16-UN1211 1/8 - 16 16-UN1.125160.06251.08440.03380.01561.06811.05°1.05060.0203Metric Values ➢Classes & Tolerances ➢16-UN1291 3/16 - 16 16-UN1.187160.06251.14640.03380.01561.13010.99°1.11260.0203Metric Values ➢Classes & Tolerances ➢16-UN1351 1/4 - 16 16-UN1.25160.06251.20940.03380.01561.19310.94°1.17560.0203Metric Values ➢Classes & Tolerances ➢16-UN1431 5/16 - 16 16-UN1.312160.06251.27140.03380.01561.25510.9°1.23760.0203Metric Values ➢Classes & Tolerances ➢16-UN1491 3/8 - 16 16-UN1.375160.06251.33440.03380.01561.31810.85°1.30060.0203Metric Values ➢Classes & Tolerances ➢16-UN1581 7/16 - 16 16-UN1.437160.06251.39640.03380.01561.38010.82°1.36260.0203Metric Values ➢Classes & Tolerances ➢16-UN1651 1/2 - 16 16-UN1.5160.06251.45940.03380.01561.44310.78°1.42560.0203Metric Values ➢Classes & Tolerances ➢16-UN1741 9/16 - 16 16-UN1.562160.06251.52140.03380.01561.50510.75°1.48760.0203Metric Values ➢Classes & Tolerances ➢16-UN1811 5/8 - 16 16-UN1.625160.06251.58440.03380.01561.56810.72°1.55060.0203Metric Values ➢Classes & Tolerances ➢16-UN1871 11/16 - 16 16-UN1.687160.06251.64640.03380.01561.63010.69°1.61260.0203Metric Values ➢Classes & Tolerances ➢16-UN1931 3/4 - 16 16-UN1.75160.06251.70940.03380.01561.69310.67°1.67560.0203Metric Values ➢Classes & Tolerances ➢16-UN1991 13/16 - 16 16-UN1.812160.06251.77140.03380.01561.75510.64°1.73760.0203Metric Values ➢Classes & Tolerances ➢16-UN2041 7/8 - 16 16-UN1.875160.06251.83440.03380.01561.81810.62°1.80060.0203Metric Values ➢Classes & Tolerances ➢16-UN2091 15/16 - 16 16-UN1.937160.06251.89640.03380.01561.88010.6°1.86260.0203Metric Values ➢Classes & Tolerances ➢16-UN2142 - 16 16-UN2160.06251.95940.03380.01561.94310.58°1.92560.0203Metric Values ➢Classes & Tolerances ➢16-UN2202 1/8 - 16 16-UN2.125160.06252.08440.03380.01562.06810.55°2.05060.0203Metric Values ➢Classes & Tolerances ➢16-UN2252 1/4 - 16 16-UN2.25160.06252.20940.03380.01562.19310.52°2.17560.0203Metric Values ➢Classes & Tolerances ➢16-UN2312 3/8 - 16 16-UN2.375160.06252.33440.03380.01562.31810.49°2.30060.0203Metric Values ➢Classes & Tolerances ➢16-UN2362 1/2 - 16 16-UN2.5160.06252.45940.03380.01562.44310.46°2.42560.0203Metric Values ➢Classes & Tolerances ➢16-UN2432 5/8 - 16 16-UN2.625160.06252.58440.03380.01562.56810.44°2.55060.0203Metric Values ➢Classes & Tolerances ➢16-UN2492 3/4 - 16 16-UN2.75160.06252.70940.03380.01562.69310.42°2.67560.0203Metric Values ➢Classes & Tolerances ➢16-UN2562 7/8 - 16 16-UN2.875160.06252.83440.03380.01562.81810.4°2.80060.0203Metric Values ➢Classes & Tolerances ➢16-UN2623 - 16 16-UN3160.06252.95940.03380.01562.94310.39°2.92560.0203Metric Values ➢Classes & Tolerances ➢16-UN2693 1/8 - 16 16-UN3.125160.06253.08440.03380.01563.06810.37°3.05060.0203Metric Values ➢Classes & Tolerances ➢16-UN2753 1/4 - 16 16-UN3.25160.06253.20940.03380.01563.19310.36°3.17560.0203Metric Values ➢Classes & Tolerances ➢16-UN2813 3/8 - 16 16-UN3.375160.06253.33440.03380.01563.31810.34°3.30060.0203Metric Values ➢Classes & Tolerances ➢16-UN2863 1/2 - 16 16-UN3.5160.06253.45940.03380.01563.44310.33°3.42560.0203Metric Values ➢Classes & Tolerances ➢16-UN2923 5/8 - 16 16-UN3.625160.06253.58440.03380.01563.56810.32°3.55060.0203Metric Values ➢Classes & Tolerances ➢16-UN2973 3/4 - 16 16-UN3.75160.06253.70940.03380.01563.69310.31°3.67560.0203Metric Values ➢Classes & Tolerances ➢16-UN3033 7/8 - 16 16-UN3.875160.06253.83440.03380.01563.81810.3°3.80060.0203Metric Values ➢Classes & Tolerances ➢16-UN3084 - 16 16-UN4160.06253.95940.03380.01563.94310.29°3.92560.0203Metric Values ➢Classes & Tolerances ➢16-UN3144 1/8 - 16 16-UN4.125160.06254.08440.03380.01564.06810.28°4.05060.0203Metric Values ➢Classes & Tolerances ➢16-UN3194 1/4 - 16 16-UN4.25160.06254.20940.03380.01564.19310.27°4.17560.0203Metric Values ➢Classes & Tolerances ➢16-UN3244 3/8 - 16 16-UN4.375160.06254.33440.03380.01564.31810.26°4.30060.0203Metric Values ➢Classes & Tolerances ➢16-UN3294 1/2 - 16 16-UN4.5160.06254.45940.03380.01564.44310.26°4.42560.0203Metric Values ➢Classes & Tolerances ➢16-UN3344 5/8 - 16 16-UN4.625160.06254.58440.03380.01564.56810.25°4.55060.0203Metric Values ➢Classes & Tolerances ➢16-UN3394 3/4 - 16 16-UN4.75160.06254.70940.03380.01564.69310.24°4.67560.0203Metric Values ➢Classes & Tolerances ➢16-UN3454 7/8 - 16 16-UN4.875160.06254.83440.03380.01564.81810.24°4.80060.0203Metric Values ➢Classes & Tolerances ➢16-UN3505 - 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4 4-UN5.62540.25005.46260.13530.06255.39750.83°5.32730.0812Metric Values ➢Classes & Tolerances ➢4-UN3765 3/4 - 4 4-UN5.7540.25005.58760.13530.06255.52250.82°5.45230.0812Metric Values ➢Classes & Tolerances ➢4-UN3815 7/8 - 4 4-UN5.87540.25005.71260.13530.06255.64750.8°5.57730.0812Metric Values ➢Classes & Tolerances ➢4-UN3866 - 4 4-UN640.25005.83760.13530.06255.77250.78°5.70230.0812Metric Values ➢Classes & Tolerances ➢4-UN3911 3/8 - 6 6-UN1.37560.16671.26670.09020.04171.22332.4°1.17650.0541Metric Values ➢Classes & Tolerances ➢6-UN1551 7/16 - 6 6-UN1.43760.16671.32870.09020.04171.28532.29°1.23850.0541Metric Values ➢Classes & Tolerances ➢6-UN1621 1/2 - 6 6-UN1.560.16671.39170.09020.04171.34832.18°1.30150.0541Metric Values ➢Classes & Tolerances ➢6-UN1711 9/16 - 6 6-UN1.56260.16671.45370.09020.04171.41032.09°1.36350.0541Metric Values ➢Classes & Tolerances ➢6-UN1781 5/8 - 6 6-UN1.62560.16671.51670.09020.04171.47332°1.42650.0541Metric Values ➢Classes & Tolerances ➢6-UN1841 11/16 - 6 6-UN1.68760.16671.57870.09020.04171.53531.92°1.48850.0541Metric Values ➢Classes & Tolerances ➢6-UN1901 3/4 - 6 6-UN1.7560.16671.64170.09020.04171.59831.85°1.55150.0541Metric Values ➢Classes & Tolerances ➢6-UN1961 13/16 - 6 6-UN1.81260.16671.70370.09020.04171.66031.78°1.61350.0541Metric Values ➢Classes & Tolerances ➢6-UN2011 7/8 - 6 6-UN1.87560.16671.76670.09020.04171.72331.72°1.67650.0541Metric Values ➢Classes & Tolerances ➢6-UN2061 15/16 - 6 6-UN1.93760.16671.82870.09020.04171.78531.66°1.73850.0541Metric Values ➢Classes & Tolerances ➢6-UN2112 - 6 6-UN260.16671.89170.09020.04171.84831.61°1.80150.0541Metric Values ➢Classes & Tolerances ➢6-UN2172 1/8 - 6 6-UN2.12560.16672.01670.09020.04171.97331.51°1.92650.0541Metric Values ➢Classes & Tolerances ➢6-UN2222 1/4 - 6 6-UN2.2560.16672.14170.09020.04172.09831.42°2.05150.0541Metric Values ➢Classes & Tolerances ➢6-UN2282 3/8 - 6 6-UN2.37560.16672.26670.09020.04172.22331.34°2.17650.0541Metric Values ➢Classes & Tolerances ➢6-UN2332 1/2 - 6 6-UN2.560.16672.39170.09020.04172.34831.27°2.30150.0541Metric Values ➢Classes & Tolerances ➢6-UN2402 5/8 - 6 6-UN2.62560.16672.51670.09020.04172.47331.21°2.42650.0541Metric Values ➢Classes & Tolerances ➢6-UN2462 3/4 - 6 6-UN2.7560.16672.64170.09020.04172.59831.15°2.55150.0541Metric Values ➢Classes & Tolerances ➢6-UN2532 7/8 - 6 6-UN2.87560.16672.76670.09020.04172.72331.1°2.67650.0541Metric Values ➢Classes & Tolerances ➢6-UN2593 - 6 6-UN360.16672.89170.09020.04172.84831.05°2.80150.0541Metric Values ➢Classes & Tolerances ➢6-UN2663 1/8 - 6 6-UN3.12560.16673.01670.09020.04172.97331.01°2.92650.0541Metric Values ➢Classes & Tolerances ➢6-UN2723 1/4 - 6 6-UN3.2560.16673.14170.09020.04173.09830.97°3.05150.0541Metric Values ➢Classes & Tolerances ➢6-UN2783 3/8 - 6 6-UN3.37560.16673.26670.09020.04173.22330.93°3.17650.0541Metric Values ➢Classes & Tolerances ➢6-UN2833 1/2 - 6 6-UN3.560.16673.39170.09020.04173.34830.9°3.30150.0541Metric Values ➢Classes & Tolerances ➢6-UN2893 5/8 - 6 6-UN3.62560.16673.51670.09020.04173.47330.86°3.42650.0541Metric Values ➢Classes & Tolerances ➢6-UN2943 3/4 - 6 6-UN3.7560.16673.64170.09020.04173.59830.83°3.55150.0541Metric Values ➢Classes & Tolerances ➢6-UN3003 7/8 - 6 6-UN3.87560.16673.76670.09020.04173.72330.81°3.67650.0541Metric Values ➢Classes & Tolerances ➢6-UN3054 - 6 6-UN460.16673.89170.09020.04173.84830.78°3.80150.0541Metric Values ➢Classes & Tolerances ➢6-UN3114 1/8 - 6 6-UN4.12560.16674.01670.09020.04173.97330.76°3.92650.0541Metric Values ➢Classes & Tolerances ➢6-UN3164 1/4 - 6 6-UN4.2560.16674.14170.09020.04174.09830.73°4.05150.0541Metric Values ➢Classes & Tolerances ➢6-UN3214 3/8 - 6 6-UN4.37560.16674.26670.09020.04174.22330.71°4.17650.0541Metric Values ➢Classes & Tolerances ➢6-UN3264 1/2 - 6 6-UN4.560.16674.39170.09020.04174.34830.69°4.30150.0541Metric Values ➢Classes & Tolerances ➢6-UN3314 5/8 - 6 6-UN4.62560.16674.51670.09020.04174.47330.67°4.42650.0541Metric Values ➢Classes & Tolerances ➢6-UN3364 3/4 - 6 6-UN4.7560.16674.64170.09020.04174.59830.65°4.55150.0541Metric Values ➢Classes & Tolerances ➢6-UN3424 7/8 - 6 6-UN4.87560.16674.76670.09020.04174.72330.64°4.67650.0541Metric Values ➢Classes & Tolerances ➢6-UN3475 - 6 6-UN560.16674.89170.09020.04174.84830.62°4.80150.0541Metric Values ➢Classes & Tolerances ➢6-UN3525 1/8 - 6 6-UN5.12560.16675.01670.09020.04174.97330.61°4.92650.0541Metric Values ➢Classes & Tolerances ➢6-UN3575 1/4 - 6 6-UN5.2560.16675.14170.09020.04175.09830.59°5.05150.0541Metric Values ➢Classes & Tolerances ➢6-UN3625 3/8 - 6 6-UN5.37560.16675.26670.09020.04175.22330.58°5.17650.0541Metric Values ➢Classes & Tolerances ➢6-UN3675 1/2 - 6 6-UN5.560.16675.39170.09020.04175.34830.56°5.30150.0541Metric Values ➢Classes & Tolerances ➢6-UN3725 5/8 - 6 6-UN5.62560.16675.51670.09020.04175.47330.55°5.42650.0541Metric Values ➢Classes & Tolerances ➢6-UN3775 3/4 - 6 6-UN5.7560.16675.64170.09020.04175.59830.54°5.55150.0541Metric Values ➢Classes & Tolerances ➢6-UN3825 7/8 - 6 6-UN5.87560.16675.76670.09020.04175.72330.53°5.67650.0541Metric Values ➢Classes & Tolerances ➢6-UN3876 - 6 6-UN660.16675.89170.09020.04175.84830.52°5.80150.0541Metric Values ➢Classes & Tolerances ➢6-UN3921 - 8 8-UN180.12500.91880.06770.03130.88632.48°0.85120.0406Metric Values ➢Classes & Tolerances ➢8-UN1121 1/16 - 8 8-UN1.06280.12500.98080.06770.03130.94832.32°0.91320.0406Metric Values ➢Classes & Tolerances ➢8-UN1191 1/8 - 8 8-UN1.12580.12501.04380.06770.03131.01132.18°0.97620.0406Metric Values ➢Classes & Tolerances ➢8-UN1271 3/16 - 8 8-UN1.18780.12501.10580.06770.03131.07332.06°1.03820.0406Metric Values ➢Classes & Tolerances ➢8-UN1331 1/4 - 8 8-UN1.2580.12501.16880.06770.03131.13631.95°1.10120.0406Metric Values ➢Classes & Tolerances ➢8-UN1411 5/16 - 8 8-UN1.31280.12501.23080.06770.03131.19831.85°1.16320.0406Metric Values ➢Classes & Tolerances ➢8-UN1471 3/8 - 8 8-UN1.37580.12501.29380.06770.03131.26131.76°1.22620.0406Metric Values ➢Classes & Tolerances ➢8-UN1561 7/16 - 8 8-UN1.43780.12501.35580.06770.03131.32331.68°1.28820.0406Metric Values ➢Classes & Tolerances ➢8-UN1631 1/2 - 8 8-UN1.580.12501.41880.06770.03131.38631.61°1.35120.0406Metric Values ➢Classes & Tolerances ➢8-UN1721 9/16 - 8 8-UN1.56280.12501.48080.06770.03131.44831.54°1.41320.0406Metric Values ➢Classes & Tolerances ➢8-UN1791 5/8 - 8 8-UN1.62580.12501.54380.06770.03131.51131.48°1.47620.0406Metric Values ➢Classes & Tolerances ➢8-UN1851 11/16 - 8 8-UN1.68780.12501.60580.06770.03131.57331.42°1.53820.0406Metric Values ➢Classes & Tolerances ➢8-UN1911 3/4 - 8 8-UN1.7580.12501.66880.06770.03131.63631.37°1.60120.0406Metric Values ➢Classes & Tolerances ➢8-UN1971 13/16 - 8 8-UN1.81280.12501.73080.06770.03131.69831.32°1.66320.0406Metric Values ➢Classes & Tolerances ➢8-UN2021 7/8 - 8 8-UN1.87580.12501.79380.06770.03131.76131.27°1.72620.0406Metric Values ➢Classes & Tolerances ➢8-UN2071 15/16 - 8 8-UN1.93780.12501.85580.06770.03131.82331.23°1.78820.0406Metric Values ➢Classes & Tolerances ➢8-UN2122 - 8 8-UN280.12501.91880.06770.03131.88631.19°1.85120.0406Metric Values ➢Classes & Tolerances ➢8-UN2182 1/8 - 8 8-UN2.12580.12502.04380.06770.03132.01131.12°1.97620.0406Metric Values ➢Classes & Tolerances ➢8-UN2232 1/4 - 8 8-UN2.2580.12502.16880.06770.03132.13631.05°2.10120.0406Metric Values ➢Classes & Tolerances ➢8-UN2292 3/8 - 8 8-UN2.37580.12502.29380.06770.03132.26130.99°2.22620.0406Metric Values ➢Classes & Tolerances ➢8-UN2342 1/2 - 8 8-UN2.580.12502.41880.06770.03132.38630.94°2.35120.0406Metric Values ➢Classes & Tolerances ➢8-UN2412 5/8 - 8 8-UN2.62580.12502.54380.06770.03132.51130.9°2.47620.0406Metric Values ➢Classes & Tolerances ➢8-UN2472 3/4 - 8 8-UN2.7580.12502.66880.06770.03132.63630.85°2.60120.0406Metric Values ➢Classes & Tolerances ➢8-UN2542 7/8 - 8 8-UN2.87580.12502.79380.06770.03132.76130.82°2.72620.0406Metric Values ➢Classes & Tolerances ➢8-UN2603 - 8 8-UN380.12502.91880.06770.03132.88630.78°2.85120.0406Metric Values ➢Classes & Tolerances ➢8-UN2673 1/8 - 8 8-UN3.12580.12503.04380.06770.03133.01130.75°2.97620.0406Metric Values ➢Classes & Tolerances ➢8-UN2733 1/4 - 8 8-UN3.2580.12503.16880.06770.03133.13630.72°3.10120.0406Metric Values ➢Classes & Tolerances ➢8-UN2793 3/8 - 8 8-UN3.37580.12503.29380.06770.03133.26130.69°3.22620.0406Metric Values ➢Classes & Tolerances ➢8-UN2843 1/2 - 8 8-UN3.580.12503.41880.06770.03133.38630.67°3.35120.0406Metric Values ➢Classes & Tolerances ➢8-UN2903 5/8 - 8 8-UN3.62580.12503.54380.06770.03133.51130.64°3.47620.0406Metric Values ➢Classes & Tolerances ➢8-UN2953 3/4 - 8 8-UN3.7580.12503.66880.06770.03133.63630.62°3.60120.0406Metric Values ➢Classes & Tolerances ➢8-UN3013 7/8 - 8 8-UN3.87580.12503.79380.06770.03133.76130.6°3.72620.0406Metric Values ➢Classes & Tolerances ➢8-UN3064 - 8 8-UN480.12503.91880.06770.03133.88630.58°3.85120.0406Metric Values ➢Classes & Tolerances ➢8-UN3124 1/8 - 8 8-UN4.12580.12504.04380.06770.03134.01130.56°3.97620.0406Metric Values ➢Classes & Tolerances ➢8-UN3174 1/4 - 8 8-UN4.2580.12504.16880.06770.03134.13630.55°4.10120.0406Metric Values ➢Classes & Tolerances ➢8-UN3224 3/8 - 8 8-UN4.37580.12504.29380.06770.03134.26130.53°4.22620.0406Metric Values ➢Classes & Tolerances ➢8-UN3274 1/2 - 8 8-UN4.580.12504.41880.06770.03134.38630.52°4.35120.0406Metric Values ➢Classes & Tolerances ➢8-UN3324 5/8 - 8 8-UN4.62580.12504.54380.06770.03134.51130.5°4.47620.0406Metric Values ➢Classes & Tolerances ➢8-UN3374 3/4 - 8 8-UN4.7580.12504.66880.06770.03134.63630.49°4.60120.0406Metric Values ➢Classes & Tolerances ➢8-UN3434 7/8 - 8 8-UN4.87580.12504.79380.06770.03134.76130.48°4.72620.0406Metric Values ➢Classes & Tolerances ➢8-UN3485 - 8 8-UN580.12504.91880.06770.03134.88630.46°4.85120.0406Metric Values ➢Classes & Tolerances ➢8-UN3535 1/8 - 8 8-UN5.12580.12505.04380.06770.03135.01130.45°4.97620.0406Metric Values ➢Classes & Tolerances ➢8-UN3585 1/4 - 8 8-UN5.2580.12505.16880.06770.03135.13630.44°5.10120.0406Metric Values ➢Classes & Tolerances ➢8-UN3635 3/8 - 8 8-UN5.37580.12505.29380.06770.03135.26130.43°5.22620.0406Metric Values ➢Classes & Tolerances ➢8-UN3685 1/2 - 8 8-UN5.580.12505.41880.06770.03135.38630.42°5.35120.0406Metric Values ➢Classes & Tolerances ➢8-UN3735 5/8 - 8 8-UN5.62580.12505.54380.06770.03135.51130.41°5.47620.0406Metric Values ➢Classes & Tolerances ➢8-UN3785 3/4 - 8 8-UN5.7580.12505.66880.06770.03135.63630.4°5.60120.0406Metric Values ➢Classes & Tolerances ➢8-UN3835 7/8 - 8 8-UN5.87580.12505.79380.06770.03135.76130.39°5.72620.0406Metric Values ➢Classes & Tolerances ➢8-UN3886 - 8 8-UN680.12505.91880.06770.03135.88630.39°5.85120.0406Metric Values ➢Classes & Tolerances ➢8-UN393limits of Thread Dimensions (UNC, UNF & UNEF)To manufacture or measure a thread, one has to know the maximum and minimum permissible values of the basic dimensions. These values are calculated according to the thread class (See below). To understand classes, you first need to understand the terms Allowance (Sometimes referred to as deviation) and Tolerances.Definition of terms:Allowance (Deviation): The minimum permissible distance between the basic and actual profile.Tolerance: The width of the tolerance field of a diameter on the actual thread profile. (Pitch, Major & Minor diameters)A small allowance means that the assembly of a male and female thread will be harder, but after assembly, there will be less freedom of movement.A large allowance means that the assembly of a male and female thread will be easier, but after assembly, there will be more freedom of movement.The allowance size does not influence a thread’s production difficulty or price.A wide tolerance is easier and cheaper to produce but yields a larger spread between threads.A narrow tolerance is challenging to produce and more expensive but yields a smaller spread between threads.Unified Thread ClassesThe class is defined by a two-character code.The first character defines is a digit between 1 and 3. 1=Loose fit, 2=Medium fit, and 3=Tight fit.The second character is a letter. A=External thread and B=Internal thread.In the Unified Inch thread system, only classes 1A & 2A have an allowance. The allowance for the two classes is the same.The other 4 classes have an allowance of Zero.All the internal thread profiles (B classes) have no allowance.Classes 1A & 1B: These classes are suitable for applications where a liberal tolerance and allowance are required to permit easy assembly. The maximum diameters of Class 1A threads are smaller than the basic diameter by the allowance amount. The minimum diameters of Class 1B threads are equal to the basic diameters and consequently afford no allowance at maximum material condition.Classes 2A & 2B: Classes 2A (external) and 2B (internal) are the default classes used for the commercial production of Nut, Bols, and otehr threaded fasteners. They are the default class unless otherwise specified. they have the same allowance as classes 1A/1B. However, they have a narrower tolerance field. The difficulty of assembly is the same, but the spread between different parts in a production batch is smaller.Classes 3A & 3B: These classes are suitable for applications where tight fit and accuracy of thread elements are essential. The maximum diameters of Class 3A threads and the minimum diameters of Class 3B threads are the same (Both have zero allowance). The accuracy is high, but the assembly is difficult.Combinations of Classes: The engineer can select any valid class for the male and female threads to achieve his design goals. The valid classes are defined in ASTM B1.1 as follows:Classes 2A, 2A, 3B, and 3B are always valid.Classes 1A & 1B are valid only for UNC threads with a nominal diameter equal to or larger than 1/4″.Unified Thread Allowance.The allowance es should be calculated for external threads with classes 1A and 2A. The allowance of both classes is the same and equals 0.3 times the pitch diameter tolerance of class 2A. It is the function of 3 parameters.D – Basic (nominal diameter)P – Pitch (1/TPI)LE – Length of engagement. If not explicitly specified, the length of engagement is assumed to be 5 pitches. (LE=5*P)All parameters are in inches$ \large es = 0.3 \times \left [ 0.0015 \times \sqrt[3]{D} + 0.0015 \times \sqrt{LE} + 0.015 \times \sqrt[3]{P^{2}} \right ] $\begin{array} \large \,es& = 0.3 \times\,[\,0.0015 \times \sqrt[3]{D} &\\ & +\,0.0015 \times \sqrt{LE}&\\ & + 0.015 \times \sqrt[3]{P^{2}}\,] \end{array}The result should be rounded to 6 decimal places.ASTM B1.1 lists in a long chart the allowance for each thread size. However, the results of this formula are 100% accurate, and there is no need to browse the chart.You can use our Advanced Threading Calculator to obtain the allowance according to a thread description or use the mini-calculator below.Unified Thread Allowance CalculatorPayment options Unified Thread TolerancesThe tolerances TD for internal threads and Td for external threads are derived from the class. The tolerances can be calculated according to the below formulas.Td – Tolerance for External Major DiameterTd2 – Tolerance for External Pitch DiameterTD1 – Tolerance for Internal Minor DiameterTD2 – Tolerance for Internal Pitch DiameterT – Base Tolerance (The tolerance of CLASS 2A pitch diameter is the base tolerance from which other tolerances are derived)D – Basic thread diameter.P – Pitch (1/TPI).LE – Length of engagement. (If unknown, the default is 5 * P)All input parameters and results are in Inches.Base Tolerance Formula$ \large T = 0.0015 \times \sqrt[3]{D} + 0.0015 \times \sqrt{LE} + 0.015 \times \sqrt[3]{P^{2}}$\begin{array} \large \,T& = \,0.0015 \times \sqrt[3]{D} &\\ & +\,0.0015 \times \sqrt{LE}&\\ & + 0.015 \times \sqrt[3]{P^{2}} \end{array}Formulas for External thread(Classes 1A,2A & 3A)$ \large T_{d(1A)} = 0.3 \times T $$ \large T_{d2(1A)} = 1.5 \times T $$ \large T_{d(2A)} = 0.06 \times \sqrt[3]{P^2} $$ \large T_{d2(2A)} = T $$ \large T_{d(3A)} = 0.06 \times \sqrt[3]{P^2} $$ \large T_{d2(3A)} = 0.75 \times T $Formulas for Internal Thread(Classes 1B,2B & 3B)$ \large T_{d1(1B)} = 0.25 \times P\,-\,0.4 \times P^{2} $$ \large T_{d2(1B)} = 1.95 \times T $$ \large T_{d1(2B)} = 0.25 \times P\,-\,0.4 \times P^{2} $$ \large T_{d2(2B)} = 1.30 \times T $$\begin{array}{ll} \large T_{d1(3B)}=&0.05 \times \sqrt[3]{P} + &\\ &0.003 \times \frac{P}{D}\,-\,0.002 \end{array} $$ \large T_{d2(3B)} = 0.975 \times T $The above formulas can be used in most cases. However, ASTM B1.1 lists various scenarios where other formulas or quirky rounding rules apply. Use our Advanced Threading Calculator to get exact results for any thread.Usage notes for the above formulas:The result should be rounded to 6 decimal places.Formulas for external threads are valid for all threads.Formulas for internal threads are valid only for thread diameters above 1/4″, a pitch between 4 and 80 TPI, and engagement lengths up to 1.5 X D.In some cases, ASTM B1.1 dictates special rounding rules.You can use the Threading Calculator, which automatically considers all the above rules.Unified Thread limits CalculationsOnce the Td, TD, & es values are known, the final limits can be calculated according to the formulas below.Formulas for Limits of a Unified Inch External Thread$ \large d_{max}=d-{es} $$ \large d_{min}=d_{max}-T_d $$ \large d_{2max} = d2 – es $$ \large d_{2min}=d_{2max}-T_{d2} $Formulas for Limits of a Unified Inch InternalThread$ \large D_{1min}=D $$ \large D_{1max}=D_{1min}+T_{D1} $$ \large D_{2minx} = D_2 $$ \large D_{2max}=D_{2min}+ T_{D2} $Related Glossary Terms:PitchThread Allowance (es)Major DiameterTooth per inch (tpi)Lead (Threading)Minor DiameterPitch DiameterFundamental TriangleThread Height (Depth)Thread addendumTap Drill SizeMaximum material condition (MMC)Length of Engagement

Metricthread calculator

-UN – Unified Inch Constant PitchThread SeriesClick to get the Full Thread Data-Sheet for a specific combinationPossible Combinations for 1/16″ – 1/4″DiameterTPI=8072645648444036322824200.06UNF0.073UNFUNC0.086UNFUNC0.099UNFUNC0.112UNFUNC0.125UNFUNC0.138UNFUNC0.164UNFUNC0.19UNFUNC0.216UNEFUNFUNC0.25UNEFUNFUNCPossible Combinations for 5/16″ – 1 1/2″DiameterTPI=322824201816141312111098765/16UNEF28-UNUNF20-UNUNC3/8UNEF28-UNUNF20-UNUNC7/1632-UNUNEFUNF16-UNUNC1/232-UNUNEFUNF16-UNUNC9/1632-UN28-UNUNEF20-UNUNF16-UNUNC5/832-UN28-UNUNEF20-UNUNF16-UN12-UNUNC11/1632-UN28-UNUNEF20-UN16-UN12-UN3/432-UN28-UNUNEFUNF12-UNUNC13/1632-UN28-UNUNEF16-UN12-UN7/832-UN28-UNUNEF16-UNUNF12-UNUNC15/1632-UN28-UNUNEF16-UN12-UN132-UN28-UNUNEF16-UNUNFUNC1 1/1628-UN20-UNUNEF16-UN12-UN8-UN1 1/828-UN20-UNUNEF16-UNUNF8-UNUNC1 3/1628-UN20-UNUNEF16-UN12-UN8-UN1 1/428-UN20-UNUNEF16-UNUNF8-UNUNC1 5/1628-UN20-UNUNEF16-UN12-UN8-UN1 3/828-UN20-UNUNEF16-UNUNF8-UNUNC1 7/1628-UN20-UNUNEF16-UN12-UN8-UN6-UN1 1/228-UN20-UNUNEF16-UNUNF8-UNUNCPossible Combinations for 1 9/16″ – 6″DiameterTPI=2018161413121110987654.541 9/1620-UNUNEF16-UN12-UN8-UN6-UN1 5/820-UNUNEF16-UN12-UN8-UN6-UN1 11/1620-UNUNEF16-UN12-UN8-UN6-UN1 3/420-UN16-UN12-UN8-UN6-UNUNC1 13/1620-UN16-UN12-UN8-UN6-UN1 7/820-UN16-UN12-UN8-UN6-UN1 15/1620-UN16-UN12-UN8-UN6-UN220-UN16-UN12-UN8-UN6-UNUNC2 1/820-UN16-UN12-UN8-UN6-UN2 1/420-UN16-UN12-UN8-UN6-UNUNC2 3/820-UN16-UN12-UN8-UN6-UN2 1/220-UN16-UN12-UN8-UN6-UNUNC2 5/820-UN16-UN12-UN8-UN6-UN4-UN2 3/420-UN16-UN12-UN8-UN6-UNUNC2 7/820-UN16-UN12-UN8-UN6-UN4-UN320-UN16-UN12-UN8-UN6-UNUNC3 1/816-UN12-UN8-UN6-UN4-UN3 1/416-UN12-UN8-UN6-UNUNC3 3/816-UN12-UN8-UN6-UN4-UN3 1/216-UN12-UN8-UN6-UNUNC3 5/816-UN12-UN8-UN6-UN4-UN3 3/416-UN12-UN8-UN6-UNUNC3 7/816-UN12-UN8-UN6-UN4-UN416-UN12-UN8-UN6-UNUNC4 1/816-UN12-UN8-UN6-UN4-UN4 1/416-UN12-UN8-UN6-UN4-UN4 3/816-UN12-UN8-UN6-UN4-UN4 1/216-UN12-UN8-UN6-UN4-UN4 5/820-UN16-UN12-UN8-UN6-UN4-UN4 3/416-UN12-UN8-UN6-UN4-UN4 7/816-UN12-UN8-UN6-UN4-UN516-UN12-UN8-UN6-UN4-UN5 1/816-UN12-UN8-UN6-UN4-UN5 1/416-UN12-UN8-UN6-UN4-UN5 3/816-UN12-UN8-UN6-UN4-UN5 1/216-UN12-UN8-UN6-UN4-UN5 5/816-UN12-UN8-UN6-UN4-UN5 3/416-UN12-UN8-UN6-UN4-UN5 7/816-UN12-UN8-UN6-UN4-UN616-UN12-UN8-UN6-UN4-UNBasic Thread Dimensions (UNC, UNF & UNEF)The basic dimensions are nominal dimensions of a unified thread profile without allowance and tolerances (The thread class defines that). They are based on standard ASTM B1.1. The basic dimensions can be used for design. However, for manufacturing and machining, you need the allowable range of each dimension. This data can be found in the standard or in the Limits and Dimensions section below. All the basic dimensions are derived from simple formulas based on the thread’s nominal diameter and pitch.SymbolsList of symbols used in charts and formulas of Unified Inch ThreadsSymbolExplanationBasic Parameters - Diameters and PitchDMajor (Basic) diameter of internal threadD1Minor Diameter - Internal ThreadD2Pitch Diameter - Internal ThreadD3Major diameter, rounded root, internal threaddMajor (Basic) diameter of external threadd1Minor Diameter - External Threadd2Pitch Diameter - External Threadd3MMajor diameter, rounded root, internal threadnNumber of threds per Inch (TPI)PPitch (Distance)LLeadHeight ParametersHHeight of fundamental trianglehsThread Height - External ThreadhasThread addendum - External ThreadhnThread Height - Internal ThreadhanThread addendum - Internal ThreadLength ParametersLELength of EngagmentLtsLength - External ThreadLtnLength- Internal ThreadAllowance, Deviation, and TolerancesTD1Tolerance - D1TD2Tolerance - D2TdTolerance - dTd2Tolerance - d2esAllowance - External ThreadCrest / Root ParametersFcsCrest width - External ThreadFrsRoot width - External ThreadFcsCrest width - Internal ThreadFcsRoot width - Internal ThreadFormulas for basic dimensionsExternal Thread$ \large d=\text{Basic Diameter} $$ \large P=\frac{1}{TPI} $$ \large H=\frac{\sqrt{3}}{2}\times{P} = 0.866025404\times{P} $$ \large h_s=\frac{5}{8}\times{H} $$ \large h_{as}=\frac{3}{8}\times{H}$$ \large d_2=d-{2}\times{h_{as}} $$ \large d_1=d-{2}\times{h_s}$$ \large F_{cs}=\frac{P}{8}$$ \large F_{rs}=\frac{P}{4}$internal thread$ \large D=\text{Basic Diameter} $$ \large P=\frac{1}{TPI} $$ \large H=\frac{\sqrt{3}}{2}\times{P} = 0.866025404\times{P} $$ \large h_n=\frac{5}{8}\times{H} $$ \large h_{an}=\frac{1}{4}\times{H}$$ \large D_1=D-{2}\times{h_n}$$ \large D_2=D1+{2}\times{h_{an}}$$ \large F_{rn}=\frac{P}{8}$$ \large F_{cn}=\frac{P}{4}$Unified Inch Threads Dimensions ChartsUNC Series Basic Dimensions chartClick the Thread Link to get the Full Thread Data for all classesAll dimensions are in inches. To view the Metric translation, click the Thread LinkClick icon to show Additional columnsClick icon to show Full Thread DataThreadBasic DiamTPIPitchPitch DiamThread HeightCres/ RootTap Drill SizeLead AngleMinor DiameterThread addendumseriesid#1 - 64 UNC0.073640.01560.06290.00850.00390.05884.52°0.05440.0051Metric Values ➢Classes & Tolerances ➢UNC2#2 - 56 UNC0.086560.01790.07440.00970.00450.06984.37°0.06470.0058Metric Values ➢Classes & Tolerances ➢UNC4#3 - 48 UNC0.099480.02080.08550.01130.00520.084.44°0.07420.0068Metric Values ➢Classes & Tolerances ➢UNC6#4 - 40 UNC0.112400.02500.09580.01350.00630.08934.75°0.08220.0081Metric Values ➢Classes & Tolerances ➢UNC8#5 - 40 UNC0.125400.02500.10880.01350.00630.10234.18°0.09520.0081Metric Values ➢Classes & Tolerances ➢UNC10#6 - 32 UNC0.138320.03130.11770.01690.00780.10964.83°0.10080.0101Metric Values ➢Classes & Tolerances ➢UNC12#8 - 32 UNC0.164320.03130.14370.01690.00780.13563.96°0.12680.0101Metric Values ➢Classes & Tolerances ➢UNC15#10 - 24 UNC0.19240.04170.16290.02260.01040.15214.65°0.14040.0135Metric Values ➢Classes & Tolerances ➢UNC18#12 - 24 UNC0.216240.04170.18890.02260.01040.17814.02°0.16640.0135Metric Values ➢Classes & Tolerances ➢UNC211/4 - 20 UNC0.25200.05000.21750.02710.01250.20454.18°0.19050.0162Metric Values ➢Classes & Tolerances ➢UNC265/16 - 18 UNC0.312180.05560.27590.03010.01390.26143.67°0.24580.018Metric Values ➢Classes & Tolerances ➢UNC323/8 - 16 UNC0.375160.06250.33440.03380.01560.31813.4°0.30060.0203Metric Values ➢Classes & Tolerances ➢UNC387/16 - 14 UNC0.437140.07140.39060.03870.01790.3723.33°0.35190.0232Metric Values ➢Classes & Tolerances ➢UNC451/2 - 13 UNC0.5130.07690.450.04160.01920.433.11°0.40840.025Metric Values ➢Classes & Tolerances ➢UNC529/16 - 12 UNC0.562120.08330.50790.04510.02080.48622.99°0.46280.0271Metric Values ➢Classes & Tolerances ➢UNC595/8 - 11 UNC0.625110.09090.5660.04920.02270.54232.93°0.51670.0295Metric Values ➢Classes & Tolerances ➢UNC673/4 - 10 UNC0.75100.10000.6850.05410.0250.6592.66°0.63090.0325Metric Values ➢Classes & Tolerances ➢UNC817/8 - 9 UNC0.87590.11110.80280.06010.02780.77392.52°0.74270.0361Metric Values ➢Classes & Tolerances ➢UNC951 - 8 UNC180.12500.91880.06770.03130.88632.48°0.85120.0406Metric Values ➢Classes & Tolerances ➢UNC1091 1/8 - 7 UNC1.12570.14291.03220.07730.03570.9952.52°0.95490.0464Metric Values ➢Classes & Tolerances ➢UNC1241 1/4 - 7 UNC1.2570.14291.15720.07730.03571.122.25°1.07990.0464Metric Values ➢Classes & Tolerances ➢UNC1381 3/8 - 6 UNC1.37560.16671.26670.09020.04171.22332.4°1.17650.0541Metric Values ➢Classes & Tolerances ➢UNC1521 1/2 - 6 UNC1.560.16671.39170.09020.04171.34832.18°1.30150.0541Metric Values ➢Classes & Tolerances ➢UNC1681 3/4 - 5 UNC1.7550.20001.62010.10830.051.5682.25°1.51180.065Metric Values ➢Classes & Tolerances ➢UNC1952 - 4.5 UNC240.22221.85570.12030.05561.79782.18°1.73540.0722Metric Values ➢Classes & Tolerances ➢UNC2162 1/4 - 4.5 UNC2.2540.22222.10570.12030.05562.04781.92°1.98540.0722Metric Values ➢Classes & Tolerances ➢UNC2272 1/2 - 4 UNC2.540.25002.33760.13530.06252.27251.95°2.20230.0812Metric Values ➢Classes & Tolerances ➢UNC2382 3/4 - 4 UNC2.7540.25002.58760.13530.06252.52251.76°2.45230.0812Metric Values ➢Classes & Tolerances ➢UNC2513 - 4 UNC340.25002.83760.13530.06252.77251.61°2.70230.0812Metric Values ➢Classes & Tolerances ➢UNC2643 1/4 - 4 UNC3.2540.25003.08760.13530.06253.02251.48°2.95230.0812Metric Values ➢Classes & Tolerances ➢UNC2763 1/2 - 4 UNC3.540.25003.33760.13530.06253.27251.37°3.20230.0812Metric Values ➢Classes & Tolerances ➢UNC2873 3/4 - 4 UNC3.7540.25003.58760.13530.06253.52251.27°3.45230.0812Metric Values ➢Classes & Tolerances ➢UNC2984 - 4 UNC440.25003.83760.13530.06253.77251.19°3.70230.0812Metric Values ➢Classes & Tolerances ➢UNC309UNF Series Basic Dimensions chartClick the Thread Link to get the Full Thread Data for all classesAll dimensions are in inches. To view the Metric translation, click the Thread LinkClick icon to show Additional columnsClick icon to show Full Thread DataThreadBasic DiamTPIPitchPitch DiamThread HeightCres/ RootTap Drill SizeLead AngleMinor DiameterThread addendumseriesid#0 - 80 UNF0.06800.01250.05190.00680.00310.04864.39°0.04510.0041Metric Values ➢Classes & Tolerances ➢UNF1#1 - 72 UNF0.073720.01390.0640.00750.00350.06043.95°0.05650.0045Metric Values ➢Classes & Tolerances ➢UNF3#2 - 64 UNF0.086640.01560.07590.00850.00390.07183.75°0.06740.0051Metric Values ➢Classes & Tolerances ➢UNF5#3 - 56 UNF0.099560.01790.08740.00970.00450.08283.72°0.07770.0058Metric Values ➢Classes & Tolerances ➢UNF7#4 - 48 UNF0.112480.02080.09850.01130.00520.0933.85°0.08720.0068Metric Values ➢Classes & Tolerances ➢UNF9#5 - 44 UNF0.125440.02270.11020.01230.00570.10433.75°0.09790.0074Metric Values ➢Classes & Tolerances ➢UNF11#6 - 40 UNF0.138400.02500.12180.01350.00630.11533.74°0.10820.0081Metric Values ➢Classes & Tolerances ➢UNF13#8 - 36 UNF0.164360.02780.1460.0150.00690.13873.47°0.13090.009Metric Values ➢Classes & Tolerances ➢UNF16#10 - 32 UNF0.19320.03130.16970.01690.00780.16163.35°0.15280.0101Metric Values ➢Classes & Tolerances ➢UNF19#12 - 28 UNF0.216280.03570.19280.01930.00890.18353.37°0.17350.0116Metric Values ➢Classes & Tolerances ➢UNF221/4 - 28 UNF0.25280.03570.22680.01930.00890.21752.87°0.20750.0116Metric Values ➢Classes & Tolerances ➢UNF275/16 - 24 UNF0.312240.04170.28490.02260.01040.27412.67°0.26240.0135Metric Values ➢Classes & Tolerances ➢UNF333/8 - 24 UNF0.375240.04170.34790.02260.01040.33712.18°0.32540.0135Metric Values ➢Classes & Tolerances ➢UNF397/16 - 20 UNF0.437200.05000.40450.02710.01250.39152.25°0.37750.0162Metric Values ➢Classes & Tolerances ➢UNF461/2 - 20 UNF0.5200.05000.46750.02710.01250.45451.95°0.44050.0162Metric Values ➢Classes & Tolerances ➢UNF539/16 - 18 UNF0.562180.05560.52590.03010.01390.51141.93°0.49580.018Metric Values ➢Classes & Tolerances ➢UNF605/8 - 18 UNF0.625180.05560.58890.03010.01390.57441.72°0.55880.018Metric Values ➢Classes & Tolerances ➢UNF683/4 - 16 UNF0.75160.06250.70940.03380.01560.69311.61°0.67560.0203Metric Values ➢Classes & Tolerances ➢UNF827/8 - 14 UNF0.875140.07140.82860.03870.01790.811.57°0.78990.0232Metric Values ➢Classes & Tolerances ➢UNF961 - 12 UNF1120.08330.94590.04510.02080.92421.61°0.90080.0271Metric Values ➢Classes & Tolerances ➢UNF1101 1/8 - 12 UNF1.125120.08331.07090.04510.02081.04921.42°1.02580.0271Metric Values ➢Classes & Tolerances ➢UNF1251 1/4 - 12 UNF1.25120.08331.19590.04510.02081.17421.27°1.15080.0271Metric Values ➢Classes & Tolerances ➢UNF1391 3/8 - 12 UNF1.375120.08331.32090.04510.02081.29921.15°1.27580.0271Metric Values ➢Classes & Tolerances ➢UNF1531 1/2 - 12 UNF1.5120.08331.44590.04510.02081.42421.05°1.40080.0271Metric Values ➢Classes & Tolerances ➢UNF169UNEF Series Basic Dimensions chartClick the Thread Link to get the Full Thread Data for all classesAll dimensions are in inches. To view the Metric translation, click the Thread LinkClick icon to show Additional columnsClick icon to show Full Thread DataThreadBasic DiamTPIPitchPitch DiamThread HeightCres/ RootTap Drill SizeLead AngleMinor DiameterThread addendumseriesid#12 - 32 UNEF0.216320.03130.19570.01690.00780.18762.91°0.17880.0101Metric Values ➢Classes & Tolerances ➢UNEF231/4 - 32 UNEF0.25320.03130.22970.01690.00780.22162.48°0.21280.0101Metric Values ➢Classes & Tolerances ➢UNEF285/16 - 32 UNEF0.312320.03130.29170.01690.00780.28361.95°0.27480.0101Metric Values ➢Classes & Tolerances ➢UNEF343/8 - 32 UNEF0.375320.03130.35470.01690.00780.34661.61°0.33780.0101Metric Values ➢Classes & Tolerances ➢UNEF407/16 - 28 UNEF0.437280.03570.41380.01930.00890.40451.57°0.39450.0116Metric Values ➢Classes & Tolerances ➢UNEF471/2 - 28 UNEF0.5280.03570.47680.01930.00890.46751.37°0.45750.0116Metric Values ➢Classes & Tolerances ➢UNEF549/16 - 24 UNEF0.562240.04170.53490.02260.01040.52411.42°0.51240.0135Metric Values ➢Classes & Tolerances ➢UNEF615/8 - 24 UNEF0.625240.04170.59790.02260.01040.58711.27°0.57540.0135Metric Values ➢Classes & Tolerances ➢UNEF6911/16 - 24 UNEF0.687240.04170.65990.02260.01040.64911.15°0.63740.0135Metric Values ➢Classes & Tolerances ➢UNEF753/4 - 20 UNEF0.75200.05000.71750.02710.01250.70451.27°0.69050.0162Metric Values ➢Classes & Tolerances ➢UNEF8313/16 - 20 UNEF0.812200.05000.77950.02710.01250.76651.17°0.75250.0162Metric Values ➢Classes & Tolerances ➢UNEF897/8 - 20 UNEF0.875200.05000.84250.02710.01250.82951.08°0.81550.0162Metric Values ➢Classes & Tolerances ➢UNEF9715/16 - 20 UNEF0.937200.05000.90450.02710.01250.89151.01°0.87750.0162Metric Values ➢Classes & Tolerances ➢UNEF1031 - 20 UNEF1200.05000.96750.02710.01250.95450.94°0.94050.0162Metric Values ➢Classes & Tolerances ➢UNEF1111 1/16 - 18 UNEF1.062180.05561.02590.03010.01391.01140.99°0.99580.018Metric Values ➢Classes & Tolerances ➢UNEF1181 1/8 - 18 UNEF1.125180.05561.08890.03010.01391.07440.93°1.05880.018Metric Values ➢Classes & Tolerances ➢UNEF1261 3/16 - 18 UNEF1.187180.05561.15090.03010.01391.13640.88°1.12080.018Metric Values ➢Classes & Tolerances ➢UNEF1321 1/4 - 18 UNEF1.25180.05561.21390.03010.01391.19940.83°1.18380.018Metric Values ➢Classes & Tolerances ➢UNEF1401 5/16 - 18 UNEF1.312180.05561.27590.03010.01391.26140.79°1.24580.018Metric Values ➢Classes & Tolerances ➢UNEF1461 3/8 - 18 UNEF1.375180.05561.33890.03010.01391.32440.76°1.30880.018Metric Values ➢Classes & Tolerances ➢UNEF1541 7/16 - 18 UNEF1.437180.05561.40090.03010.01391.38640.72°1.37080.018Metric Values ➢Classes & Tolerances ➢UNEF1611 1/2 - 18 UNEF1.5180.05561.46390.03010.01391.44940.69°1.43380.018Metric Values ➢Classes & Tolerances ➢UNEF1701 9/16 - 18 UNEF1.562180.05561.52590.03010.01391.51140.66°1.49580.018Metric Values ➢Classes & Tolerances ➢UNEF1771 5/8 - 18 UNEF1.625180.05561.58890.03010.01391.57440.64°1.55880.018Metric Values ➢Classes & Tolerances ➢UNEF1831 11/16 - 18 UNEF1.687180.05561.65090.03010.01391.63640.61°1.62080.018Metric Values ➢Classes & Tolerances ➢UNEF189UN Constant Pitch Series Basic Dimensions chartClick the Thread Link to get the Full Thread Data for all classesAll dimensions are in inches. To view the Metric translation, click the Thread LinkClick icon to show Additional columnsClick icon to show Full Thread DataThreadBasic DiamTPIPitchPitch DiamThread HeightCres/ RootTap Drill SizeLead AngleMinor DiameterThread addendumseriesid9/16 - 12 12-UN0.562120.08330.50790.04510.02080.48622.99°0.46280.0271Metric Values ➢Classes & Tolerances ➢12-UN625/8 - 12 12-UN0.625120.08330.57090.04510.02080.54922.66°0.52580.0271Metric Values ➢Classes & Tolerances ➢12-UN7011/16 - 12 12-UN0.687120.08330.63290.04510.02080.61122.4°0.58780.0271Metric Values ➢Classes & Tolerances ➢12-UN763/4 - 12 12-UN0.75120.08330.69590.04510.02080.67422.18°0.65080.0271Metric Values ➢Classes & Tolerances ➢12-UN8413/16 - 12 12-UN0.812120.08330.75790.04510.02080.73622°0.71280.0271Metric Values ➢Classes & Tolerances ➢12-UN907/8 - 12 12-UN0.875120.08330.82090.04510.02080.79921.85°0.77580.0271Metric Values ➢Classes & Tolerances ➢12-UN9815/16 - 12 12-UN0.937120.08330.88290.04510.02080.86121.72°0.83780.0271Metric Values ➢Classes & Tolerances ➢12-UN1041 - 12 12-UN1120.08330.94590.04510.02080.92421.61°0.90080.0271Metric Values ➢Classes & Tolerances ➢12-UN1131 1/16 - 12 12-UN1.062120.08331.00790.04510.02080.98621.51°0.96280.0271Metric Values ➢Classes & Tolerances ➢12-UN1201 1/8 - 12 12-UN1.125120.08331.07090.04510.02081.04921.42°1.02580.0271Metric Values ➢Classes & Tolerances ➢12-UN1281 3/16 - 12 12-UN1.187120.08331.13290.04510.02081.11121.34°1.08780.0271Metric Values ➢Classes & Tolerances ➢12-UN1341 1/4 - 12 12-UN1.25120.08331.19590.04510.02081.17421.27°1.15080.0271Metric Values ➢Classes & Tolerances ➢12-UN1421 5/16 - 12 12-UN1.312120.08331.25790.04510.02081.23621.21°1.21280.0271Metric Values ➢Classes & Tolerances ➢12-UN1481 3/8 - 12 12-UN1.375120.08331.32090.04510.02081.29921.15°1.27580.0271Metric Values ➢Classes & Tolerances ➢12-UN1571 7/16 - 12 12-UN1.437120.08331.38290.04510.02081.36121.1°1.33780.0271Metric Values ➢Classes & Tolerances ➢12-UN1641 1/2 - 12 12-UN1.5120.08331.44590.04510.02081.42421.05°1.40080.0271Metric Values ➢Classes & Tolerances ➢12-UN1731 9/16 - 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6 6-UN460.16673.89170.09020.04173.84830.78°3.80150.0541Metric Values ➢Classes & Tolerances ➢6-UN3114 1/8 - 6 6-UN4.12560.16674.01670.09020.04173.97330.76°3.92650.0541Metric Values ➢Classes & Tolerances ➢6-UN3164 1/4 - 6 6-UN4.2560.16674.14170.09020.04174.09830.73°4.05150.0541Metric Values ➢Classes & Tolerances ➢6-UN3214 3/8 - 6 6-UN4.37560.16674.26670.09020.04174.22330.71°4.17650.0541Metric Values ➢Classes & Tolerances ➢6-UN3264 1/2 - 6 6-UN4.560.16674.39170.09020.04174.34830.69°4.30150.0541Metric Values ➢Classes & Tolerances ➢6-UN3314 5/8 - 6 6-UN4.62560.16674.51670.09020.04174.47330.67°4.42650.0541Metric Values ➢Classes & Tolerances ➢6-UN3364 3/4 - 6 6-UN4.7560.16674.64170.09020.04174.59830.65°4.55150.0541Metric Values ➢Classes & Tolerances ➢6-UN3424 7/8 - 6 6-UN4.87560.16674.76670.09020.04174.72330.64°4.67650.0541Metric Values ➢Classes & Tolerances ➢6-UN3475 - 6 6-UN560.16674.89170.09020.04174.84830.62°4.80150.0541Metric Values ➢Classes & Tolerances ➢6-UN3525 1/8 - 6 6-UN5.12560.16675.01670.09020.04174.97330.61°4.92650.0541Metric Values ➢Classes & Tolerances ➢6-UN3575 1/4 - 6 6-UN5.2560.16675.14170.09020.04175.09830.59°5.05150.0541Metric Values ➢Classes & Tolerances ➢6-UN3625 3/8 - 6 6-UN5.37560.16675.26670.09020.04175.22330.58°5.17650.0541Metric Values ➢Classes & Tolerances ➢6-UN3675 1/2 - 6 6-UN5.560.16675.39170.09020.04175.34830.56°5.30150.0541Metric Values ➢Classes & Tolerances ➢6-UN3725 5/8 - 6 6-UN5.62560.16675.51670.09020.04175.47330.55°5.42650.0541Metric Values ➢Classes & Tolerances ➢6-UN3775 3/4 - 6 6-UN5.7560.16675.64170.09020.04175.59830.54°5.55150.0541Metric Values ➢Classes & Tolerances ➢6-UN3825 7/8 - 6 6-UN5.87560.16675.76670.09020.04175.72330.53°5.67650.0541Metric Values ➢Classes & Tolerances ➢6-UN3876 - 6 6-UN660.16675.89170.09020.04175.84830.52°5.80150.0541Metric Values ➢Classes & Tolerances ➢6-UN3921 - 8 8-UN180.12500.91880.06770.03130.88632.48°0.85120.0406Metric Values ➢Classes & Tolerances ➢8-UN1121 1/16 - 8 8-UN1.06280.12500.98080.06770.03130.94832.32°0.91320.0406Metric Values ➢Classes & Tolerances ➢8-UN1191 1/8 - 8 8-UN1.12580.12501.04380.06770.03131.01132.18°0.97620.0406Metric Values ➢Classes & Tolerances ➢8-UN1271 3/16 - 8 8-UN1.18780.12501.10580.06770.03131.07332.06°1.03820.0406Metric Values ➢Classes & Tolerances ➢8-UN1331 1/4 - 8 8-UN1.2580.12501.16880.06770.03131.13631.95°1.10120.0406Metric Values ➢Classes & Tolerances ➢8-UN1411 5/16 - 8 8-UN1.31280.12501.23080.06770.03131.19831.85°1.16320.0406Metric Values ➢Classes & Tolerances ➢8-UN1471 3/8 - 8 8-UN1.37580.12501.29380.06770.03131.26131.76°1.22620.0406Metric Values ➢Classes & Tolerances ➢8-UN1561 7/16 - 8 8-UN1.43780.12501.35580.06770.03131.32331.68°1.28820.0406Metric Values ➢Classes & Tolerances ➢8-UN1631 1/2 - 8 8-UN1.580.12501.41880.06770.03131.38631.61°1.35120.0406Metric Values ➢Classes & Tolerances ➢8-UN1721 9/16 - 8 8-UN1.56280.12501.48080.06770.03131.44831.54°1.41320.0406Metric Values ➢Classes & Tolerances ➢8-UN1791 5/8 - 8 8-UN1.62580.12501.54380.06770.03131.51131.48°1.47620.0406Metric Values ➢Classes & Tolerances ➢8-UN1851 11/16 - 8 8-UN1.68780.12501.60580.06770.03131.57331.42°1.53820.0406Metric Values ➢Classes & Tolerances ➢8-UN1911 3/4 - 8 8-UN1.7580.12501.66880.06770.03131.63631.37°1.60120.0406Metric Values ➢Classes & Tolerances ➢8-UN1971 13/16 - 8 8-UN1.81280.12501.73080.06770.03131.69831.32°1.66320.0406Metric Values ➢Classes & Tolerances ➢8-UN2021 7/8 - 8 8-UN1.87580.12501.79380.06770.03131.76131.27°1.72620.0406Metric Values ➢Classes & Tolerances ➢8-UN2071 15/16 - 8 8-UN1.93780.12501.85580.06770.03131.82331.23°1.78820.0406Metric Values ➢Classes & Tolerances ➢8-UN2122 - 8 8-UN280.12501.91880.06770.03131.88631.19°1.85120.0406Metric Values ➢Classes & Tolerances ➢8-UN2182 1/8 - 8 8-UN2.12580.12502.04380.06770.03132.01131.12°1.97620.0406Metric Values ➢Classes & Tolerances ➢8-UN2232 1/4 - 8 8-UN2.2580.12502.16880.06770.03132.13631.05°2.10120.0406Metric Values ➢Classes & Tolerances ➢8-UN2292 3/8 - 8 8-UN2.37580.12502.29380.06770.03132.26130.99°2.22620.0406Metric Values ➢Classes & Tolerances ➢8-UN2342 1/2 - 8 8-UN2.580.12502.41880.06770.03132.38630.94°2.35120.0406Metric Values ➢Classes & Tolerances ➢8-UN2412 5/8 - 8 8-UN2.62580.12502.54380.06770.03132.51130.9°2.47620.0406Metric Values ➢Classes & Tolerances ➢8-UN2472 3/4 - 8 8-UN2.7580.12502.66880.06770.03132.63630.85°2.60120.0406Metric Values ➢Classes & Tolerances ➢8-UN2542 7/8 - 8 8-UN2.87580.12502.79380.06770.03132.76130.82°2.72620.0406Metric Values ➢Classes & Tolerances ➢8-UN2603 - 8 8-UN380.12502.91880.06770.03132.88630.78°2.85120.0406Metric Values ➢Classes & Tolerances ➢8-UN2673 1/8 - 8 8-UN3.12580.12503.04380.06770.03133.01130.75°2.97620.0406Metric Values ➢Classes & Tolerances ➢8-UN2733 1/4 - 8 8-UN3.2580.12503.16880.06770.03133.13630.72°3.10120.0406Metric Values ➢Classes & Tolerances ➢8-UN2793 3/8 - 8 8-UN3.37580.12503.29380.06770.03133.26130.69°3.22620.0406Metric Values ➢Classes & Tolerances ➢8-UN2843 1/2 - 8 8-UN3.580.12503.41880.06770.03133.38630.67°3.35120.0406Metric Values ➢Classes & Tolerances ➢8-UN2903 5/8 - 8 8-UN3.62580.12503.54380.06770.03133.51130.64°3.47620.0406Metric Values ➢Classes & Tolerances ➢8-UN2953 3/4 - 8 8-UN3.7580.12503.66880.06770.03133.63630.62°3.60120.0406Metric Values ➢Classes & Tolerances ➢8-UN3013 7/8 - 8 8-UN3.87580.12503.79380.06770.03133.76130.6°3.72620.0406Metric Values ➢Classes & Tolerances ➢8-UN3064 - 8 8-UN480.12503.91880.06770.03133.88630.58°3.85120.0406Metric Values ➢Classes & Tolerances ➢8-UN3124 1/8 - 8 8-UN4.12580.12504.04380.06770.03134.01130.56°3.97620.0406Metric Values ➢Classes & Tolerances ➢8-UN3174 1/4 - 8 8-UN4.2580.12504.16880.06770.03134.13630.55°4.10120.0406Metric Values ➢Classes & Tolerances ➢8-UN3224 3/8 - 8 8-UN4.37580.12504.29380.06770.03134.26130.53°4.22620.0406Metric Values ➢Classes & Tolerances ➢8-UN3274 1/2 - 8 8-UN4.580.12504.41880.06770.03134.38630.52°4.35120.0406Metric Values ➢Classes & Tolerances ➢8-UN3324 5/8 - 8 8-UN4.62580.12504.54380.06770.03134.51130.5°4.47620.0406Metric Values ➢Classes & Tolerances ➢8-UN3374 3/4 - 8 8-UN4.7580.12504.66880.06770.03134.63630.49°4.60120.0406Metric Values ➢Classes & Tolerances ➢8-UN3434 7/8 - 8 8-UN4.87580.12504.79380.06770.03134.76130.48°4.72620.0406Metric Values ➢Classes & Tolerances ➢8-UN3485 - 8 8-UN580.12504.91880.06770.03134.88630.46°4.85120.0406Metric Values ➢Classes & Tolerances ➢8-UN3535 1/8 - 8 8-UN5.12580.12505.04380.06770.03135.01130.45°4.97620.0406Metric Values ➢Classes & Tolerances ➢8-UN3585 1/4 - 8 8-UN5.2580.12505.16880.06770.03135.13630.44°5.10120.0406Metric Values ➢Classes & Tolerances ➢8-UN3635 3/8 - 8 8-UN5.37580.12505.29380.06770.03135.26130.43°5.22620.0406Metric Values ➢Classes & Tolerances ➢8-UN3685 1/2 - 8 8-UN5.580.12505.41880.06770.03135.38630.42°5.35120.0406Metric Values ➢Classes & Tolerances ➢8-UN3735 5/8 - 8 8-UN5.62580.12505.54380.06770.03135.51130.41°5.47620.0406Metric Values ➢Classes & Tolerances ➢8-UN3785 3/4 - 8 8-UN5.7580.12505.66880.06770.03135.63630.4°5.60120.0406Metric Values ➢Classes & Tolerances ➢8-UN3835 7/8 - 8 8-UN5.87580.12505.79380.06770.03135.76130.39°5.72620.0406Metric Values ➢Classes & Tolerances ➢8-UN3886 - 8 8-UN680.12505.91880.06770.03135.88630.39°5.85120.0406Metric Values ➢Classes & Tolerances ➢8-UN393limits of Thread Dimensions (UNC, UNF & UNEF)To manufacture or measure a thread, one has to know the maximum and minimum permissible values of the basic dimensions. These values are calculated according to the thread class (See below). To understand classes, you first need to understand the terms Allowance (Sometimes referred to as deviation) and Tolerances.Definition of terms:Allowance (Deviation): The minimum permissible distance between the basic and actual profile.Tolerance: The width of the tolerance field of a diameter on the actual thread profile. (Pitch, Major & Minor diameters)A small allowance means that the assembly of a male and female thread will be harder, but after assembly, there will be less freedom of movement.A large allowance means that the assembly of a male and female thread will be easier, but after assembly, there will be more freedom of movement.The allowance size does not influence a thread’s production difficulty or price.A wide tolerance is easier and cheaper to produce but yields a larger spread between threads.A narrow tolerance is challenging to produce and more expensive but yields a smaller spread between threads.Unified Thread ClassesThe class is defined by a two-character code.The first character defines is a digit between 1 and 3. 1=Loose fit, 2=Medium fit, and 3=Tight fit.The second character is a letter. A=External thread and B=Internal thread.In the Unified Inch thread system, only classes 1A & 2A have an allowance. The allowance for the two classes is the same.The other 4 classes have an allowance of Zero.All the internal thread profiles (B classes) have no allowance.Classes 1A & 1B: These classes are suitable for applications where a liberal tolerance and allowance are required to permit easy assembly. The maximum diameters of Class 1A threads are smaller than the basic diameter by the allowance amount. The minimum diameters of Class 1B threads are equal to the basic diameters and consequently afford no allowance at maximum material condition.Classes 2A & 2B: Classes 2A (external) and 2B (internal) are the default classes used for the commercial production of Nut, Bols, and otehr threaded fasteners. They are the default class unless otherwise specified. they have the same allowance as classes 1A/1B. However, they have a narrower tolerance field. The difficulty of assembly is the same, but the spread between different parts in a production batch is smaller.Classes 3A & 3B: These classes are suitable for applications where tight fit and accuracy of thread elements are essential. The maximum diameters of Class 3A threads and the minimum diameters of Class 3B threads are the same (Both have zero allowance). The accuracy is high, but the assembly is difficult.Combinations of Classes: The engineer can select any valid class for the male and female threads to achieve his design goals. The valid classes are defined in ASTM B1.1 as follows:Classes 2A, 2A, 3B, and 3B are always valid.Classes 1A & 1B are valid only for UNC threads with a nominal diameter equal to or larger than 1/4″.Unified Thread Allowance.The allowance es should be calculated for external threads with classes 1A and 2A. The allowance of both classes is the same and equals 0.3 times the pitch diameter tolerance of class 2A. It is the function of 3 parameters.D – Basic (nominal diameter)P – Pitch (1/TPI)LE – Length of engagement. If not explicitly specified, the length of engagement is assumed to be 5 pitches. (LE=5*P)All parameters are in inches$ \large es = 0.3 \times \left [ 0.0015 \times \sqrt[3]{D} + 0.0015 \times \sqrt{LE} + 0.015 \times \sqrt[3]{P^{2}} \right ] $\begin{array} \large \,es& = 0.3 \times\,[\,0.0015 \times \sqrt[3]{D} &\\ & +\,0.0015 \times \sqrt{LE}&\\ & + 0.015 \times \sqrt[3]{P^{2}}\,] \end{array}The result should be rounded to 6 decimal places.ASTM B1.1 lists in a long chart the allowance for each thread size. However, the results of this formula are 100% accurate, and there is no need to browse the chart.You can use our Advanced Threading Calculator to obtain the allowance according to a thread description or use the mini-calculator below.Unified Thread Allowance CalculatorPayment options Unified Thread TolerancesThe tolerances TD for internal threads and Td for external threads are derived from the class. The tolerances can be calculated according to the below formulas.Td – Tolerance for External Major DiameterTd2 – Tolerance for External Pitch DiameterTD1 – Tolerance for Internal Minor DiameterTD2 – Tolerance for Internal Pitch DiameterT – Base Tolerance (The tolerance of CLASS 2A pitch diameter is the base tolerance from which other tolerances are derived)D – Basic thread diameter.P – Pitch (1/TPI).LE – Length of engagement. (If unknown, the default is 5 * P)All input parameters and results are in Inches.Base Tolerance Formula$ \large T = 0.0015 \times \sqrt[3]{D} + 0.0015 \times \sqrt{LE} + 0.015 \times \sqrt[3]{P^{2}}$\begin{array} \large \,T& = \,0.0015 \times \sqrt[3]{D} &\\ & +\,0.0015 \times \sqrt{LE}&\\ & + 0.015 \times \sqrt[3]{P^{2}} \end{array}Formulas for External thread(Classes 1A,2A & 3A)$ \large T_{d(1A)} = 0.3 \times T $$ \large T_{d2(1A)} = 1.5 \times T $$ \large T_{d(2A)} = 0.06 \times \sqrt[3]{P^2} $$ \large T_{d2(2A)} = T $$ \large T_{d(3A)} = 0.06 \times \sqrt[3]{P^2} $$ \large T_{d2(3A)} = 0.75 \times T $Formulas for Internal Thread(Classes 1B,2B & 3B)$ \large T_{d1(1B)} = 0.25 \times P\,-\,0.4 \times P^{2} $$ \large T_{d2(1B)} = 1.95 \times T $$ \large T_{d1(2B)} = 0.25 \times P\,-\,0.4 \times P^{2} $$ \large T_{d2(2B)} = 1.30 \times T $$\begin{array}{ll} \large T_{d1(3B)}=&0.05 \times \sqrt[3]{P} + &\\ &0.003 \times \frac{P}{D}\,-\,0.002 \end{array} $$ \large T_{d2(3B)} = 0.975 \times T $The above formulas can be used in most cases. However, ASTM B1.1 lists various scenarios where other formulas or quirky rounding rules apply. Use our Advanced Threading Calculator to get exact results for any thread.Usage notes for the above formulas:The result should be rounded to 6 decimal places.Formulas for external threads are valid for all threads.Formulas for internal threads are valid only for thread diameters above 1/4″, a pitch between 4 and 80 TPI, and engagement lengths up to 1.5 X D.In some cases, ASTM B1.1 dictates special rounding rules.You can use the Threading Calculator, which automatically considers all the above rules.Unified Thread limits CalculationsOnce the Td, TD, & es values are known, the final limits can be calculated according to the formulas below.Formulas for Limits of a Unified Inch External Thread$ \large d_{max}=d-{es} $$ \large d_{min}=d_{max}-T_d $$ \large d_{2max} = d2 – es $$ \large d_{2min}=d_{2max}-T_{d2} $Formulas for Limits of a Unified Inch InternalThread$ \large D_{1min}=D $$ \large D_{1max}=D_{1min}+T_{D1} $$ \large D_{2minx} = D_2 $$ \large D_{2max}=D_{2min}+ T_{D2} $Related Glossary Terms:PitchThread Allowance (es)Major DiameterTooth per inch (tpi)Lead (Threading)Minor DiameterPitch DiameterFundamental TriangleThread Height (Depth)Thread addendumTap Drill SizeMaximum material condition (MMC)Length of Engagement

Series:In most cases, the series will be UNC, UNF, or UNEF (Coarse, Fine, or Extra fine pitch).ASTM B1.1, also defines several constant pitch series. These are denoted by

Formulas for External thread(Classes 1A,2A & 3A)$ \large T_{d(1A)} = 0.3 \times T $$ \large T_{d2(1A)} = 1.5 \times T $$ \large T_{d(2A)} = 0.06 \times \sqrt[3]{P^2} $$ \large T_{d2(2A)} = T $$ \large T_{d(3A)} = 0.06 \times \sqrt[3]{P^2} $$ \large T_{d2(3A)} = 0.75 \times T $

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Un thread calculatormetric

The basic dimensions are nominal dimensions of a unified thread profile without allowance and tolerances (The thread class defines that). They are based on standard ASTM B1.1. The basic dimensions can be used for design. However, for manufacturing and machining, you need the allowable range of each dimension. This data can be found in the standard or in the Limits and Dimensions section below. All the basic dimensions are derived from simple formulas based on the thread’s nominal diameter and pitch.SymbolsList of symbols used in charts and formulas of Unified Inch ThreadsSymbolExplanationBasic Parameters - Diameters and PitchDMajor (Basic) diameter of internal threadD1Minor Diameter - Internal ThreadD2Pitch Diameter - Internal ThreadD3Major diameter, rounded root, internal threaddMajor (Basic) diameter of external threadd1Minor Diameter - External Threadd2Pitch Diameter - External Threadd3MMajor diameter, rounded root, internal threadnNumber of threds per Inch (TPI)PPitch (Distance)LLeadHeight ParametersHHeight of fundamental trianglehsThread Height - External ThreadhasThread addendum - External ThreadhnThread Height - Internal ThreadhanThread addendum - Internal ThreadLength ParametersLELength of EngagmentLtsLength - External ThreadLtnLength- Internal ThreadAllowance, Deviation, and TolerancesTD1Tolerance - D1TD2Tolerance - D2TdTolerance - dTd2Tolerance - d2esAllowance - External ThreadCrest / Root ParametersFcsCrest width - External ThreadFrsRoot width - External ThreadFcsCrest width - Internal ThreadFcsRoot width - Internal ThreadFormulas for basic dimensionsExternal Thread$ \large d=\text{Basic Diameter} $$ \large P=\frac{1}{TPI} $$ \large H=\frac{\sqrt{3}}{2}\times{P} = 0.866025404\times{P} $$ \large h_s=\frac{5}{8}\times{H} $$ \large h_{as}=\frac{3}{8}\times{H}$$ \large d_2=d-{2}\times{h_{as}} $$ \large d_1=d-{2}\times{h_s}$$ \large F_{cs}=\frac{P}{8}$$ \large F_{rs}=\frac{P}{4}$internal thread$ \large D=\text{Basic Diameter} $$ \large P=\frac{1}{TPI} $$ \large H=\frac{\sqrt{3}}{2}\times{P} = 0.866025404\times{P} $$ \large h_n=\frac{5}{8}\times{H} $$ \large h_{an}=\frac{1}{4}\times{H}$$ \large D_1=D-{2}\times{h_n}$$ \large D_2=D1+{2}\times{h_{an}}$$ \large F_{rn}=\frac{P}{8}$$ \large F_{cn}=\frac{P}{4}$Unified Inch Threads Dimensions ChartsUNC Series Basic Dimensions chartClick the Thread Link to get the Full Thread Data for all classesAll dimensions are in inches. To view the Metric translation, click the Thread LinkClick icon to show Additional columnsClick icon to show Full Thread DataThreadBasic DiamTPIPitchPitch DiamThread HeightCres/ RootTap Drill SizeLead AngleMinor DiameterThread addendumseriesid#1 - 64 UNC0.073640.01560.06290.00850.00390.05884.52°0.05440.0051Metric Values ➢Classes & Tolerances ➢UNC2#2 - 56 UNC0.086560.01790.07440.00970.00450.06984.37°0.06470.0058Metric Values ➢Classes & Tolerances ➢UNC4#3 - 48 UNC0.099480.02080.08550.01130.00520.084.44°0.07420.0068Metric Values ➢Classes & Tolerances ➢UNC6#4 - 40 UNC0.112400.02500.09580.01350.00630.08934.75°0.08220.0081Metric Values ➢Classes & Tolerances ➢UNC8#5 - 40 UNC0.125400.02500.10880.01350.00630.10234.18°0.09520.0081Metric Values ➢Classes & Tolerances ➢UNC10#6 - 32 UNC0.138320.03130.11770.01690.00780.10964.83°0.10080.0101Metric Values ➢Classes & Tolerances ➢UNC12#8 - 32 UNC0.164320.03130.14370.01690.00780.13563.96°0.12680.0101Metric Values ➢Classes & Tolerances ➢UNC15#10 - 24 UNC0.19240.04170.16290.02260.01040.15214.65°0.14040.0135Metric Values ➢Classes & Tolerances ➢UNC18#12 - 24 UNC0.216240.04170.18890.02260.01040.17814.02°0.16640.0135Metric Values ➢Classes & Tolerances ➢UNC211/4 - 20 UNC0.25200.05000.21750.02710.01250.20454.18°0.19050.0162Metric Values ➢Classes & Tolerances ➢UNC265/16 - 18 UNC0.312180.05560.27590.03010.01390.26143.67°0.24580.018Metric Values ➢Classes & Tolerances ➢UNC323/8 - 16 UNC0.375160.06250.33440.03380.01560.31813.4°0.30060.0203Metric Values ➢Classes & Tolerances ➢UNC387/16 - 14 UNC0.437140.07140.39060.03870.01790.3723.33°0.35190.0232Metric Values ➢Classes & Tolerances ➢UNC451/2 - 13 UNC0.5130.07690.450.04160.01920.433.11°0.40840.025Metric Values ➢Classes & Tolerances ➢UNC529/16 - 12 UNC0.562120.08330.50790.04510.02080.48622.99°0.46280.0271Metric Values ➢Classes & Tolerances ➢UNC595/8 - 11 UNC0.625110.09090.5660.04920.02270.54232.93°0.51670.0295Metric Values ➢Classes & Tolerances ➢UNC673/4 - 10 UNC0.75100.10000.6850.05410.0250.6592.66°0.63090.0325Metric Values ➢Classes & Tolerances ➢UNC817/8 - 9 UNC0.87590.11110.80280.06010.02780.77392.52°0.74270.0361Metric Values ➢Classes & Tolerances ➢UNC951 - 8 UNC180.12500.91880.06770.03130.88632.48°0.85120.0406Metric Values ➢Classes & Tolerances ➢UNC1091 1/8 - 7 UNC1.12570.14291.03220.07730.03570.9952.52°0.95490.0464Metric Values ➢Classes & Tolerances ➢UNC1241 1/4 - 7 UNC1.2570.14291.15720.07730.03571.122.25°1.07990.0464Metric Values ➢Classes & Tolerances ➢UNC1381 3/8 - 6 UNC1.37560.16671.26670.09020.04171.22332.4°1.17650.0541Metric Values ➢Classes & Tolerances ➢UNC1521 1/2 - 6 UNC1.560.16671.39170.09020.04171.34832.18°1.30150.0541Metric Values ➢Classes & Tolerances ➢UNC1681 3/4 - 5 UNC1.7550.20001.62010.10830.051.5682.25°1.51180.065Metric Values ➢Classes & Tolerances ➢UNC1952 - 4.5 UNC240.22221.85570.12030.05561.79782.18°1.73540.0722Metric Values ➢Classes & Tolerances ➢UNC2162 1/4 - 4.5 UNC2.2540.22222.10570.12030.05562.04781.92°1.98540.0722Metric Values ➢Classes & Tolerances ➢UNC2272 1/2 - 4 UNC2.540.25002.33760.13530.06252.27251.95°2.20230.0812Metric Values ➢Classes & Tolerances ➢UNC2382 3/4 - 4 UNC2.7540.25002.58760.13530.06252.52251.76°2.45230.0812Metric Values ➢Classes & Tolerances ➢UNC2513 - 4 UNC340.25002.83760.13530.06252.77251.61°2.70230.0812Metric Values ➢Classes & Tolerances ➢UNC2643 1/4 - 4 UNC3.2540.25003.08760.13530.06253.02251.48°2.95230.0812Metric Values ➢Classes & Tolerances ➢UNC2763 1/2 - 4 UNC3.540.25003.33760.13530.06253.27251.37°3.20230.0812Metric Values ➢Classes & Tolerances ➢UNC2873 3/4 - 4 UNC3.7540.25003.58760.13530.06253.52251.27°3.45230.0812Metric Values ➢Classes & Tolerances ➢UNC2984 - 4 UNC440.25003.83760.13530.06253.77251.19°3.70230.0812Metric Values ➢Classes & Tolerances ➢UNC309UNF Series Basic Dimensions chartClick the Thread Link to get the Full Thread Data for all classesAll dimensions are in inches. To view the Metric translation, click the Thread LinkClick icon to show Additional columnsClick icon to show Full Thread DataThreadBasic DiamTPIPitchPitch DiamThread HeightCres/ RootTap Drill SizeLead AngleMinor DiameterThread addendumseriesid#0 - 80 UNF0.06800.01250.05190.00680.00310.04864.39°0.04510.0041Metric Values ➢Classes & Tolerances ➢UNF1#1 - 72 UNF0.073720.01390.0640.00750.00350.06043.95°0.05650.0045Metric Values ➢Classes & Tolerances ➢UNF3#2 - 64 UNF0.086640.01560.07590.00850.00390.07183.75°0.06740.0051Metric Values ➢Classes & Tolerances ➢UNF5#3 - 56 UNF0.099560.01790.08740.00970.00450.08283.72°0.07770.0058Metric Values ➢Classes & Tolerances ➢UNF7#4 - 48 UNF0.112480.02080.09850.01130.00520.0933.85°0.08720.0068Metric Values ➢Classes & Tolerances ➢UNF9#5 - 44 UNF0.125440.02270.11020.01230.00570.10433.75°0.09790.0074Metric Values ➢Classes & Tolerances ➢UNF11#6 - 40 UNF0.138400.02500.12180.01350.00630.11533.74°0.10820.0081Metric Values ➢Classes & Tolerances ➢UNF13#8 - 36 UNF0.164360.02780.1460.0150.00690.13873.47°0.13090.009Metric Values ➢Classes & Tolerances ➢UNF16#10 - 32 UNF0.19320.03130.16970.01690.00780.16163.35°0.15280.0101Metric Values ➢Classes & Tolerances ➢UNF19#12 - 28 UNF0.216280.03570.19280.01930.00890.18353.37°0.17350.0116Metric Values ➢Classes & Tolerances ➢UNF221/4 - 28 UNF0.25280.03570.22680.01930.00890.21752.87°0.20750.0116Metric Values ➢Classes & Tolerances ➢UNF275/16 - 24 UNF0.312240.04170.28490.02260.01040.27412.67°0.26240.0135Metric Values ➢Classes & Tolerances ➢UNF333/8 - 24 UNF0.375240.04170.34790.02260.01040.33712.18°0.32540.0135Metric Values ➢Classes & Tolerances ➢UNF397/16 - 20 UNF0.437200.05000.40450.02710.01250.39152.25°0.37750.0162Metric Values ➢Classes & Tolerances ➢UNF461/2 - 20 UNF0.5200.05000.46750.02710.01250.45451.95°0.44050.0162Metric Values ➢Classes & Tolerances ➢UNF539/16 - 18 UNF0.562180.05560.52590.03010.01390.51141.93°0.49580.018Metric Values ➢Classes & Tolerances ➢UNF605/8 - 18 UNF0.625180.05560.58890.03010.01390.57441.72°0.55880.018Metric Values ➢Classes & Tolerances ➢UNF683/4 - 16 UNF0.75160.06250.70940.03380.01560.69311.61°0.67560.0203Metric Values ➢Classes & Tolerances ➢UNF827/8 - 14 UNF0.875140.07140.82860.03870.01790.811.57°0.78990.0232Metric Values ➢Classes & Tolerances ➢UNF961 - 12 UNF1120.08330.94590.04510.02080.92421.61°0.90080.0271Metric Values ➢Classes & Tolerances ➢UNF1101 1/8 - 12 UNF1.125120.08331.07090.04510.02081.04921.42°1.02580.0271Metric Values ➢Classes & Tolerances ➢UNF1251 1/4 - 12 UNF1.25120.08331.19590.04510.02081.17421.27°1.15080.0271Metric Values ➢Classes & Tolerances ➢UNF1391 3/8 - 12 UNF1.375120.08331.32090.04510.02081.29921.15°1.27580.0271Metric Values ➢Classes & Tolerances ➢UNF1531 1/2 - 12 UNF1.5120.08331.44590.04510.02081.42421.05°1.40080.0271Metric Values ➢Classes & Tolerances ➢UNF169UNEF Series Basic Dimensions chartClick the Thread Link to get the Full Thread Data for all classesAll dimensions are in inches. To view the Metric translation, click the Thread LinkClick icon to show Additional columnsClick icon to show Full Thread DataThreadBasic DiamTPIPitchPitch DiamThread HeightCres/ RootTap Drill SizeLead AngleMinor DiameterThread addendumseriesid#12 - 32 UNEF0.216320.03130.19570.01690.00780.18762.91°0.17880.0101Metric Values ➢Classes & Tolerances ➢UNEF231/4 - 32 UNEF0.25320.03130.22970.01690.00780.22162.48°0.21280.0101Metric Values ➢Classes & Tolerances ➢UNEF285/16 - 32 UNEF0.312320.03130.29170.01690.00780.28361.95°0.27480.0101Metric Values ➢Classes & Tolerances ➢UNEF343/8 - 32 UNEF0.375320.03130.35470.01690.00780.34661.61°0.33780.0101Metric Values ➢Classes & Tolerances ➢UNEF407/16 - 28 UNEF0.437280.03570.41380.01930.00890.40451.57°0.39450.0116Metric Values ➢Classes & Tolerances ➢UNEF471/2 - 28 UNEF0.5280.03570.47680.01930.00890.46751.37°0.45750.0116Metric Values ➢Classes & Tolerances ➢UNEF549/16 - 24 UNEF0.562240.04170.53490.02260.01040.52411.42°0.51240.0135Metric Values ➢Classes & Tolerances ➢UNEF615/8 - 24 UNEF0.625240.04170.59790.02260.01040.58711.27°0.57540.0135Metric Values ➢Classes & Tolerances ➢UNEF6911/16 - 24 UNEF0.687240.04170.65990.02260.01040.64911.15°0.63740.0135Metric Values ➢Classes & Tolerances ➢UNEF753/4 - 20 UNEF0.75200.05000.71750.02710.01250.70451.27°0.69050.0162Metric Values ➢Classes & Tolerances ➢UNEF8313/16 - 20 UNEF0.812200.05000.77950.02710.01250.76651.17°0.75250.0162Metric Values ➢Classes & Tolerances ➢UNEF897/8 - 20 UNEF0.875200.05000.84250.02710.01250.82951.08°0.81550.0162Metric Values ➢Classes & Tolerances ➢UNEF9715/16 - 20 UNEF0.937200.05000.90450.02710.01250.89151.01°0.87750.0162Metric Values ➢Classes & Tolerances ➢UNEF1031 - 20 UNEF1200.05000.96750.02710.01250.95450.94°0.94050.0162Metric Values ➢Classes & Tolerances ➢UNEF1111 1/16 - 18 UNEF1.062180.05561.02590.03010.01391.01140.99°0.99580.018Metric Values ➢Classes & Tolerances ➢UNEF1181 1/8 - 18 UNEF1.125180.05561.08890.03010.01391.07440.93°1.05880.018Metric Values ➢Classes & Tolerances ➢UNEF1261 3/16 - 18 UNEF1.187180.05561.15090.03010.01391.13640.88°1.12080.018Metric Values ➢Classes & Tolerances ➢UNEF1321 1/4 - 18 UNEF1.25180.05561.21390.03010.01391.19940.83°1.18380.018Metric Values ➢Classes & Tolerances ➢UNEF1401 5/16 - 18 UNEF1.312180.05561.27590.03010.01391.26140.79°1.24580.018Metric Values ➢Classes & Tolerances ➢UNEF1461 3/8 - 18 UNEF1.375180.05561.33890.03010.01391.32440.76°1.30880.018Metric Values ➢Classes & Tolerances ➢UNEF1541 7/16 - 18 UNEF1.437180.05561.40090.03010.01391.38640.72°1.37080.018Metric Values ➢Classes & Tolerances ➢UNEF1611 1/2 - 18 UNEF1.5180.05561.46390.03010.01391.44940.69°1.43380.018Metric Values ➢Classes & Tolerances ➢UNEF1701 9/16 - 18 UNEF1.562180.05561.52590.03010.01391.51140.66°1.49580.018Metric Values ➢Classes & Tolerances ➢UNEF1771 5/8 - 18 UNEF1.625180.05561.58890.03010.01391.57440.64°1.55880.018Metric Values ➢Classes & Tolerances ➢UNEF1831 11/16 - 18 UNEF1.687180.05561.65090.03010.01391.63640.61°1.62080.018Metric Values ➢Classes & Tolerances ➢UNEF189UN Constant Pitch Series Basic Dimensions chartClick the Thread Link to get the Full Thread Data for all classesAll dimensions are in inches. To view the Metric translation, click the Thread LinkClick icon to show Additional columnsClick icon to show Full Thread DataThreadBasic DiamTPIPitchPitch DiamThread HeightCres/ RootTap Drill SizeLead AngleMinor DiameterThread addendumseriesid9/16 - 12 12-UN0.562120.08330.50790.04510.02080.48622.99°0.46280.0271Metric Values ➢Classes & Tolerances ➢12-UN625/8 - 12 12-UN0.625120.08330.57090.04510.02080.54922.66°0.52580.0271Metric Values ➢Classes & Tolerances ➢12-UN7011/16 - 12 12-UN0.687120.08330.63290.04510.02080.61122.4°0.58780.0271Metric Values ➢Classes & Tolerances ➢12-UN763/4 - 12 12-UN0.75120.08330.69590.04510.02080.67422.18°0.65080.0271Metric Values ➢Classes & Tolerances ➢12-UN8413/16 - 12 12-UN0.812120.08330.75790.04510.02080.73622°0.71280.0271Metric Values ➢Classes & Tolerances ➢12-UN907/8 - 12 12-UN0.875120.08330.82090.04510.02080.79921.85°0.77580.0271Metric Values ➢Classes & Tolerances ➢12-UN9815/16 - 12 12-UN0.937120.08330.88290.04510.02080.86121.72°0.83780.0271Metric Values ➢Classes & Tolerances ➢12-UN1041 - 12 12-UN1120.08330.94590.04510.02080.92421.61°0.90080.0271Metric Values ➢Classes & Tolerances ➢12-UN1131 1/16 - 12 12-UN1.062120.08331.00790.04510.02080.98621.51°0.96280.0271Metric Values ➢Classes & Tolerances ➢12-UN1201 1/8 - 12 12-UN1.125120.08331.07090.04510.02081.04921.42°1.02580.0271Metric Values ➢Classes & Tolerances ➢12-UN1281 3/16 - 12 12-UN1.187120.08331.13290.04510.02081.11121.34°1.08780.0271Metric Values ➢Classes & Tolerances ➢12-UN1341 1/4 - 12 12-UN1.25120.08331.19590.04510.02081.17421.27°1.15080.0271Metric Values ➢Classes & Tolerances ➢12-UN1421 5/16 - 12 12-UN1.312120.08331.25790.04510.02081.23621.21°1.21280.0271Metric Values ➢Classes & Tolerances ➢12-UN1481 3/8 - 12 12-UN1.375120.08331.32090.04510.02081.29921.15°1.27580.0271Metric Values ➢Classes & Tolerances ➢12-UN1571 7/16 - 12 12-UN1.437120.08331.38290.04510.02081.36121.1°1.33780.0271Metric Values ➢Classes & Tolerances ➢12-UN1641 1/2 - 12 12-UN1.5120.08331.44590.04510.02081.42421.05°1.40080.0271Metric Values ➢Classes & Tolerances ➢12-UN1731 9/16 - 12 12-UN1.562120.08331.50790.04510.02081.48621.01°1.46280.0271Metric Values ➢Classes & Tolerances ➢12-UN1801 5/8 - 12 12-UN1.625120.08331.57090.04510.02081.54920.97°1.52580.0271Metric Values ➢Classes & Tolerances ➢12-UN1861 11/16 - 12 12-UN1.687120.08331.63290.04510.02081.61120.93°1.58780.0271Metric Values ➢Classes & Tolerances ➢12-UN1921 3/4 - 12 12-UN1.75120.08331.69590.04510.02081.67420.9°1.65080.0271Metric Values ➢Classes & Tolerances ➢12-UN1981 13/16 - 12 12-UN1.812120.08331.75790.04510.02081.73620.86°1.71280.0271Metric Values ➢Classes & Tolerances ➢12-UN2031 7/8 - 12 12-UN1.875120.08331.82090.04510.02081.79920.83°1.77580.0271Metric Values ➢Classes & Tolerances ➢12-UN2081 15/16 - 12 12-UN1.937120.08331.88290.04510.02081.86120.81°1.83780.0271Metric Values ➢Classes & Tolerances ➢12-UN2132 - 12 12-UN2120.08331.94590.04510.02081.92420.78°1.90080.0271Metric Values ➢Classes & Tolerances ➢12-UN2192 1/8 - 12 12-UN2.125120.08332.07090.04510.02082.04920.73°2.02580.0271Metric Values ➢Classes & Tolerances ➢12-UN2242 1/4 - 12 12-UN2.25120.08332.19590.04510.02082.17420.69°2.15080.0271Metric Values ➢Classes & Tolerances ➢12-UN2302 3/8 - 12 12-UN2.375120.08332.32090.04510.02082.29920.65°2.27580.0271Metric Values ➢Classes & Tolerances ➢12-UN2352 1/2 - 12 12-UN2.5120.08332.44590.04510.02082.42420.62°2.40080.0271Metric Values ➢Classes & Tolerances ➢12-UN2422 5/8 - 12 12-UN2.625120.08332.57090.04510.02082.54920.59°2.52580.0271Metric Values ➢Classes & Tolerances ➢12-UN2482 3/4 - 12 12-UN2.75120.08332.69590.04510.02082.67420.56°2.65080.0271Metric Values ➢Classes & Tolerances ➢12-UN2552 7/8 - 12 12-UN2.875120.08332.82090.04510.02082.79920.54°2.77580.0271Metric Values ➢Classes & Tolerances ➢12-UN2613 - 12 12-UN3120.08332.94590.04510.02082.92420.52°2.90080.0271Metric Values ➢Classes & Tolerances ➢12-UN2683 1/8 - 12 12-UN3.125120.08333.07090.04510.02083.04920.49°3.02580.0271Metric Values ➢Classes & Tolerances ➢12-UN2743 1/4 - 12 12-UN3.25120.08333.19590.04510.02083.17420.48°3.15080.0271Metric Values ➢Classes & Tolerances ➢12-UN2803 3/8 - 12 12-UN3.375120.08333.32090.04510.02083.29920.46°3.27580.0271Metric Values ➢Classes & Tolerances ➢12-UN2853 1/2 - 12 12-UN3.5120.08333.44590.04510.02083.42420.44°3.40080.0271Metric Values ➢Classes & Tolerances ➢12-UN2913 5/8 - 12 12-UN3.625120.08333.57090.04510.02083.54920.43°3.52580.0271Metric Values ➢Classes & Tolerances ➢12-UN2963 3/4 - 12 12-UN3.75120.08333.69590.04510.02083.67420.41°3.65080.0271Metric Values ➢Classes & Tolerances ➢12-UN3023 7/8 - 12 12-UN3.875120.08333.82090.04510.02083.79920.4°3.77580.0271Metric Values ➢Classes & Tolerances ➢12-UN3074 - 12 12-UN4120.08333.94590.04510.02083.92420.39°3.90080.0271Metric Values ➢Classes & Tolerances ➢12-UN3134 1/8 - 12 12-UN4.125120.08334.07090.04510.02084.04920.37°4.02580.0271Metric Values ➢Classes & Tolerances ➢12-UN3184 1/4 - 12 12-UN4.25120.08334.19590.04510.02084.17420.36°4.15080.0271Metric Values ➢Classes & Tolerances ➢12-UN3234 3/8 - 12 12-UN4.375120.08334.32090.04510.02084.29920.35°4.27580.0271Metric Values ➢Classes & Tolerances ➢12-UN3284 1/2 - 12 12-UN4.5120.08334.44590.04510.02084.42420.34°4.40080.0271Metric Values ➢Classes & Tolerances ➢12-UN3334 5/8 - 12 12-UN4.625120.08334.57090.04510.02084.54920.33°4.52580.0271Metric Values ➢Classes & Tolerances ➢12-UN3384 3/4 - 12 12-UN4.75120.08334.69590.04510.02084.67420.32°4.65080.0271Metric Values ➢Classes & Tolerances ➢12-UN3444 7/8 - 12 12-UN4.875120.08334.82090.04510.02084.79920.32°4.77580.0271Metric Values ➢Classes & Tolerances ➢12-UN3495 - 12 12-UN5120.08334.94590.04510.02084.92420.31°4.90080.0271Metric Values ➢Classes & Tolerances ➢12-UN3545 1/8 - 12 12-UN5.125120.08335.07090.04510.02085.04920.3°5.02580.0271Metric Values ➢Classes & Tolerances ➢12-UN3595 1/4 - 12 12-UN5.25120.08335.19590.04510.02085.17420.29°5.15080.0271Metric Values ➢Classes & Tolerances ➢12-UN3645 3/8 - 12 12-UN5.375120.08335.32090.04510.02085.29920.29°5.27580.0271Metric Values ➢Classes & Tolerances ➢12-UN3695 1/2 - 12 12-UN5.5120.08335.44590.04510.02085.42420.28°5.40080.0271Metric Values ➢Classes & Tolerances ➢12-UN3745 5/8 - 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8 8-UN2.7580.12502.66880.06770.03132.63630.85°2.60120.0406Metric Values ➢Classes & Tolerances ➢8-UN2542 7/8 - 8 8-UN2.87580.12502.79380.06770.03132.76130.82°2.72620.0406Metric Values ➢Classes & Tolerances ➢8-UN2603 - 8 8-UN380.12502.91880.06770.03132.88630.78°2.85120.0406Metric Values ➢Classes & Tolerances ➢8-UN2673 1/8 - 8 8-UN3.12580.12503.04380.06770.03133.01130.75°2.97620.0406Metric Values ➢Classes & Tolerances ➢8-UN2733 1/4 - 8 8-UN3.2580.12503.16880.06770.03133.13630.72°3.10120.0406Metric Values ➢Classes & Tolerances ➢8-UN2793 3/8 - 8 8-UN3.37580.12503.29380.06770.03133.26130.69°3.22620.0406Metric Values ➢Classes & Tolerances ➢8-UN2843 1/2 - 8 8-UN3.580.12503.41880.06770.03133.38630.67°3.35120.0406Metric Values ➢Classes & Tolerances ➢8-UN2903 5/8 - 8 8-UN3.62580.12503.54380.06770.03133.51130.64°3.47620.0406Metric Values ➢Classes & Tolerances ➢8-UN2953 3/4 - 8 8-UN3.7580.12503.66880.06770.03133.63630.62°3.60120.0406Metric Values ➢Classes & Tolerances ➢8-UN3013 7/8 - 8 8-UN3.87580.12503.79380.06770.03133.76130.6°3.72620.0406Metric Values ➢Classes & Tolerances ➢8-UN3064 - 8 8-UN480.12503.91880.06770.03133.88630.58°3.85120.0406Metric Values ➢Classes & Tolerances ➢8-UN3124 1/8 - 8 8-UN4.12580.12504.04380.06770.03134.01130.56°3.97620.0406Metric Values ➢Classes & Tolerances ➢8-UN3174 1/4 - 8 8-UN4.2580.12504.16880.06770.03134.13630.55°4.10120.0406Metric Values ➢Classes & Tolerances ➢8-UN3224 3/8 - 8 8-UN4.37580.12504.29380.06770.03134.26130.53°4.22620.0406Metric Values ➢Classes & Tolerances ➢8-UN3274 1/2 - 8 8-UN4.580.12504.41880.06770.03134.38630.52°4.35120.0406Metric Values ➢Classes & Tolerances ➢8-UN3324 5/8 - 8 8-UN4.62580.12504.54380.06770.03134.51130.5°4.47620.0406Metric Values ➢Classes & Tolerances ➢8-UN3374 3/4 - 8 8-UN4.7580.12504.66880.06770.03134.63630.49°4.60120.0406Metric Values ➢Classes & Tolerances ➢8-UN3434 7/8 - 8 8-UN4.87580.12504.79380.06770.03134.76130.48°4.72620.0406Metric Values ➢Classes & Tolerances ➢8-UN3485 - 8 8-UN580.12504.91880.06770.03134.88630.46°4.85120.0406Metric Values ➢Classes & Tolerances ➢8-UN3535 1/8 - 8 8-UN5.12580.12505.04380.06770.03135.01130.45°4.97620.0406Metric Values ➢Classes & Tolerances ➢8-UN3585 1/4 - 8 8-UN5.2580.12505.16880.06770.03135.13630.44°5.10120.0406Metric Values ➢Classes & Tolerances ➢8-UN3635 3/8 - 8 8-UN5.37580.12505.29380.06770.03135.26130.43°5.22620.0406Metric Values ➢Classes & Tolerances ➢8-UN3685 1/2 - 8 8-UN5.580.12505.41880.06770.03135.38630.42°5.35120.0406Metric Values ➢Classes & Tolerances ➢8-UN3735 5/8 - 8 8-UN5.62580.12505.54380.06770.03135.51130.41°5.47620.0406Metric Values ➢Classes & Tolerances ➢8-UN3785 3/4 - 8 8-UN5.7580.12505.66880.06770.03135.63630.4°5.60120.0406Metric Values ➢Classes & Tolerances ➢8-UN3835 7/8 - 8 8-UN5.87580.12505.79380.06770.03135.76130.39°5.72620.0406Metric Values ➢Classes & Tolerances ➢8-UN3886 - 8 8-UN680.12505.91880.06770.03135.88630.39°5.85120.0406Metric Values ➢Classes & Tolerances ➢8-UN393limits of Thread Dimensions (UNC, UNF & UNEF)To manufacture or measure a thread, one has to know the maximum and minimum permissible values of the basic dimensions. These values are calculated according to the thread class (See below). To understand classes, you first need to understand the terms Allowance (Sometimes referred to as deviation) and Tolerances.Definition of terms:Allowance (Deviation): The minimum permissible distance between the basic and actual profile.Tolerance: The width of the tolerance field of a diameter on the actual thread profile. (Pitch, Major & Minor diameters)A small allowance means that the assembly of a male and female thread will be harder, but after assembly, there will be less freedom of movement.A large allowance means that the assembly of a male and female thread will be easier, but after assembly, there will be more freedom of movement.The allowance size does not influence a thread’s production difficulty or price.A wide tolerance is easier and cheaper to produce but yields a larger spread between threads.A narrow tolerance is challenging to produce and more expensive but yields a smaller spread between threads.Unified Thread ClassesThe class is defined by a two-character code.The first character defines is a digit between 1 and 3. 1=Loose fit, 2=Medium fit, and 3=Tight fit.The second character is a letter. A=External thread and B=Internal thread.In the Unified Inch thread system, only classes 1A & 2A have an allowance. The allowance for the two classes is the same.The other 4 classes have an allowance of Zero.All the internal thread profiles (B classes) have no allowance.Classes 1A & 1B: These classes are suitable for applications where a liberal tolerance and allowance are required to permit easy assembly. The maximum diameters of Class 1A threads are smaller than the basic diameter by the allowance amount. The minimum diameters of Class 1B threads are equal to the basic diameters and consequently afford no allowance at maximum material condition.Classes 2A & 2B: Classes 2A (external) and 2B (internal) are the default classes used for the commercial production of Nut, Bols, and otehr threaded fasteners. They are the default class unless otherwise specified. they have the same allowance as classes 1A/1B. However, they have a narrower tolerance field. The difficulty of assembly is the same, but the spread between different parts in a production batch is smaller.Classes 3A & 3B: These classes are suitable for applications where tight fit and accuracy of thread elements are essential. The maximum diameters of Class 3A threads and the minimum diameters of Class 3B threads are the same (Both have zero allowance). The accuracy is high, but the assembly is difficult.Combinations of Classes: The engineer can select any valid class for the male and female threads to achieve his design goals. The valid classes are defined in ASTM B1.1 as follows:Classes 2A, 2A, 3B, and 3B are always valid.Classes 1A & 1B are valid only for UNC threads with a nominal diameter equal to or larger than 1/4″.Unified Thread Allowance.The allowance es should be calculated for external threads with classes 1A and 2A. The allowance of both classes is the same and equals 0.3 times the pitch diameter tolerance of class 2A. It is the function of 3 parameters.D – Basic (nominal diameter)P – Pitch (1/TPI)LE – Length of engagement. If not explicitly specified, the length of engagement is assumed to be 5 pitches. (LE=5*P)All parameters are in inches$ \large es = 0.3 \times \left [ 0.0015 \times \sqrt[3]{D} + 0.0015 \times \sqrt{LE} + 0.015 \times \sqrt[3]{P^{2}} \right ] $\begin{array} \large \,es& = 0.3 \times\,[\,0.0015 \times \sqrt[3]{D} &\\ & +\,0.0015 \times \sqrt{LE}&\\ & + 0.015 \times \sqrt[3]{P^{2}}\,] \end{array}The result should be rounded to 6 decimal places.ASTM B1.1 lists in a long chart the allowance for each thread size. However, the results of this formula are 100% accurate, and there is no need to browse the chart.You can use our Advanced Threading Calculator to obtain the allowance according to a thread description or use the mini-calculator below.Unified Thread Allowance CalculatorPayment options Unified Thread TolerancesThe tolerances TD for internal threads and Td for external threads are derived from the class. The tolerances can be calculated according to the below formulas.Td – Tolerance for External Major DiameterTd2 – Tolerance for External Pitch DiameterTD1 – Tolerance for Internal Minor DiameterTD2 – Tolerance for Internal Pitch DiameterT – Base Tolerance (The tolerance of CLASS 2A pitch diameter is the base tolerance from which other tolerances are derived)D – Basic thread diameter.P – Pitch (1/TPI).LE – Length of engagement. (If unknown, the default is 5 * P)All input parameters and results are in Inches.Base Tolerance Formula$ \large T = 0.0015 \times \sqrt[3]{D} + 0.0015 \times \sqrt{LE} + 0.015 \times \sqrt[3]{P^{2}}$\begin{array} \large \,T& = \,0.0015 \times \sqrt[3]{D} &\\ & +\,0.0015 \times \sqrt{LE}&\\ & + 0.015 \times \sqrt[3]{P^{2}} \end{array}Formulas for External thread(Classes 1A,2A & 3A)$ \large T_{d(1A)} = 0.3 \times T $$ \large T_{d2(1A)} = 1.5 \times T $$ \large T_{d(2A)} = 0.06 \times \sqrt[3]{P^2} $$ \large T_{d2(2A)} = T $$ \large T_{d(3A)} = 0.06 \times \sqrt[3]{P^2} $$ \large T_{d2(3A)} = 0.75 \times T $Formulas for Internal Thread(Classes 1B,2B & 3B)$ \large T_{d1(1B)} = 0.25 \times P\,-\,0.4 \times P^{2} $$ \large T_{d2(1B)} = 1.95 \times T $$ \large T_{d1(2B)} = 0.25 \times P\,-\,0.4 \times P^{2} $$ \large T_{d2(2B)} = 1.30 \times T $$\begin{array}{ll} \large T_{d1(3B)}=&0.05 \times \sqrt[3]{P} + &\\ &0.003 \times \frac{P}{D}\,-\,0.002 \end{array} $$ \large T_{d2(3B)} = 0.975 \times T $The above formulas can be used in most cases. However, ASTM B1.1 lists various scenarios where other formulas or quirky rounding rules apply. Use our Advanced Threading Calculator to get exact results for any thread.Usage notes for the above formulas:The result should be rounded to 6 decimal places.Formulas for external threads are valid for all threads.Formulas for internal threads are valid only for thread diameters above 1/4″, a pitch between 4 and 80 TPI, and engagement lengths up to 1.5 X D.In some cases, ASTM B1.1 dictates special rounding rules.You can use the Threading Calculator, which automatically considers all the above rules.Unified Thread limits CalculationsOnce the Td, TD, & es values are known, the final limits can be calculated according to the formulas below.Formulas for Limits of a Unified Inch External Thread$ \large d_{max}=d-{es} $$ \large d_{min}=d_{max}-T_d $$ \large d_{2max} = d2 – es $$ \large d_{2min}=d_{2max}-T_{d2} $Formulas for Limits of a Unified Inch InternalThread$ \large D_{1min}=D $$ \large D_{1max}=D_{1min}+T_{D1} $$ \large D_{2minx} = D_2 $$ \large D_{2max}=D_{2min}+ T_{D2} $Related Glossary Terms:PitchThread Allowance (es)Major DiameterTooth per inch (tpi)Lead (Threading)Minor DiameterPitch DiameterFundamental TriangleThread Height (Depth)Thread addendumTap Drill SizeMaximum material condition (MMC)Length of Engagement

The charts below show all the possible thread combinations that are defined in ASTM B1.1UNC– Unified Inch Coarse Thread SeriesUNF – Unified Inch Fine Thread SeriesUNEF – Unified Inch Extra Fine Thread Series

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Additional Parameters:Direction: By default, the thread is right-hand. For a left-hand thread, add the suffix -LH.Number of Starts: By default, all threads have a single start. Thus the lead equals the pitch. For a multiple-start thread, the lead is also indicated. For example: 3/4– 0.0625P – 0.1875L UNF denotes a 3/4″ UNF thread with 3 starts. (0.1875/0.0625=3)Designation Examples of Unified ThreadsDesignationThread SeriesInternal /ExternalNominalDiameterTPIPitchLeadClassNumber of StartsThreadDirection#8-32 UNCUNCundefined0.164"320.03125"0.03125"undefined1Right hand1/4 -28 UNF-2AUNFExternal0.25"280.0357"0.0357"2A1Right hand3/4-20 UNEF-3BUNEFInternal0.75"200.05"0.05"3B1Right hand1-12 UN-1AConstant Pitch12 TPIExternal1"120.0833"0.0833"1A1Right hand3/4– 0.0625P – 0.1875L UNF-2AUNFExternal0.75"160.0625"0.1875"2A3Right hand1/4 -28 UNF-2A-LHUNFExternal0.25"280.0357"0.0357"2A1Left handPossible Combinations (Diameter/Pitch)The charts below show all the possible thread combinations that are defined in ASTM B1.1UNC– Unified Inch Coarse Thread SeriesUNF – Unified Inch Fine Thread SeriesUNEF – Unified Inch Extra Fine Thread Series

Internalthread calculator

Basic designation syntax:Nominal Diameter in Inch FractionPitch in TPISeries: UNC / UNF / UNEF / UNClass: 1A, 2A, 3A, 1B, 2B or 3B.

Click icon to show Full Thread DataThreadBasic DiamTPIPitchPitch DiamThread HeightCres/ RootTap Drill SizeLead AngleMinor DiameterThread addendumseriesid#1 - 64 UNC0.073640.01560.06290.00850.00390.05884.52°0.05440.0051Metric Values ➢Classes & Tolerances ➢UNC2#2 - 56 UNC0.086560.01790.07440.00970.00450.06984.37°0.06470.0058Metric Values ➢Classes & Tolerances ➢UNC4#3 - 48 UNC0.099480.02080.08550.01130.00520.084.44°0.07420.0068Metric Values ➢Classes & Tolerances ➢UNC6#4 - 40 UNC0.112400.02500.09580.01350.00630.08934.75°0.08220.0081Metric Values ➢Classes & Tolerances ➢UNC8#5 - 40 UNC0.125400.02500.10880.01350.00630.10234.18°0.09520.0081Metric Values ➢Classes & Tolerances ➢UNC10#6 - 32 UNC0.138320.03130.11770.01690.00780.10964.83°0.10080.0101Metric Values ➢Classes & Tolerances ➢UNC12#8 - 32 UNC0.164320.03130.14370.01690.00780.13563.96°0.12680.0101Metric Values ➢Classes & Tolerances ➢UNC15#10 - 24 UNC0.19240.04170.16290.02260.01040.15214.65°0.14040.0135Metric Values ➢Classes & Tolerances ➢UNC18#12 - 24 UNC0.216240.04170.18890.02260.01040.17814.02°0.16640.0135Metric Values ➢Classes & Tolerances ➢UNC211/4 - 20 UNC0.25200.05000.21750.02710.01250.20454.18°0.19050.0162Metric Values ➢Classes & Tolerances ➢UNC265/16 - 18 UNC0.312180.05560.27590.03010.01390.26143.67°0.24580.018Metric Values ➢Classes & Tolerances ➢UNC323/8 - 16 UNC0.375160.06250.33440.03380.01560.31813.4°0.30060.0203Metric Values ➢Classes & Tolerances ➢UNC387/16 - 14 UNC0.437140.07140.39060.03870.01790.3723.33°0.35190.0232Metric Values ➢Classes & Tolerances ➢UNC451/2 - 13 UNC0.5130.07690.450.04160.01920.433.11°0.40840.025Metric Values ➢Classes & Tolerances ➢UNC529/16 - 12 UNC0.562120.08330.50790.04510.02080.48622.99°0.46280.0271Metric Values ➢Classes & Tolerances ➢UNC595/8 - 11 UNC0.625110.09090.5660.04920.02270.54232.93°0.51670.0295Metric Values ➢Classes & Tolerances ➢UNC673/4 - 10 UNC0.75100.10000.6850.05410.0250.6592.66°0.63090.0325Metric Values ➢Classes & Tolerances ➢UNC817/8 - 9 UNC0.87590.11110.80280.06010.02780.77392.52°0.74270.0361Metric Values ➢Classes & Tolerances ➢UNC951 - 8 UNC180.12500.91880.06770.03130.88632.48°0.85120.0406Metric Values ➢Classes & Tolerances ➢UNC1091 1/8 - 7 UNC1.12570.14291.03220.07730.03570.9952.52°0.95490.0464Metric Values ➢Classes & Tolerances ➢UNC1241 1/4 - 7 UNC1.2570.14291.15720.07730.03571.122.25°1.07990.0464Metric Values ➢Classes & Tolerances ➢UNC1381 3/8 - 6 UNC1.37560.16671.26670.09020.04171.22332.4°1.17650.0541Metric Values ➢Classes & Tolerances ➢UNC1521 1/2 - 6 UNC1.560.16671.39170.09020.04171.34832.18°1.30150.0541Metric Values ➢Classes & Tolerances ➢UNC1681 3/4 - 5 UNC1.7550.20001.62010.10830.051.5682.25°1.51180.065Metric Values ➢Classes & Tolerances ➢UNC1952 - 4.5 UNC240.22221.85570.12030.05561.79782.18°1.73540.0722Metric Values ➢Classes & Tolerances ➢UNC2162 1/4 - 4.5 UNC2.2540.22222.10570.12030.05562.04781.92°1.98540.0722Metric Values ➢Classes & Tolerances ➢UNC2272 1/2 - 4 UNC2.540.25002.33760.13530.06252.27251.95°2.20230.0812Metric Values ➢Classes & Tolerances ➢UNC2382 3/4 - 4 UNC2.7540.25002.58760.13530.06252.52251.76°2.45230.0812Metric Values ➢Classes & Tolerances ➢UNC2513 - 4 UNC340.25002.83760.13530.06252.77251.61°2.70230.0812Metric Values ➢Classes & Tolerances ➢UNC2643 1/4 - 4 UNC3.2540.25003.08760.13530.06253.02251.48°2.95230.0812Metric Values ➢Classes & Tolerances ➢UNC2763 1/2 - 4 UNC3.540.25003.33760.13530.06253.27251.37°3.20230.0812Metric Values ➢Classes & Tolerances ➢UNC2873 3/4 - 4 UNC3.7540.25003.58760.13530.06253.52251.27°3.45230.0812Metric Values ➢Classes & Tolerances ➢UNC2984 - 4 UNC440.25003.83760.13530.06253.77251.19°3.70230.0812Metric Values ➢Classes & Tolerances ➢UNC309UNF Series Basic Dimensions chartClick the Thread Link to get the Full Thread Data for all classesAll dimensions are in inches. To view the Metric translation, click the Thread LinkClick icon to show Additional columnsClick icon to show Full Thread DataThreadBasic DiamTPIPitchPitch DiamThread HeightCres/ RootTap Drill SizeLead AngleMinor DiameterThread addendumseriesid#0 - 80 UNF0.06800.01250.05190.00680.00310.04864.39°0.04510.0041Metric Values ➢Classes & Tolerances ➢UNF1#1 - 72 UNF0.073720.01390.0640.00750.00350.06043.95°0.05650.0045Metric Values ➢Classes & Tolerances ➢UNF3#2 - 64 UNF0.086640.01560.07590.00850.00390.07183.75°0.06740.0051Metric Values ➢Classes & Tolerances ➢UNF5#3 - 56 UNF0.099560.01790.08740.00970.00450.08283.72°0.07770.0058Metric Values ➢Classes & Tolerances ➢UNF7#4 - 48 UNF0.112480.02080.09850.01130.00520.0933.85°0.08720.0068Metric Values ➢Classes & Tolerances ➢UNF9#5 - 44 UNF0.125440.02270.11020.01230.00570.10433.75°0.09790.0074Metric Values ➢Classes & Tolerances ➢UNF11#6 - 40 UNF0.138400.02500.12180.01350.00630.11533.74°0.10820.0081Metric Values ➢Classes & Tolerances ➢UNF13#8 - 36 UNF0.164360.02780.1460.0150.00690.13873.47°0.13090.009Metric Values ➢Classes & Tolerances ➢UNF16#10 - 32 UNF0.19320.03130.16970.01690.00780.16163.35°0.15280.0101Metric Values ➢Classes & Tolerances ➢UNF19#12 - 28 UNF0.216280.03570.19280.01930.00890.18353.37°0.17350.0116Metric Values ➢Classes & Tolerances ➢UNF221/4 - 28 UNF0.25280.03570.22680.01930.00890.21752.87°0.20750.0116Metric Values ➢Classes & Tolerances ➢UNF275/16 - 24 UNF0.312240.04170.28490.02260.01040.27412.67°0.26240.0135Metric Values ➢Classes & Tolerances ➢UNF333/8 - 24 UNF0.375240.04170.34790.02260.01040.33712.18°0.32540.0135Metric Values ➢Classes & Tolerances ➢UNF397/16 - 20 UNF0.437200.05000.40450.02710.01250.39152.25°0.37750.0162Metric Values ➢Classes & Tolerances ➢UNF461/2 - 20 UNF0.5200.05000.46750.02710.01250.45451.95°0.44050.0162Metric Values ➢Classes & Tolerances ➢UNF539/16 - 18 UNF0.562180.05560.52590.03010.01390.51141.93°0.49580.018Metric Values ➢Classes & Tolerances ➢UNF605/8 - 18 UNF0.625180.05560.58890.03010.01390.57441.72°0.55880.018Metric Values ➢Classes & Tolerances ➢UNF683/4 - 16 UNF0.75160.06250.70940.03380.01560.69311.61°0.67560.0203Metric Values ➢Classes & Tolerances ➢UNF827/8 - 14 UNF0.875140.07140.82860.03870.01790.811.57°0.78990.0232Metric Values ➢Classes & Tolerances ➢UNF961 - 12 UNF1120.08330.94590.04510.02080.92421.61°0.90080.0271Metric Values ➢Classes & Tolerances ➢UNF1101 1/8 - 12 UNF1.125120.08331.07090.04510.02081.04921.42°1.02580.0271Metric Values ➢Classes & Tolerances ➢UNF1251 1/4 - 12 UNF1.25120.08331.19590.04510.02081.17421.27°1.15080.0271Metric Values ➢Classes & Tolerances ➢UNF1391 3/8 - 12 UNF1.375120.08331.32090.04510.02081.29921.15°1.27580.0271Metric Values ➢Classes & Tolerances ➢UNF1531 1/2 - 12 UNF1.5120.08331.44590.04510.02081.42421.05°1.40080.0271Metric Values ➢Classes & Tolerances ➢UNF169UNEF Series Basic Dimensions chartClick the Thread Link to get the Full Thread Data for all classesAll dimensions are in inches. To view the Metric translation, click the Thread LinkClick icon to show Additional columnsClick icon to show Full Thread DataThreadBasic DiamTPIPitchPitch DiamThread HeightCres/ RootTap Drill SizeLead AngleMinor DiameterThread addendumseriesid#12 - 32 UNEF0.216320.03130.19570.01690.00780.18762.91°0.17880.0101Metric Values ➢Classes & Tolerances ➢UNEF231/4 - 32 UNEF0.25320.03130.22970.01690.00780.22162.48°0.21280.0101Metric Values ➢Classes & Tolerances ➢UNEF285/16 - 32 UNEF0.312320.03130.29170.01690.00780.28361.95°0.27480.0101Metric Values ➢Classes & Tolerances ➢UNEF343/8 - 32 UNEF0.375320.03130.35470.01690.00780.34661.61°0.33780.0101Metric Values ➢Classes & Tolerances ➢UNEF407/16 - 28 UNEF0.437280.03570.41380.01930.00890.40451.57°0.39450.0116Metric Values ➢Classes & Tolerances ➢UNEF471/2 - 28 UNEF0.5280.03570.47680.01930.00890.46751.37°0.45750.0116Metric Values ➢Classes & Tolerances ➢UNEF549/16 - 24 UNEF0.562240.04170.53490.02260.01040.52411.42°0.51240.0135Metric Values ➢Classes & Tolerances ➢UNEF615/8 - 24 UNEF0.625240.04170.59790.02260.01040.58711.27°0.57540.0135Metric Values ➢Classes & Tolerances ➢UNEF6911/16 - 24 UNEF0.687240.04170.65990.02260.01040.64911.15°0.63740.0135Metric Values ➢Classes & Tolerances ➢UNEF753/4 - 20 UNEF0.75200.05000.71750.02710.01250.70451.27°0.69050.0162Metric Values ➢Classes & Tolerances ➢UNEF8313/16 - 20 UNEF0.812200.05000.77950.02710.01250.76651.17°0.75250.0162Metric Values ➢Classes & Tolerances ➢UNEF897/8 - 20 UNEF0.875200.05000.84250.02710.01250.82951.08°0.81550.0162Metric Values ➢Classes & Tolerances ➢UNEF9715/16 - 20 UNEF0.937200.05000.90450.02710.01250.89151.01°0.87750.0162Metric Values ➢Classes & Tolerances ➢UNEF1031 - 20 UNEF1200.05000.96750.02710.01250.95450.94°0.94050.0162Metric Values ➢Classes & Tolerances ➢UNEF1111 1/16 - 18 UNEF1.062180.05561.02590.03010.01391.01140.99°0.99580.018Metric Values ➢Classes & Tolerances ➢UNEF1181 1/8 - 18 UNEF1.125180.05561.08890.03010.01391.07440.93°1.05880.018Metric Values ➢Classes & Tolerances ➢UNEF1261 3/16 - 18 UNEF1.187180.05561.15090.03010.01391.13640.88°1.12080.018Metric Values ➢Classes & Tolerances ➢UNEF1321 1/4 - 18 UNEF1.25180.05561.21390.03010.01391.19940.83°1.18380.018Metric Values ➢Classes & Tolerances ➢UNEF1401 5/16 - 18 UNEF1.312180.05561.27590.03010.01391.26140.79°1.24580.018Metric Values ➢Classes & Tolerances ➢UNEF1461 3/8 - 18 UNEF1.375180.05561.33890.03010.01391.32440.76°1.30880.018Metric Values ➢Classes & Tolerances ➢UNEF1541 7/16 - 18 UNEF1.437180.05561.40090.03010.01391.38640.72°1.37080.018Metric Values ➢Classes & Tolerances ➢UNEF1611 1/2 - 18 UNEF1.5180.05561.46390.03010.01391.44940.69°1.43380.018Metric Values ➢Classes & Tolerances ➢UNEF1701 9/16 - 18 UNEF1.562180.05561.52590.03010.01391.51140.66°1.49580.018Metric Values ➢Classes & Tolerances ➢UNEF1771 5/8 - 18 UNEF1.625180.05561.58890.03010.01391.57440.64°1.55880.018Metric Values ➢Classes & Tolerances ➢UNEF1831 11/16 - 18 UNEF1.687180.05561.65090.03010.01391.63640.61°1.62080.018Metric Values ➢Classes & Tolerances ➢UNEF189UN Constant Pitch Series Basic Dimensions chartClick the Thread Link to get the Full Thread Data for all classesAll dimensions are in inches. To view the Metric translation, click the Thread LinkClick icon to show Additional columnsClick icon to show Full Thread DataThreadBasic DiamTPIPitchPitch DiamThread HeightCres/ RootTap Drill SizeLead AngleMinor DiameterThread addendumseriesid9/16 - 12 12-UN0.562120.08330.50790.04510.02080.48622.99°0.46280.0271Metric Values ➢Classes & Tolerances ➢12-UN625/8 - 12 12-UN0.625120.08330.57090.04510.02080.54922.66°0.52580.0271Metric Values ➢Classes & Tolerances ➢12-UN7011/16 - 12 12-UN0.687120.08330.63290.04510.02080.61122.4°0.58780.0271Metric Values ➢Classes & Tolerances ➢12-UN763/4 - 12 12-UN0.75120.08330.69590.04510.02080.67422.18°0.65080.0271Metric Values ➢Classes & Tolerances ➢12-UN8413/16 - 12 12-UN0.812120.08330.75790.04510.02080.73622°0.71280.0271Metric Values ➢Classes & Tolerances ➢12-UN907/8 - 12 12-UN0.875120.08330.82090.04510.02080.79921.85°0.77580.0271Metric Values ➢Classes & Tolerances ➢12-UN9815/16 - 12 12-UN0.937120.08330.88290.04510.02080.86121.72°0.83780.0271Metric Values ➢Classes & Tolerances ➢12-UN1041 - 12 12-UN1120.08330.94590.04510.02080.92421.61°0.90080.0271Metric Values ➢Classes & Tolerances ➢12-UN1131 1/16 - 12 12-UN1.062120.08331.00790.04510.02080.98621.51°0.96280.0271Metric Values ➢Classes & Tolerances ➢12-UN1201 1/8 - 12 12-UN1.125120.08331.07090.04510.02081.04921.42°1.02580.0271Metric Values ➢Classes & Tolerances ➢12-UN1281 3/16 - 12 12-UN1.187120.08331.13290.04510.02081.11121.34°1.08780.0271Metric Values ➢Classes & Tolerances ➢12-UN1341 1/4 - 12 12-UN1.25120.08331.19590.04510.02081.17421.27°1.15080.0271Metric Values ➢Classes & Tolerances ➢12-UN1421 5/16 - 12 12-UN1.312120.08331.25790.04510.02081.23621.21°1.21280.0271Metric Values ➢Classes & Tolerances ➢12-UN1481 3/8 - 12 12-UN1.375120.08331.32090.04510.02081.29921.15°1.27580.0271Metric Values ➢Classes & Tolerances ➢12-UN1571 7/16 - 12 12-UN1.437120.08331.38290.04510.02081.36121.1°1.33780.0271Metric Values ➢Classes & Tolerances ➢12-UN1641 1/2 - 12 12-UN1.5120.08331.44590.04510.02081.42421.05°1.40080.0271Metric Values ➢Classes & Tolerances ➢12-UN1731 9/16 - 12 12-UN1.562120.08331.50790.04510.02081.48621.01°1.46280.0271Metric Values ➢Classes & Tolerances ➢12-UN1801 5/8 - 12 12-UN1.625120.08331.57090.04510.02081.54920.97°1.52580.0271Metric Values ➢Classes & Tolerances ➢12-UN1861 11/16 - 12 12-UN1.687120.08331.63290.04510.02081.61120.93°1.58780.0271Metric Values ➢Classes & Tolerances ➢12-UN1921 3/4 - 12 12-UN1.75120.08331.69590.04510.02081.67420.9°1.65080.0271Metric Values ➢Classes & Tolerances ➢12-UN1981 13/16 - 12 12-UN1.812120.08331.75790.04510.02081.73620.86°1.71280.0271Metric Values ➢Classes & Tolerances ➢12-UN2031 7/8 - 12 12-UN1.875120.08331.82090.04510.02081.79920.83°1.77580.0271Metric Values ➢Classes & Tolerances ➢12-UN2081 15/16 - 12 12-UN1.937120.08331.88290.04510.02081.86120.81°1.83780.0271Metric Values ➢Classes & Tolerances ➢12-UN2132 - 12 12-UN2120.08331.94590.04510.02081.92420.78°1.90080.0271Metric Values ➢Classes & Tolerances ➢12-UN2192 1/8 - 12 12-UN2.125120.08332.07090.04510.02082.04920.73°2.02580.0271Metric Values ➢Classes & Tolerances ➢12-UN2242 1/4 - 12 12-UN2.25120.08332.19590.04510.02082.17420.69°2.15080.0271Metric Values ➢Classes & Tolerances ➢12-UN2302 3/8 - 12 12-UN2.375120.08332.32090.04510.02082.29920.65°2.27580.0271Metric Values ➢Classes & Tolerances ➢12-UN2352 1/2 - 12 12-UN2.5120.08332.44590.04510.02082.42420.62°2.40080.0271Metric Values ➢Classes & Tolerances ➢12-UN2422 5/8 - 12 12-UN2.625120.08332.57090.04510.02082.54920.59°2.52580.0271Metric Values ➢Classes & Tolerances ➢12-UN2482 3/4 - 12 12-UN2.75120.08332.69590.04510.02082.67420.56°2.65080.0271Metric Values ➢Classes & Tolerances ➢12-UN2552 7/8 - 12 12-UN2.875120.08332.82090.04510.02082.79920.54°2.77580.0271Metric Values ➢Classes & Tolerances ➢12-UN2613 - 12 12-UN3120.08332.94590.04510.02082.92420.52°2.90080.0271Metric Values ➢Classes & Tolerances ➢12-UN2683 1/8 - 12 12-UN3.125120.08333.07090.04510.02083.04920.49°3.02580.0271Metric Values ➢Classes & Tolerances ➢12-UN2743 1/4 - 12 12-UN3.25120.08333.19590.04510.02083.17420.48°3.15080.0271Metric Values ➢Classes & Tolerances ➢12-UN2803 3/8 - 12 12-UN3.375120.08333.32090.04510.02083.29920.46°3.27580.0271Metric Values ➢Classes & Tolerances ➢12-UN2853 1/2 - 12 12-UN3.5120.08333.44590.04510.02083.42420.44°3.40080.0271Metric Values ➢Classes & Tolerances ➢12-UN2913 5/8 - 12 12-UN3.625120.08333.57090.04510.02083.54920.43°3.52580.0271Metric Values ➢Classes & Tolerances ➢12-UN2963 3/4 - 12 12-UN3.75120.08333.69590.04510.02083.67420.41°3.65080.0271Metric Values ➢Classes & Tolerances ➢12-UN3023 7/8 - 12 12-UN3.875120.08333.82090.04510.02083.79920.4°3.77580.0271Metric Values ➢Classes & Tolerances ➢12-UN3074 - 12 12-UN4120.08333.94590.04510.02083.92420.39°3.90080.0271Metric Values ➢Classes & Tolerances ➢12-UN3134 1/8 - 12 12-UN4.125120.08334.07090.04510.02084.04920.37°4.02580.0271Metric Values ➢Classes & Tolerances ➢12-UN3184 1/4 - 12 12-UN4.25120.08334.19590.04510.02084.17420.36°4.15080.0271Metric Values ➢Classes & Tolerances ➢12-UN3234 3/8 - 12 12-UN4.375120.08334.32090.04510.02084.29920.35°4.27580.0271Metric Values ➢Classes & Tolerances ➢12-UN3284 1/2 - 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32 32-UN0.75320.03130.72970.01690.00780.72160.78°0.71280.0101Metric Values ➢Classes & Tolerances ➢32-UN8813/16 - 32 32-UN0.812320.03130.79170.01690.00780.78360.72°0.77480.0101Metric Values ➢Classes & Tolerances ➢32-UN947/8 - 32 32-UN0.875320.03130.85470.01690.00780.84660.67°0.83780.0101Metric Values ➢Classes & Tolerances ➢32-UN10215/16 - 32 32-UN0.937320.03130.91670.01690.00780.90860.62°0.89980.0101Metric Values ➢Classes & Tolerances ➢32-UN1081 - 32 32-UN1320.03130.97970.01690.00780.97160.58°0.96280.0101Metric Values ➢Classes & Tolerances ➢32-UN1172 1/2 - 4 4-UN2.540.25002.33760.13530.06252.27251.95°2.20230.0812Metric Values ➢Classes & Tolerances ➢4-UN2392 5/8 - 4 4-UN2.62540.25002.46260.13530.06252.39751.85°2.32730.0812Metric Values ➢Classes & Tolerances ➢4-UN2452 3/4 - 4 4-UN2.7540.25002.58760.13530.06252.52251.76°2.45230.0812Metric Values ➢Classes & Tolerances ➢4-UN2522 7/8 - 4 4-UN2.87540.25002.71260.13530.06252.64751.68°2.57730.0812Metric Values ➢Classes & Tolerances ➢4-UN2583 - 4 4-UN340.25002.83760.13530.06252.77251.61°2.70230.0812Metric Values ➢Classes & Tolerances ➢4-UN2653 1/8 - 4 4-UN3.12540.25002.96260.13530.06252.89751.54°2.82730.0812Metric Values ➢Classes & Tolerances ➢4-UN2713 1/4 - 4 4-UN3.2540.25003.08760.13530.06253.02251.48°2.95230.0812Metric Values ➢Classes & Tolerances ➢4-UN2773 3/8 - 4 4-UN3.37540.25003.21260.13530.06253.14751.42°3.07730.0812Metric Values ➢Classes & Tolerances ➢4-UN2823 1/2 - 4 4-UN3.540.25003.33760.13530.06253.27251.37°3.20230.0812Metric Values ➢Classes & Tolerances ➢4-UN2883 5/8 - 4 4-UN3.62540.25003.46260.13530.06253.39751.32°3.32730.0812Metric Values ➢Classes & Tolerances ➢4-UN2933 3/4 - 4 4-UN3.7540.25003.58760.13530.06253.52251.27°3.45230.0812Metric Values ➢Classes & Tolerances ➢4-UN2993 7/8 - 4 4-UN3.87540.25003.71260.13530.06253.64751.23°3.57730.0812Metric Values ➢Classes & Tolerances ➢4-UN3044 - 4 4-UN440.25003.83760.13530.06253.77251.19°3.70230.0812Metric Values ➢Classes & Tolerances ➢4-UN3104 1/8 - 4 4-UN4.12540.25003.96260.13530.06253.89751.15°3.82730.0812Metric Values ➢Classes & Tolerances ➢4-UN3154 1/4 - 4 4-UN4.2540.25004.08760.13530.06254.02251.12°3.95230.0812Metric Values ➢Classes & Tolerances ➢4-UN3204 3/8 - 4 4-UN4.37540.25004.21260.13530.06254.14751.08°4.07730.0812Metric Values ➢Classes & Tolerances ➢4-UN3254 1/2 - 4 4-UN4.540.25004.33760.13530.06254.27251.05°4.20230.0812Metric Values ➢Classes & Tolerances ➢4-UN3304 5/8 - 4 4-UN4.62540.25004.46260.13530.06254.39751.02°4.32730.0812Metric Values ➢Classes & Tolerances ➢4-UN3354 3/4 - 4 4-UN4.7540.25004.58760.13530.06254.52250.99°4.45230.0812Metric Values ➢Classes & Tolerances ➢4-UN3414 7/8 - 4 4-UN4.87540.25004.71260.13530.06254.64750.97°4.57730.0812Metric Values ➢Classes & Tolerances ➢4-UN3465 - 4 4-UN540.25004.83760.13530.06254.77250.94°4.70230.0812Metric Values ➢Classes & Tolerances ➢4-UN3515 1/8 - 4 4-UN5.12540.25004.96260.13530.06254.89750.92°4.82730.0812Metric Values ➢Classes & Tolerances ➢4-UN3565 1/4 - 4 4-UN5.2540.25005.08760.13530.06255.02250.9°4.95230.0812Metric Values ➢Classes & Tolerances ➢4-UN3615 3/8 - 4 4-UN5.37540.25005.21260.13530.06255.14750.87°5.07730.0812Metric Values ➢Classes & Tolerances ➢4-UN3665 1/2 - 4 4-UN5.540.25005.33760.13530.06255.27250.85°5.20230.0812Metric Values ➢Classes & Tolerances ➢4-UN3715 5/8 - 4 4-UN5.62540.25005.46260.13530.06255.39750.83°5.32730.0812Metric Values ➢Classes & Tolerances ➢4-UN3765 3/4 - 4 4-UN5.7540.25005.58760.13530.06255.52250.82°5.45230.0812Metric Values ➢Classes & Tolerances ➢4-UN3815 7/8 - 4 4-UN5.87540.25005.71260.13530.06255.64750.8°5.57730.0812Metric Values ➢Classes & Tolerances ➢4-UN3866 - 4 4-UN640.25005.83760.13530.06255.77250.78°5.70230.0812Metric Values ➢Classes & Tolerances ➢4-UN3911 3/8 - 6 6-UN1.37560.16671.26670.09020.04171.22332.4°1.17650.0541Metric Values ➢Classes & Tolerances ➢6-UN1551 7/16 - 6 6-UN1.43760.16671.32870.09020.04171.28532.29°1.23850.0541Metric Values ➢Classes & Tolerances ➢6-UN1621 1/2 - 6 6-UN1.560.16671.39170.09020.04171.34832.18°1.30150.0541Metric Values ➢Classes & Tolerances ➢6-UN1711 9/16 - 6 6-UN1.56260.16671.45370.09020.04171.41032.09°1.36350.0541Metric Values ➢Classes & Tolerances ➢6-UN1781 5/8 - 6 6-UN1.62560.16671.51670.09020.04171.47332°1.42650.0541Metric Values ➢Classes & Tolerances ➢6-UN1841 11/16 - 6 6-UN1.68760.16671.57870.09020.04171.53531.92°1.48850.0541Metric Values ➢Classes & Tolerances ➢6-UN1901 3/4 - 6 6-UN1.7560.16671.64170.09020.04171.59831.85°1.55150.0541Metric Values ➢Classes & Tolerances ➢6-UN1961 13/16 - 6 6-UN1.81260.16671.70370.09020.04171.66031.78°1.61350.0541Metric Values ➢Classes & Tolerances ➢6-UN2011 7/8 - 6 6-UN1.87560.16671.76670.09020.04171.72331.72°1.67650.0541Metric Values ➢Classes & Tolerances ➢6-UN2061 15/16 - 6 6-UN1.93760.16671.82870.09020.04171.78531.66°1.73850.0541Metric Values ➢Classes & Tolerances ➢6-UN2112 - 6 6-UN260.16671.89170.09020.04171.84831.61°1.80150.0541Metric Values ➢Classes & Tolerances ➢6-UN2172 1/8 - 6 6-UN2.12560.16672.01670.09020.04171.97331.51°1.92650.0541Metric Values ➢Classes & Tolerances ➢6-UN2222 1/4 - 6 6-UN2.2560.16672.14170.09020.04172.09831.42°2.05150.0541Metric Values ➢Classes & Tolerances ➢6-UN2282 3/8 - 6 6-UN2.37560.16672.26670.09020.04172.22331.34°2.17650.0541Metric Values ➢Classes & Tolerances ➢6-UN2332 1/2 - 6 6-UN2.560.16672.39170.09020.04172.34831.27°2.30150.0541Metric Values ➢Classes & Tolerances ➢6-UN2402 5/8 - 6 6-UN2.62560.16672.51670.09020.04172.47331.21°2.42650.0541Metric Values ➢Classes & Tolerances ➢6-UN2462 3/4 - 6 6-UN2.7560.16672.64170.09020.04172.59831.15°2.55150.0541Metric Values ➢Classes & Tolerances ➢6-UN2532 7/8 - 6 6-UN2.87560.16672.76670.09020.04172.72331.1°2.67650.0541Metric Values ➢Classes & Tolerances ➢6-UN2593 - 6 6-UN360.16672.89170.09020.04172.84831.05°2.80150.0541Metric Values ➢Classes & Tolerances ➢6-UN2663 1/8 - 6 6-UN3.12560.16673.01670.09020.04172.97331.01°2.92650.0541Metric Values ➢Classes & Tolerances ➢6-UN2723 1/4 - 6 6-UN3.2560.16673.14170.09020.04173.09830.97°3.05150.0541Metric Values ➢Classes & Tolerances ➢6-UN2783 3/8 - 6 6-UN3.37560.16673.26670.09020.04173.22330.93°3.17650.0541Metric Values ➢Classes & Tolerances ➢6-UN2833 1/2 - 6 6-UN3.560.16673.39170.09020.04173.34830.9°3.30150.0541Metric Values ➢Classes & Tolerances ➢6-UN2893 5/8 - 6 6-UN3.62560.16673.51670.09020.04173.47330.86°3.42650.0541Metric Values ➢Classes & Tolerances ➢6-UN2943 3/4 - 6 6-UN3.7560.16673.64170.09020.04173.59830.83°3.55150.0541Metric Values ➢Classes & Tolerances ➢6-UN3003 7/8 - 6 6-UN3.87560.16673.76670.09020.04173.72330.81°3.67650.0541Metric Values ➢Classes & Tolerances ➢6-UN3054 - 6 6-UN460.16673.89170.09020.04173.84830.78°3.80150.0541Metric Values ➢Classes & Tolerances ➢6-UN3114 1/8 - 6 6-UN4.12560.16674.01670.09020.04173.97330.76°3.92650.0541Metric Values ➢Classes & Tolerances ➢6-UN3164 1/4 - 6 6-UN4.2560.16674.14170.09020.04174.09830.73°4.05150.0541Metric Values ➢Classes & Tolerances ➢6-UN3214 3/8 - 6 6-UN4.37560.16674.26670.09020.04174.22330.71°4.17650.0541Metric Values ➢Classes & Tolerances ➢6-UN3264 1/2 - 6 6-UN4.560.16674.39170.09020.04174.34830.69°4.30150.0541Metric Values ➢Classes & Tolerances ➢6-UN3314 5/8 - 6 6-UN4.62560.16674.51670.09020.04174.47330.67°4.42650.0541Metric Values ➢Classes & Tolerances ➢6-UN3364 3/4 - 6 6-UN4.7560.16674.64170.09020.04174.59830.65°4.55150.0541Metric Values ➢Classes & Tolerances ➢6-UN3424 7/8 - 6 6-UN4.87560.16674.76670.09020.04174.72330.64°4.67650.0541Metric Values ➢Classes & Tolerances ➢6-UN3475 - 6 6-UN560.16674.89170.09020.04174.84830.62°4.80150.0541Metric Values ➢Classes & Tolerances ➢6-UN3525 1/8 - 6 6-UN5.12560.16675.01670.09020.04174.97330.61°4.92650.0541Metric Values ➢Classes & Tolerances ➢6-UN3575 1/4 - 6 6-UN5.2560.16675.14170.09020.04175.09830.59°5.05150.0541Metric Values ➢Classes & Tolerances ➢6-UN3625 3/8 - 6 6-UN5.37560.16675.26670.09020.04175.22330.58°5.17650.0541Metric Values ➢Classes & Tolerances ➢6-UN3675 1/2 - 6 6-UN5.560.16675.39170.09020.04175.34830.56°5.30150.0541Metric Values ➢Classes & Tolerances ➢6-UN3725 5/8 - 6 6-UN5.62560.16675.51670.09020.04175.47330.55°5.42650.0541Metric Values ➢Classes & Tolerances ➢6-UN3775 3/4 - 6 6-UN5.7560.16675.64170.09020.04175.59830.54°5.55150.0541Metric Values ➢Classes & Tolerances ➢6-UN3825 7/8 - 6 6-UN5.87560.16675.76670.09020.04175.72330.53°5.67650.0541Metric Values ➢Classes & Tolerances ➢6-UN3876 - 6 6-UN660.16675.89170.09020.04175.84830.52°5.80150.0541Metric Values ➢Classes & Tolerances ➢6-UN3921 - 8 8-UN180.12500.91880.06770.03130.88632.48°0.85120.0406Metric Values ➢Classes & Tolerances ➢8-UN1121 1/16 - 8 8-UN1.06280.12500.98080.06770.03130.94832.32°0.91320.0406Metric Values ➢Classes & Tolerances ➢8-UN1191 1/8 - 8 8-UN1.12580.12501.04380.06770.03131.01132.18°0.97620.0406Metric Values ➢Classes & Tolerances ➢8-UN1271 3/16 - 8 8-UN1.18780.12501.10580.06770.03131.07332.06°1.03820.0406Metric Values ➢Classes & Tolerances ➢8-UN1331 1/4 - 8 8-UN1.2580.12501.16880.06770.03131.13631.95°1.10120.0406Metric Values ➢Classes & Tolerances ➢8-UN1411 5/16 - 8 8-UN1.31280.12501.23080.06770.03131.19831.85°1.16320.0406Metric Values ➢Classes & Tolerances ➢8-UN1471 3/8 - 8 8-UN1.37580.12501.29380.06770.03131.26131.76°1.22620.0406Metric Values ➢Classes & Tolerances ➢8-UN1561 7/16 - 8 8-UN1.43780.12501.35580.06770.03131.32331.68°1.28820.0406Metric Values ➢Classes & Tolerances ➢8-UN1631 1/2 - 8 8-UN1.580.12501.41880.06770.03131.38631.61°1.35120.0406Metric Values ➢Classes & Tolerances ➢8-UN1721 9/16 - 8 8-UN1.56280.12501.48080.06770.03131.44831.54°1.41320.0406Metric Values ➢Classes & Tolerances ➢8-UN1791 5/8 - 8 8-UN1.62580.12501.54380.06770.03131.51131.48°1.47620.0406Metric Values ➢Classes & Tolerances ➢8-UN1851 11/16 - 8 8-UN1.68780.12501.60580.06770.03131.57331.42°1.53820.0406Metric Values ➢Classes & Tolerances ➢8-UN1911 3/4 - 8 8-UN1.7580.12501.66880.06770.03131.63631.37°1.60120.0406Metric Values ➢Classes & Tolerances ➢8-UN1971 13/16 - 8 8-UN1.81280.12501.73080.06770.03131.69831.32°1.66320.0406Metric Values ➢Classes & Tolerances ➢8-UN2021 7/8 - 8 8-UN1.87580.12501.79380.06770.03131.76131.27°1.72620.0406Metric Values ➢Classes & Tolerances ➢8-UN2071 15/16 - 8 8-UN1.93780.12501.85580.06770.03131.82331.23°1.78820.0406Metric Values ➢Classes & Tolerances ➢8-UN2122 - 8 8-UN280.12501.91880.06770.03131.88631.19°1.85120.0406Metric Values ➢Classes & Tolerances ➢8-UN2182 1/8 - 8 8-UN2.12580.12502.04380.06770.03132.01131.12°1.97620.0406Metric Values ➢Classes & Tolerances ➢8-UN2232 1/4 - 8 8-UN2.2580.12502.16880.06770.03132.13631.05°2.10120.0406Metric Values ➢Classes & Tolerances ➢8-UN2292 3/8 - 8 8-UN2.37580.12502.29380.06770.03132.26130.99°2.22620.0406Metric Values ➢Classes & Tolerances ➢8-UN2342 1/2 - 8 8-UN2.580.12502.41880.06770.03132.38630.94°2.35120.0406Metric Values ➢Classes & Tolerances ➢8-UN2412 5/8 - 8 8-UN2.62580.12502.54380.06770.03132.51130.9°2.47620.0406Metric Values ➢Classes & Tolerances ➢8-UN2472 3/4 - 8 8-UN2.7580.12502.66880.06770.03132.63630.85°2.60120.0406Metric Values ➢Classes & Tolerances ➢8-UN2542 7/8 - 8 8-UN2.87580.12502.79380.06770.03132.76130.82°2.72620.0406Metric Values ➢Classes & Tolerances ➢8-UN2603 - 8 8-UN380.12502.91880.06770.03132.88630.78°2.85120.0406Metric Values ➢Classes & Tolerances ➢8-UN2673 1/8 - 8 8-UN3.12580.12503.04380.06770.03133.01130.75°2.97620.0406Metric Values ➢Classes & Tolerances ➢8-UN2733 1/4 - 8 8-UN3.2580.12503.16880.06770.03133.13630.72°3.10120.0406Metric Values ➢Classes & Tolerances ➢8-UN2793 3/8 - 8 8-UN3.37580.12503.29380.06770.03133.26130.69°3.22620.0406Metric Values ➢Classes & Tolerances ➢8-UN2843 1/2 - 8 8-UN3.580.12503.41880.06770.03133.38630.67°3.35120.0406Metric Values ➢Classes & Tolerances ➢8-UN2903 5/8 - 8 8-UN3.62580.12503.54380.06770.03133.51130.64°3.47620.0406Metric Values ➢Classes & Tolerances ➢8-UN2953 3/4 - 8 8-UN3.7580.12503.66880.06770.03133.63630.62°3.60120.0406Metric Values ➢Classes & Tolerances ➢8-UN3013 7/8 - 8 8-UN3.87580.12503.79380.06770.03133.76130.6°3.72620.0406Metric Values ➢Classes & Tolerances ➢8-UN3064 - 8 8-UN480.12503.91880.06770.03133.88630.58°3.85120.0406Metric Values ➢Classes & Tolerances ➢8-UN3124 1/8 - 8 8-UN4.12580.12504.04380.06770.03134.01130.56°3.97620.0406Metric Values ➢Classes & Tolerances ➢8-UN3174 1/4 - 8 8-UN4.2580.12504.16880.06770.03134.13630.55°4.10120.0406Metric Values ➢Classes & Tolerances ➢8-UN3224 3/8 - 8 8-UN4.37580.12504.29380.06770.03134.26130.53°4.22620.0406Metric Values ➢Classes & Tolerances ➢8-UN3274 1/2 - 8 8-UN4.580.12504.41880.06770.03134.38630.52°4.35120.0406Metric Values ➢Classes & Tolerances ➢8-UN3324 5/8 - 8 8-UN4.62580.12504.54380.06770.03134.51130.5°4.47620.0406Metric Values ➢Classes & Tolerances ➢8-UN3374 3/4 - 8 8-UN4.7580.12504.66880.06770.03134.63630.49°4.60120.0406Metric Values ➢Classes & Tolerances ➢8-UN3434 7/8 - 8 8-UN4.87580.12504.79380.06770.03134.76130.48°4.72620.0406Metric Values ➢Classes & Tolerances ➢8-UN3485 - 8 8-UN580.12504.91880.06770.03134.88630.46°4.85120.0406Metric Values ➢Classes & Tolerances ➢8-UN3535 1/8 - 8 8-UN5.12580.12505.04380.06770.03135.01130.45°4.97620.0406Metric Values ➢Classes & Tolerances ➢8-UN3585 1/4 - 8 8-UN5.2580.12505.16880.06770.03135.13630.44°5.10120.0406Metric Values ➢Classes & Tolerances ➢8-UN3635 3/8 - 8 8-UN5.37580.12505.29380.06770.03135.26130.43°5.22620.0406Metric Values ➢Classes & Tolerances ➢8-UN3685 1/2 - 8 8-UN5.580.12505.41880.06770.03135.38630.42°5.35120.0406Metric Values ➢Classes & Tolerances ➢8-UN3735 5/8 - 8 8-UN5.62580.12505.54380.06770.03135.51130.41°5.47620.0406Metric Values ➢Classes & Tolerances ➢8-UN3785 3/4 - 8 8-UN5.7580.12505.66880.06770.03135.63630.4°5.60120.0406Metric Values ➢Classes & Tolerances ➢8-UN3835 7/8 - 8 8-UN5.87580.12505.79380.06770.03135.76130.39°5.72620.0406Metric Values ➢Classes & Tolerances ➢8-UN3886 - 8 8-UN680.12505.91880.06770.03135.88630.39°5.85120.0406Metric Values ➢Classes & Tolerances ➢8-UN393limits of Thread Dimensions (UNC, UNF & UNEF)To manufacture or measure a thread, one has to know the maximum and minimum permissible values of the basic dimensions. These values are calculated according to the thread class (See below). To understand classes, you first need to understand the terms Allowance (Sometimes referred to as deviation) and Tolerances.Definition of terms:Allowance (Deviation): The minimum permissible distance between the basic and actual profile.Tolerance: The width of the tolerance field of a diameter on the actual thread profile. (Pitch, Major & Minor diameters)A small allowance means that the assembly of a male and female thread will be harder, but after assembly, there will be less freedom of movement.A large allowance means that the assembly of a male and female thread will be easier, but after assembly, there will be more freedom of movement.The allowance size does not influence a thread’s production difficulty or price.A wide tolerance is easier and cheaper to produce but yields a larger spread between threads.A narrow tolerance is challenging to produce and more expensive but yields a smaller spread between threads.Unified Thread ClassesThe class is defined by a two-character code.The first character defines is a digit between 1 and 3. 1=Loose fit, 2=Medium fit, and 3=Tight fit.The second character is a letter. A=External thread and B=Internal thread.In the Unified Inch thread system, only classes 1A & 2A have an allowance. The allowance for the two classes is the same.The other 4 classes have an allowance of Zero.All the internal thread profiles (B classes) have no allowance.Classes 1A & 1B: These classes are suitable for applications where a liberal tolerance and allowance are required to permit easy assembly. The maximum diameters of Class 1A threads are smaller than the basic diameter by the allowance amount. The minimum diameters of Class 1B threads are equal to the basic diameters and consequently afford no allowance at maximum material condition.Classes 2A & 2B: Classes 2A (external) and 2B (internal) are the default classes used for the commercial production of Nut, Bols, and otehr threaded fasteners. They are the default class unless otherwise specified. they have the same allowance as classes 1A/1B. However, they have a narrower tolerance field. The difficulty of assembly is the same, but the spread between different parts in a production batch is smaller.Classes 3A & 3B: These classes are suitable for applications where tight fit and accuracy of thread elements are essential. The maximum diameters of Class 3A threads and the minimum diameters of Class 3B threads are the same (Both have zero allowance). The accuracy is high, but the assembly is difficult.Combinations of Classes: The engineer can select any valid class for the male and female threads to achieve his design goals. The valid classes are defined in ASTM B1.1 as follows:Classes 2A, 2A, 3B, and 3B are always valid.Classes 1A & 1B are valid only for UNC threads with a nominal diameter equal to or larger than 1/4″.Unified Thread Allowance.The allowance es should be calculated for external threads with classes 1A and 2A. The allowance of both classes is the same and equals 0.3 times the pitch diameter tolerance of class 2A. It is the function of 3 parameters.D – Basic (nominal diameter)P – Pitch (1/TPI)LE – Length of engagement. If not explicitly specified, the length of engagement is assumed to be 5 pitches. (LE=5*P)All parameters are in inches$ \large es = 0.3 \times \left [ 0.0015 \times \sqrt[3]{D} + 0.0015 \times \sqrt{LE} + 0.015 \times \sqrt[3]{P^{2}} \right ] $\begin{array} \large \,es& = 0.3 \times\,[\,0.0015 \times \sqrt[3]{D} &\\ & +\,0.0015 \times \sqrt{LE}&\\ & + 0.015 \times \sqrt[3]{P^{2}}\,] \end{array}The result should be rounded to 6 decimal places.ASTM B1.1 lists in a long chart the allowance for each thread size. However, the results of this formula are 100% accurate, and there is no need to browse the chart.You can use our Advanced Threading Calculator to obtain the allowance according to a thread description or use the mini-calculator below.Unified Thread Allowance CalculatorPayment options Unified Thread TolerancesThe tolerances TD for internal threads and Td for external threads are derived from the class. The tolerances can be calculated according to the below formulas.Td – Tolerance for External Major DiameterTd2 – Tolerance for External Pitch DiameterTD1 – Tolerance for Internal Minor DiameterTD2 – Tolerance for Internal Pitch DiameterT – Base Tolerance (The tolerance of CLASS 2A pitch diameter is the base tolerance from which other tolerances are derived)D – Basic thread diameter.P – Pitch (1/TPI).LE – Length of engagement. (If unknown, the default is 5 * P)All input parameters and results are in Inches.Base Tolerance Formula$ \large T = 0.0015 \times \sqrt[3]{D} + 0.0015 \times \sqrt{LE} + 0.015 \times \sqrt[3]{P^{2}}$\begin{array} \large \,T& = \,0.0015 \times \sqrt[3]{D} &\\ & +\,0.0015 \times \sqrt{LE}&\\ & + 0.015 \times \sqrt[3]{P^{2}} \end{array}Formulas for External thread(Classes 1A,2A & 3A)$ \large T_{d(1A)} = 0.3 \times T $$ \large T_{d2(1A)} = 1.5 \times T $$ \large T_{d(2A)} = 0.06 \times \sqrt[3]{P^2} $$ \large T_{d2(2A)} = T $$ \large T_{d(3A)} = 0.06 \times \sqrt[3]{P^2} $$ \large T_{d2(3A)} = 0.75 \times T $Formulas for Internal Thread(Classes 1B,2B & 3B)$ \large T_{d1(1B)} = 0.25 \times P\,-\,0.4 \times P^{2} $$ \large T_{d2(1B)} = 1.95 \times T $$ \large T_{d1(2B)} = 0.25 \times P\,-\,0.4 \times P^{2} $$ \large T_{d2(2B)} = 1.30 \times T $$\begin{array}{ll} \large T_{d1(3B)}=&0.05 \times \sqrt[3]{P} + &\\ &0.003 \times \frac{P}{D}\,-\,0.002 \end{array} $$ \large T_{d2(3B)} = 0.975 \times T $The above formulas can be used in most cases. However, ASTM B1.1 lists various scenarios where other formulas or quirky rounding rules apply. Use our Advanced Threading Calculator to get exact results for any thread.Usage notes for the above formulas:The result should be rounded to 6 decimal places.Formulas for external threads are valid for all threads.Formulas for internal threads are valid only for thread diameters above 1/4″, a pitch between 4 and 80 TPI, and engagement lengths up to 1.5 X D.In some cases, ASTM B1.1 dictates special rounding rules.You can use the Threading Calculator, which automatically considers all the above rules.Unified Thread limits CalculationsOnce the Td, TD, & es values are known, the final limits can be calculated according to the formulas below.Formulas for Limits of a Unified Inch External Thread$ \large d_{max}=d-{es} $$ \large d_{min}=d_{max}-T_d $$ \large d_{2max} = d2 – es $$ \large d_{2min}=d_{2max}-T_{d2} $Formulas for Limits of a Unified Inch InternalThread$ \large D_{1min}=D $$ \large D_{1max}=D_{1min}+T_{D1} $$ \large D_{2minx} = D_2 $$ \large D_{2max}=D_{2min}+ T_{D2} $Related Glossary Terms:PitchThread Allowance (es)Major DiameterTooth per inch (tpi)Lead (Threading)Minor DiameterPitch DiameterFundamental TriangleThread Height (Depth)Thread addendumTap Drill SizeMaximum material condition (MMC)Length of Engagement

Once the Td, TD, & es values are known, the final limits can be calculated according to the formulas below.Formulas for Limits of a Unified Inch External Thread$ \large d_{max}=d-{es} $$ \large d_{min}=d_{max}-T_d $$ \large d_{2max} = d2 – es $$ \large d_{2min}=d_{2max}-T_{d2} $Formulas for Limits of a Unified Inch InternalThread$ \large D_{1min}=D $$ \large D_{1max}=D_{1min}+T_{D1} $$ \large D_{2minx} = D_2 $$ \large D_{2max}=D_{2min}+ T_{D2} $Related Glossary Terms:PitchThread Allowance (es)Major DiameterTooth per inch (tpi)Lead (Threading)Minor DiameterPitch DiameterFundamental TriangleThread Height (Depth)Thread addendumTap Drill SizeMaximum material condition (MMC)Length of Engagement

Click icon to show Full Thread DataThreadBasic DiamTPIPitchPitch DiamThread HeightCres/ RootTap Drill SizeLead AngleMinor DiameterThread addendumseriesid9/16 - 12 12-UN0.562120.08330.50790.04510.02080.48622.99°0.46280.0271Metric Values ➢Classes & Tolerances ➢12-UN625/8 - 12 12-UN0.625120.08330.57090.04510.02080.54922.66°0.52580.0271Metric Values ➢Classes & Tolerances ➢12-UN7011/16 - 12 12-UN0.687120.08330.63290.04510.02080.61122.4°0.58780.0271Metric Values ➢Classes & Tolerances ➢12-UN763/4 - 12 12-UN0.75120.08330.69590.04510.02080.67422.18°0.65080.0271Metric Values ➢Classes & Tolerances ➢12-UN8413/16 - 12 12-UN0.812120.08330.75790.04510.02080.73622°0.71280.0271Metric Values ➢Classes & Tolerances ➢12-UN907/8 - 12 12-UN0.875120.08330.82090.04510.02080.79921.85°0.77580.0271Metric Values ➢Classes & Tolerances ➢12-UN9815/16 - 12 12-UN0.937120.08330.88290.04510.02080.86121.72°0.83780.0271Metric Values ➢Classes & Tolerances ➢12-UN1041 - 12 12-UN1120.08330.94590.04510.02080.92421.61°0.90080.0271Metric Values ➢Classes & Tolerances ➢12-UN1131 1/16 - 12 12-UN1.062120.08331.00790.04510.02080.98621.51°0.96280.0271Metric Values ➢Classes & Tolerances ➢12-UN1201 1/8 - 12 12-UN1.125120.08331.07090.04510.02081.04921.42°1.02580.0271Metric Values ➢Classes & Tolerances ➢12-UN1281 3/16 - 12 12-UN1.187120.08331.13290.04510.02081.11121.34°1.08780.0271Metric Values ➢Classes & Tolerances ➢12-UN1341 1/4 - 12 12-UN1.25120.08331.19590.04510.02081.17421.27°1.15080.0271Metric Values ➢Classes & Tolerances ➢12-UN1421 5/16 - 12 12-UN1.312120.08331.25790.04510.02081.23621.21°1.21280.0271Metric Values ➢Classes & Tolerances ➢12-UN1481 3/8 - 12 12-UN1.375120.08331.32090.04510.02081.29921.15°1.27580.0271Metric Values ➢Classes & Tolerances ➢12-UN1571 7/16 - 12 12-UN1.437120.08331.38290.04510.02081.36121.1°1.33780.0271Metric Values ➢Classes & Tolerances ➢12-UN1641 1/2 - 12 12-UN1.5120.08331.44590.04510.02081.42421.05°1.40080.0271Metric Values ➢Classes & Tolerances ➢12-UN1731 9/16 - 12 12-UN1.562120.08331.50790.04510.02081.48621.01°1.46280.0271Metric Values ➢Classes & Tolerances ➢12-UN1801 5/8 - 12 12-UN1.625120.08331.57090.04510.02081.54920.97°1.52580.0271Metric Values ➢Classes & Tolerances ➢12-UN1861 11/16 - 12 12-UN1.687120.08331.63290.04510.02081.61120.93°1.58780.0271Metric Values ➢Classes & Tolerances ➢12-UN1921 3/4 - 12 12-UN1.75120.08331.69590.04510.02081.67420.9°1.65080.0271Metric Values ➢Classes & Tolerances ➢12-UN1981 13/16 - 12 12-UN1.812120.08331.75790.04510.02081.73620.86°1.71280.0271Metric Values ➢Classes & Tolerances ➢12-UN2031 7/8 - 12 12-UN1.875120.08331.82090.04510.02081.79920.83°1.77580.0271Metric Values ➢Classes & Tolerances ➢12-UN2081 15/16 - 12 12-UN1.937120.08331.88290.04510.02081.86120.81°1.83780.0271Metric Values ➢Classes & Tolerances ➢12-UN2132 - 12 12-UN2120.08331.94590.04510.02081.92420.78°1.90080.0271Metric Values ➢Classes & Tolerances ➢12-UN2192 1/8 - 12 12-UN2.125120.08332.07090.04510.02082.04920.73°2.02580.0271Metric Values ➢Classes & Tolerances ➢12-UN2242 1/4 - 12 12-UN2.25120.08332.19590.04510.02082.17420.69°2.15080.0271Metric Values ➢Classes & Tolerances ➢12-UN2302 3/8 - 12 12-UN2.375120.08332.32090.04510.02082.29920.65°2.27580.0271Metric Values ➢Classes & Tolerances ➢12-UN2352 1/2 - 12 12-UN2.5120.08332.44590.04510.02082.42420.62°2.40080.0271Metric Values ➢Classes & Tolerances ➢12-UN2422 5/8 - 12 12-UN2.625120.08332.57090.04510.02082.54920.59°2.52580.0271Metric Values ➢Classes & Tolerances ➢12-UN2482 3/4 - 12 12-UN2.75120.08332.69590.04510.02082.67420.56°2.65080.0271Metric Values ➢Classes & Tolerances ➢12-UN2552 7/8 - 12 12-UN2.875120.08332.82090.04510.02082.79920.54°2.77580.0271Metric Values ➢Classes & Tolerances ➢12-UN2613 - 12 12-UN3120.08332.94590.04510.02082.92420.52°2.90080.0271Metric Values ➢Classes & Tolerances ➢12-UN2683 1/8 - 12 12-UN3.125120.08333.07090.04510.02083.04920.49°3.02580.0271Metric Values ➢Classes & Tolerances ➢12-UN2743 1/4 - 12 12-UN3.25120.08333.19590.04510.02083.17420.48°3.15080.0271Metric Values ➢Classes & Tolerances ➢12-UN2803 3/8 - 12 12-UN3.375120.08333.32090.04510.02083.29920.46°3.27580.0271Metric Values ➢Classes & Tolerances ➢12-UN2853 1/2 - 12 12-UN3.5120.08333.44590.04510.02083.42420.44°3.40080.0271Metric Values ➢Classes & Tolerances ➢12-UN2913 5/8 - 12 12-UN3.625120.08333.57090.04510.02083.54920.43°3.52580.0271Metric Values ➢Classes & Tolerances ➢12-UN2963 3/4 - 12 12-UN3.75120.08333.69590.04510.02083.67420.41°3.65080.0271Metric Values ➢Classes & Tolerances ➢12-UN3023 7/8 - 12 12-UN3.875120.08333.82090.04510.02083.79920.4°3.77580.0271Metric Values ➢Classes & Tolerances ➢12-UN3074 - 12 12-UN4120.08333.94590.04510.02083.92420.39°3.90080.0271Metric Values ➢Classes & Tolerances ➢12-UN3134 1/8 - 12 12-UN4.125120.08334.07090.04510.02084.04920.37°4.02580.0271Metric Values ➢Classes & Tolerances ➢12-UN3184 1/4 - 12 12-UN4.25120.08334.19590.04510.02084.17420.36°4.15080.0271Metric Values ➢Classes & Tolerances ➢12-UN3234 3/8 - 12 12-UN4.375120.08334.32090.04510.02084.29920.35°4.27580.0271Metric Values ➢Classes & Tolerances ➢12-UN3284 1/2 - 12 12-UN4.5120.08334.44590.04510.02084.42420.34°4.40080.0271Metric Values ➢Classes & Tolerances ➢12-UN3334 5/8 - 12 12-UN4.625120.08334.57090.04510.02084.54920.33°4.52580.0271Metric Values ➢Classes & Tolerances ➢12-UN3384 3/4 - 12 12-UN4.75120.08334.69590.04510.02084.67420.32°4.65080.0271Metric Values ➢Classes & Tolerances ➢12-UN3444 7/8 - 12 12-UN4.875120.08334.82090.04510.02084.79920.32°4.77580.0271Metric Values ➢Classes & Tolerances ➢12-UN3495 - 12 12-UN5120.08334.94590.04510.02084.92420.31°4.90080.0271Metric Values ➢Classes & Tolerances ➢12-UN3545 1/8 - 12 12-UN5.125120.08335.07090.04510.02085.04920.3°5.02580.0271Metric Values ➢Classes & Tolerances ➢12-UN3595 1/4 - 12 12-UN5.25120.08335.19590.04510.02085.17420.29°5.15080.0271Metric Values ➢Classes & Tolerances ➢12-UN3645 3/8 - 12 12-UN5.375120.08335.32090.04510.02085.29920.29°5.27580.0271Metric Values ➢Classes & Tolerances ➢12-UN3695 1/2 - 12 12-UN5.5120.08335.44590.04510.02085.42420.28°5.40080.0271Metric Values ➢Classes & Tolerances ➢12-UN3745 5/8 - 12 12-UN5.625120.08335.57090.04510.02085.54920.27°5.52580.0271Metric Values ➢Classes & Tolerances ➢12-UN3795 3/4 - 12 12-UN5.75120.08335.69590.04510.02085.67420.27°5.65080.0271Metric Values ➢Classes & Tolerances ➢12-UN3845 7/8 - 12 12-UN5.875120.08335.82090.04510.02085.79920.26°5.77580.0271Metric Values ➢Classes & Tolerances ➢12-UN3896 - 12 12-UN6120.08335.94590.04510.02085.92420.26°5.90080.0271Metric Values ➢Classes & Tolerances ➢12-UN3943/8 - 16 16-UN0.375160.06250.33440.03380.01560.31813.4°0.30060.0203Metric Values ➢Classes & Tolerances ➢16-UN417/16 - 16 16-UN0.437160.06250.39640.03380.01560.38012.87°0.36260.0203Metric Values ➢Classes & Tolerances ➢16-UN481/2 - 16 16-UN0.5160.06250.45940.03380.01560.44312.48°0.42560.0203Metric Values ➢Classes & Tolerances ➢16-UN559/16 - 16 16-UN0.562160.06250.52140.03380.01560.50512.19°0.48760.0203Metric Values ➢Classes & Tolerances ➢16-UN635/8 - 16 16-UN0.625160.06250.58440.03380.01560.56811.95°0.55060.0203Metric Values ➢Classes & Tolerances ➢16-UN7111/16 - 16 16-UN0.687160.06250.64640.03380.01560.63011.76°0.61260.0203Metric Values ➢Classes & Tolerances ➢16-UN773/4 - 16 16-UN0.75160.06250.70940.03380.01560.69311.61°0.67560.0203Metric Values ➢Classes & Tolerances ➢16-UN8513/16 - 16 16-UN0.812160.06250.77140.03380.01560.75511.48°0.73760.0203Metric Values ➢Classes & Tolerances ➢16-UN917/8 - 16 16-UN0.875160.06250.83440.03380.01560.81811.37°0.80060.0203Metric Values ➢Classes & Tolerances ➢16-UN9915/16 - 16 16-UN0.937160.06250.89640.03380.01560.88011.27°0.86260.0203Metric Values ➢Classes & Tolerances ➢16-UN1051 - 16 16-UN1160.06250.95940.03380.01560.94311.19°0.92560.0203Metric Values ➢Classes & Tolerances ➢16-UN1141 1/16 - 16 16-UN1.062160.06251.02140.03380.01561.00511.12°0.98760.0203Metric Values ➢Classes & Tolerances ➢16-UN1211 1/8 - 16 16-UN1.125160.06251.08440.03380.01561.06811.05°1.05060.0203Metric Values ➢Classes & Tolerances ➢16-UN1291 3/16 - 16 16-UN1.187160.06251.14640.03380.01561.13010.99°1.11260.0203Metric Values ➢Classes & Tolerances ➢16-UN1351 1/4 - 16 16-UN1.25160.06251.20940.03380.01561.19310.94°1.17560.0203Metric Values ➢Classes & Tolerances ➢16-UN1431 5/16 - 16 16-UN1.312160.06251.27140.03380.01561.25510.9°1.23760.0203Metric Values ➢Classes & Tolerances ➢16-UN1491 3/8 - 16 16-UN1.375160.06251.33440.03380.01561.31810.85°1.30060.0203Metric Values ➢Classes & Tolerances ➢16-UN1581 7/16 - 16 16-UN1.437160.06251.39640.03380.01561.38010.82°1.36260.0203Metric Values ➢Classes & Tolerances ➢16-UN1651 1/2 - 16 16-UN1.5160.06251.45940.03380.01561.44310.78°1.42560.0203Metric Values ➢Classes & Tolerances ➢16-UN1741 9/16 - 16 16-UN1.562160.06251.52140.03380.01561.50510.75°1.48760.0203Metric Values ➢Classes & Tolerances ➢16-UN1811 5/8 - 16 16-UN1.625160.06251.58440.03380.01561.56810.72°1.55060.0203Metric Values ➢Classes & Tolerances ➢16-UN1871 11/16 - 16 16-UN1.687160.06251.64640.03380.01561.63010.69°1.61260.0203Metric Values ➢Classes & Tolerances ➢16-UN1931 3/4 - 16 16-UN1.75160.06251.70940.03380.01561.69310.67°1.67560.0203Metric Values ➢Classes & Tolerances ➢16-UN1991 13/16 - 16 16-UN1.812160.06251.77140.03380.01561.75510.64°1.73760.0203Metric Values ➢Classes & Tolerances ➢16-UN2041 7/8 - 16 16-UN1.875160.06251.83440.03380.01561.81810.62°1.80060.0203Metric Values ➢Classes & Tolerances ➢16-UN2091 15/16 - 16 16-UN1.937160.06251.89640.03380.01561.88010.6°1.86260.0203Metric Values ➢Classes & Tolerances ➢16-UN2142 - 16 16-UN2160.06251.95940.03380.01561.94310.58°1.92560.0203Metric Values ➢Classes & Tolerances ➢16-UN2202 1/8 - 16 16-UN2.125160.06252.08440.03380.01562.06810.55°2.05060.0203Metric Values ➢Classes & Tolerances ➢16-UN2252 1/4 - 16 16-UN2.25160.06252.20940.03380.01562.19310.52°2.17560.0203Metric Values ➢Classes & Tolerances ➢16-UN2312 3/8 - 16 16-UN2.375160.06252.33440.03380.01562.31810.49°2.30060.0203Metric Values ➢Classes & Tolerances ➢16-UN2362 1/2 - 16 16-UN2.5160.06252.45940.03380.01562.44310.46°2.42560.0203Metric Values ➢Classes & Tolerances ➢16-UN2432 5/8 - 16 16-UN2.625160.06252.58440.03380.01562.56810.44°2.55060.0203Metric Values ➢Classes & Tolerances ➢16-UN2492 3/4 - 16 16-UN2.75160.06252.70940.03380.01562.69310.42°2.67560.0203Metric Values ➢Classes & Tolerances ➢16-UN2562 7/8 - 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4 4-UN5.7540.25005.58760.13530.06255.52250.82°5.45230.0812Metric Values ➢Classes & Tolerances ➢4-UN3815 7/8 - 4 4-UN5.87540.25005.71260.13530.06255.64750.8°5.57730.0812Metric Values ➢Classes & Tolerances ➢4-UN3866 - 4 4-UN640.25005.83760.13530.06255.77250.78°5.70230.0812Metric Values ➢Classes & Tolerances ➢4-UN3911 3/8 - 6 6-UN1.37560.16671.26670.09020.04171.22332.4°1.17650.0541Metric Values ➢Classes & Tolerances ➢6-UN1551 7/16 - 6 6-UN1.43760.16671.32870.09020.04171.28532.29°1.23850.0541Metric Values ➢Classes & Tolerances ➢6-UN1621 1/2 - 6 6-UN1.560.16671.39170.09020.04171.34832.18°1.30150.0541Metric Values ➢Classes & Tolerances ➢6-UN1711 9/16 - 6 6-UN1.56260.16671.45370.09020.04171.41032.09°1.36350.0541Metric Values ➢Classes & Tolerances ➢6-UN1781 5/8 - 6 6-UN1.62560.16671.51670.09020.04171.47332°1.42650.0541Metric Values ➢Classes & Tolerances ➢6-UN1841 11/16 - 6 6-UN1.68760.16671.57870.09020.04171.53531.92°1.48850.0541Metric Values ➢Classes & Tolerances ➢6-UN1901 3/4 - 6 6-UN1.7560.16671.64170.09020.04171.59831.85°1.55150.0541Metric Values ➢Classes & Tolerances ➢6-UN1961 13/16 - 6 6-UN1.81260.16671.70370.09020.04171.66031.78°1.61350.0541Metric Values ➢Classes & Tolerances ➢6-UN2011 7/8 - 6 6-UN1.87560.16671.76670.09020.04171.72331.72°1.67650.0541Metric Values ➢Classes & Tolerances ➢6-UN2061 15/16 - 6 6-UN1.93760.16671.82870.09020.04171.78531.66°1.73850.0541Metric Values ➢Classes & Tolerances ➢6-UN2112 - 6 6-UN260.16671.89170.09020.04171.84831.61°1.80150.0541Metric Values ➢Classes & Tolerances ➢6-UN2172 1/8 - 6 6-UN2.12560.16672.01670.09020.04171.97331.51°1.92650.0541Metric Values ➢Classes & Tolerances ➢6-UN2222 1/4 - 6 6-UN2.2560.16672.14170.09020.04172.09831.42°2.05150.0541Metric Values ➢Classes & Tolerances ➢6-UN2282 3/8 - 6 6-UN2.37560.16672.26670.09020.04172.22331.34°2.17650.0541Metric Values ➢Classes & Tolerances ➢6-UN2332 1/2 - 6 6-UN2.560.16672.39170.09020.04172.34831.27°2.30150.0541Metric Values ➢Classes & Tolerances ➢6-UN2402 5/8 - 6 6-UN2.62560.16672.51670.09020.04172.47331.21°2.42650.0541Metric Values ➢Classes & Tolerances ➢6-UN2462 3/4 - 6 6-UN2.7560.16672.64170.09020.04172.59831.15°2.55150.0541Metric Values ➢Classes & Tolerances ➢6-UN2532 7/8 - 6 6-UN2.87560.16672.76670.09020.04172.72331.1°2.67650.0541Metric Values ➢Classes & Tolerances ➢6-UN2593 - 6 6-UN360.16672.89170.09020.04172.84831.05°2.80150.0541Metric Values ➢Classes & Tolerances ➢6-UN2663 1/8 - 6 6-UN3.12560.16673.01670.09020.04172.97331.01°2.92650.0541Metric Values ➢Classes & Tolerances ➢6-UN2723 1/4 - 6 6-UN3.2560.16673.14170.09020.04173.09830.97°3.05150.0541Metric Values ➢Classes & Tolerances ➢6-UN2783 3/8 - 6 6-UN3.37560.16673.26670.09020.04173.22330.93°3.17650.0541Metric Values ➢Classes & Tolerances ➢6-UN2833 1/2 - 6 6-UN3.560.16673.39170.09020.04173.34830.9°3.30150.0541Metric Values ➢Classes & Tolerances ➢6-UN2893 5/8 - 6 6-UN3.62560.16673.51670.09020.04173.47330.86°3.42650.0541Metric Values ➢Classes & Tolerances ➢6-UN2943 3/4 - 6 6-UN3.7560.16673.64170.09020.04173.59830.83°3.55150.0541Metric Values ➢Classes & Tolerances ➢6-UN3003 7/8 - 6 6-UN3.87560.16673.76670.09020.04173.72330.81°3.67650.0541Metric Values ➢Classes & Tolerances ➢6-UN3054 - 6 6-UN460.16673.89170.09020.04173.84830.78°3.80150.0541Metric Values ➢Classes & Tolerances ➢6-UN3114 1/8 - 6 6-UN4.12560.16674.01670.09020.04173.97330.76°3.92650.0541Metric Values ➢Classes & Tolerances ➢6-UN3164 1/4 - 6 6-UN4.2560.16674.14170.09020.04174.09830.73°4.05150.0541Metric Values ➢Classes & Tolerances ➢6-UN3214 3/8 - 6 6-UN4.37560.16674.26670.09020.04174.22330.71°4.17650.0541Metric Values ➢Classes & Tolerances ➢6-UN3264 1/2 - 6 6-UN4.560.16674.39170.09020.04174.34830.69°4.30150.0541Metric Values ➢Classes & Tolerances ➢6-UN3314 5/8 - 6 6-UN4.62560.16674.51670.09020.04174.47330.67°4.42650.0541Metric Values ➢Classes & Tolerances ➢6-UN3364 3/4 - 6 6-UN4.7560.16674.64170.09020.04174.59830.65°4.55150.0541Metric Values ➢Classes & Tolerances ➢6-UN3424 7/8 - 6 6-UN4.87560.16674.76670.09020.04174.72330.64°4.67650.0541Metric Values ➢Classes & Tolerances ➢6-UN3475 - 6 6-UN560.16674.89170.09020.04174.84830.62°4.80150.0541Metric Values ➢Classes & Tolerances ➢6-UN3525 1/8 - 6 6-UN5.12560.16675.01670.09020.04174.97330.61°4.92650.0541Metric Values ➢Classes & Tolerances ➢6-UN3575 1/4 - 6 6-UN5.2560.16675.14170.09020.04175.09830.59°5.05150.0541Metric Values ➢Classes & Tolerances ➢6-UN3625 3/8 - 6 6-UN5.37560.16675.26670.09020.04175.22330.58°5.17650.0541Metric Values ➢Classes & Tolerances ➢6-UN3675 1/2 - 6 6-UN5.560.16675.39170.09020.04175.34830.56°5.30150.0541Metric Values ➢Classes & Tolerances ➢6-UN3725 5/8 - 6 6-UN5.62560.16675.51670.09020.04175.47330.55°5.42650.0541Metric Values ➢Classes & Tolerances ➢6-UN3775 3/4 - 6 6-UN5.7560.16675.64170.09020.04175.59830.54°5.55150.0541Metric Values ➢Classes & Tolerances ➢6-UN3825 7/8 - 6 6-UN5.87560.16675.76670.09020.04175.72330.53°5.67650.0541Metric Values ➢Classes & Tolerances ➢6-UN3876 - 6 6-UN660.16675.89170.09020.04175.84830.52°5.80150.0541Metric Values ➢Classes & Tolerances ➢6-UN3921 - 8 8-UN180.12500.91880.06770.03130.88632.48°0.85120.0406Metric Values ➢Classes & Tolerances ➢8-UN1121 1/16 - 8 8-UN1.06280.12500.98080.06770.03130.94832.32°0.91320.0406Metric Values ➢Classes & Tolerances ➢8-UN1191 1/8 - 8 8-UN1.12580.12501.04380.06770.03131.01132.18°0.97620.0406Metric Values ➢Classes & Tolerances ➢8-UN1271 3/16 - 8 8-UN1.18780.12501.10580.06770.03131.07332.06°1.03820.0406Metric Values ➢Classes & Tolerances ➢8-UN1331 1/4 - 8 8-UN1.2580.12501.16880.06770.03131.13631.95°1.10120.0406Metric Values ➢Classes & Tolerances ➢8-UN1411 5/16 - 8 8-UN1.31280.12501.23080.06770.03131.19831.85°1.16320.0406Metric Values ➢Classes & Tolerances ➢8-UN1471 3/8 - 8 8-UN1.37580.12501.29380.06770.03131.26131.76°1.22620.0406Metric Values ➢Classes & Tolerances ➢8-UN1561 7/16 - 8 8-UN1.43780.12501.35580.06770.03131.32331.68°1.28820.0406Metric Values ➢Classes & Tolerances ➢8-UN1631 1/2 - 8 8-UN1.580.12501.41880.06770.03131.38631.61°1.35120.0406Metric Values ➢Classes & Tolerances ➢8-UN1721 9/16 - 8 8-UN1.56280.12501.48080.06770.03131.44831.54°1.41320.0406Metric Values ➢Classes & Tolerances ➢8-UN1791 5/8 - 8 8-UN1.62580.12501.54380.06770.03131.51131.48°1.47620.0406Metric Values ➢Classes & Tolerances ➢8-UN1851 11/16 - 8 8-UN1.68780.12501.60580.06770.03131.57331.42°1.53820.0406Metric Values ➢Classes & Tolerances ➢8-UN1911 3/4 - 8 8-UN1.7580.12501.66880.06770.03131.63631.37°1.60120.0406Metric Values ➢Classes & Tolerances ➢8-UN1971 13/16 - 8 8-UN1.81280.12501.73080.06770.03131.69831.32°1.66320.0406Metric Values ➢Classes & Tolerances ➢8-UN2021 7/8 - 8 8-UN1.87580.12501.79380.06770.03131.76131.27°1.72620.0406Metric Values ➢Classes & Tolerances ➢8-UN2071 15/16 - 8 8-UN1.93780.12501.85580.06770.03131.82331.23°1.78820.0406Metric Values ➢Classes & Tolerances ➢8-UN2122 - 8 8-UN280.12501.91880.06770.03131.88631.19°1.85120.0406Metric Values ➢Classes & Tolerances ➢8-UN2182 1/8 - 8 8-UN2.12580.12502.04380.06770.03132.01131.12°1.97620.0406Metric Values ➢Classes & Tolerances ➢8-UN2232 1/4 - 8 8-UN2.2580.12502.16880.06770.03132.13631.05°2.10120.0406Metric Values ➢Classes & Tolerances ➢8-UN2292 3/8 - 8 8-UN2.37580.12502.29380.06770.03132.26130.99°2.22620.0406Metric Values ➢Classes & Tolerances ➢8-UN2342 1/2 - 8 8-UN2.580.12502.41880.06770.03132.38630.94°2.35120.0406Metric Values ➢Classes & Tolerances ➢8-UN2412 5/8 - 8 8-UN2.62580.12502.54380.06770.03132.51130.9°2.47620.0406Metric Values ➢Classes & Tolerances ➢8-UN2472 3/4 - 8 8-UN2.7580.12502.66880.06770.03132.63630.85°2.60120.0406Metric Values ➢Classes & Tolerances ➢8-UN2542 7/8 - 8 8-UN2.87580.12502.79380.06770.03132.76130.82°2.72620.0406Metric Values ➢Classes & Tolerances ➢8-UN2603 - 8 8-UN380.12502.91880.06770.03132.88630.78°2.85120.0406Metric Values ➢Classes & Tolerances ➢8-UN2673 1/8 - 8 8-UN3.12580.12503.04380.06770.03133.01130.75°2.97620.0406Metric Values ➢Classes & Tolerances ➢8-UN2733 1/4 - 8 8-UN3.2580.12503.16880.06770.03133.13630.72°3.10120.0406Metric Values ➢Classes & Tolerances ➢8-UN2793 3/8 - 8 8-UN3.37580.12503.29380.06770.03133.26130.69°3.22620.0406Metric Values ➢Classes & Tolerances ➢8-UN2843 1/2 - 8 8-UN3.580.12503.41880.06770.03133.38630.67°3.35120.0406Metric Values ➢Classes & Tolerances ➢8-UN2903 5/8 - 8 8-UN3.62580.12503.54380.06770.03133.51130.64°3.47620.0406Metric Values ➢Classes & Tolerances ➢8-UN2953 3/4 - 8 8-UN3.7580.12503.66880.06770.03133.63630.62°3.60120.0406Metric Values ➢Classes & Tolerances ➢8-UN3013 7/8 - 8 8-UN3.87580.12503.79380.06770.03133.76130.6°3.72620.0406Metric Values ➢Classes & Tolerances ➢8-UN3064 - 8 8-UN480.12503.91880.06770.03133.88630.58°3.85120.0406Metric Values ➢Classes & Tolerances ➢8-UN3124 1/8 - 8 8-UN4.12580.12504.04380.06770.03134.01130.56°3.97620.0406Metric Values ➢Classes & Tolerances ➢8-UN3174 1/4 - 8 8-UN4.2580.12504.16880.06770.03134.13630.55°4.10120.0406Metric Values ➢Classes & Tolerances ➢8-UN3224 3/8 - 8 8-UN4.37580.12504.29380.06770.03134.26130.53°4.22620.0406Metric Values ➢Classes & Tolerances ➢8-UN3274 1/2 - 8 8-UN4.580.12504.41880.06770.03134.38630.52°4.35120.0406Metric Values ➢Classes & Tolerances ➢8-UN3324 5/8 - 8 8-UN4.62580.12504.54380.06770.03134.51130.5°4.47620.0406Metric Values ➢Classes & Tolerances ➢8-UN3374 3/4 - 8 8-UN4.7580.12504.66880.06770.03134.63630.49°4.60120.0406Metric Values ➢Classes & Tolerances ➢8-UN3434 7/8 - 8 8-UN4.87580.12504.79380.06770.03134.76130.48°4.72620.0406Metric Values ➢Classes & Tolerances ➢8-UN3485 - 8 8-UN580.12504.91880.06770.03134.88630.46°4.85120.0406Metric Values ➢Classes & Tolerances ➢8-UN3535 1/8 - 8 8-UN5.12580.12505.04380.06770.03135.01130.45°4.97620.0406Metric Values ➢Classes & Tolerances ➢8-UN3585 1/4 - 8 8-UN5.2580.12505.16880.06770.03135.13630.44°5.10120.0406Metric Values ➢Classes & Tolerances ➢8-UN3635 3/8 - 8 8-UN5.37580.12505.29380.06770.03135.26130.43°5.22620.0406Metric Values ➢Classes & Tolerances ➢8-UN3685 1/2 - 8 8-UN5.580.12505.41880.06770.03135.38630.42°5.35120.0406Metric Values ➢Classes & Tolerances ➢8-UN3735 5/8 - 8 8-UN5.62580.12505.54380.06770.03135.51130.41°5.47620.0406Metric Values ➢Classes & Tolerances ➢8-UN3785 3/4 - 8 8-UN5.7580.12505.66880.06770.03135.63630.4°5.60120.0406Metric Values ➢Classes & Tolerances ➢8-UN3835 7/8 - 8 8-UN5.87580.12505.79380.06770.03135.76130.39°5.72620.0406Metric Values ➢Classes & Tolerances ➢8-UN3886 - 8 8-UN680.12505.91880.06770.03135.88630.39°5.85120.0406Metric Values ➢Classes & Tolerances ➢8-UN393limits of Thread Dimensions (UNC, UNF & UNEF)To manufacture or measure a thread, one has to know the maximum and minimum permissible values of the basic dimensions. These values are calculated according to the thread class (See below). To understand classes, you first need to understand the terms Allowance (Sometimes referred to as deviation) and Tolerances.Definition of terms:Allowance (Deviation): The minimum permissible distance between the basic and actual profile.Tolerance: The width of the tolerance field of a diameter on the actual thread profile. (Pitch, Major & Minor diameters)A small allowance means that the assembly of a male and female thread will be harder, but after assembly, there will be less freedom of movement.A large allowance means that the assembly of a male and female thread will be easier, but after assembly, there will be more freedom of movement.The allowance size does not influence a thread’s production difficulty or price.A wide tolerance is easier and cheaper to produce but yields a larger spread between threads.A narrow tolerance is challenging to produce and more expensive but yields a smaller spread between threads.Unified Thread ClassesThe class is defined by a two-character code.The first character defines is a digit between 1 and 3. 1=Loose fit, 2=Medium fit, and 3=Tight fit.The second character is a letter. A=External thread and B=Internal thread.In the Unified Inch thread system, only classes 1A & 2A have an allowance. The allowance for the two classes is the same.The other 4 classes have an allowance of Zero.All the internal thread profiles (B classes) have no allowance.Classes 1A & 1B: These classes are suitable for applications where a liberal tolerance and allowance are required to permit easy assembly. The maximum diameters of Class 1A threads are smaller than the basic diameter by the allowance amount. The minimum diameters of Class 1B threads are equal to the basic diameters and consequently afford no allowance at maximum material condition.Classes 2A & 2B: Classes 2A (external) and 2B (internal) are the default classes used for the commercial production of Nut, Bols, and otehr threaded fasteners. They are the default class unless otherwise specified. they have the same allowance as classes 1A/1B. However, they have a narrower tolerance field. The difficulty of assembly is the same, but the spread between different parts in a production batch is smaller.Classes 3A & 3B: These classes are suitable for applications where tight fit and accuracy of thread elements are essential. The maximum diameters of Class 3A threads and the minimum diameters of Class 3B threads are the same (Both have zero allowance). The accuracy is high, but the assembly is difficult.Combinations of Classes: The engineer can select any valid class for the male and female threads to achieve his design goals. The valid classes are defined in ASTM B1.1 as follows:Classes 2A, 2A, 3B, and 3B are always valid.Classes 1A & 1B are valid only for UNC threads with a nominal diameter equal to or larger than 1/4″.Unified Thread Allowance.The allowance es should be calculated for external threads with classes 1A and 2A. The allowance of both classes is the same and equals 0.3 times the pitch diameter tolerance of class 2A. It is the function of 3 parameters.D – Basic (nominal diameter)P – Pitch (1/TPI)LE – Length of engagement. If not explicitly specified, the length of engagement is assumed to be 5 pitches. (LE=5*P)All parameters are in inches$ \large es = 0.3 \times \left [ 0.0015 \times \sqrt[3]{D} + 0.0015 \times \sqrt{LE} + 0.015 \times \sqrt[3]{P^{2}} \right ] $\begin{array} \large \,es& = 0.3 \times\,[\,0.0015 \times \sqrt[3]{D} &\\ & +\,0.0015 \times \sqrt{LE}&\\ & + 0.015 \times \sqrt[3]{P^{2}}\,] \end{array}The result should be rounded to 6 decimal places.ASTM B1.1 lists in a long chart the allowance for each thread size. However, the results of this formula are 100% accurate, and there is no need to browse the chart.You can use our Advanced Threading Calculator to obtain the allowance according to a thread description or use the mini-calculator below.Unified Thread Allowance CalculatorPayment options Unified Thread TolerancesThe tolerances TD for internal threads and Td for external threads are derived from the class. The tolerances can be calculated according to the below formulas.Td – Tolerance for External Major DiameterTd2 – Tolerance for External Pitch DiameterTD1 – Tolerance for Internal Minor DiameterTD2 – Tolerance for Internal Pitch DiameterT – Base Tolerance (The tolerance of CLASS 2A pitch diameter is the base tolerance from which other tolerances are derived)D – Basic thread diameter.P – Pitch (1/TPI).LE – Length of engagement. (If unknown, the default is 5 * P)All input parameters and results are in Inches.Base Tolerance Formula$ \large T = 0.0015 \times \sqrt[3]{D} + 0.0015 \times \sqrt{LE} + 0.015 \times \sqrt[3]{P^{2}}$\begin{array} \large \,T& = \,0.0015 \times \sqrt[3]{D} &\\ & +\,0.0015 \times \sqrt{LE}&\\ & + 0.015 \times \sqrt[3]{P^{2}} \end{array}Formulas for External thread(Classes 1A,2A & 3A)$ \large T_{d(1A)} = 0.3 \times T $$ \large T_{d2(1A)} = 1.5 \times T $$ \large T_{d(2A)} = 0.06 \times \sqrt[3]{P^2} $$ \large T_{d2(2A)} = T $$ \large T_{d(3A)} = 0.06 \times \sqrt[3]{P^2} $$ \large T_{d2(3A)} = 0.75 \times T $Formulas for Internal Thread(Classes 1B,2B & 3B)$ \large T_{d1(1B)} = 0.25 \times P\,-\,0.4 \times P^{2} $$ \large T_{d2(1B)} = 1.95 \times T $$ \large T_{d1(2B)} = 0.25 \times P\,-\,0.4 \times P^{2} $$ \large T_{d2(2B)} = 1.30 \times T $$\begin{array}{ll} \large T_{d1(3B)}=&0.05 \times \sqrt[3]{P} + &\\ &0.003 \times \frac{P}{D}\,-\,0.002 \end{array} $$ \large T_{d2(3B)} = 0.975 \times T $The above formulas can be used in most cases. However, ASTM B1.1 lists various scenarios where other formulas or quirky rounding rules apply. Use our Advanced Threading Calculator to get exact results for any thread.Usage notes for the above formulas:The result should be rounded to 6 decimal places.Formulas for external threads are valid for all threads.Formulas for internal threads are valid only for thread diameters above 1/4″, a pitch between 4 and 80 TPI, and engagement lengths up to 1.5 X D.In some cases, ASTM B1.1 dictates special rounding rules.You can use the Threading Calculator, which automatically considers all the above rules.Unified Thread limits CalculationsOnce the Td, TD, & es values are known, the final limits can be calculated according to the formulas below.Formulas for Limits of a Unified Inch External Thread$ \large d_{max}=d-{es} $$ \large d_{min}=d_{max}-T_d $$ \large d_{2max} = d2 – es $$ \large d_{2min}=d_{2max}-T_{d2} $Formulas for Limits of a Unified Inch InternalThread$ \large D_{1min}=D $$ \large D_{1max}=D_{1min}+T_{D1} $$ \large D_{2minx} = D_2 $$ \large D_{2max}=D_{2min}+ T_{D2} $Related Glossary Terms:PitchThread Allowance (es)Major DiameterTooth per inch (tpi)Lead (Threading)Minor DiameterPitch DiameterFundamental TriangleThread Height (Depth)Thread addendumTap Drill SizeMaximum material condition (MMC)Length of Engagement

The allowance es should be calculated for external threads with classes 1A and 2A. The allowance of both classes is the same and equals 0.3 times the pitch diameter tolerance of class 2A. It is the function of 3 parameters.D – Basic (nominal diameter)P – Pitch (1/TPI)LE – Length of engagement. If not explicitly specified, the length of engagement is assumed to be 5 pitches. (LE=5*P)All parameters are in inches$ \large es = 0.3 \times \left [ 0.0015 \times \sqrt[3]{D} + 0.0015 \times \sqrt{LE} + 0.015 \times \sqrt[3]{P^{2}} \right ] $\begin{array} \large \,es& = 0.3 \times\,[\,0.0015 \times \sqrt[3]{D} &\\ & +\,0.0015 \times \sqrt{LE}&\\ & + 0.015 \times \sqrt[3]{P^{2}}\,] \end{array}The result should be rounded to 6 decimal places.ASTM B1.1 lists in a long chart the allowance for each thread size. However, the results of this formula are 100% accurate, and there is no need to browse the chart.You can use our Advanced Threading Calculator to obtain the allowance according to a thread description or use the mini-calculator below.Unified Thread Allowance CalculatorPayment options Unified Thread TolerancesThe tolerances TD for internal threads and Td for external threads are derived from the class. The tolerances can be calculated according to the below formulas.Td – Tolerance for External Major DiameterTd2 – Tolerance for External Pitch DiameterTD1 – Tolerance for Internal Minor DiameterTD2 – Tolerance for Internal Pitch DiameterT – Base Tolerance (The tolerance of CLASS 2A pitch diameter is the base tolerance from which other tolerances are derived)D – Basic thread diameter.P – Pitch (1/TPI).LE – Length of engagement. (If unknown, the default is 5 * P)All input parameters and results are in Inches.Base Tolerance Formula$ \large T = 0.0015 \times \sqrt[3]{D} + 0.0015 \times \sqrt{LE} + 0.015 \times \sqrt[3]{P^{2}}$\begin{array} \large \,T& = \,0.0015 \times \sqrt[3]{D} &\\ & +\,0.0015 \times \sqrt{LE}&\\ & + 0.015 \times \sqrt[3]{P^{2}} \end{array}Formulas for External thread(Classes 1A,2A & 3A)$ \large T_{d(1A)} = 0.3 \times T $$ \large T_{d2(1A)} = 1.5 \times T $$ \large T_{d(2A)} = 0.06 \times \sqrt[3]{P^2} $$ \large T_{d2(2A)} = T $$ \large T_{d(3A)} = 0.06 \times \sqrt[3]{P^2} $$ \large T_{d2(3A)} = 0.75 \times T $Formulas for Internal Thread(Classes 1B,2B & 3B)$ \large T_{d1(1B)} = 0.25 \times P\,-\,0.4 \times P^{2} $$ \large T_{d2(1B)} = 1.95 \times T $$ \large T_{d1(2B)} = 0.25 \times P\,-\,0.4 \times P^{2} $$ \large T_{d2(2B)} = 1.30 \times T $$\begin{array}{ll} \large T_{d1(3B)}=&0.05 \times \sqrt[3]{P} + &\\ &0.003 \times \frac{P}{D}\,-\,0.002 \end{array} $$ \large T_{d2(3B)} = 0.975 \times T $The above formulas can be used in most cases. However, ASTM B1.1 lists various scenarios where other formulas or quirky rounding rules apply. Use our Advanced Threading Calculator to get exact results for any thread.Usage notes for the above formulas:The result should be rounded to 6 decimal places.Formulas for external threads are valid for all threads.Formulas for internal threads are valid only for thread diameters above 1/4″, a pitch between 4 and 80 TPI, and engagement lengths up to 1.5 X D.In some cases, ASTM B1.1 dictates special rounding rules.You can use the Threading Calculator, which automatically considers all the above rules.Unified Thread limits CalculationsOnce the Td, TD, & es values are known, the final limits can be calculated according to the formulas below.Formulas for Limits of a Unified Inch External Thread$ \large d_{max}=d-{es} $$ \large d_{min}=d_{max}-T_d $$ \large d_{2max} = d2 – es $$ \large d_{2min}=d_{2max}-T_{d2} $Formulas for Limits of a Unified Inch InternalThread$ \large D_{1min}=D $$ \large D_{1max}=D_{1min}+T_{D1} $$ \large D_{2minx} = D_2 $$ \large D_{2max}=D_{2min}+ T_{D2} $Related Glossary Terms:PitchThread Allowance (es)Major DiameterTooth per inch (tpi)Lead (Threading)Minor DiameterPitch DiameterFundamental TriangleThread Height (Depth)Thread addendumTap Drill SizeMaximum material condition (MMC)Length of Engagement

May 29, 2021 — This type of cutterhead is sometimes also referred to as an helical cutterhead (or helical head for short), especially in North America. Helical ...

Click icon to show Full Thread DataThreadBasic DiamTPIPitchPitch DiamThread HeightCres/ RootTap Drill SizeLead AngleMinor DiameterThread addendumseriesid#0 - 80 UNF0.06800.01250.05190.00680.00310.04864.39°0.04510.0041Metric Values ➢Classes & Tolerances ➢UNF1#1 - 72 UNF0.073720.01390.0640.00750.00350.06043.95°0.05650.0045Metric Values ➢Classes & Tolerances ➢UNF3#2 - 64 UNF0.086640.01560.07590.00850.00390.07183.75°0.06740.0051Metric Values ➢Classes & Tolerances ➢UNF5#3 - 56 UNF0.099560.01790.08740.00970.00450.08283.72°0.07770.0058Metric Values ➢Classes & Tolerances ➢UNF7#4 - 48 UNF0.112480.02080.09850.01130.00520.0933.85°0.08720.0068Metric Values ➢Classes & Tolerances ➢UNF9#5 - 44 UNF0.125440.02270.11020.01230.00570.10433.75°0.09790.0074Metric Values ➢Classes & Tolerances ➢UNF11#6 - 40 UNF0.138400.02500.12180.01350.00630.11533.74°0.10820.0081Metric Values ➢Classes & Tolerances ➢UNF13#8 - 36 UNF0.164360.02780.1460.0150.00690.13873.47°0.13090.009Metric Values ➢Classes & Tolerances ➢UNF16#10 - 32 UNF0.19320.03130.16970.01690.00780.16163.35°0.15280.0101Metric Values ➢Classes & Tolerances ➢UNF19#12 - 28 UNF0.216280.03570.19280.01930.00890.18353.37°0.17350.0116Metric Values ➢Classes & Tolerances ➢UNF221/4 - 28 UNF0.25280.03570.22680.01930.00890.21752.87°0.20750.0116Metric Values ➢Classes & Tolerances ➢UNF275/16 - 24 UNF0.312240.04170.28490.02260.01040.27412.67°0.26240.0135Metric Values ➢Classes & Tolerances ➢UNF333/8 - 24 UNF0.375240.04170.34790.02260.01040.33712.18°0.32540.0135Metric Values ➢Classes & Tolerances ➢UNF397/16 - 20 UNF0.437200.05000.40450.02710.01250.39152.25°0.37750.0162Metric Values ➢Classes & Tolerances ➢UNF461/2 - 20 UNF0.5200.05000.46750.02710.01250.45451.95°0.44050.0162Metric Values ➢Classes & Tolerances ➢UNF539/16 - 18 UNF0.562180.05560.52590.03010.01390.51141.93°0.49580.018Metric Values ➢Classes & Tolerances ➢UNF605/8 - 18 UNF0.625180.05560.58890.03010.01390.57441.72°0.55880.018Metric Values ➢Classes & Tolerances ➢UNF683/4 - 16 UNF0.75160.06250.70940.03380.01560.69311.61°0.67560.0203Metric Values ➢Classes & Tolerances ➢UNF827/8 - 14 UNF0.875140.07140.82860.03870.01790.811.57°0.78990.0232Metric Values ➢Classes & Tolerances ➢UNF961 - 12 UNF1120.08330.94590.04510.02080.92421.61°0.90080.0271Metric Values ➢Classes & Tolerances ➢UNF1101 1/8 - 12 UNF1.125120.08331.07090.04510.02081.04921.42°1.02580.0271Metric Values ➢Classes & Tolerances ➢UNF1251 1/4 - 12 UNF1.25120.08331.19590.04510.02081.17421.27°1.15080.0271Metric Values ➢Classes & Tolerances ➢UNF1391 3/8 - 12 UNF1.375120.08331.32090.04510.02081.29921.15°1.27580.0271Metric Values ➢Classes & Tolerances ➢UNF1531 1/2 - 12 UNF1.5120.08331.44590.04510.02081.42421.05°1.40080.0271Metric Values ➢Classes & Tolerances ➢UNF169UNEF Series Basic Dimensions chartClick the Thread Link to get the Full Thread Data for all classesAll dimensions are in inches. To view the Metric translation, click the Thread LinkClick icon to show Additional columnsClick icon to show Full Thread DataThreadBasic DiamTPIPitchPitch DiamThread HeightCres/ RootTap Drill SizeLead AngleMinor DiameterThread addendumseriesid#12 - 32 UNEF0.216320.03130.19570.01690.00780.18762.91°0.17880.0101Metric Values ➢Classes & Tolerances ➢UNEF231/4 - 32 UNEF0.25320.03130.22970.01690.00780.22162.48°0.21280.0101Metric Values ➢Classes & Tolerances ➢UNEF285/16 - 32 UNEF0.312320.03130.29170.01690.00780.28361.95°0.27480.0101Metric Values ➢Classes & Tolerances ➢UNEF343/8 - 32 UNEF0.375320.03130.35470.01690.00780.34661.61°0.33780.0101Metric Values ➢Classes & Tolerances ➢UNEF407/16 - 28 UNEF0.437280.03570.41380.01930.00890.40451.57°0.39450.0116Metric Values ➢Classes & Tolerances ➢UNEF471/2 - 28 UNEF0.5280.03570.47680.01930.00890.46751.37°0.45750.0116Metric Values ➢Classes & Tolerances ➢UNEF549/16 - 24 UNEF0.562240.04170.53490.02260.01040.52411.42°0.51240.0135Metric Values ➢Classes & Tolerances ➢UNEF615/8 - 24 UNEF0.625240.04170.59790.02260.01040.58711.27°0.57540.0135Metric Values ➢Classes & Tolerances ➢UNEF6911/16 - 24 UNEF0.687240.04170.65990.02260.01040.64911.15°0.63740.0135Metric Values ➢Classes & Tolerances ➢UNEF753/4 - 20 UNEF0.75200.05000.71750.02710.01250.70451.27°0.69050.0162Metric Values ➢Classes & Tolerances ➢UNEF8313/16 - 20 UNEF0.812200.05000.77950.02710.01250.76651.17°0.75250.0162Metric Values ➢Classes & Tolerances ➢UNEF897/8 - 20 UNEF0.875200.05000.84250.02710.01250.82951.08°0.81550.0162Metric Values ➢Classes & Tolerances ➢UNEF9715/16 - 20 UNEF0.937200.05000.90450.02710.01250.89151.01°0.87750.0162Metric Values ➢Classes & Tolerances ➢UNEF1031 - 20 UNEF1200.05000.96750.02710.01250.95450.94°0.94050.0162Metric Values ➢Classes & Tolerances ➢UNEF1111 1/16 - 18 UNEF1.062180.05561.02590.03010.01391.01140.99°0.99580.018Metric Values ➢Classes & Tolerances ➢UNEF1181 1/8 - 18 UNEF1.125180.05561.08890.03010.01391.07440.93°1.05880.018Metric Values ➢Classes & Tolerances ➢UNEF1261 3/16 - 18 UNEF1.187180.05561.15090.03010.01391.13640.88°1.12080.018Metric Values ➢Classes & Tolerances ➢UNEF1321 1/4 - 18 UNEF1.25180.05561.21390.03010.01391.19940.83°1.18380.018Metric Values ➢Classes & Tolerances ➢UNEF1401 5/16 - 18 UNEF1.312180.05561.27590.03010.01391.26140.79°1.24580.018Metric Values ➢Classes & Tolerances ➢UNEF1461 3/8 - 18 UNEF1.375180.05561.33890.03010.01391.32440.76°1.30880.018Metric Values ➢Classes & Tolerances ➢UNEF1541 7/16 - 18 UNEF1.437180.05561.40090.03010.01391.38640.72°1.37080.018Metric Values ➢Classes & Tolerances ➢UNEF1611 1/2 - 18 UNEF1.5180.05561.46390.03010.01391.44940.69°1.43380.018Metric Values ➢Classes & Tolerances ➢UNEF1701 9/16 - 18 UNEF1.562180.05561.52590.03010.01391.51140.66°1.49580.018Metric Values ➢Classes & Tolerances ➢UNEF1771 5/8 - 18 UNEF1.625180.05561.58890.03010.01391.57440.64°1.55880.018Metric Values ➢Classes & Tolerances ➢UNEF1831 11/16 - 18 UNEF1.687180.05561.65090.03010.01391.63640.61°1.62080.018Metric Values ➢Classes & Tolerances ➢UNEF189UN Constant Pitch Series Basic Dimensions chartClick the Thread Link to get the Full Thread Data for all classesAll dimensions are in inches. To view the Metric translation, click the Thread LinkClick icon to show Additional columnsClick icon to show Full Thread DataThreadBasic DiamTPIPitchPitch DiamThread HeightCres/ RootTap Drill SizeLead AngleMinor DiameterThread addendumseriesid9/16 - 12 12-UN0.562120.08330.50790.04510.02080.48622.99°0.46280.0271Metric Values ➢Classes & Tolerances ➢12-UN625/8 - 12 12-UN0.625120.08330.57090.04510.02080.54922.66°0.52580.0271Metric Values ➢Classes & Tolerances ➢12-UN7011/16 - 12 12-UN0.687120.08330.63290.04510.02080.61122.4°0.58780.0271Metric Values ➢Classes & Tolerances ➢12-UN763/4 - 12 12-UN0.75120.08330.69590.04510.02080.67422.18°0.65080.0271Metric Values ➢Classes & Tolerances ➢12-UN8413/16 - 12 12-UN0.812120.08330.75790.04510.02080.73622°0.71280.0271Metric Values ➢Classes & Tolerances ➢12-UN907/8 - 12 12-UN0.875120.08330.82090.04510.02080.79921.85°0.77580.0271Metric Values ➢Classes & Tolerances ➢12-UN9815/16 - 12 12-UN0.937120.08330.88290.04510.02080.86121.72°0.83780.0271Metric Values ➢Classes & Tolerances ➢12-UN1041 - 12 12-UN1120.08330.94590.04510.02080.92421.61°0.90080.0271Metric Values ➢Classes & Tolerances ➢12-UN1131 1/16 - 12 12-UN1.062120.08331.00790.04510.02080.98621.51°0.96280.0271Metric Values ➢Classes & Tolerances ➢12-UN1201 1/8 - 12 12-UN1.125120.08331.07090.04510.02081.04921.42°1.02580.0271Metric Values ➢Classes & Tolerances ➢12-UN1281 3/16 - 12 12-UN1.187120.08331.13290.04510.02081.11121.34°1.08780.0271Metric Values ➢Classes & Tolerances ➢12-UN1341 1/4 - 12 12-UN1.25120.08331.19590.04510.02081.17421.27°1.15080.0271Metric Values ➢Classes & Tolerances ➢12-UN1421 5/16 - 12 12-UN1.312120.08331.25790.04510.02081.23621.21°1.21280.0271Metric Values ➢Classes & Tolerances ➢12-UN1481 3/8 - 12 12-UN1.375120.08331.32090.04510.02081.29921.15°1.27580.0271Metric Values ➢Classes & Tolerances ➢12-UN1571 7/16 - 12 12-UN1.437120.08331.38290.04510.02081.36121.1°1.33780.0271Metric Values ➢Classes & Tolerances ➢12-UN1641 1/2 - 12 12-UN1.5120.08331.44590.04510.02081.42421.05°1.40080.0271Metric Values ➢Classes & Tolerances ➢12-UN1731 9/16 - 12 12-UN1.562120.08331.50790.04510.02081.48621.01°1.46280.0271Metric Values ➢Classes & Tolerances ➢12-UN1801 5/8 - 12 12-UN1.625120.08331.57090.04510.02081.54920.97°1.52580.0271Metric Values ➢Classes & Tolerances ➢12-UN1861 11/16 - 12 12-UN1.687120.08331.63290.04510.02081.61120.93°1.58780.0271Metric Values ➢Classes & Tolerances ➢12-UN1921 3/4 - 12 12-UN1.75120.08331.69590.04510.02081.67420.9°1.65080.0271Metric Values ➢Classes & Tolerances ➢12-UN1981 13/16 - 12 12-UN1.812120.08331.75790.04510.02081.73620.86°1.71280.0271Metric Values ➢Classes & Tolerances ➢12-UN2031 7/8 - 12 12-UN1.875120.08331.82090.04510.02081.79920.83°1.77580.0271Metric Values ➢Classes & Tolerances ➢12-UN2081 15/16 - 12 12-UN1.937120.08331.88290.04510.02081.86120.81°1.83780.0271Metric Values ➢Classes & Tolerances ➢12-UN2132 - 12 12-UN2120.08331.94590.04510.02081.92420.78°1.90080.0271Metric Values ➢Classes & Tolerances ➢12-UN2192 1/8 - 12 12-UN2.125120.08332.07090.04510.02082.04920.73°2.02580.0271Metric Values ➢Classes & Tolerances ➢12-UN2242 1/4 - 12 12-UN2.25120.08332.19590.04510.02082.17420.69°2.15080.0271Metric Values ➢Classes & Tolerances ➢12-UN2302 3/8 - 12 12-UN2.375120.08332.32090.04510.02082.29920.65°2.27580.0271Metric Values ➢Classes & Tolerances ➢12-UN2352 1/2 - 12 12-UN2.5120.08332.44590.04510.02082.42420.62°2.40080.0271Metric Values ➢Classes & Tolerances ➢12-UN2422 5/8 - 12 12-UN2.625120.08332.57090.04510.02082.54920.59°2.52580.0271Metric Values ➢Classes & Tolerances ➢12-UN2482 3/4 - 12 12-UN2.75120.08332.69590.04510.02082.67420.56°2.65080.0271Metric Values ➢Classes & Tolerances ➢12-UN2552 7/8 - 12 12-UN2.875120.08332.82090.04510.02082.79920.54°2.77580.0271Metric Values ➢Classes & Tolerances ➢12-UN2613 - 12 12-UN3120.08332.94590.04510.02082.92420.52°2.90080.0271Metric Values ➢Classes & Tolerances ➢12-UN2683 1/8 - 12 12-UN3.125120.08333.07090.04510.02083.04920.49°3.02580.0271Metric Values ➢Classes & Tolerances ➢12-UN2743 1/4 - 12 12-UN3.25120.08333.19590.04510.02083.17420.48°3.15080.0271Metric Values ➢Classes & Tolerances ➢12-UN2803 3/8 - 12 12-UN3.375120.08333.32090.04510.02083.29920.46°3.27580.0271Metric Values ➢Classes & Tolerances ➢12-UN2853 1/2 - 12 12-UN3.5120.08333.44590.04510.02083.42420.44°3.40080.0271Metric Values ➢Classes & Tolerances ➢12-UN2913 5/8 - 12 12-UN3.625120.08333.57090.04510.02083.54920.43°3.52580.0271Metric Values ➢Classes & Tolerances ➢12-UN2963 3/4 - 12 12-UN3.75120.08333.69590.04510.02083.67420.41°3.65080.0271Metric Values ➢Classes & Tolerances ➢12-UN3023 7/8 - 12 12-UN3.875120.08333.82090.04510.02083.79920.4°3.77580.0271Metric Values ➢Classes & Tolerances ➢12-UN3074 - 12 12-UN4120.08333.94590.04510.02083.92420.39°3.90080.0271Metric Values ➢Classes & Tolerances ➢12-UN3134 1/8 - 12 12-UN4.125120.08334.07090.04510.02084.04920.37°4.02580.0271Metric Values ➢Classes & Tolerances ➢12-UN3184 1/4 - 12 12-UN4.25120.08334.19590.04510.02084.17420.36°4.15080.0271Metric Values ➢Classes & Tolerances ➢12-UN3234 3/8 - 12 12-UN4.375120.08334.32090.04510.02084.29920.35°4.27580.0271Metric Values ➢Classes & Tolerances ➢12-UN3284 1/2 - 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32 32-UN0.75320.03130.72970.01690.00780.72160.78°0.71280.0101Metric Values ➢Classes & Tolerances ➢32-UN8813/16 - 32 32-UN0.812320.03130.79170.01690.00780.78360.72°0.77480.0101Metric Values ➢Classes & Tolerances ➢32-UN947/8 - 32 32-UN0.875320.03130.85470.01690.00780.84660.67°0.83780.0101Metric Values ➢Classes & Tolerances ➢32-UN10215/16 - 32 32-UN0.937320.03130.91670.01690.00780.90860.62°0.89980.0101Metric Values ➢Classes & Tolerances ➢32-UN1081 - 32 32-UN1320.03130.97970.01690.00780.97160.58°0.96280.0101Metric Values ➢Classes & Tolerances ➢32-UN1172 1/2 - 4 4-UN2.540.25002.33760.13530.06252.27251.95°2.20230.0812Metric Values ➢Classes & Tolerances ➢4-UN2392 5/8 - 4 4-UN2.62540.25002.46260.13530.06252.39751.85°2.32730.0812Metric Values ➢Classes & Tolerances ➢4-UN2452 3/4 - 4 4-UN2.7540.25002.58760.13530.06252.52251.76°2.45230.0812Metric Values ➢Classes & Tolerances ➢4-UN2522 7/8 - 4 4-UN2.87540.25002.71260.13530.06252.64751.68°2.57730.0812Metric Values ➢Classes & Tolerances ➢4-UN2583 - 4 4-UN340.25002.83760.13530.06252.77251.61°2.70230.0812Metric Values ➢Classes & Tolerances ➢4-UN2653 1/8 - 4 4-UN3.12540.25002.96260.13530.06252.89751.54°2.82730.0812Metric Values ➢Classes & Tolerances ➢4-UN2713 1/4 - 4 4-UN3.2540.25003.08760.13530.06253.02251.48°2.95230.0812Metric Values ➢Classes & Tolerances ➢4-UN2773 3/8 - 4 4-UN3.37540.25003.21260.13530.06253.14751.42°3.07730.0812Metric Values ➢Classes & Tolerances ➢4-UN2823 1/2 - 4 4-UN3.540.25003.33760.13530.06253.27251.37°3.20230.0812Metric Values ➢Classes & Tolerances ➢4-UN2883 5/8 - 4 4-UN3.62540.25003.46260.13530.06253.39751.32°3.32730.0812Metric Values ➢Classes & Tolerances ➢4-UN2933 3/4 - 4 4-UN3.7540.25003.58760.13530.06253.52251.27°3.45230.0812Metric Values ➢Classes & Tolerances ➢4-UN2993 7/8 - 4 4-UN3.87540.25003.71260.13530.06253.64751.23°3.57730.0812Metric Values ➢Classes & Tolerances ➢4-UN3044 - 4 4-UN440.25003.83760.13530.06253.77251.19°3.70230.0812Metric Values ➢Classes & Tolerances ➢4-UN3104 1/8 - 4 4-UN4.12540.25003.96260.13530.06253.89751.15°3.82730.0812Metric Values ➢Classes & Tolerances ➢4-UN3154 1/4 - 4 4-UN4.2540.25004.08760.13530.06254.02251.12°3.95230.0812Metric Values ➢Classes & Tolerances ➢4-UN3204 3/8 - 4 4-UN4.37540.25004.21260.13530.06254.14751.08°4.07730.0812Metric Values ➢Classes & Tolerances ➢4-UN3254 1/2 - 4 4-UN4.540.25004.33760.13530.06254.27251.05°4.20230.0812Metric Values ➢Classes & Tolerances ➢4-UN3304 5/8 - 4 4-UN4.62540.25004.46260.13530.06254.39751.02°4.32730.0812Metric Values ➢Classes & Tolerances ➢4-UN3354 3/4 - 4 4-UN4.7540.25004.58760.13530.06254.52250.99°4.45230.0812Metric Values ➢Classes & Tolerances ➢4-UN3414 7/8 - 4 4-UN4.87540.25004.71260.13530.06254.64750.97°4.57730.0812Metric Values ➢Classes & Tolerances ➢4-UN3465 - 4 4-UN540.25004.83760.13530.06254.77250.94°4.70230.0812Metric Values ➢Classes & Tolerances ➢4-UN3515 1/8 - 4 4-UN5.12540.25004.96260.13530.06254.89750.92°4.82730.0812Metric Values ➢Classes & Tolerances ➢4-UN3565 1/4 - 4 4-UN5.2540.25005.08760.13530.06255.02250.9°4.95230.0812Metric Values ➢Classes & Tolerances ➢4-UN3615 3/8 - 4 4-UN5.37540.25005.21260.13530.06255.14750.87°5.07730.0812Metric Values ➢Classes & Tolerances ➢4-UN3665 1/2 - 4 4-UN5.540.25005.33760.13530.06255.27250.85°5.20230.0812Metric Values ➢Classes & Tolerances ➢4-UN3715 5/8 - 4 4-UN5.62540.25005.46260.13530.06255.39750.83°5.32730.0812Metric Values ➢Classes & Tolerances ➢4-UN3765 3/4 - 4 4-UN5.7540.25005.58760.13530.06255.52250.82°5.45230.0812Metric Values ➢Classes & Tolerances ➢4-UN3815 7/8 - 4 4-UN5.87540.25005.71260.13530.06255.64750.8°5.57730.0812Metric Values ➢Classes & Tolerances ➢4-UN3866 - 4 4-UN640.25005.83760.13530.06255.77250.78°5.70230.0812Metric Values ➢Classes & Tolerances ➢4-UN3911 3/8 - 6 6-UN1.37560.16671.26670.09020.04171.22332.4°1.17650.0541Metric Values ➢Classes & Tolerances ➢6-UN1551 7/16 - 6 6-UN1.43760.16671.32870.09020.04171.28532.29°1.23850.0541Metric Values ➢Classes & Tolerances ➢6-UN1621 1/2 - 6 6-UN1.560.16671.39170.09020.04171.34832.18°1.30150.0541Metric Values ➢Classes & Tolerances ➢6-UN1711 9/16 - 6 6-UN1.56260.16671.45370.09020.04171.41032.09°1.36350.0541Metric Values ➢Classes & Tolerances ➢6-UN1781 5/8 - 6 6-UN1.62560.16671.51670.09020.04171.47332°1.42650.0541Metric Values ➢Classes & Tolerances ➢6-UN1841 11/16 - 6 6-UN1.68760.16671.57870.09020.04171.53531.92°1.48850.0541Metric Values ➢Classes & Tolerances ➢6-UN1901 3/4 - 6 6-UN1.7560.16671.64170.09020.04171.59831.85°1.55150.0541Metric Values ➢Classes & Tolerances ➢6-UN1961 13/16 - 6 6-UN1.81260.16671.70370.09020.04171.66031.78°1.61350.0541Metric Values ➢Classes & Tolerances ➢6-UN2011 7/8 - 6 6-UN1.87560.16671.76670.09020.04171.72331.72°1.67650.0541Metric Values ➢Classes & Tolerances ➢6-UN2061 15/16 - 6 6-UN1.93760.16671.82870.09020.04171.78531.66°1.73850.0541Metric Values ➢Classes & Tolerances ➢6-UN2112 - 6 6-UN260.16671.89170.09020.04171.84831.61°1.80150.0541Metric Values ➢Classes & Tolerances ➢6-UN2172 1/8 - 6 6-UN2.12560.16672.01670.09020.04171.97331.51°1.92650.0541Metric Values ➢Classes & Tolerances ➢6-UN2222 1/4 - 6 6-UN2.2560.16672.14170.09020.04172.09831.42°2.05150.0541Metric Values ➢Classes & Tolerances ➢6-UN2282 3/8 - 6 6-UN2.37560.16672.26670.09020.04172.22331.34°2.17650.0541Metric Values ➢Classes & Tolerances ➢6-UN2332 1/2 - 6 6-UN2.560.16672.39170.09020.04172.34831.27°2.30150.0541Metric Values ➢Classes & Tolerances ➢6-UN2402 5/8 - 6 6-UN2.62560.16672.51670.09020.04172.47331.21°2.42650.0541Metric Values ➢Classes & Tolerances ➢6-UN2462 3/4 - 6 6-UN2.7560.16672.64170.09020.04172.59831.15°2.55150.0541Metric Values ➢Classes & Tolerances ➢6-UN2532 7/8 - 6 6-UN2.87560.16672.76670.09020.04172.72331.1°2.67650.0541Metric Values ➢Classes & Tolerances ➢6-UN2593 - 6 6-UN360.16672.89170.09020.04172.84831.05°2.80150.0541Metric Values ➢Classes & Tolerances ➢6-UN2663 1/8 - 6 6-UN3.12560.16673.01670.09020.04172.97331.01°2.92650.0541Metric Values ➢Classes & Tolerances ➢6-UN2723 1/4 - 6 6-UN3.2560.16673.14170.09020.04173.09830.97°3.05150.0541Metric Values ➢Classes & Tolerances ➢6-UN2783 3/8 - 6 6-UN3.37560.16673.26670.09020.04173.22330.93°3.17650.0541Metric Values ➢Classes & Tolerances ➢6-UN2833 1/2 - 6 6-UN3.560.16673.39170.09020.04173.34830.9°3.30150.0541Metric Values ➢Classes & Tolerances ➢6-UN2893 5/8 - 6 6-UN3.62560.16673.51670.09020.04173.47330.86°3.42650.0541Metric Values ➢Classes & Tolerances ➢6-UN2943 3/4 - 6 6-UN3.7560.16673.64170.09020.04173.59830.83°3.55150.0541Metric Values ➢Classes & Tolerances ➢6-UN3003 7/8 - 6 6-UN3.87560.16673.76670.09020.04173.72330.81°3.67650.0541Metric Values ➢Classes & Tolerances ➢6-UN3054 - 6 6-UN460.16673.89170.09020.04173.84830.78°3.80150.0541Metric Values ➢Classes & Tolerances ➢6-UN3114 1/8 - 6 6-UN4.12560.16674.01670.09020.04173.97330.76°3.92650.0541Metric Values ➢Classes & Tolerances ➢6-UN3164 1/4 - 6 6-UN4.2560.16674.14170.09020.04174.09830.73°4.05150.0541Metric Values ➢Classes & Tolerances ➢6-UN3214 3/8 - 6 6-UN4.37560.16674.26670.09020.04174.22330.71°4.17650.0541Metric Values ➢Classes & Tolerances ➢6-UN3264 1/2 - 6 6-UN4.560.16674.39170.09020.04174.34830.69°4.30150.0541Metric Values ➢Classes & Tolerances ➢6-UN3314 5/8 - 6 6-UN4.62560.16674.51670.09020.04174.47330.67°4.42650.0541Metric Values ➢Classes & Tolerances ➢6-UN3364 3/4 - 6 6-UN4.7560.16674.64170.09020.04174.59830.65°4.55150.0541Metric Values ➢Classes & Tolerances ➢6-UN3424 7/8 - 6 6-UN4.87560.16674.76670.09020.04174.72330.64°4.67650.0541Metric Values ➢Classes & Tolerances ➢6-UN3475 - 6 6-UN560.16674.89170.09020.04174.84830.62°4.80150.0541Metric Values ➢Classes & Tolerances ➢6-UN3525 1/8 - 6 6-UN5.12560.16675.01670.09020.04174.97330.61°4.92650.0541Metric Values ➢Classes & Tolerances ➢6-UN3575 1/4 - 6 6-UN5.2560.16675.14170.09020.04175.09830.59°5.05150.0541Metric Values ➢Classes & Tolerances ➢6-UN3625 3/8 - 6 6-UN5.37560.16675.26670.09020.04175.22330.58°5.17650.0541Metric Values ➢Classes & Tolerances ➢6-UN3675 1/2 - 6 6-UN5.560.16675.39170.09020.04175.34830.56°5.30150.0541Metric Values ➢Classes & Tolerances ➢6-UN3725 5/8 - 6 6-UN5.62560.16675.51670.09020.04175.47330.55°5.42650.0541Metric Values ➢Classes & Tolerances ➢6-UN3775 3/4 - 6 6-UN5.7560.16675.64170.09020.04175.59830.54°5.55150.0541Metric Values ➢Classes & Tolerances ➢6-UN3825 7/8 - 6 6-UN5.87560.16675.76670.09020.04175.72330.53°5.67650.0541Metric Values ➢Classes & Tolerances ➢6-UN3876 - 6 6-UN660.16675.89170.09020.04175.84830.52°5.80150.0541Metric Values ➢Classes & Tolerances ➢6-UN3921 - 8 8-UN180.12500.91880.06770.03130.88632.48°0.85120.0406Metric Values ➢Classes & Tolerances ➢8-UN1121 1/16 - 8 8-UN1.06280.12500.98080.06770.03130.94832.32°0.91320.0406Metric Values ➢Classes & Tolerances ➢8-UN1191 1/8 - 8 8-UN1.12580.12501.04380.06770.03131.01132.18°0.97620.0406Metric Values ➢Classes & Tolerances ➢8-UN1271 3/16 - 8 8-UN1.18780.12501.10580.06770.03131.07332.06°1.03820.0406Metric Values ➢Classes & Tolerances ➢8-UN1331 1/4 - 8 8-UN1.2580.12501.16880.06770.03131.13631.95°1.10120.0406Metric Values ➢Classes & Tolerances ➢8-UN1411 5/16 - 8 8-UN1.31280.12501.23080.06770.03131.19831.85°1.16320.0406Metric Values ➢Classes & Tolerances ➢8-UN1471 3/8 - 8 8-UN1.37580.12501.29380.06770.03131.26131.76°1.22620.0406Metric Values ➢Classes & Tolerances ➢8-UN1561 7/16 - 8 8-UN1.43780.12501.35580.06770.03131.32331.68°1.28820.0406Metric Values ➢Classes & Tolerances ➢8-UN1631 1/2 - 8 8-UN1.580.12501.41880.06770.03131.38631.61°1.35120.0406Metric Values ➢Classes & Tolerances ➢8-UN1721 9/16 - 8 8-UN1.56280.12501.48080.06770.03131.44831.54°1.41320.0406Metric Values ➢Classes & Tolerances ➢8-UN1791 5/8 - 8 8-UN1.62580.12501.54380.06770.03131.51131.48°1.47620.0406Metric Values ➢Classes & Tolerances ➢8-UN1851 11/16 - 8 8-UN1.68780.12501.60580.06770.03131.57331.42°1.53820.0406Metric Values ➢Classes & Tolerances ➢8-UN1911 3/4 - 8 8-UN1.7580.12501.66880.06770.03131.63631.37°1.60120.0406Metric Values ➢Classes & Tolerances ➢8-UN1971 13/16 - 8 8-UN1.81280.12501.73080.06770.03131.69831.32°1.66320.0406Metric Values ➢Classes & Tolerances ➢8-UN2021 7/8 - 8 8-UN1.87580.12501.79380.06770.03131.76131.27°1.72620.0406Metric Values ➢Classes & Tolerances ➢8-UN2071 15/16 - 8 8-UN1.93780.12501.85580.06770.03131.82331.23°1.78820.0406Metric Values ➢Classes & Tolerances ➢8-UN2122 - 8 8-UN280.12501.91880.06770.03131.88631.19°1.85120.0406Metric Values ➢Classes & Tolerances ➢8-UN2182 1/8 - 8 8-UN2.12580.12502.04380.06770.03132.01131.12°1.97620.0406Metric Values ➢Classes & Tolerances ➢8-UN2232 1/4 - 8 8-UN2.2580.12502.16880.06770.03132.13631.05°2.10120.0406Metric Values ➢Classes & Tolerances ➢8-UN2292 3/8 - 8 8-UN2.37580.12502.29380.06770.03132.26130.99°2.22620.0406Metric Values ➢Classes & Tolerances ➢8-UN2342 1/2 - 8 8-UN2.580.12502.41880.06770.03132.38630.94°2.35120.0406Metric Values ➢Classes & Tolerances ➢8-UN2412 5/8 - 8 8-UN2.62580.12502.54380.06770.03132.51130.9°2.47620.0406Metric Values ➢Classes & Tolerances ➢8-UN2472 3/4 - 8 8-UN2.7580.12502.66880.06770.03132.63630.85°2.60120.0406Metric Values ➢Classes & Tolerances ➢8-UN2542 7/8 - 8 8-UN2.87580.12502.79380.06770.03132.76130.82°2.72620.0406Metric Values ➢Classes & Tolerances ➢8-UN2603 - 8 8-UN380.12502.91880.06770.03132.88630.78°2.85120.0406Metric Values ➢Classes & Tolerances ➢8-UN2673 1/8 - 8 8-UN3.12580.12503.04380.06770.03133.01130.75°2.97620.0406Metric Values ➢Classes & Tolerances ➢8-UN2733 1/4 - 8 8-UN3.2580.12503.16880.06770.03133.13630.72°3.10120.0406Metric Values ➢Classes & Tolerances ➢8-UN2793 3/8 - 8 8-UN3.37580.12503.29380.06770.03133.26130.69°3.22620.0406Metric Values ➢Classes & Tolerances ➢8-UN2843 1/2 - 8 8-UN3.580.12503.41880.06770.03133.38630.67°3.35120.0406Metric Values ➢Classes & Tolerances ➢8-UN2903 5/8 - 8 8-UN3.62580.12503.54380.06770.03133.51130.64°3.47620.0406Metric Values ➢Classes & Tolerances ➢8-UN2953 3/4 - 8 8-UN3.7580.12503.66880.06770.03133.63630.62°3.60120.0406Metric Values ➢Classes & Tolerances ➢8-UN3013 7/8 - 8 8-UN3.87580.12503.79380.06770.03133.76130.6°3.72620.0406Metric Values ➢Classes & Tolerances ➢8-UN3064 - 8 8-UN480.12503.91880.06770.03133.88630.58°3.85120.0406Metric Values ➢Classes & Tolerances ➢8-UN3124 1/8 - 8 8-UN4.12580.12504.04380.06770.03134.01130.56°3.97620.0406Metric Values ➢Classes & Tolerances ➢8-UN3174 1/4 - 8 8-UN4.2580.12504.16880.06770.03134.13630.55°4.10120.0406Metric Values ➢Classes & Tolerances ➢8-UN3224 3/8 - 8 8-UN4.37580.12504.29380.06770.03134.26130.53°4.22620.0406Metric Values ➢Classes & Tolerances ➢8-UN3274 1/2 - 8 8-UN4.580.12504.41880.06770.03134.38630.52°4.35120.0406Metric Values ➢Classes & Tolerances ➢8-UN3324 5/8 - 8 8-UN4.62580.12504.54380.06770.03134.51130.5°4.47620.0406Metric Values ➢Classes & Tolerances ➢8-UN3374 3/4 - 8 8-UN4.7580.12504.66880.06770.03134.63630.49°4.60120.0406Metric Values ➢Classes & Tolerances ➢8-UN3434 7/8 - 8 8-UN4.87580.12504.79380.06770.03134.76130.48°4.72620.0406Metric Values ➢Classes & Tolerances ➢8-UN3485 - 8 8-UN580.12504.91880.06770.03134.88630.46°4.85120.0406Metric Values ➢Classes & Tolerances ➢8-UN3535 1/8 - 8 8-UN5.12580.12505.04380.06770.03135.01130.45°4.97620.0406Metric Values ➢Classes & Tolerances ➢8-UN3585 1/4 - 8 8-UN5.2580.12505.16880.06770.03135.13630.44°5.10120.0406Metric Values ➢Classes & Tolerances ➢8-UN3635 3/8 - 8 8-UN5.37580.12505.29380.06770.03135.26130.43°5.22620.0406Metric Values ➢Classes & Tolerances ➢8-UN3685 1/2 - 8 8-UN5.580.12505.41880.06770.03135.38630.42°5.35120.0406Metric Values ➢Classes & Tolerances ➢8-UN3735 5/8 - 8 8-UN5.62580.12505.54380.06770.03135.51130.41°5.47620.0406Metric Values ➢Classes & Tolerances ➢8-UN3785 3/4 - 8 8-UN5.7580.12505.66880.06770.03135.63630.4°5.60120.0406Metric Values ➢Classes & Tolerances ➢8-UN3835 7/8 - 8 8-UN5.87580.12505.79380.06770.03135.76130.39°5.72620.0406Metric Values ➢Classes & Tolerances ➢8-UN3886 - 8 8-UN680.12505.91880.06770.03135.88630.39°5.85120.0406Metric Values ➢Classes & Tolerances ➢8-UN393limits of Thread Dimensions (UNC, UNF & UNEF)To manufacture or measure a thread, one has to know the maximum and minimum permissible values of the basic dimensions. These values are calculated according to the thread class (See below). To understand classes, you first need to understand the terms Allowance (Sometimes referred to as deviation) and Tolerances.Definition of terms:Allowance (Deviation): The minimum permissible distance between the basic and actual profile.Tolerance: The width of the tolerance field of a diameter on the actual thread profile. (Pitch, Major & Minor diameters)A small allowance means that the assembly of a male and female thread will be harder, but after assembly, there will be less freedom of movement.A large allowance means that the assembly of a male and female thread will be easier, but after assembly, there will be more freedom of movement.The allowance size does not influence a thread’s production difficulty or price.A wide tolerance is easier and cheaper to produce but yields a larger spread between threads.A narrow tolerance is challenging to produce and more expensive but yields a smaller spread between threads.Unified Thread ClassesThe class is defined by a two-character code.The first character defines is a digit between 1 and 3. 1=Loose fit, 2=Medium fit, and 3=Tight fit.The second character is a letter. A=External thread and B=Internal thread.In the Unified Inch thread system, only classes 1A & 2A have an allowance. The allowance for the two classes is the same.The other 4 classes have an allowance of Zero.All the internal thread profiles (B classes) have no allowance.Classes 1A & 1B: These classes are suitable for applications where a liberal tolerance and allowance are required to permit easy assembly. The maximum diameters of Class 1A threads are smaller than the basic diameter by the allowance amount. The minimum diameters of Class 1B threads are equal to the basic diameters and consequently afford no allowance at maximum material condition.Classes 2A & 2B: Classes 2A (external) and 2B (internal) are the default classes used for the commercial production of Nut, Bols, and otehr threaded fasteners. They are the default class unless otherwise specified. they have the same allowance as classes 1A/1B. However, they have a narrower tolerance field. The difficulty of assembly is the same, but the spread between different parts in a production batch is smaller.Classes 3A & 3B: These classes are suitable for applications where tight fit and accuracy of thread elements are essential. The maximum diameters of Class 3A threads and the minimum diameters of Class 3B threads are the same (Both have zero allowance). The accuracy is high, but the assembly is difficult.Combinations of Classes: The engineer can select any valid class for the male and female threads to achieve his design goals. The valid classes are defined in ASTM B1.1 as follows:Classes 2A, 2A, 3B, and 3B are always valid.Classes 1A & 1B are valid only for UNC threads with a nominal diameter equal to or larger than 1/4″.Unified Thread Allowance.The allowance es should be calculated for external threads with classes 1A and 2A. The allowance of both classes is the same and equals 0.3 times the pitch diameter tolerance of class 2A. It is the function of 3 parameters.D – Basic (nominal diameter)P – Pitch (1/TPI)LE – Length of engagement. If not explicitly specified, the length of engagement is assumed to be 5 pitches. (LE=5*P)All parameters are in inches$ \large es = 0.3 \times \left [ 0.0015 \times \sqrt[3]{D} + 0.0015 \times \sqrt{LE} + 0.015 \times \sqrt[3]{P^{2}} \right ] $\begin{array} \large \,es& = 0.3 \times\,[\,0.0015 \times \sqrt[3]{D} &\\ & +\,0.0015 \times \sqrt{LE}&\\ & + 0.015 \times \sqrt[3]{P^{2}}\,] \end{array}The result should be rounded to 6 decimal places.ASTM B1.1 lists in a long chart the allowance for each thread size. However, the results of this formula are 100% accurate, and there is no need to browse the chart.You can use our Advanced Threading Calculator to obtain the allowance according to a thread description or use the mini-calculator below.Unified Thread Allowance CalculatorPayment options Unified Thread TolerancesThe tolerances TD for internal threads and Td for external threads are derived from the class. The tolerances can be calculated according to the below formulas.Td – Tolerance for External Major DiameterTd2 – Tolerance for External Pitch DiameterTD1 – Tolerance for Internal Minor DiameterTD2 – Tolerance for Internal Pitch DiameterT – Base Tolerance (The tolerance of CLASS 2A pitch diameter is the base tolerance from which other tolerances are derived)D – Basic thread diameter.P – Pitch (1/TPI).LE – Length of engagement. (If unknown, the default is 5 * P)All input parameters and results are in Inches.Base Tolerance Formula$ \large T = 0.0015 \times \sqrt[3]{D} + 0.0015 \times \sqrt{LE} + 0.015 \times \sqrt[3]{P^{2}}$\begin{array} \large \,T& = \,0.0015 \times \sqrt[3]{D} &\\ & +\,0.0015 \times \sqrt{LE}&\\ & + 0.015 \times \sqrt[3]{P^{2}} \end{array}Formulas for External thread(Classes 1A,2A & 3A)$ \large T_{d(1A)} = 0.3 \times T $$ \large T_{d2(1A)} = 1.5 \times T $$ \large T_{d(2A)} = 0.06 \times \sqrt[3]{P^2} $$ \large T_{d2(2A)} = T $$ \large T_{d(3A)} = 0.06 \times \sqrt[3]{P^2} $$ \large T_{d2(3A)} = 0.75 \times T $Formulas for Internal Thread(Classes 1B,2B & 3B)$ \large T_{d1(1B)} = 0.25 \times P\,-\,0.4 \times P^{2} $$ \large T_{d2(1B)} = 1.95 \times T $$ \large T_{d1(2B)} = 0.25 \times P\,-\,0.4 \times P^{2} $$ \large T_{d2(2B)} = 1.30 \times T $$\begin{array}{ll} \large T_{d1(3B)}=&0.05 \times \sqrt[3]{P} + &\\ &0.003 \times \frac{P}{D}\,-\,0.002 \end{array} $$ \large T_{d2(3B)} = 0.975 \times T $The above formulas can be used in most cases. However, ASTM B1.1 lists various scenarios where other formulas or quirky rounding rules apply. Use our Advanced Threading Calculator to get exact results for any thread.Usage notes for the above formulas:The result should be rounded to 6 decimal places.Formulas for external threads are valid for all threads.Formulas for internal threads are valid only for thread diameters above 1/4″, a pitch between 4 and 80 TPI, and engagement lengths up to 1.5 X D.In some cases, ASTM B1.1 dictates special rounding rules.You can use the Threading Calculator, which automatically considers all the above rules.Unified Thread limits CalculationsOnce the Td, TD, & es values are known, the final limits can be calculated according to the formulas below.Formulas for Limits of a Unified Inch External Thread$ \large d_{max}=d-{es} $$ \large d_{min}=d_{max}-T_d $$ \large d_{2max} = d2 – es $$ \large d_{2min}=d_{2max}-T_{d2} $Formulas for Limits of a Unified Inch InternalThread$ \large D_{1min}=D $$ \large D_{1max}=D_{1min}+T_{D1} $$ \large D_{2minx} = D_2 $$ \large D_{2max}=D_{2min}+ T_{D2} $Related Glossary Terms:PitchThread Allowance (es)Major DiameterTooth per inch (tpi)Lead (Threading)Minor DiameterPitch DiameterFundamental TriangleThread Height (Depth)Thread addendumTap Drill SizeMaximum material condition (MMC)Length of Engagement

The tolerances TD for internal threads and Td for external threads are derived from the class. The tolerances can be calculated according to the below formulas.Td – Tolerance for External Major DiameterTd2 – Tolerance for External Pitch DiameterTD1 – Tolerance for Internal Minor DiameterTD2 – Tolerance for Internal Pitch DiameterT – Base Tolerance (The tolerance of CLASS 2A pitch diameter is the base tolerance from which other tolerances are derived)D – Basic thread diameter.P – Pitch (1/TPI).LE – Length of engagement. (If unknown, the default is 5 * P)All input parameters and results are in Inches.Base Tolerance Formula$ \large T = 0.0015 \times \sqrt[3]{D} + 0.0015 \times \sqrt{LE} + 0.015 \times \sqrt[3]{P^{2}}$\begin{array} \large \,T& = \,0.0015 \times \sqrt[3]{D} &\\ & +\,0.0015 \times \sqrt{LE}&\\ & + 0.015 \times \sqrt[3]{P^{2}} \end{array}Formulas for External thread(Classes 1A,2A & 3A)$ \large T_{d(1A)} = 0.3 \times T $$ \large T_{d2(1A)} = 1.5 \times T $$ \large T_{d(2A)} = 0.06 \times \sqrt[3]{P^2} $$ \large T_{d2(2A)} = T $$ \large T_{d(3A)} = 0.06 \times \sqrt[3]{P^2} $$ \large T_{d2(3A)} = 0.75 \times T $Formulas for Internal Thread(Classes 1B,2B & 3B)$ \large T_{d1(1B)} = 0.25 \times P\,-\,0.4 \times P^{2} $$ \large T_{d2(1B)} = 1.95 \times T $$ \large T_{d1(2B)} = 0.25 \times P\,-\,0.4 \times P^{2} $$ \large T_{d2(2B)} = 1.30 \times T $$\begin{array}{ll} \large T_{d1(3B)}=&0.05 \times \sqrt[3]{P} + &\\ &0.003 \times \frac{P}{D}\,-\,0.002 \end{array} $$ \large T_{d2(3B)} = 0.975 \times T $The above formulas can be used in most cases. However, ASTM B1.1 lists various scenarios where other formulas or quirky rounding rules apply. Use our Advanced Threading Calculator to get exact results for any thread.Usage notes for the above formulas:The result should be rounded to 6 decimal places.Formulas for external threads are valid for all threads.Formulas for internal threads are valid only for thread diameters above 1/4″, a pitch between 4 and 80 TPI, and engagement lengths up to 1.5 X D.In some cases, ASTM B1.1 dictates special rounding rules.You can use the Threading Calculator, which automatically considers all the above rules.Unified Thread limits CalculationsOnce the Td, TD, & es values are known, the final limits can be calculated according to the formulas below.Formulas for Limits of a Unified Inch External Thread$ \large d_{max}=d-{es} $$ \large d_{min}=d_{max}-T_d $$ \large d_{2max} = d2 – es $$ \large d_{2min}=d_{2max}-T_{d2} $Formulas for Limits of a Unified Inch InternalThread$ \large D_{1min}=D $$ \large D_{1max}=D_{1min}+T_{D1} $$ \large D_{2minx} = D_2 $$ \large D_{2max}=D_{2min}+ T_{D2} $Related Glossary Terms:PitchThread Allowance (es)Major DiameterTooth per inch (tpi)Lead (Threading)Minor DiameterPitch DiameterFundamental TriangleThread Height (Depth)Thread addendumTap Drill SizeMaximum material condition (MMC)Length of Engagement

Class:The class is defined by a two-character code.The first character is a digit between 1 and 3. 3=Tight fit, 2=Medium fit, and 1=Loose fit.The second character is a letter. A=External thread and B=Internal thread.For a detailed explanation of classes, read the dedicated section below.Additional Parameters:Direction: By default, the thread is right-hand. For a left-hand thread, add the suffix -LH.Number of Starts: By default, all threads have a single start. Thus the lead equals the pitch. For a multiple-start thread, the lead is also indicated. For example: 3/4– 0.0625P – 0.1875L UNF denotes a 3/4″ UNF thread with 3 starts. (0.1875/0.0625=3)Designation Examples of Unified ThreadsDesignationThread SeriesInternal /ExternalNominalDiameterTPIPitchLeadClassNumber of StartsThreadDirection#8-32 UNCUNCundefined0.164"320.03125"0.03125"undefined1Right hand1/4 -28 UNF-2AUNFExternal0.25"280.0357"0.0357"2A1Right hand3/4-20 UNEF-3BUNEFInternal0.75"200.05"0.05"3B1Right hand1-12 UN-1AConstant Pitch12 TPIExternal1"120.0833"0.0833"1A1Right hand3/4– 0.0625P – 0.1875L UNF-2AUNFExternal0.75"160.0625"0.1875"2A3Right hand1/4 -28 UNF-2A-LHUNFExternal0.25"280.0357"0.0357"2A1Left handPossible Combinations (Diameter/Pitch)The charts below show all the possible thread combinations that are defined in ASTM B1.1UNC– Unified Inch Coarse Thread SeriesUNF – Unified Inch Fine Thread SeriesUNEF – Unified Inch Extra Fine Thread Series

The Unified Thread Standard (UTS) defines a 60° thread form in Inch dimensions as described in the ASME B1.1 standard. It is the North American equivalent of the ISO metric thread system. The UTS serves as the leading standard for bolts, nuts, and a wide variety of other threaded fasteners used in the USA and Canada. However, in recent years the metric thread standard is becoming more common.The standard defines diameter and pitch combinations along with allowances, tolerances, and designations. It has the same 60° profile as the ISO metric screw thread, but the basic dimensions of each UTS thread were chosen as an inch fraction rather than a millimeter value.DesignationBasic designation syntax:Nominal Diameter in Inch FractionPitch in TPISeries: UNC / UNF / UNEF / UNClass: 1A, 2A, 3A, 1B, 2B or 3B.Diameter:From 1/4″ and above the diameters are given in inch fractions. For example 1/4″, 3/4″, 1 1/4″.Below 1/4″ the diameters are given by a series of numbers from #0 to #12. Each “number” describes an arbitrary diameter as shown in the below table.It is also allowed to denote the diameters with a decimal value. For example 0.250 (1/4″), 0.4375 (7/16″), etc.Standard Diameter numbers below 1/4″DiameterNumber#0#1#2#3#4#5#6#8#10#12Diameter(Inch)0.060.0730.0860.0990.1120.1250.1380.1640.190.216Diameter(mm)1.5241.85422.18442.51462.84483.1753.50524.16564.82605.4864Pitch:By default, the pitch is given in TPI. For example, 1/4-20 means a thread with a pitch of 20 TPI (1/20=0.05″).It is also allowed to denote the pitch by distance. For example, 1/4-0.05P means a thread with a pitch of 0.05″ (same as 20 TPI).Series:In most cases, the series will be UNC, UNF, or UNEF (Coarse, Fine, or Extra fine pitch).ASTM B1.1, also defines several constant pitch series. These are denoted by

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The above formulas can be used in most cases. However, ASTM B1.1 lists various scenarios where other formulas or quirky rounding rules apply. Use our Advanced Threading Calculator to get exact results for any thread.Usage notes for the above formulas:The result should be rounded to 6 decimal places.Formulas for external threads are valid for all threads.Formulas for internal threads are valid only for thread diameters above 1/4″, a pitch between 4 and 80 TPI, and engagement lengths up to 1.5 X D.In some cases, ASTM B1.1 dictates special rounding rules.You can use the Threading Calculator, which automatically considers all the above rules.Unified Thread limits CalculationsOnce the Td, TD, & es values are known, the final limits can be calculated according to the formulas below.Formulas for Limits of a Unified Inch External Thread$ \large d_{max}=d-{es} $$ \large d_{min}=d_{max}-T_d $$ \large d_{2max} = d2 – es $$ \large d_{2min}=d_{2max}-T_{d2} $Formulas for Limits of a Unified Inch InternalThread$ \large D_{1min}=D $$ \large D_{1max}=D_{1min}+T_{D1} $$ \large D_{2minx} = D_2 $$ \large D_{2max}=D_{2min}+ T_{D2} $Related Glossary Terms:PitchThread Allowance (es)Major DiameterTooth per inch (tpi)Lead (Threading)Minor DiameterPitch DiameterFundamental TriangleThread Height (Depth)Thread addendumTap Drill SizeMaximum material condition (MMC)Length of Engagement

Base Tolerance Formula$ \large T = 0.0015 \times \sqrt[3]{D} + 0.0015 \times \sqrt{LE} + 0.015 \times \sqrt[3]{P^{2}}$\begin{array} \large \,T& = \,0.0015 \times \sqrt[3]{D} &\\ & +\,0.0015 \times \sqrt{LE}&\\ & + 0.015 \times \sqrt[3]{P^{2}} \end{array}Formulas for External thread(Classes 1A,2A & 3A)$ \large T_{d(1A)} = 0.3 \times T $$ \large T_{d2(1A)} = 1.5 \times T $$ \large T_{d(2A)} = 0.06 \times \sqrt[3]{P^2} $$ \large T_{d2(2A)} = T $$ \large T_{d(3A)} = 0.06 \times \sqrt[3]{P^2} $$ \large T_{d2(3A)} = 0.75 \times T $Formulas for Internal Thread(Classes 1B,2B & 3B)$ \large T_{d1(1B)} = 0.25 \times P\,-\,0.4 \times P^{2} $$ \large T_{d2(1B)} = 1.95 \times T $$ \large T_{d1(2B)} = 0.25 \times P\,-\,0.4 \times P^{2} $$ \large T_{d2(2B)} = 1.30 \times T $$\begin{array}{ll} \large T_{d1(3B)}=&0.05 \times \sqrt[3]{P} + &\\ &0.003 \times \frac{P}{D}\,-\,0.002 \end{array} $$ \large T_{d2(3B)} = 0.975 \times T $The above formulas can be used in most cases. However, ASTM B1.1 lists various scenarios where other formulas or quirky rounding rules apply. Use our Advanced Threading Calculator to get exact results for any thread.Usage notes for the above formulas:The result should be rounded to 6 decimal places.Formulas for external threads are valid for all threads.Formulas for internal threads are valid only for thread diameters above 1/4″, a pitch between 4 and 80 TPI, and engagement lengths up to 1.5 X D.In some cases, ASTM B1.1 dictates special rounding rules.You can use the Threading Calculator, which automatically considers all the above rules.Unified Thread limits CalculationsOnce the Td, TD, & es values are known, the final limits can be calculated according to the formulas below.Formulas for Limits of a Unified Inch External Thread$ \large d_{max}=d-{es} $$ \large d_{min}=d_{max}-T_d $$ \large d_{2max} = d2 – es $$ \large d_{2min}=d_{2max}-T_{d2} $Formulas for Limits of a Unified Inch InternalThread$ \large D_{1min}=D $$ \large D_{1max}=D_{1min}+T_{D1} $$ \large D_{2minx} = D_2 $$ \large D_{2max}=D_{2min}+ T_{D2} $Related Glossary Terms:PitchThread Allowance (es)Major DiameterTooth per inch (tpi)Lead (Threading)Minor DiameterPitch DiameterFundamental TriangleThread Height (Depth)Thread addendumTap Drill SizeMaximum material condition (MMC)Length of Engagement

Metricthread calculatorExcel

Click the Thread Link to get the Full Thread Data for all classesAll dimensions are in inches. To view the Metric translation, click the Thread LinkClick icon to show Additional columnsClick icon to show Full Thread DataThreadBasic DiamTPIPitchPitch DiamThread HeightCres/ RootTap Drill SizeLead AngleMinor DiameterThread addendumseriesid9/16 - 12 12-UN0.562120.08330.50790.04510.02080.48622.99°0.46280.0271Metric Values ➢Classes & Tolerances ➢12-UN625/8 - 12 12-UN0.625120.08330.57090.04510.02080.54922.66°0.52580.0271Metric Values ➢Classes & Tolerances ➢12-UN7011/16 - 12 12-UN0.687120.08330.63290.04510.02080.61122.4°0.58780.0271Metric Values ➢Classes & Tolerances ➢12-UN763/4 - 12 12-UN0.75120.08330.69590.04510.02080.67422.18°0.65080.0271Metric Values ➢Classes & Tolerances ➢12-UN8413/16 - 12 12-UN0.812120.08330.75790.04510.02080.73622°0.71280.0271Metric Values ➢Classes & Tolerances ➢12-UN907/8 - 12 12-UN0.875120.08330.82090.04510.02080.79921.85°0.77580.0271Metric Values ➢Classes & Tolerances ➢12-UN9815/16 - 12 12-UN0.937120.08330.88290.04510.02080.86121.72°0.83780.0271Metric Values ➢Classes & Tolerances ➢12-UN1041 - 12 12-UN1120.08330.94590.04510.02080.92421.61°0.90080.0271Metric Values ➢Classes & Tolerances ➢12-UN1131 1/16 - 12 12-UN1.062120.08331.00790.04510.02080.98621.51°0.96280.0271Metric Values ➢Classes & Tolerances ➢12-UN1201 1/8 - 12 12-UN1.125120.08331.07090.04510.02081.04921.42°1.02580.0271Metric Values ➢Classes & Tolerances ➢12-UN1281 3/16 - 12 12-UN1.187120.08331.13290.04510.02081.11121.34°1.08780.0271Metric Values ➢Classes & Tolerances ➢12-UN1341 1/4 - 12 12-UN1.25120.08331.19590.04510.02081.17421.27°1.15080.0271Metric Values ➢Classes & Tolerances ➢12-UN1421 5/16 - 12 12-UN1.312120.08331.25790.04510.02081.23621.21°1.21280.0271Metric Values ➢Classes & Tolerances ➢12-UN1481 3/8 - 12 12-UN1.375120.08331.32090.04510.02081.29921.15°1.27580.0271Metric Values ➢Classes & Tolerances ➢12-UN1571 7/16 - 12 12-UN1.437120.08331.38290.04510.02081.36121.1°1.33780.0271Metric Values ➢Classes & Tolerances ➢12-UN1641 1/2 - 12 12-UN1.5120.08331.44590.04510.02081.42421.05°1.40080.0271Metric Values ➢Classes & Tolerances ➢12-UN1731 9/16 - 12 12-UN1.562120.08331.50790.04510.02081.48621.01°1.46280.0271Metric Values ➢Classes & Tolerances ➢12-UN1801 5/8 - 12 12-UN1.625120.08331.57090.04510.02081.54920.97°1.52580.0271Metric Values ➢Classes & Tolerances ➢12-UN1861 11/16 - 12 12-UN1.687120.08331.63290.04510.02081.61120.93°1.58780.0271Metric Values ➢Classes & Tolerances ➢12-UN1921 3/4 - 12 12-UN1.75120.08331.69590.04510.02081.67420.9°1.65080.0271Metric Values ➢Classes & Tolerances ➢12-UN1981 13/16 - 12 12-UN1.812120.08331.75790.04510.02081.73620.86°1.71280.0271Metric Values ➢Classes & Tolerances ➢12-UN2031 7/8 - 12 12-UN1.875120.08331.82090.04510.02081.79920.83°1.77580.0271Metric Values ➢Classes & Tolerances ➢12-UN2081 15/16 - 12 12-UN1.937120.08331.88290.04510.02081.86120.81°1.83780.0271Metric Values ➢Classes & Tolerances ➢12-UN2132 - 12 12-UN2120.08331.94590.04510.02081.92420.78°1.90080.0271Metric Values ➢Classes & Tolerances ➢12-UN2192 1/8 - 12 12-UN2.125120.08332.07090.04510.02082.04920.73°2.02580.0271Metric Values ➢Classes & Tolerances ➢12-UN2242 1/4 - 12 12-UN2.25120.08332.19590.04510.02082.17420.69°2.15080.0271Metric Values ➢Classes & Tolerances ➢12-UN2302 3/8 - 12 12-UN2.375120.08332.32090.04510.02082.29920.65°2.27580.0271Metric Values ➢Classes & Tolerances ➢12-UN2352 1/2 - 12 12-UN2.5120.08332.44590.04510.02082.42420.62°2.40080.0271Metric Values ➢Classes & Tolerances ➢12-UN2422 5/8 - 12 12-UN2.625120.08332.57090.04510.02082.54920.59°2.52580.0271Metric Values ➢Classes & Tolerances ➢12-UN2482 3/4 - 12 12-UN2.75120.08332.69590.04510.02082.67420.56°2.65080.0271Metric Values ➢Classes & Tolerances ➢12-UN2552 7/8 - 12 12-UN2.875120.08332.82090.04510.02082.79920.54°2.77580.0271Metric Values ➢Classes & Tolerances ➢12-UN2613 - 12 12-UN3120.08332.94590.04510.02082.92420.52°2.90080.0271Metric Values ➢Classes & Tolerances ➢12-UN2683 1/8 - 12 12-UN3.125120.08333.07090.04510.02083.04920.49°3.02580.0271Metric Values ➢Classes & Tolerances ➢12-UN2743 1/4 - 12 12-UN3.25120.08333.19590.04510.02083.17420.48°3.15080.0271Metric Values ➢Classes & Tolerances ➢12-UN2803 3/8 - 12 12-UN3.375120.08333.32090.04510.02083.29920.46°3.27580.0271Metric Values ➢Classes & Tolerances ➢12-UN2853 1/2 - 12 12-UN3.5120.08333.44590.04510.02083.42420.44°3.40080.0271Metric Values ➢Classes & Tolerances ➢12-UN2913 5/8 - 12 12-UN3.625120.08333.57090.04510.02083.54920.43°3.52580.0271Metric Values ➢Classes & Tolerances ➢12-UN2963 3/4 - 12 12-UN3.75120.08333.69590.04510.02083.67420.41°3.65080.0271Metric Values ➢Classes & Tolerances ➢12-UN3023 7/8 - 12 12-UN3.875120.08333.82090.04510.02083.79920.4°3.77580.0271Metric Values ➢Classes & Tolerances ➢12-UN3074 - 12 12-UN4120.08333.94590.04510.02083.92420.39°3.90080.0271Metric Values ➢Classes & Tolerances ➢12-UN3134 1/8 - 12 12-UN4.125120.08334.07090.04510.02084.04920.37°4.02580.0271Metric Values ➢Classes & Tolerances ➢12-UN3184 1/4 - 12 12-UN4.25120.08334.19590.04510.02084.17420.36°4.15080.0271Metric Values ➢Classes & Tolerances ➢12-UN3234 3/8 - 12 12-UN4.375120.08334.32090.04510.02084.29920.35°4.27580.0271Metric Values ➢Classes & Tolerances ➢12-UN3284 1/2 - 12 12-UN4.5120.08334.44590.04510.02084.42420.34°4.40080.0271Metric Values ➢Classes & Tolerances ➢12-UN3334 5/8 - 12 12-UN4.625120.08334.57090.04510.02084.54920.33°4.52580.0271Metric Values ➢Classes & Tolerances ➢12-UN3384 3/4 - 12 12-UN4.75120.08334.69590.04510.02084.67420.32°4.65080.0271Metric Values ➢Classes & Tolerances ➢12-UN3444 7/8 - 12 12-UN4.875120.08334.82090.04510.02084.79920.32°4.77580.0271Metric Values ➢Classes & Tolerances ➢12-UN3495 - 12 12-UN5120.08334.94590.04510.02084.92420.31°4.90080.0271Metric Values ➢Classes & Tolerances ➢12-UN3545 1/8 - 12 12-UN5.125120.08335.07090.04510.02085.04920.3°5.02580.0271Metric Values ➢Classes & Tolerances ➢12-UN3595 1/4 - 12 12-UN5.25120.08335.19590.04510.02085.17420.29°5.15080.0271Metric Values ➢Classes & Tolerances ➢12-UN3645 3/8 - 12 12-UN5.375120.08335.32090.04510.02085.29920.29°5.27580.0271Metric Values ➢Classes & Tolerances ➢12-UN3695 1/2 - 12 12-UN5.5120.08335.44590.04510.02085.42420.28°5.40080.0271Metric Values ➢Classes & Tolerances ➢12-UN3745 5/8 - 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8 8-UN2.7580.12502.66880.06770.03132.63630.85°2.60120.0406Metric Values ➢Classes & Tolerances ➢8-UN2542 7/8 - 8 8-UN2.87580.12502.79380.06770.03132.76130.82°2.72620.0406Metric Values ➢Classes & Tolerances ➢8-UN2603 - 8 8-UN380.12502.91880.06770.03132.88630.78°2.85120.0406Metric Values ➢Classes & Tolerances ➢8-UN2673 1/8 - 8 8-UN3.12580.12503.04380.06770.03133.01130.75°2.97620.0406Metric Values ➢Classes & Tolerances ➢8-UN2733 1/4 - 8 8-UN3.2580.12503.16880.06770.03133.13630.72°3.10120.0406Metric Values ➢Classes & Tolerances ➢8-UN2793 3/8 - 8 8-UN3.37580.12503.29380.06770.03133.26130.69°3.22620.0406Metric Values ➢Classes & Tolerances ➢8-UN2843 1/2 - 8 8-UN3.580.12503.41880.06770.03133.38630.67°3.35120.0406Metric Values ➢Classes & Tolerances ➢8-UN2903 5/8 - 8 8-UN3.62580.12503.54380.06770.03133.51130.64°3.47620.0406Metric Values ➢Classes & Tolerances ➢8-UN2953 3/4 - 8 8-UN3.7580.12503.66880.06770.03133.63630.62°3.60120.0406Metric Values ➢Classes & Tolerances ➢8-UN3013 7/8 - 8 8-UN3.87580.12503.79380.06770.03133.76130.6°3.72620.0406Metric Values ➢Classes & Tolerances ➢8-UN3064 - 8 8-UN480.12503.91880.06770.03133.88630.58°3.85120.0406Metric Values ➢Classes & Tolerances ➢8-UN3124 1/8 - 8 8-UN4.12580.12504.04380.06770.03134.01130.56°3.97620.0406Metric Values ➢Classes & Tolerances ➢8-UN3174 1/4 - 8 8-UN4.2580.12504.16880.06770.03134.13630.55°4.10120.0406Metric Values ➢Classes & Tolerances ➢8-UN3224 3/8 - 8 8-UN4.37580.12504.29380.06770.03134.26130.53°4.22620.0406Metric Values ➢Classes & Tolerances ➢8-UN3274 1/2 - 8 8-UN4.580.12504.41880.06770.03134.38630.52°4.35120.0406Metric Values ➢Classes & Tolerances ➢8-UN3324 5/8 - 8 8-UN4.62580.12504.54380.06770.03134.51130.5°4.47620.0406Metric Values ➢Classes & Tolerances ➢8-UN3374 3/4 - 8 8-UN4.7580.12504.66880.06770.03134.63630.49°4.60120.0406Metric Values ➢Classes & Tolerances ➢8-UN3434 7/8 - 8 8-UN4.87580.12504.79380.06770.03134.76130.48°4.72620.0406Metric Values ➢Classes & Tolerances ➢8-UN3485 - 8 8-UN580.12504.91880.06770.03134.88630.46°4.85120.0406Metric Values ➢Classes & Tolerances ➢8-UN3535 1/8 - 8 8-UN5.12580.12505.04380.06770.03135.01130.45°4.97620.0406Metric Values ➢Classes & Tolerances ➢8-UN3585 1/4 - 8 8-UN5.2580.12505.16880.06770.03135.13630.44°5.10120.0406Metric Values ➢Classes & Tolerances ➢8-UN3635 3/8 - 8 8-UN5.37580.12505.29380.06770.03135.26130.43°5.22620.0406Metric Values ➢Classes & Tolerances ➢8-UN3685 1/2 - 8 8-UN5.580.12505.41880.06770.03135.38630.42°5.35120.0406Metric Values ➢Classes & Tolerances ➢8-UN3735 5/8 - 8 8-UN5.62580.12505.54380.06770.03135.51130.41°5.47620.0406Metric Values ➢Classes & Tolerances ➢8-UN3785 3/4 - 8 8-UN5.7580.12505.66880.06770.03135.63630.4°5.60120.0406Metric Values ➢Classes & Tolerances ➢8-UN3835 7/8 - 8 8-UN5.87580.12505.79380.06770.03135.76130.39°5.72620.0406Metric Values ➢Classes & Tolerances ➢8-UN3886 - 8 8-UN680.12505.91880.06770.03135.88630.39°5.85120.0406Metric Values ➢Classes & Tolerances ➢8-UN393limits of Thread Dimensions (UNC, UNF & UNEF)To manufacture or measure a thread, one has to know the maximum and minimum permissible values of the basic dimensions. These values are calculated according to the thread class (See below). To understand classes, you first need to understand the terms Allowance (Sometimes referred to as deviation) and Tolerances.Definition of terms:Allowance (Deviation): The minimum permissible distance between the basic and actual profile.Tolerance: The width of the tolerance field of a diameter on the actual thread profile. (Pitch, Major & Minor diameters)A small allowance means that the assembly of a male and female thread will be harder, but after assembly, there will be less freedom of movement.A large allowance means that the assembly of a male and female thread will be easier, but after assembly, there will be more freedom of movement.The allowance size does not influence a thread’s production difficulty or price.A wide tolerance is easier and cheaper to produce but yields a larger spread between threads.A narrow tolerance is challenging to produce and more expensive but yields a smaller spread between threads.Unified Thread ClassesThe class is defined by a two-character code.The first character defines is a digit between 1 and 3. 1=Loose fit, 2=Medium fit, and 3=Tight fit.The second character is a letter. A=External thread and B=Internal thread.In the Unified Inch thread system, only classes 1A & 2A have an allowance. The allowance for the two classes is the same.The other 4 classes have an allowance of Zero.All the internal thread profiles (B classes) have no allowance.Classes 1A & 1B: These classes are suitable for applications where a liberal tolerance and allowance are required to permit easy assembly. The maximum diameters of Class 1A threads are smaller than the basic diameter by the allowance amount. The minimum diameters of Class 1B threads are equal to the basic diameters and consequently afford no allowance at maximum material condition.Classes 2A & 2B: Classes 2A (external) and 2B (internal) are the default classes used for the commercial production of Nut, Bols, and otehr threaded fasteners. They are the default class unless otherwise specified. they have the same allowance as classes 1A/1B. However, they have a narrower tolerance field. The difficulty of assembly is the same, but the spread between different parts in a production batch is smaller.Classes 3A & 3B: These classes are suitable for applications where tight fit and accuracy of thread elements are essential. The maximum diameters of Class 3A threads and the minimum diameters of Class 3B threads are the same (Both have zero allowance). The accuracy is high, but the assembly is difficult.Combinations of Classes: The engineer can select any valid class for the male and female threads to achieve his design goals. The valid classes are defined in ASTM B1.1 as follows:Classes 2A, 2A, 3B, and 3B are always valid.Classes 1A & 1B are valid only for UNC threads with a nominal diameter equal to or larger than 1/4″.Unified Thread Allowance.The allowance es should be calculated for external threads with classes 1A and 2A. The allowance of both classes is the same and equals 0.3 times the pitch diameter tolerance of class 2A. It is the function of 3 parameters.D – Basic (nominal diameter)P – Pitch (1/TPI)LE – Length of engagement. If not explicitly specified, the length of engagement is assumed to be 5 pitches. (LE=5*P)All parameters are in inches$ \large es = 0.3 \times \left [ 0.0015 \times \sqrt[3]{D} + 0.0015 \times \sqrt{LE} + 0.015 \times \sqrt[3]{P^{2}} \right ] $\begin{array} \large \,es& = 0.3 \times\,[\,0.0015 \times \sqrt[3]{D} &\\ & +\,0.0015 \times \sqrt{LE}&\\ & + 0.015 \times \sqrt[3]{P^{2}}\,] \end{array}The result should be rounded to 6 decimal places.ASTM B1.1 lists in a long chart the allowance for each thread size. However, the results of this formula are 100% accurate, and there is no need to browse the chart.You can use our Advanced Threading Calculator to obtain the allowance according to a thread description or use the mini-calculator below.Unified Thread Allowance CalculatorPayment options Unified Thread TolerancesThe tolerances TD for internal threads and Td for external threads are derived from the class. The tolerances can be calculated according to the below formulas.Td – Tolerance for External Major DiameterTd2 – Tolerance for External Pitch DiameterTD1 – Tolerance for Internal Minor DiameterTD2 – Tolerance for Internal Pitch DiameterT – Base Tolerance (The tolerance of CLASS 2A pitch diameter is the base tolerance from which other tolerances are derived)D – Basic thread diameter.P – Pitch (1/TPI).LE – Length of engagement. (If unknown, the default is 5 * P)All input parameters and results are in Inches.Base Tolerance Formula$ \large T = 0.0015 \times \sqrt[3]{D} + 0.0015 \times \sqrt{LE} + 0.015 \times \sqrt[3]{P^{2}}$\begin{array} \large \,T& = \,0.0015 \times \sqrt[3]{D} &\\ & +\,0.0015 \times \sqrt{LE}&\\ & + 0.015 \times \sqrt[3]{P^{2}} \end{array}Formulas for External thread(Classes 1A,2A & 3A)$ \large T_{d(1A)} = 0.3 \times T $$ \large T_{d2(1A)} = 1.5 \times T $$ \large T_{d(2A)} = 0.06 \times \sqrt[3]{P^2} $$ \large T_{d2(2A)} = T $$ \large T_{d(3A)} = 0.06 \times \sqrt[3]{P^2} $$ \large T_{d2(3A)} = 0.75 \times T $Formulas for Internal Thread(Classes 1B,2B & 3B)$ \large T_{d1(1B)} = 0.25 \times P\,-\,0.4 \times P^{2} $$ \large T_{d2(1B)} = 1.95 \times T $$ \large T_{d1(2B)} = 0.25 \times P\,-\,0.4 \times P^{2} $$ \large T_{d2(2B)} = 1.30 \times T $$\begin{array}{ll} \large T_{d1(3B)}=&0.05 \times \sqrt[3]{P} + &\\ &0.003 \times \frac{P}{D}\,-\,0.002 \end{array} $$ \large T_{d2(3B)} = 0.975 \times T $The above formulas can be used in most cases. However, ASTM B1.1 lists various scenarios where other formulas or quirky rounding rules apply. Use our Advanced Threading Calculator to get exact results for any thread.Usage notes for the above formulas:The result should be rounded to 6 decimal places.Formulas for external threads are valid for all threads.Formulas for internal threads are valid only for thread diameters above 1/4″, a pitch between 4 and 80 TPI, and engagement lengths up to 1.5 X D.In some cases, ASTM B1.1 dictates special rounding rules.You can use the Threading Calculator, which automatically considers all the above rules.Unified Thread limits CalculationsOnce the Td, TD, & es values are known, the final limits can be calculated according to the formulas below.Formulas for Limits of a Unified Inch External Thread$ \large d_{max}=d-{es} $$ \large d_{min}=d_{max}-T_d $$ \large d_{2max} = d2 – es $$ \large d_{2min}=d_{2max}-T_{d2} $Formulas for Limits of a Unified Inch InternalThread$ \large D_{1min}=D $$ \large D_{1max}=D_{1min}+T_{D1} $$ \large D_{2minx} = D_2 $$ \large D_{2max}=D_{2min}+ T_{D2} $Related Glossary Terms:PitchThread Allowance (es)Major DiameterTooth per inch (tpi)Lead (Threading)Minor DiameterPitch DiameterFundamental TriangleThread Height (Depth)Thread addendumTap Drill SizeMaximum material condition (MMC)Length of Engagement

Table of ContentsList of ChartsOverviewDesignationPossible Combinations (Diameter/Pitch)Basic Thread Dimensions (UNC, UNF & UNEF)SymbolsFormulasDimensions Chartslimits of Thread Dimensions (UNC, UNF & UNEF)ClassesAllowanceTolerancesLimits Calculations

Formulas for Internal Thread(Classes 1B,2B & 3B)$ \large T_{d1(1B)} = 0.25 \times P\,-\,0.4 \times P^{2} $$ \large T_{d2(1B)} = 1.95 \times T $$ \large T_{d1(2B)} = 0.25 \times P\,-\,0.4 \times P^{2} $$ \large T_{d2(2B)} = 1.30 \times T $$\begin{array}{ll} \large T_{d1(3B)}=&0.05 \times \sqrt[3]{P} + &\\ &0.003 \times \frac{P}{D}\,-\,0.002 \end{array} $$ \large T_{d2(3B)} = 0.975 \times T $

Product Specification ; Outside Diameter. 1in. ; Thickness. 3/8mm ; Thread Direction. Right Hand ; Thread Size. M10 x 1.25.

To manufacture or measure a thread, one has to know the maximum and minimum permissible values of the basic dimensions. These values are calculated according to the thread class (See below). To understand classes, you first need to understand the terms Allowance (Sometimes referred to as deviation) and Tolerances.Definition of terms:Allowance (Deviation): The minimum permissible distance between the basic and actual profile.Tolerance: The width of the tolerance field of a diameter on the actual thread profile. (Pitch, Major & Minor diameters)A small allowance means that the assembly of a male and female thread will be harder, but after assembly, there will be less freedom of movement.A large allowance means that the assembly of a male and female thread will be easier, but after assembly, there will be more freedom of movement.The allowance size does not influence a thread’s production difficulty or price.A wide tolerance is easier and cheaper to produce but yields a larger spread between threads.A narrow tolerance is challenging to produce and more expensive but yields a smaller spread between threads.Unified Thread ClassesThe class is defined by a two-character code.The first character defines is a digit between 1 and 3. 1=Loose fit, 2=Medium fit, and 3=Tight fit.The second character is a letter. A=External thread and B=Internal thread.In the Unified Inch thread system, only classes 1A & 2A have an allowance. The allowance for the two classes is the same.The other 4 classes have an allowance of Zero.All the internal thread profiles (B classes) have no allowance.Classes 1A & 1B: These classes are suitable for applications where a liberal tolerance and allowance are required to permit easy assembly. The maximum diameters of Class 1A threads are smaller than the basic diameter by the allowance amount. The minimum diameters of Class 1B threads are equal to the basic diameters and consequently afford no allowance at maximum material condition.Classes 2A & 2B: Classes 2A (external) and 2B (internal) are the default classes used for the commercial production of Nut, Bols, and otehr threaded fasteners. They are the default class unless otherwise specified. they have the same allowance as classes 1A/1B. However, they have a narrower tolerance field. The difficulty of assembly is the same, but the spread between different parts in a production batch is smaller.Classes 3A & 3B: These classes are suitable for applications where tight fit and accuracy of thread elements are essential. The maximum diameters of Class 3A threads and the minimum diameters of Class 3B threads are the same (Both have zero allowance). The accuracy is high, but the assembly is difficult.Combinations of Classes: The engineer can select any valid class for the male and female threads to achieve his design goals. The valid classes are defined in ASTM B1.1 as follows:Classes 2A, 2A, 3B, and 3B are always valid.Classes 1A & 1B are valid only for UNC threads with a nominal diameter equal to or larger than 1/4″.Unified Thread Allowance.The allowance es should be calculated for external threads with classes 1A and 2A. The allowance of both classes is the same and equals 0.3 times the pitch diameter tolerance of class 2A. It is the function of 3 parameters.D – Basic (nominal diameter)P – Pitch (1/TPI)LE – Length of engagement. If not explicitly specified, the length of engagement is assumed to be 5 pitches. (LE=5*P)All parameters are in inches$ \large es = 0.3 \times \left [ 0.0015 \times \sqrt[3]{D} + 0.0015 \times \sqrt{LE} + 0.015 \times \sqrt[3]{P^{2}} \right ] $\begin{array} \large \,es& = 0.3 \times\,[\,0.0015 \times \sqrt[3]{D} &\\ & +\,0.0015 \times \sqrt{LE}&\\ & + 0.015 \times \sqrt[3]{P^{2}}\,] \end{array}The result should be rounded to 6 decimal places.ASTM B1.1 lists in a long chart the allowance for each thread size. However, the results of this formula are 100% accurate, and there is no need to browse the chart.You can use our Advanced Threading Calculator to obtain the allowance according to a thread description or use the mini-calculator below.Unified Thread Allowance CalculatorPayment options Unified Thread TolerancesThe tolerances TD for internal threads and Td for external threads are derived from the class. The tolerances can be calculated according to the below formulas.Td – Tolerance for External Major DiameterTd2 – Tolerance for External Pitch DiameterTD1 – Tolerance for Internal Minor DiameterTD2 – Tolerance for Internal Pitch DiameterT – Base Tolerance (The tolerance of CLASS 2A pitch diameter is the base tolerance from which other tolerances are derived)D – Basic thread diameter.P – Pitch (1/TPI).LE – Length of engagement. (If unknown, the default is 5 * P)All input parameters and results are in Inches.Base Tolerance Formula$ \large T = 0.0015 \times \sqrt[3]{D} + 0.0015 \times \sqrt{LE} + 0.015 \times \sqrt[3]{P^{2}}$\begin{array} \large \,T& = \,0.0015 \times \sqrt[3]{D} &\\ & +\,0.0015 \times \sqrt{LE}&\\ & + 0.015 \times \sqrt[3]{P^{2}} \end{array}Formulas for External thread(Classes 1A,2A & 3A)$ \large T_{d(1A)} = 0.3 \times T $$ \large T_{d2(1A)} = 1.5 \times T $$ \large T_{d(2A)} = 0.06 \times \sqrt[3]{P^2} $$ \large T_{d2(2A)} = T $$ \large T_{d(3A)} = 0.06 \times \sqrt[3]{P^2} $$ \large T_{d2(3A)} = 0.75 \times T $Formulas for Internal Thread(Classes 1B,2B & 3B)$ \large T_{d1(1B)} = 0.25 \times P\,-\,0.4 \times P^{2} $$ \large T_{d2(1B)} = 1.95 \times T $$ \large T_{d1(2B)} = 0.25 \times P\,-\,0.4 \times P^{2} $$ \large T_{d2(2B)} = 1.30 \times T $$\begin{array}{ll} \large T_{d1(3B)}=&0.05 \times \sqrt[3]{P} + &\\ &0.003 \times \frac{P}{D}\,-\,0.002 \end{array} $$ \large T_{d2(3B)} = 0.975 \times T $The above formulas can be used in most cases. However, ASTM B1.1 lists various scenarios where other formulas or quirky rounding rules apply. Use our Advanced Threading Calculator to get exact results for any thread.Usage notes for the above formulas:The result should be rounded to 6 decimal places.Formulas for external threads are valid for all threads.Formulas for internal threads are valid only for thread diameters above 1/4″, a pitch between 4 and 80 TPI, and engagement lengths up to 1.5 X D.In some cases, ASTM B1.1 dictates special rounding rules.You can use the Threading Calculator, which automatically considers all the above rules.Unified Thread limits CalculationsOnce the Td, TD, & es values are known, the final limits can be calculated according to the formulas below.Formulas for Limits of a Unified Inch External Thread$ \large d_{max}=d-{es} $$ \large d_{min}=d_{max}-T_d $$ \large d_{2max} = d2 – es $$ \large d_{2min}=d_{2max}-T_{d2} $Formulas for Limits of a Unified Inch InternalThread$ \large D_{1min}=D $$ \large D_{1max}=D_{1min}+T_{D1} $$ \large D_{2minx} = D_2 $$ \large D_{2max}=D_{2min}+ T_{D2} $Related Glossary Terms:PitchThread Allowance (es)Major DiameterTooth per inch (tpi)Lead (Threading)Minor DiameterPitch DiameterFundamental TriangleThread Height (Depth)Thread addendumTap Drill SizeMaximum material condition (MMC)Length of Engagement

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Click the Thread Link to get the Full Thread Data for all classesAll dimensions are in inches. To view the Metric translation, click the Thread LinkClick icon to show Additional columnsClick icon to show Full Thread DataThreadBasic DiamTPIPitchPitch DiamThread HeightCres/ RootTap Drill SizeLead AngleMinor DiameterThread addendumseriesid#0 - 80 UNF0.06800.01250.05190.00680.00310.04864.39°0.04510.0041Metric Values ➢Classes & Tolerances ➢UNF1#1 - 72 UNF0.073720.01390.0640.00750.00350.06043.95°0.05650.0045Metric Values ➢Classes & Tolerances ➢UNF3#2 - 64 UNF0.086640.01560.07590.00850.00390.07183.75°0.06740.0051Metric Values ➢Classes & Tolerances ➢UNF5#3 - 56 UNF0.099560.01790.08740.00970.00450.08283.72°0.07770.0058Metric Values ➢Classes & Tolerances ➢UNF7#4 - 48 UNF0.112480.02080.09850.01130.00520.0933.85°0.08720.0068Metric Values ➢Classes & Tolerances ➢UNF9#5 - 44 UNF0.125440.02270.11020.01230.00570.10433.75°0.09790.0074Metric Values ➢Classes & Tolerances ➢UNF11#6 - 40 UNF0.138400.02500.12180.01350.00630.11533.74°0.10820.0081Metric Values ➢Classes & Tolerances ➢UNF13#8 - 36 UNF0.164360.02780.1460.0150.00690.13873.47°0.13090.009Metric Values ➢Classes & Tolerances ➢UNF16#10 - 32 UNF0.19320.03130.16970.01690.00780.16163.35°0.15280.0101Metric Values ➢Classes & Tolerances ➢UNF19#12 - 28 UNF0.216280.03570.19280.01930.00890.18353.37°0.17350.0116Metric Values ➢Classes & Tolerances ➢UNF221/4 - 28 UNF0.25280.03570.22680.01930.00890.21752.87°0.20750.0116Metric Values ➢Classes & Tolerances ➢UNF275/16 - 24 UNF0.312240.04170.28490.02260.01040.27412.67°0.26240.0135Metric Values ➢Classes & Tolerances ➢UNF333/8 - 24 UNF0.375240.04170.34790.02260.01040.33712.18°0.32540.0135Metric Values ➢Classes & Tolerances ➢UNF397/16 - 20 UNF0.437200.05000.40450.02710.01250.39152.25°0.37750.0162Metric Values ➢Classes & Tolerances ➢UNF461/2 - 20 UNF0.5200.05000.46750.02710.01250.45451.95°0.44050.0162Metric Values ➢Classes & Tolerances ➢UNF539/16 - 18 UNF0.562180.05560.52590.03010.01390.51141.93°0.49580.018Metric Values ➢Classes & Tolerances ➢UNF605/8 - 18 UNF0.625180.05560.58890.03010.01390.57441.72°0.55880.018Metric Values ➢Classes & Tolerances ➢UNF683/4 - 16 UNF0.75160.06250.70940.03380.01560.69311.61°0.67560.0203Metric Values ➢Classes & Tolerances ➢UNF827/8 - 14 UNF0.875140.07140.82860.03870.01790.811.57°0.78990.0232Metric Values ➢Classes & Tolerances ➢UNF961 - 12 UNF1120.08330.94590.04510.02080.92421.61°0.90080.0271Metric Values ➢Classes & Tolerances ➢UNF1101 1/8 - 12 UNF1.125120.08331.07090.04510.02081.04921.42°1.02580.0271Metric Values ➢Classes & Tolerances ➢UNF1251 1/4 - 12 UNF1.25120.08331.19590.04510.02081.17421.27°1.15080.0271Metric Values ➢Classes & Tolerances ➢UNF1391 3/8 - 12 UNF1.375120.08331.32090.04510.02081.29921.15°1.27580.0271Metric Values ➢Classes & Tolerances ➢UNF1531 1/2 - 12 UNF1.5120.08331.44590.04510.02081.42421.05°1.40080.0271Metric Values ➢Classes & Tolerances ➢UNF169UNEF Series Basic Dimensions chartClick the Thread Link to get the Full Thread Data for all classesAll dimensions are in inches. To view the Metric translation, click the Thread LinkClick icon to show Additional columnsClick icon to show Full Thread DataThreadBasic DiamTPIPitchPitch DiamThread HeightCres/ RootTap Drill SizeLead AngleMinor DiameterThread addendumseriesid#12 - 32 UNEF0.216320.03130.19570.01690.00780.18762.91°0.17880.0101Metric Values ➢Classes & Tolerances ➢UNEF231/4 - 32 UNEF0.25320.03130.22970.01690.00780.22162.48°0.21280.0101Metric Values ➢Classes & Tolerances ➢UNEF285/16 - 32 UNEF0.312320.03130.29170.01690.00780.28361.95°0.27480.0101Metric Values ➢Classes & Tolerances ➢UNEF343/8 - 32 UNEF0.375320.03130.35470.01690.00780.34661.61°0.33780.0101Metric Values ➢Classes & Tolerances ➢UNEF407/16 - 28 UNEF0.437280.03570.41380.01930.00890.40451.57°0.39450.0116Metric Values ➢Classes & Tolerances ➢UNEF471/2 - 28 UNEF0.5280.03570.47680.01930.00890.46751.37°0.45750.0116Metric Values ➢Classes & Tolerances ➢UNEF549/16 - 24 UNEF0.562240.04170.53490.02260.01040.52411.42°0.51240.0135Metric Values ➢Classes & Tolerances ➢UNEF615/8 - 24 UNEF0.625240.04170.59790.02260.01040.58711.27°0.57540.0135Metric Values ➢Classes & Tolerances ➢UNEF6911/16 - 24 UNEF0.687240.04170.65990.02260.01040.64911.15°0.63740.0135Metric Values ➢Classes & Tolerances ➢UNEF753/4 - 20 UNEF0.75200.05000.71750.02710.01250.70451.27°0.69050.0162Metric Values ➢Classes & Tolerances ➢UNEF8313/16 - 20 UNEF0.812200.05000.77950.02710.01250.76651.17°0.75250.0162Metric Values ➢Classes & Tolerances ➢UNEF897/8 - 20 UNEF0.875200.05000.84250.02710.01250.82951.08°0.81550.0162Metric Values ➢Classes & Tolerances ➢UNEF9715/16 - 20 UNEF0.937200.05000.90450.02710.01250.89151.01°0.87750.0162Metric Values ➢Classes & Tolerances ➢UNEF1031 - 20 UNEF1200.05000.96750.02710.01250.95450.94°0.94050.0162Metric Values ➢Classes & Tolerances ➢UNEF1111 1/16 - 18 UNEF1.062180.05561.02590.03010.01391.01140.99°0.99580.018Metric Values ➢Classes & Tolerances ➢UNEF1181 1/8 - 18 UNEF1.125180.05561.08890.03010.01391.07440.93°1.05880.018Metric Values ➢Classes & Tolerances ➢UNEF1261 3/16 - 18 UNEF1.187180.05561.15090.03010.01391.13640.88°1.12080.018Metric Values ➢Classes & Tolerances ➢UNEF1321 1/4 - 18 UNEF1.25180.05561.21390.03010.01391.19940.83°1.18380.018Metric Values ➢Classes & Tolerances ➢UNEF1401 5/16 - 18 UNEF1.312180.05561.27590.03010.01391.26140.79°1.24580.018Metric Values ➢Classes & Tolerances ➢UNEF1461 3/8 - 18 UNEF1.375180.05561.33890.03010.01391.32440.76°1.30880.018Metric Values ➢Classes & Tolerances ➢UNEF1541 7/16 - 18 UNEF1.437180.05561.40090.03010.01391.38640.72°1.37080.018Metric Values ➢Classes & Tolerances ➢UNEF1611 1/2 - 18 UNEF1.5180.05561.46390.03010.01391.44940.69°1.43380.018Metric Values ➢Classes & Tolerances ➢UNEF1701 9/16 - 18 UNEF1.562180.05561.52590.03010.01391.51140.66°1.49580.018Metric Values ➢Classes & Tolerances ➢UNEF1771 5/8 - 18 UNEF1.625180.05561.58890.03010.01391.57440.64°1.55880.018Metric Values ➢Classes & Tolerances ➢UNEF1831 11/16 - 18 UNEF1.687180.05561.65090.03010.01391.63640.61°1.62080.018Metric Values ➢Classes & Tolerances ➢UNEF189UN Constant Pitch Series Basic Dimensions chartClick the Thread Link to get the Full Thread Data for all classesAll dimensions are in inches. To view the Metric translation, click the Thread LinkClick icon to show Additional columnsClick icon to show Full Thread DataThreadBasic DiamTPIPitchPitch DiamThread HeightCres/ RootTap Drill SizeLead AngleMinor DiameterThread addendumseriesid9/16 - 12 12-UN0.562120.08330.50790.04510.02080.48622.99°0.46280.0271Metric Values ➢Classes & Tolerances ➢12-UN625/8 - 12 12-UN0.625120.08330.57090.04510.02080.54922.66°0.52580.0271Metric Values ➢Classes & Tolerances ➢12-UN7011/16 - 12 12-UN0.687120.08330.63290.04510.02080.61122.4°0.58780.0271Metric Values ➢Classes & Tolerances ➢12-UN763/4 - 12 12-UN0.75120.08330.69590.04510.02080.67422.18°0.65080.0271Metric Values ➢Classes & Tolerances ➢12-UN8413/16 - 12 12-UN0.812120.08330.75790.04510.02080.73622°0.71280.0271Metric Values ➢Classes & Tolerances ➢12-UN907/8 - 12 12-UN0.875120.08330.82090.04510.02080.79921.85°0.77580.0271Metric Values ➢Classes & Tolerances ➢12-UN9815/16 - 12 12-UN0.937120.08330.88290.04510.02080.86121.72°0.83780.0271Metric Values ➢Classes & Tolerances ➢12-UN1041 - 12 12-UN1120.08330.94590.04510.02080.92421.61°0.90080.0271Metric Values ➢Classes & Tolerances ➢12-UN1131 1/16 - 12 12-UN1.062120.08331.00790.04510.02080.98621.51°0.96280.0271Metric Values ➢Classes & Tolerances ➢12-UN1201 1/8 - 12 12-UN1.125120.08331.07090.04510.02081.04921.42°1.02580.0271Metric Values ➢Classes & Tolerances ➢12-UN1281 3/16 - 12 12-UN1.187120.08331.13290.04510.02081.11121.34°1.08780.0271Metric Values ➢Classes & Tolerances ➢12-UN1341 1/4 - 12 12-UN1.25120.08331.19590.04510.02081.17421.27°1.15080.0271Metric Values ➢Classes & Tolerances ➢12-UN1421 5/16 - 12 12-UN1.312120.08331.25790.04510.02081.23621.21°1.21280.0271Metric Values ➢Classes & Tolerances ➢12-UN1481 3/8 - 12 12-UN1.375120.08331.32090.04510.02081.29921.15°1.27580.0271Metric Values ➢Classes & Tolerances ➢12-UN1571 7/16 - 12 12-UN1.437120.08331.38290.04510.02081.36121.1°1.33780.0271Metric Values ➢Classes & Tolerances ➢12-UN1641 1/2 - 12 12-UN1.5120.08331.44590.04510.02081.42421.05°1.40080.0271Metric Values ➢Classes & Tolerances ➢12-UN1731 9/16 - 12 12-UN1.562120.08331.50790.04510.02081.48621.01°1.46280.0271Metric Values ➢Classes & Tolerances ➢12-UN1801 5/8 - 12 12-UN1.625120.08331.57090.04510.02081.54920.97°1.52580.0271Metric Values ➢Classes & Tolerances ➢12-UN1861 11/16 - 12 12-UN1.687120.08331.63290.04510.02081.61120.93°1.58780.0271Metric Values ➢Classes & Tolerances ➢12-UN1921 3/4 - 12 12-UN1.75120.08331.69590.04510.02081.67420.9°1.65080.0271Metric Values ➢Classes & Tolerances ➢12-UN1981 13/16 - 12 12-UN1.812120.08331.75790.04510.02081.73620.86°1.71280.0271Metric Values ➢Classes & Tolerances ➢12-UN2031 7/8 - 12 12-UN1.875120.08331.82090.04510.02081.79920.83°1.77580.0271Metric Values ➢Classes & Tolerances ➢12-UN2081 15/16 - 12 12-UN1.937120.08331.88290.04510.02081.86120.81°1.83780.0271Metric Values ➢Classes & Tolerances ➢12-UN2132 - 12 12-UN2120.08331.94590.04510.02081.92420.78°1.90080.0271Metric Values ➢Classes & Tolerances ➢12-UN2192 1/8 - 12 12-UN2.125120.08332.07090.04510.02082.04920.73°2.02580.0271Metric Values ➢Classes & Tolerances ➢12-UN2242 1/4 - 12 12-UN2.25120.08332.19590.04510.02082.17420.69°2.15080.0271Metric Values ➢Classes & Tolerances ➢12-UN2302 3/8 - 12 12-UN2.375120.08332.32090.04510.02082.29920.65°2.27580.0271Metric Values ➢Classes & Tolerances ➢12-UN2352 1/2 - 12 12-UN2.5120.08332.44590.04510.02082.42420.62°2.40080.0271Metric Values ➢Classes & Tolerances ➢12-UN2422 5/8 - 12 12-UN2.625120.08332.57090.04510.02082.54920.59°2.52580.0271Metric Values ➢Classes & Tolerances ➢12-UN2482 3/4 - 12 12-UN2.75120.08332.69590.04510.02082.67420.56°2.65080.0271Metric Values ➢Classes & Tolerances ➢12-UN2552 7/8 - 12 12-UN2.875120.08332.82090.04510.02082.79920.54°2.77580.0271Metric Values ➢Classes & Tolerances ➢12-UN2613 - 12 12-UN3120.08332.94590.04510.02082.92420.52°2.90080.0271Metric Values ➢Classes & Tolerances ➢12-UN2683 1/8 - 12 12-UN3.125120.08333.07090.04510.02083.04920.49°3.02580.0271Metric Values ➢Classes & Tolerances ➢12-UN2743 1/4 - 12 12-UN3.25120.08333.19590.04510.02083.17420.48°3.15080.0271Metric Values ➢Classes & Tolerances ➢12-UN2803 3/8 - 12 12-UN3.375120.08333.32090.04510.02083.29920.46°3.27580.0271Metric Values ➢Classes & Tolerances ➢12-UN2853 1/2 - 12 12-UN3.5120.08333.44590.04510.02083.42420.44°3.40080.0271Metric Values ➢Classes & Tolerances ➢12-UN2913 5/8 - 12 12-UN3.625120.08333.57090.04510.02083.54920.43°3.52580.0271Metric Values ➢Classes & Tolerances ➢12-UN2963 3/4 - 12 12-UN3.75120.08333.69590.04510.02083.67420.41°3.65080.0271Metric Values ➢Classes & Tolerances ➢12-UN3023 7/8 - 12 12-UN3.875120.08333.82090.04510.02083.79920.4°3.77580.0271Metric Values ➢Classes & Tolerances ➢12-UN3074 - 12 12-UN4120.08333.94590.04510.02083.92420.39°3.90080.0271Metric Values ➢Classes & Tolerances ➢12-UN3134 1/8 - 12 12-UN4.125120.08334.07090.04510.02084.04920.37°4.02580.0271Metric Values ➢Classes & Tolerances ➢12-UN3184 1/4 - 12 12-UN4.25120.08334.19590.04510.02084.17420.36°4.15080.0271Metric Values ➢Classes & Tolerances ➢12-UN3234 3/8 - 12 12-UN4.375120.08334.32090.04510.02084.29920.35°4.27580.0271Metric Values ➢Classes & Tolerances ➢12-UN3284 1/2 - 12 12-UN4.5120.08334.44590.04510.02084.42420.34°4.40080.0271Metric Values ➢Classes & Tolerances ➢12-UN3334 5/8 - 12 12-UN4.625120.08334.57090.04510.02084.54920.33°4.52580.0271Metric Values ➢Classes & Tolerances ➢12-UN3384 3/4 - 12 12-UN4.75120.08334.69590.04510.02084.67420.32°4.65080.0271Metric Values ➢Classes & Tolerances ➢12-UN3444 7/8 - 12 12-UN4.875120.08334.82090.04510.02084.79920.32°4.77580.0271Metric Values ➢Classes & Tolerances ➢12-UN3495 - 12 12-UN5120.08334.94590.04510.02084.92420.31°4.90080.0271Metric Values ➢Classes & Tolerances ➢12-UN3545 1/8 - 12 12-UN5.125120.08335.07090.04510.02085.04920.3°5.02580.0271Metric Values ➢Classes & Tolerances ➢12-UN3595 1/4 - 12 12-UN5.25120.08335.19590.04510.02085.17420.29°5.15080.0271Metric Values ➢Classes & Tolerances ➢12-UN3645 3/8 - 12 12-UN5.375120.08335.32090.04510.02085.29920.29°5.27580.0271Metric Values ➢Classes & Tolerances ➢12-UN3695 1/2 - 12 12-UN5.5120.08335.44590.04510.02085.42420.28°5.40080.0271Metric Values ➢Classes & Tolerances ➢12-UN3745 5/8 - 12 12-UN5.625120.08335.57090.04510.02085.54920.27°5.52580.0271Metric Values ➢Classes & Tolerances ➢12-UN3795 3/4 - 12 12-UN5.75120.08335.69590.04510.02085.67420.27°5.65080.0271Metric Values ➢Classes & Tolerances ➢12-UN3845 7/8 - 12 12-UN5.875120.08335.82090.04510.02085.79920.26°5.77580.0271Metric Values ➢Classes & Tolerances ➢12-UN3896 - 12 12-UN6120.08335.94590.04510.02085.92420.26°5.90080.0271Metric Values ➢Classes & Tolerances ➢12-UN3943/8 - 16 16-UN0.375160.06250.33440.03380.01560.31813.4°0.30060.0203Metric Values ➢Classes & Tolerances ➢16-UN417/16 - 16 16-UN0.437160.06250.39640.03380.01560.38012.87°0.36260.0203Metric Values ➢Classes & Tolerances ➢16-UN481/2 - 16 16-UN0.5160.06250.45940.03380.01560.44312.48°0.42560.0203Metric Values ➢Classes & Tolerances ➢16-UN559/16 - 16 16-UN0.562160.06250.52140.03380.01560.50512.19°0.48760.0203Metric Values ➢Classes & Tolerances ➢16-UN635/8 - 16 16-UN0.625160.06250.58440.03380.01560.56811.95°0.55060.0203Metric Values ➢Classes & Tolerances ➢16-UN7111/16 - 16 16-UN0.687160.06250.64640.03380.01560.63011.76°0.61260.0203Metric Values ➢Classes & Tolerances ➢16-UN773/4 - 16 16-UN0.75160.06250.70940.03380.01560.69311.61°0.67560.0203Metric Values ➢Classes & Tolerances ➢16-UN8513/16 - 16 16-UN0.812160.06250.77140.03380.01560.75511.48°0.73760.0203Metric Values ➢Classes & Tolerances ➢16-UN917/8 - 16 16-UN0.875160.06250.83440.03380.01560.81811.37°0.80060.0203Metric Values ➢Classes & Tolerances ➢16-UN9915/16 - 16 16-UN0.937160.06250.89640.03380.01560.88011.27°0.86260.0203Metric Values ➢Classes & Tolerances ➢16-UN1051 - 16 16-UN1160.06250.95940.03380.01560.94311.19°0.92560.0203Metric Values ➢Classes & Tolerances ➢16-UN1141 1/16 - 16 16-UN1.062160.06251.02140.03380.01561.00511.12°0.98760.0203Metric Values ➢Classes & Tolerances ➢16-UN1211 1/8 - 16 16-UN1.125160.06251.08440.03380.01561.06811.05°1.05060.0203Metric Values ➢Classes & Tolerances ➢16-UN1291 3/16 - 16 16-UN1.187160.06251.14640.03380.01561.13010.99°1.11260.0203Metric Values ➢Classes & Tolerances ➢16-UN1351 1/4 - 16 16-UN1.25160.06251.20940.03380.01561.19310.94°1.17560.0203Metric Values ➢Classes & Tolerances ➢16-UN1431 5/16 - 16 16-UN1.312160.06251.27140.03380.01561.25510.9°1.23760.0203Metric Values ➢Classes & Tolerances ➢16-UN1491 3/8 - 16 16-UN1.375160.06251.33440.03380.01561.31810.85°1.30060.0203Metric Values ➢Classes & Tolerances ➢16-UN1581 7/16 - 16 16-UN1.437160.06251.39640.03380.01561.38010.82°1.36260.0203Metric Values ➢Classes & Tolerances ➢16-UN1651 1/2 - 16 16-UN1.5160.06251.45940.03380.01561.44310.78°1.42560.0203Metric Values ➢Classes & Tolerances ➢16-UN1741 9/16 - 16 16-UN1.562160.06251.52140.03380.01561.50510.75°1.48760.0203Metric Values ➢Classes & Tolerances ➢16-UN1811 5/8 - 16 16-UN1.625160.06251.58440.03380.01561.56810.72°1.55060.0203Metric Values ➢Classes & Tolerances ➢16-UN1871 11/16 - 16 16-UN1.687160.06251.64640.03380.01561.63010.69°1.61260.0203Metric Values ➢Classes & Tolerances ➢16-UN1931 3/4 - 16 16-UN1.75160.06251.70940.03380.01561.69310.67°1.67560.0203Metric Values ➢Classes & Tolerances ➢16-UN1991 13/16 - 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4 4-UN4.37540.25004.21260.13530.06254.14751.08°4.07730.0812Metric Values ➢Classes & Tolerances ➢4-UN3254 1/2 - 4 4-UN4.540.25004.33760.13530.06254.27251.05°4.20230.0812Metric Values ➢Classes & Tolerances ➢4-UN3304 5/8 - 4 4-UN4.62540.25004.46260.13530.06254.39751.02°4.32730.0812Metric Values ➢Classes & Tolerances ➢4-UN3354 3/4 - 4 4-UN4.7540.25004.58760.13530.06254.52250.99°4.45230.0812Metric Values ➢Classes & Tolerances ➢4-UN3414 7/8 - 4 4-UN4.87540.25004.71260.13530.06254.64750.97°4.57730.0812Metric Values ➢Classes & Tolerances ➢4-UN3465 - 4 4-UN540.25004.83760.13530.06254.77250.94°4.70230.0812Metric Values ➢Classes & Tolerances ➢4-UN3515 1/8 - 4 4-UN5.12540.25004.96260.13530.06254.89750.92°4.82730.0812Metric Values ➢Classes & Tolerances ➢4-UN3565 1/4 - 4 4-UN5.2540.25005.08760.13530.06255.02250.9°4.95230.0812Metric Values ➢Classes & Tolerances ➢4-UN3615 3/8 - 4 4-UN5.37540.25005.21260.13530.06255.14750.87°5.07730.0812Metric Values ➢Classes & Tolerances ➢4-UN3665 1/2 - 4 4-UN5.540.25005.33760.13530.06255.27250.85°5.20230.0812Metric Values ➢Classes & Tolerances ➢4-UN3715 5/8 - 4 4-UN5.62540.25005.46260.13530.06255.39750.83°5.32730.0812Metric Values ➢Classes & Tolerances ➢4-UN3765 3/4 - 4 4-UN5.7540.25005.58760.13530.06255.52250.82°5.45230.0812Metric Values ➢Classes & Tolerances ➢4-UN3815 7/8 - 4 4-UN5.87540.25005.71260.13530.06255.64750.8°5.57730.0812Metric Values ➢Classes & Tolerances ➢4-UN3866 - 4 4-UN640.25005.83760.13530.06255.77250.78°5.70230.0812Metric Values ➢Classes & Tolerances ➢4-UN3911 3/8 - 6 6-UN1.37560.16671.26670.09020.04171.22332.4°1.17650.0541Metric Values ➢Classes & Tolerances ➢6-UN1551 7/16 - 6 6-UN1.43760.16671.32870.09020.04171.28532.29°1.23850.0541Metric Values ➢Classes & Tolerances ➢6-UN1621 1/2 - 6 6-UN1.560.16671.39170.09020.04171.34832.18°1.30150.0541Metric Values ➢Classes & Tolerances ➢6-UN1711 9/16 - 6 6-UN1.56260.16671.45370.09020.04171.41032.09°1.36350.0541Metric Values ➢Classes & Tolerances ➢6-UN1781 5/8 - 6 6-UN1.62560.16671.51670.09020.04171.47332°1.42650.0541Metric Values ➢Classes & Tolerances ➢6-UN1841 11/16 - 6 6-UN1.68760.16671.57870.09020.04171.53531.92°1.48850.0541Metric Values ➢Classes & Tolerances ➢6-UN1901 3/4 - 6 6-UN1.7560.16671.64170.09020.04171.59831.85°1.55150.0541Metric Values ➢Classes & Tolerances ➢6-UN1961 13/16 - 6 6-UN1.81260.16671.70370.09020.04171.66031.78°1.61350.0541Metric Values ➢Classes & Tolerances ➢6-UN2011 7/8 - 6 6-UN1.87560.16671.76670.09020.04171.72331.72°1.67650.0541Metric Values ➢Classes & Tolerances ➢6-UN2061 15/16 - 6 6-UN1.93760.16671.82870.09020.04171.78531.66°1.73850.0541Metric Values ➢Classes & Tolerances ➢6-UN2112 - 6 6-UN260.16671.89170.09020.04171.84831.61°1.80150.0541Metric Values ➢Classes & Tolerances ➢6-UN2172 1/8 - 6 6-UN2.12560.16672.01670.09020.04171.97331.51°1.92650.0541Metric Values ➢Classes & Tolerances ➢6-UN2222 1/4 - 6 6-UN2.2560.16672.14170.09020.04172.09831.42°2.05150.0541Metric Values ➢Classes & Tolerances ➢6-UN2282 3/8 - 6 6-UN2.37560.16672.26670.09020.04172.22331.34°2.17650.0541Metric Values ➢Classes & Tolerances ➢6-UN2332 1/2 - 6 6-UN2.560.16672.39170.09020.04172.34831.27°2.30150.0541Metric Values ➢Classes & Tolerances ➢6-UN2402 5/8 - 6 6-UN2.62560.16672.51670.09020.04172.47331.21°2.42650.0541Metric Values ➢Classes & Tolerances ➢6-UN2462 3/4 - 6 6-UN2.7560.16672.64170.09020.04172.59831.15°2.55150.0541Metric Values ➢Classes & Tolerances ➢6-UN2532 7/8 - 6 6-UN2.87560.16672.76670.09020.04172.72331.1°2.67650.0541Metric Values ➢Classes & Tolerances ➢6-UN2593 - 6 6-UN360.16672.89170.09020.04172.84831.05°2.80150.0541Metric Values ➢Classes & Tolerances ➢6-UN2663 1/8 - 6 6-UN3.12560.16673.01670.09020.04172.97331.01°2.92650.0541Metric Values ➢Classes & Tolerances ➢6-UN2723 1/4 - 6 6-UN3.2560.16673.14170.09020.04173.09830.97°3.05150.0541Metric Values ➢Classes & Tolerances ➢6-UN2783 3/8 - 6 6-UN3.37560.16673.26670.09020.04173.22330.93°3.17650.0541Metric Values ➢Classes & Tolerances ➢6-UN2833 1/2 - 6 6-UN3.560.16673.39170.09020.04173.34830.9°3.30150.0541Metric Values ➢Classes & Tolerances ➢6-UN2893 5/8 - 6 6-UN3.62560.16673.51670.09020.04173.47330.86°3.42650.0541Metric Values ➢Classes & Tolerances ➢6-UN2943 3/4 - 6 6-UN3.7560.16673.64170.09020.04173.59830.83°3.55150.0541Metric Values ➢Classes & Tolerances ➢6-UN3003 7/8 - 6 6-UN3.87560.16673.76670.09020.04173.72330.81°3.67650.0541Metric Values ➢Classes & Tolerances ➢6-UN3054 - 6 6-UN460.16673.89170.09020.04173.84830.78°3.80150.0541Metric Values ➢Classes & Tolerances ➢6-UN3114 1/8 - 6 6-UN4.12560.16674.01670.09020.04173.97330.76°3.92650.0541Metric Values ➢Classes & Tolerances ➢6-UN3164 1/4 - 6 6-UN4.2560.16674.14170.09020.04174.09830.73°4.05150.0541Metric Values ➢Classes & Tolerances ➢6-UN3214 3/8 - 6 6-UN4.37560.16674.26670.09020.04174.22330.71°4.17650.0541Metric Values ➢Classes & Tolerances ➢6-UN3264 1/2 - 6 6-UN4.560.16674.39170.09020.04174.34830.69°4.30150.0541Metric Values ➢Classes & Tolerances ➢6-UN3314 5/8 - 6 6-UN4.62560.16674.51670.09020.04174.47330.67°4.42650.0541Metric Values ➢Classes & Tolerances ➢6-UN3364 3/4 - 6 6-UN4.7560.16674.64170.09020.04174.59830.65°4.55150.0541Metric Values ➢Classes & Tolerances ➢6-UN3424 7/8 - 6 6-UN4.87560.16674.76670.09020.04174.72330.64°4.67650.0541Metric Values ➢Classes & Tolerances ➢6-UN3475 - 6 6-UN560.16674.89170.09020.04174.84830.62°4.80150.0541Metric Values ➢Classes & Tolerances ➢6-UN3525 1/8 - 6 6-UN5.12560.16675.01670.09020.04174.97330.61°4.92650.0541Metric Values ➢Classes & Tolerances ➢6-UN3575 1/4 - 6 6-UN5.2560.16675.14170.09020.04175.09830.59°5.05150.0541Metric Values ➢Classes & Tolerances ➢6-UN3625 3/8 - 6 6-UN5.37560.16675.26670.09020.04175.22330.58°5.17650.0541Metric Values ➢Classes & Tolerances ➢6-UN3675 1/2 - 6 6-UN5.560.16675.39170.09020.04175.34830.56°5.30150.0541Metric Values ➢Classes & Tolerances ➢6-UN3725 5/8 - 6 6-UN5.62560.16675.51670.09020.04175.47330.55°5.42650.0541Metric Values ➢Classes & Tolerances ➢6-UN3775 3/4 - 6 6-UN5.7560.16675.64170.09020.04175.59830.54°5.55150.0541Metric Values ➢Classes & Tolerances ➢6-UN3825 7/8 - 6 6-UN5.87560.16675.76670.09020.04175.72330.53°5.67650.0541Metric Values ➢Classes & Tolerances ➢6-UN3876 - 6 6-UN660.16675.89170.09020.04175.84830.52°5.80150.0541Metric Values ➢Classes & Tolerances ➢6-UN3921 - 8 8-UN180.12500.91880.06770.03130.88632.48°0.85120.0406Metric Values ➢Classes & Tolerances ➢8-UN1121 1/16 - 8 8-UN1.06280.12500.98080.06770.03130.94832.32°0.91320.0406Metric Values ➢Classes & Tolerances ➢8-UN1191 1/8 - 8 8-UN1.12580.12501.04380.06770.03131.01132.18°0.97620.0406Metric Values ➢Classes & Tolerances ➢8-UN1271 3/16 - 8 8-UN1.18780.12501.10580.06770.03131.07332.06°1.03820.0406Metric Values ➢Classes & Tolerances ➢8-UN1331 1/4 - 8 8-UN1.2580.12501.16880.06770.03131.13631.95°1.10120.0406Metric Values ➢Classes & Tolerances ➢8-UN1411 5/16 - 8 8-UN1.31280.12501.23080.06770.03131.19831.85°1.16320.0406Metric Values ➢Classes & Tolerances ➢8-UN1471 3/8 - 8 8-UN1.37580.12501.29380.06770.03131.26131.76°1.22620.0406Metric Values ➢Classes & Tolerances ➢8-UN1561 7/16 - 8 8-UN1.43780.12501.35580.06770.03131.32331.68°1.28820.0406Metric Values ➢Classes & Tolerances ➢8-UN1631 1/2 - 8 8-UN1.580.12501.41880.06770.03131.38631.61°1.35120.0406Metric Values ➢Classes & Tolerances ➢8-UN1721 9/16 - 8 8-UN1.56280.12501.48080.06770.03131.44831.54°1.41320.0406Metric Values ➢Classes & Tolerances ➢8-UN1791 5/8 - 8 8-UN1.62580.12501.54380.06770.03131.51131.48°1.47620.0406Metric Values ➢Classes & Tolerances ➢8-UN1851 11/16 - 8 8-UN1.68780.12501.60580.06770.03131.57331.42°1.53820.0406Metric Values ➢Classes & Tolerances ➢8-UN1911 3/4 - 8 8-UN1.7580.12501.66880.06770.03131.63631.37°1.60120.0406Metric Values ➢Classes & Tolerances ➢8-UN1971 13/16 - 8 8-UN1.81280.12501.73080.06770.03131.69831.32°1.66320.0406Metric Values ➢Classes & Tolerances ➢8-UN2021 7/8 - 8 8-UN1.87580.12501.79380.06770.03131.76131.27°1.72620.0406Metric Values ➢Classes & Tolerances ➢8-UN2071 15/16 - 8 8-UN1.93780.12501.85580.06770.03131.82331.23°1.78820.0406Metric Values ➢Classes & Tolerances ➢8-UN2122 - 8 8-UN280.12501.91880.06770.03131.88631.19°1.85120.0406Metric Values ➢Classes & Tolerances ➢8-UN2182 1/8 - 8 8-UN2.12580.12502.04380.06770.03132.01131.12°1.97620.0406Metric Values ➢Classes & Tolerances ➢8-UN2232 1/4 - 8 8-UN2.2580.12502.16880.06770.03132.13631.05°2.10120.0406Metric Values ➢Classes & Tolerances ➢8-UN2292 3/8 - 8 8-UN2.37580.12502.29380.06770.03132.26130.99°2.22620.0406Metric Values ➢Classes & Tolerances ➢8-UN2342 1/2 - 8 8-UN2.580.12502.41880.06770.03132.38630.94°2.35120.0406Metric Values ➢Classes & Tolerances ➢8-UN2412 5/8 - 8 8-UN2.62580.12502.54380.06770.03132.51130.9°2.47620.0406Metric Values ➢Classes & Tolerances ➢8-UN2472 3/4 - 8 8-UN2.7580.12502.66880.06770.03132.63630.85°2.60120.0406Metric Values ➢Classes & Tolerances ➢8-UN2542 7/8 - 8 8-UN2.87580.12502.79380.06770.03132.76130.82°2.72620.0406Metric Values ➢Classes & Tolerances ➢8-UN2603 - 8 8-UN380.12502.91880.06770.03132.88630.78°2.85120.0406Metric Values ➢Classes & Tolerances ➢8-UN2673 1/8 - 8 8-UN3.12580.12503.04380.06770.03133.01130.75°2.97620.0406Metric Values ➢Classes & Tolerances ➢8-UN2733 1/4 - 8 8-UN3.2580.12503.16880.06770.03133.13630.72°3.10120.0406Metric Values ➢Classes & Tolerances ➢8-UN2793 3/8 - 8 8-UN3.37580.12503.29380.06770.03133.26130.69°3.22620.0406Metric Values ➢Classes & Tolerances ➢8-UN2843 1/2 - 8 8-UN3.580.12503.41880.06770.03133.38630.67°3.35120.0406Metric Values ➢Classes & Tolerances ➢8-UN2903 5/8 - 8 8-UN3.62580.12503.54380.06770.03133.51130.64°3.47620.0406Metric Values ➢Classes & Tolerances ➢8-UN2953 3/4 - 8 8-UN3.7580.12503.66880.06770.03133.63630.62°3.60120.0406Metric Values ➢Classes & Tolerances ➢8-UN3013 7/8 - 8 8-UN3.87580.12503.79380.06770.03133.76130.6°3.72620.0406Metric Values ➢Classes & Tolerances ➢8-UN3064 - 8 8-UN480.12503.91880.06770.03133.88630.58°3.85120.0406Metric Values ➢Classes & Tolerances ➢8-UN3124 1/8 - 8 8-UN4.12580.12504.04380.06770.03134.01130.56°3.97620.0406Metric Values ➢Classes & Tolerances ➢8-UN3174 1/4 - 8 8-UN4.2580.12504.16880.06770.03134.13630.55°4.10120.0406Metric Values ➢Classes & Tolerances ➢8-UN3224 3/8 - 8 8-UN4.37580.12504.29380.06770.03134.26130.53°4.22620.0406Metric Values ➢Classes & Tolerances ➢8-UN3274 1/2 - 8 8-UN4.580.12504.41880.06770.03134.38630.52°4.35120.0406Metric Values ➢Classes & Tolerances ➢8-UN3324 5/8 - 8 8-UN4.62580.12504.54380.06770.03134.51130.5°4.47620.0406Metric Values ➢Classes & Tolerances ➢8-UN3374 3/4 - 8 8-UN4.7580.12504.66880.06770.03134.63630.49°4.60120.0406Metric Values ➢Classes & Tolerances ➢8-UN3434 7/8 - 8 8-UN4.87580.12504.79380.06770.03134.76130.48°4.72620.0406Metric Values ➢Classes & Tolerances ➢8-UN3485 - 8 8-UN580.12504.91880.06770.03134.88630.46°4.85120.0406Metric Values ➢Classes & Tolerances ➢8-UN3535 1/8 - 8 8-UN5.12580.12505.04380.06770.03135.01130.45°4.97620.0406Metric Values ➢Classes & Tolerances ➢8-UN3585 1/4 - 8 8-UN5.2580.12505.16880.06770.03135.13630.44°5.10120.0406Metric Values ➢Classes & Tolerances ➢8-UN3635 3/8 - 8 8-UN5.37580.12505.29380.06770.03135.26130.43°5.22620.0406Metric Values ➢Classes & Tolerances ➢8-UN3685 1/2 - 8 8-UN5.580.12505.41880.06770.03135.38630.42°5.35120.0406Metric Values ➢Classes & Tolerances ➢8-UN3735 5/8 - 8 8-UN5.62580.12505.54380.06770.03135.51130.41°5.47620.0406Metric Values ➢Classes & Tolerances ➢8-UN3785 3/4 - 8 8-UN5.7580.12505.66880.06770.03135.63630.4°5.60120.0406Metric Values ➢Classes & Tolerances ➢8-UN3835 7/8 - 8 8-UN5.87580.12505.79380.06770.03135.76130.39°5.72620.0406Metric Values ➢Classes & Tolerances ➢8-UN3886 - 8 8-UN680.12505.91880.06770.03135.88630.39°5.85120.0406Metric Values ➢Classes & Tolerances ➢8-UN393limits of Thread Dimensions (UNC, UNF & UNEF)To manufacture or measure a thread, one has to know the maximum and minimum permissible values of the basic dimensions. These values are calculated according to the thread class (See below). To understand classes, you first need to understand the terms Allowance (Sometimes referred to as deviation) and Tolerances.Definition of terms:Allowance (Deviation): The minimum permissible distance between the basic and actual profile.Tolerance: The width of the tolerance field of a diameter on the actual thread profile. (Pitch, Major & Minor diameters)A small allowance means that the assembly of a male and female thread will be harder, but after assembly, there will be less freedom of movement.A large allowance means that the assembly of a male and female thread will be easier, but after assembly, there will be more freedom of movement.The allowance size does not influence a thread’s production difficulty or price.A wide tolerance is easier and cheaper to produce but yields a larger spread between threads.A narrow tolerance is challenging to produce and more expensive but yields a smaller spread between threads.Unified Thread ClassesThe class is defined by a two-character code.The first character defines is a digit between 1 and 3. 1=Loose fit, 2=Medium fit, and 3=Tight fit.The second character is a letter. A=External thread and B=Internal thread.In the Unified Inch thread system, only classes 1A & 2A have an allowance. The allowance for the two classes is the same.The other 4 classes have an allowance of Zero.All the internal thread profiles (B classes) have no allowance.Classes 1A & 1B: These classes are suitable for applications where a liberal tolerance and allowance are required to permit easy assembly. The maximum diameters of Class 1A threads are smaller than the basic diameter by the allowance amount. The minimum diameters of Class 1B threads are equal to the basic diameters and consequently afford no allowance at maximum material condition.Classes 2A & 2B: Classes 2A (external) and 2B (internal) are the default classes used for the commercial production of Nut, Bols, and otehr threaded fasteners. They are the default class unless otherwise specified. they have the same allowance as classes 1A/1B. However, they have a narrower tolerance field. The difficulty of assembly is the same, but the spread between different parts in a production batch is smaller.Classes 3A & 3B: These classes are suitable for applications where tight fit and accuracy of thread elements are essential. The maximum diameters of Class 3A threads and the minimum diameters of Class 3B threads are the same (Both have zero allowance). The accuracy is high, but the assembly is difficult.Combinations of Classes: The engineer can select any valid class for the male and female threads to achieve his design goals. The valid classes are defined in ASTM B1.1 as follows:Classes 2A, 2A, 3B, and 3B are always valid.Classes 1A & 1B are valid only for UNC threads with a nominal diameter equal to or larger than 1/4″.Unified Thread Allowance.The allowance es should be calculated for external threads with classes 1A and 2A. The allowance of both classes is the same and equals 0.3 times the pitch diameter tolerance of class 2A. It is the function of 3 parameters.D – Basic (nominal diameter)P – Pitch (1/TPI)LE – Length of engagement. If not explicitly specified, the length of engagement is assumed to be 5 pitches. (LE=5*P)All parameters are in inches$ \large es = 0.3 \times \left [ 0.0015 \times \sqrt[3]{D} + 0.0015 \times \sqrt{LE} + 0.015 \times \sqrt[3]{P^{2}} \right ] $\begin{array} \large \,es& = 0.3 \times\,[\,0.0015 \times \sqrt[3]{D} &\\ & +\,0.0015 \times \sqrt{LE}&\\ & + 0.015 \times \sqrt[3]{P^{2}}\,] \end{array}The result should be rounded to 6 decimal places.ASTM B1.1 lists in a long chart the allowance for each thread size. However, the results of this formula are 100% accurate, and there is no need to browse the chart.You can use our Advanced Threading Calculator to obtain the allowance according to a thread description or use the mini-calculator below.Unified Thread Allowance CalculatorPayment options Unified Thread TolerancesThe tolerances TD for internal threads and Td for external threads are derived from the class. The tolerances can be calculated according to the below formulas.Td – Tolerance for External Major DiameterTd2 – Tolerance for External Pitch DiameterTD1 – Tolerance for Internal Minor DiameterTD2 – Tolerance for Internal Pitch DiameterT – Base Tolerance (The tolerance of CLASS 2A pitch diameter is the base tolerance from which other tolerances are derived)D – Basic thread diameter.P – Pitch (1/TPI).LE – Length of engagement. (If unknown, the default is 5 * P)All input parameters and results are in Inches.Base Tolerance Formula$ \large T = 0.0015 \times \sqrt[3]{D} + 0.0015 \times \sqrt{LE} + 0.015 \times \sqrt[3]{P^{2}}$\begin{array} \large \,T& = \,0.0015 \times \sqrt[3]{D} &\\ & +\,0.0015 \times \sqrt{LE}&\\ & + 0.015 \times \sqrt[3]{P^{2}} \end{array}Formulas for External thread(Classes 1A,2A & 3A)$ \large T_{d(1A)} = 0.3 \times T $$ \large T_{d2(1A)} = 1.5 \times T $$ \large T_{d(2A)} = 0.06 \times \sqrt[3]{P^2} $$ \large T_{d2(2A)} = T $$ \large T_{d(3A)} = 0.06 \times \sqrt[3]{P^2} $$ \large T_{d2(3A)} = 0.75 \times T $Formulas for Internal Thread(Classes 1B,2B & 3B)$ \large T_{d1(1B)} = 0.25 \times P\,-\,0.4 \times P^{2} $$ \large T_{d2(1B)} = 1.95 \times T $$ \large T_{d1(2B)} = 0.25 \times P\,-\,0.4 \times P^{2} $$ \large T_{d2(2B)} = 1.30 \times T $$\begin{array}{ll} \large T_{d1(3B)}=&0.05 \times \sqrt[3]{P} + &\\ &0.003 \times \frac{P}{D}\,-\,0.002 \end{array} $$ \large T_{d2(3B)} = 0.975 \times T $The above formulas can be used in most cases. However, ASTM B1.1 lists various scenarios where other formulas or quirky rounding rules apply. Use our Advanced Threading Calculator to get exact results for any thread.Usage notes for the above formulas:The result should be rounded to 6 decimal places.Formulas for external threads are valid for all threads.Formulas for internal threads are valid only for thread diameters above 1/4″, a pitch between 4 and 80 TPI, and engagement lengths up to 1.5 X D.In some cases, ASTM B1.1 dictates special rounding rules.You can use the Threading Calculator, which automatically considers all the above rules.Unified Thread limits CalculationsOnce the Td, TD, & es values are known, the final limits can be calculated according to the formulas below.Formulas for Limits of a Unified Inch External Thread$ \large d_{max}=d-{es} $$ \large d_{min}=d_{max}-T_d $$ \large d_{2max} = d2 – es $$ \large d_{2min}=d_{2max}-T_{d2} $Formulas for Limits of a Unified Inch InternalThread$ \large D_{1min}=D $$ \large D_{1max}=D_{1min}+T_{D1} $$ \large D_{2minx} = D_2 $$ \large D_{2max}=D_{2min}+ T_{D2} $Related Glossary Terms:PitchThread Allowance (es)Major DiameterTooth per inch (tpi)Lead (Threading)Minor DiameterPitch DiameterFundamental TriangleThread Height (Depth)Thread addendumTap Drill SizeMaximum material condition (MMC)Length of Engagement

Click icon to show Full Thread DataThreadBasic DiamTPIPitchPitch DiamThread HeightCres/ RootTap Drill SizeLead AngleMinor DiameterThread addendumseriesid#12 - 32 UNEF0.216320.03130.19570.01690.00780.18762.91°0.17880.0101Metric Values ➢Classes & Tolerances ➢UNEF231/4 - 32 UNEF0.25320.03130.22970.01690.00780.22162.48°0.21280.0101Metric Values ➢Classes & Tolerances ➢UNEF285/16 - 32 UNEF0.312320.03130.29170.01690.00780.28361.95°0.27480.0101Metric Values ➢Classes & Tolerances ➢UNEF343/8 - 32 UNEF0.375320.03130.35470.01690.00780.34661.61°0.33780.0101Metric Values ➢Classes & Tolerances ➢UNEF407/16 - 28 UNEF0.437280.03570.41380.01930.00890.40451.57°0.39450.0116Metric Values ➢Classes & Tolerances ➢UNEF471/2 - 28 UNEF0.5280.03570.47680.01930.00890.46751.37°0.45750.0116Metric Values ➢Classes & Tolerances ➢UNEF549/16 - 24 UNEF0.562240.04170.53490.02260.01040.52411.42°0.51240.0135Metric Values ➢Classes & Tolerances ➢UNEF615/8 - 24 UNEF0.625240.04170.59790.02260.01040.58711.27°0.57540.0135Metric Values ➢Classes & Tolerances ➢UNEF6911/16 - 24 UNEF0.687240.04170.65990.02260.01040.64911.15°0.63740.0135Metric Values ➢Classes & Tolerances ➢UNEF753/4 - 20 UNEF0.75200.05000.71750.02710.01250.70451.27°0.69050.0162Metric Values ➢Classes & Tolerances ➢UNEF8313/16 - 20 UNEF0.812200.05000.77950.02710.01250.76651.17°0.75250.0162Metric Values ➢Classes & Tolerances ➢UNEF897/8 - 20 UNEF0.875200.05000.84250.02710.01250.82951.08°0.81550.0162Metric Values ➢Classes & Tolerances ➢UNEF9715/16 - 20 UNEF0.937200.05000.90450.02710.01250.89151.01°0.87750.0162Metric Values ➢Classes & Tolerances ➢UNEF1031 - 20 UNEF1200.05000.96750.02710.01250.95450.94°0.94050.0162Metric Values ➢Classes & Tolerances ➢UNEF1111 1/16 - 18 UNEF1.062180.05561.02590.03010.01391.01140.99°0.99580.018Metric Values ➢Classes & Tolerances ➢UNEF1181 1/8 - 18 UNEF1.125180.05561.08890.03010.01391.07440.93°1.05880.018Metric Values ➢Classes & Tolerances ➢UNEF1261 3/16 - 18 UNEF1.187180.05561.15090.03010.01391.13640.88°1.12080.018Metric Values ➢Classes & Tolerances ➢UNEF1321 1/4 - 18 UNEF1.25180.05561.21390.03010.01391.19940.83°1.18380.018Metric Values ➢Classes & Tolerances ➢UNEF1401 5/16 - 18 UNEF1.312180.05561.27590.03010.01391.26140.79°1.24580.018Metric Values ➢Classes & Tolerances ➢UNEF1461 3/8 - 18 UNEF1.375180.05561.33890.03010.01391.32440.76°1.30880.018Metric Values ➢Classes & Tolerances ➢UNEF1541 7/16 - 18 UNEF1.437180.05561.40090.03010.01391.38640.72°1.37080.018Metric Values ➢Classes & Tolerances ➢UNEF1611 1/2 - 18 UNEF1.5180.05561.46390.03010.01391.44940.69°1.43380.018Metric Values ➢Classes & Tolerances ➢UNEF1701 9/16 - 18 UNEF1.562180.05561.52590.03010.01391.51140.66°1.49580.018Metric Values ➢Classes & Tolerances ➢UNEF1771 5/8 - 18 UNEF1.625180.05561.58890.03010.01391.57440.64°1.55880.018Metric Values ➢Classes & Tolerances ➢UNEF1831 11/16 - 18 UNEF1.687180.05561.65090.03010.01391.63640.61°1.62080.018Metric Values ➢Classes & Tolerances ➢UNEF189UN Constant Pitch Series Basic Dimensions chartClick the Thread Link to get the Full Thread Data for all classesAll dimensions are in inches. To view the Metric translation, click the Thread LinkClick icon to show Additional columnsClick icon to show Full Thread DataThreadBasic DiamTPIPitchPitch DiamThread HeightCres/ RootTap Drill SizeLead AngleMinor DiameterThread addendumseriesid9/16 - 12 12-UN0.562120.08330.50790.04510.02080.48622.99°0.46280.0271Metric Values ➢Classes & Tolerances ➢12-UN625/8 - 12 12-UN0.625120.08330.57090.04510.02080.54922.66°0.52580.0271Metric Values ➢Classes & Tolerances ➢12-UN7011/16 - 12 12-UN0.687120.08330.63290.04510.02080.61122.4°0.58780.0271Metric Values ➢Classes & Tolerances ➢12-UN763/4 - 12 12-UN0.75120.08330.69590.04510.02080.67422.18°0.65080.0271Metric Values ➢Classes & Tolerances ➢12-UN8413/16 - 12 12-UN0.812120.08330.75790.04510.02080.73622°0.71280.0271Metric Values ➢Classes & Tolerances ➢12-UN907/8 - 12 12-UN0.875120.08330.82090.04510.02080.79921.85°0.77580.0271Metric Values ➢Classes & Tolerances ➢12-UN9815/16 - 12 12-UN0.937120.08330.88290.04510.02080.86121.72°0.83780.0271Metric Values ➢Classes & Tolerances ➢12-UN1041 - 12 12-UN1120.08330.94590.04510.02080.92421.61°0.90080.0271Metric Values ➢Classes & Tolerances ➢12-UN1131 1/16 - 12 12-UN1.062120.08331.00790.04510.02080.98621.51°0.96280.0271Metric Values ➢Classes & Tolerances ➢12-UN1201 1/8 - 12 12-UN1.125120.08331.07090.04510.02081.04921.42°1.02580.0271Metric Values ➢Classes & Tolerances ➢12-UN1281 3/16 - 12 12-UN1.187120.08331.13290.04510.02081.11121.34°1.08780.0271Metric Values ➢Classes & Tolerances ➢12-UN1341 1/4 - 12 12-UN1.25120.08331.19590.04510.02081.17421.27°1.15080.0271Metric Values ➢Classes & Tolerances ➢12-UN1421 5/16 - 12 12-UN1.312120.08331.25790.04510.02081.23621.21°1.21280.0271Metric Values ➢Classes & Tolerances ➢12-UN1481 3/8 - 12 12-UN1.375120.08331.32090.04510.02081.29921.15°1.27580.0271Metric Values ➢Classes & Tolerances ➢12-UN1571 7/16 - 12 12-UN1.437120.08331.38290.04510.02081.36121.1°1.33780.0271Metric Values ➢Classes & Tolerances ➢12-UN1641 1/2 - 12 12-UN1.5120.08331.44590.04510.02081.42421.05°1.40080.0271Metric Values ➢Classes & Tolerances ➢12-UN1731 9/16 - 12 12-UN1.562120.08331.50790.04510.02081.48621.01°1.46280.0271Metric Values ➢Classes & Tolerances ➢12-UN1801 5/8 - 12 12-UN1.625120.08331.57090.04510.02081.54920.97°1.52580.0271Metric Values ➢Classes & Tolerances ➢12-UN1861 11/16 - 12 12-UN1.687120.08331.63290.04510.02081.61120.93°1.58780.0271Metric Values ➢Classes & Tolerances ➢12-UN1921 3/4 - 12 12-UN1.75120.08331.69590.04510.02081.67420.9°1.65080.0271Metric Values ➢Classes & Tolerances ➢12-UN1981 13/16 - 12 12-UN1.812120.08331.75790.04510.02081.73620.86°1.71280.0271Metric Values ➢Classes & Tolerances ➢12-UN2031 7/8 - 12 12-UN1.875120.08331.82090.04510.02081.79920.83°1.77580.0271Metric Values ➢Classes & Tolerances ➢12-UN2081 15/16 - 12 12-UN1.937120.08331.88290.04510.02081.86120.81°1.83780.0271Metric Values ➢Classes & Tolerances ➢12-UN2132 - 12 12-UN2120.08331.94590.04510.02081.92420.78°1.90080.0271Metric Values ➢Classes & Tolerances ➢12-UN2192 1/8 - 12 12-UN2.125120.08332.07090.04510.02082.04920.73°2.02580.0271Metric Values ➢Classes & Tolerances ➢12-UN2242 1/4 - 12 12-UN2.25120.08332.19590.04510.02082.17420.69°2.15080.0271Metric Values ➢Classes & Tolerances ➢12-UN2302 3/8 - 12 12-UN2.375120.08332.32090.04510.02082.29920.65°2.27580.0271Metric Values ➢Classes & Tolerances ➢12-UN2352 1/2 - 12 12-UN2.5120.08332.44590.04510.02082.42420.62°2.40080.0271Metric Values ➢Classes & Tolerances ➢12-UN2422 5/8 - 12 12-UN2.625120.08332.57090.04510.02082.54920.59°2.52580.0271Metric Values ➢Classes & Tolerances ➢12-UN2482 3/4 - 12 12-UN2.75120.08332.69590.04510.02082.67420.56°2.65080.0271Metric Values ➢Classes & Tolerances ➢12-UN2552 7/8 - 12 12-UN2.875120.08332.82090.04510.02082.79920.54°2.77580.0271Metric Values ➢Classes & Tolerances ➢12-UN2613 - 12 12-UN3120.08332.94590.04510.02082.92420.52°2.90080.0271Metric Values ➢Classes & Tolerances ➢12-UN2683 1/8 - 12 12-UN3.125120.08333.07090.04510.02083.04920.49°3.02580.0271Metric Values ➢Classes & Tolerances ➢12-UN2743 1/4 - 12 12-UN3.25120.08333.19590.04510.02083.17420.48°3.15080.0271Metric Values ➢Classes & Tolerances ➢12-UN2803 3/8 - 12 12-UN3.375120.08333.32090.04510.02083.29920.46°3.27580.0271Metric Values ➢Classes & Tolerances ➢12-UN2853 1/2 - 12 12-UN3.5120.08333.44590.04510.02083.42420.44°3.40080.0271Metric Values ➢Classes & Tolerances ➢12-UN2913 5/8 - 12 12-UN3.625120.08333.57090.04510.02083.54920.43°3.52580.0271Metric Values ➢Classes & Tolerances ➢12-UN2963 3/4 - 12 12-UN3.75120.08333.69590.04510.02083.67420.41°3.65080.0271Metric Values ➢Classes & Tolerances ➢12-UN3023 7/8 - 12 12-UN3.875120.08333.82090.04510.02083.79920.4°3.77580.0271Metric Values ➢Classes & Tolerances ➢12-UN3074 - 12 12-UN4120.08333.94590.04510.02083.92420.39°3.90080.0271Metric Values ➢Classes & Tolerances ➢12-UN3134 1/8 - 12 12-UN4.125120.08334.07090.04510.02084.04920.37°4.02580.0271Metric Values ➢Classes & Tolerances ➢12-UN3184 1/4 - 12 12-UN4.25120.08334.19590.04510.02084.17420.36°4.15080.0271Metric Values ➢Classes & Tolerances ➢12-UN3234 3/8 - 12 12-UN4.375120.08334.32090.04510.02084.29920.35°4.27580.0271Metric Values ➢Classes & Tolerances ➢12-UN3284 1/2 - 12 12-UN4.5120.08334.44590.04510.02084.42420.34°4.40080.0271Metric Values ➢Classes & Tolerances ➢12-UN3334 5/8 - 12 12-UN4.625120.08334.57090.04510.02084.54920.33°4.52580.0271Metric Values ➢Classes & Tolerances ➢12-UN3384 3/4 - 12 12-UN4.75120.08334.69590.04510.02084.67420.32°4.65080.0271Metric Values ➢Classes & Tolerances ➢12-UN3444 7/8 - 12 12-UN4.875120.08334.82090.04510.02084.79920.32°4.77580.0271Metric Values ➢Classes & Tolerances ➢12-UN3495 - 12 12-UN5120.08334.94590.04510.02084.92420.31°4.90080.0271Metric Values ➢Classes & Tolerances ➢12-UN3545 1/8 - 12 12-UN5.125120.08335.07090.04510.02085.04920.3°5.02580.0271Metric Values ➢Classes & Tolerances ➢12-UN3595 1/4 - 12 12-UN5.25120.08335.19590.04510.02085.17420.29°5.15080.0271Metric Values ➢Classes & Tolerances ➢12-UN3645 3/8 - 12 12-UN5.375120.08335.32090.04510.02085.29920.29°5.27580.0271Metric Values ➢Classes & Tolerances ➢12-UN3695 1/2 - 12 12-UN5.5120.08335.44590.04510.02085.42420.28°5.40080.0271Metric Values ➢Classes & Tolerances ➢12-UN3745 5/8 - 12 12-UN5.625120.08335.57090.04510.02085.54920.27°5.52580.0271Metric Values ➢Classes & Tolerances ➢12-UN3795 3/4 - 12 12-UN5.75120.08335.69590.04510.02085.67420.27°5.65080.0271Metric Values ➢Classes & Tolerances ➢12-UN3845 7/8 - 12 12-UN5.875120.08335.82090.04510.02085.79920.26°5.77580.0271Metric Values ➢Classes & Tolerances ➢12-UN3896 - 12 12-UN6120.08335.94590.04510.02085.92420.26°5.90080.0271Metric Values ➢Classes & Tolerances ➢12-UN3943/8 - 16 16-UN0.375160.06250.33440.03380.01560.31813.4°0.30060.0203Metric Values ➢Classes & Tolerances ➢16-UN417/16 - 16 16-UN0.437160.06250.39640.03380.01560.38012.87°0.36260.0203Metric Values ➢Classes & Tolerances ➢16-UN481/2 - 16 16-UN0.5160.06250.45940.03380.01560.44312.48°0.42560.0203Metric Values ➢Classes & Tolerances ➢16-UN559/16 - 16 16-UN0.562160.06250.52140.03380.01560.50512.19°0.48760.0203Metric Values ➢Classes & Tolerances ➢16-UN635/8 - 16 16-UN0.625160.06250.58440.03380.01560.56811.95°0.55060.0203Metric Values ➢Classes & Tolerances ➢16-UN7111/16 - 16 16-UN0.687160.06250.64640.03380.01560.63011.76°0.61260.0203Metric Values ➢Classes & Tolerances ➢16-UN773/4 - 16 16-UN0.75160.06250.70940.03380.01560.69311.61°0.67560.0203Metric Values ➢Classes & Tolerances ➢16-UN8513/16 - 16 16-UN0.812160.06250.77140.03380.01560.75511.48°0.73760.0203Metric Values ➢Classes & Tolerances ➢16-UN917/8 - 16 16-UN0.875160.06250.83440.03380.01560.81811.37°0.80060.0203Metric Values ➢Classes & Tolerances ➢16-UN9915/16 - 16 16-UN0.937160.06250.89640.03380.01560.88011.27°0.86260.0203Metric Values ➢Classes & Tolerances ➢16-UN1051 - 16 16-UN1160.06250.95940.03380.01560.94311.19°0.92560.0203Metric Values ➢Classes & Tolerances ➢16-UN1141 1/16 - 16 16-UN1.062160.06251.02140.03380.01561.00511.12°0.98760.0203Metric Values ➢Classes & Tolerances ➢16-UN1211 1/8 - 16 16-UN1.125160.06251.08440.03380.01561.06811.05°1.05060.0203Metric Values ➢Classes & Tolerances ➢16-UN1291 3/16 - 16 16-UN1.187160.06251.14640.03380.01561.13010.99°1.11260.0203Metric Values ➢Classes & Tolerances ➢16-UN1351 1/4 - 16 16-UN1.25160.06251.20940.03380.01561.19310.94°1.17560.0203Metric Values ➢Classes & Tolerances ➢16-UN1431 5/16 - 16 16-UN1.312160.06251.27140.03380.01561.25510.9°1.23760.0203Metric Values ➢Classes & Tolerances ➢16-UN1491 3/8 - 16 16-UN1.375160.06251.33440.03380.01561.31810.85°1.30060.0203Metric Values ➢Classes & Tolerances ➢16-UN1581 7/16 - 16 16-UN1.437160.06251.39640.03380.01561.38010.82°1.36260.0203Metric Values ➢Classes & Tolerances ➢16-UN1651 1/2 - 16 16-UN1.5160.06251.45940.03380.01561.44310.78°1.42560.0203Metric Values ➢Classes & Tolerances ➢16-UN1741 9/16 - 16 16-UN1.562160.06251.52140.03380.01561.50510.75°1.48760.0203Metric Values ➢Classes & Tolerances ➢16-UN1811 5/8 - 16 16-UN1.625160.06251.58440.03380.01561.56810.72°1.55060.0203Metric Values ➢Classes & Tolerances ➢16-UN1871 11/16 - 16 16-UN1.687160.06251.64640.03380.01561.63010.69°1.61260.0203Metric Values ➢Classes & Tolerances ➢16-UN1931 3/4 - 16 16-UN1.75160.06251.70940.03380.01561.69310.67°1.67560.0203Metric Values ➢Classes & Tolerances ➢16-UN1991 13/16 - 16 16-UN1.812160.06251.77140.03380.01561.75510.64°1.73760.0203Metric Values ➢Classes & Tolerances ➢16-UN2041 7/8 - 16 16-UN1.875160.06251.83440.03380.01561.81810.62°1.80060.0203Metric Values ➢Classes & Tolerances ➢16-UN2091 15/16 - 16 16-UN1.937160.06251.89640.03380.01561.88010.6°1.86260.0203Metric Values ➢Classes & Tolerances ➢16-UN2142 - 16 16-UN2160.06251.95940.03380.01561.94310.58°1.92560.0203Metric Values ➢Classes & Tolerances ➢16-UN2202 1/8 - 16 16-UN2.125160.06252.08440.03380.01562.06810.55°2.05060.0203Metric Values ➢Classes & Tolerances ➢16-UN2252 1/4 - 16 16-UN2.25160.06252.20940.03380.01562.19310.52°2.17560.0203Metric Values ➢Classes & Tolerances ➢16-UN2312 3/8 - 16 16-UN2.375160.06252.33440.03380.01562.31810.49°2.30060.0203Metric Values ➢Classes & Tolerances ➢16-UN2362 1/2 - 16 16-UN2.5160.06252.45940.03380.01562.44310.46°2.42560.0203Metric Values ➢Classes & Tolerances ➢16-UN2432 5/8 - 16 16-UN2.625160.06252.58440.03380.01562.56810.44°2.55060.0203Metric Values ➢Classes & Tolerances ➢16-UN2492 3/4 - 16 16-UN2.75160.06252.70940.03380.01562.69310.42°2.67560.0203Metric Values ➢Classes & Tolerances ➢16-UN2562 7/8 - 16 16-UN2.875160.06252.83440.03380.01562.81810.4°2.80060.0203Metric Values ➢Classes & Tolerances ➢16-UN2623 - 16 16-UN3160.06252.95940.03380.01562.94310.39°2.92560.0203Metric Values ➢Classes & Tolerances ➢16-UN2693 1/8 - 16 16-UN3.125160.06253.08440.03380.01563.06810.37°3.05060.0203Metric Values ➢Classes & Tolerances ➢16-UN2753 1/4 - 16 16-UN3.25160.06253.20940.03380.01563.19310.36°3.17560.0203Metric Values ➢Classes & Tolerances ➢16-UN2813 3/8 - 16 16-UN3.375160.06253.33440.03380.01563.31810.34°3.30060.0203Metric Values ➢Classes & Tolerances ➢16-UN2863 1/2 - 16 16-UN3.5160.06253.45940.03380.01563.44310.33°3.42560.0203Metric Values ➢Classes & Tolerances ➢16-UN2923 5/8 - 16 16-UN3.625160.06253.58440.03380.01563.56810.32°3.55060.0203Metric Values ➢Classes & Tolerances ➢16-UN2973 3/4 - 16 16-UN3.75160.06253.70940.03380.01563.69310.31°3.67560.0203Metric Values ➢Classes & Tolerances ➢16-UN3033 7/8 - 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6 6-UN1.7560.16671.64170.09020.04171.59831.85°1.55150.0541Metric Values ➢Classes & Tolerances ➢6-UN1961 13/16 - 6 6-UN1.81260.16671.70370.09020.04171.66031.78°1.61350.0541Metric Values ➢Classes & Tolerances ➢6-UN2011 7/8 - 6 6-UN1.87560.16671.76670.09020.04171.72331.72°1.67650.0541Metric Values ➢Classes & Tolerances ➢6-UN2061 15/16 - 6 6-UN1.93760.16671.82870.09020.04171.78531.66°1.73850.0541Metric Values ➢Classes & Tolerances ➢6-UN2112 - 6 6-UN260.16671.89170.09020.04171.84831.61°1.80150.0541Metric Values ➢Classes & Tolerances ➢6-UN2172 1/8 - 6 6-UN2.12560.16672.01670.09020.04171.97331.51°1.92650.0541Metric Values ➢Classes & Tolerances ➢6-UN2222 1/4 - 6 6-UN2.2560.16672.14170.09020.04172.09831.42°2.05150.0541Metric Values ➢Classes & Tolerances ➢6-UN2282 3/8 - 6 6-UN2.37560.16672.26670.09020.04172.22331.34°2.17650.0541Metric Values ➢Classes & Tolerances ➢6-UN2332 1/2 - 6 6-UN2.560.16672.39170.09020.04172.34831.27°2.30150.0541Metric Values ➢Classes & Tolerances ➢6-UN2402 5/8 - 6 6-UN2.62560.16672.51670.09020.04172.47331.21°2.42650.0541Metric Values ➢Classes & Tolerances ➢6-UN2462 3/4 - 6 6-UN2.7560.16672.64170.09020.04172.59831.15°2.55150.0541Metric Values ➢Classes & Tolerances ➢6-UN2532 7/8 - 6 6-UN2.87560.16672.76670.09020.04172.72331.1°2.67650.0541Metric Values ➢Classes & Tolerances ➢6-UN2593 - 6 6-UN360.16672.89170.09020.04172.84831.05°2.80150.0541Metric Values ➢Classes & Tolerances ➢6-UN2663 1/8 - 6 6-UN3.12560.16673.01670.09020.04172.97331.01°2.92650.0541Metric Values ➢Classes & Tolerances ➢6-UN2723 1/4 - 6 6-UN3.2560.16673.14170.09020.04173.09830.97°3.05150.0541Metric Values ➢Classes & Tolerances ➢6-UN2783 3/8 - 6 6-UN3.37560.16673.26670.09020.04173.22330.93°3.17650.0541Metric Values ➢Classes & Tolerances ➢6-UN2833 1/2 - 6 6-UN3.560.16673.39170.09020.04173.34830.9°3.30150.0541Metric Values ➢Classes & Tolerances ➢6-UN2893 5/8 - 6 6-UN3.62560.16673.51670.09020.04173.47330.86°3.42650.0541Metric Values ➢Classes & Tolerances ➢6-UN2943 3/4 - 6 6-UN3.7560.16673.64170.09020.04173.59830.83°3.55150.0541Metric Values ➢Classes & Tolerances ➢6-UN3003 7/8 - 6 6-UN3.87560.16673.76670.09020.04173.72330.81°3.67650.0541Metric Values ➢Classes & Tolerances ➢6-UN3054 - 6 6-UN460.16673.89170.09020.04173.84830.78°3.80150.0541Metric Values ➢Classes & Tolerances ➢6-UN3114 1/8 - 6 6-UN4.12560.16674.01670.09020.04173.97330.76°3.92650.0541Metric Values ➢Classes & Tolerances ➢6-UN3164 1/4 - 6 6-UN4.2560.16674.14170.09020.04174.09830.73°4.05150.0541Metric Values ➢Classes & Tolerances ➢6-UN3214 3/8 - 6 6-UN4.37560.16674.26670.09020.04174.22330.71°4.17650.0541Metric Values ➢Classes & Tolerances ➢6-UN3264 1/2 - 6 6-UN4.560.16674.39170.09020.04174.34830.69°4.30150.0541Metric Values ➢Classes & Tolerances ➢6-UN3314 5/8 - 6 6-UN4.62560.16674.51670.09020.04174.47330.67°4.42650.0541Metric Values ➢Classes & Tolerances ➢6-UN3364 3/4 - 6 6-UN4.7560.16674.64170.09020.04174.59830.65°4.55150.0541Metric Values ➢Classes & Tolerances ➢6-UN3424 7/8 - 6 6-UN4.87560.16674.76670.09020.04174.72330.64°4.67650.0541Metric Values ➢Classes & Tolerances ➢6-UN3475 - 6 6-UN560.16674.89170.09020.04174.84830.62°4.80150.0541Metric Values ➢Classes & Tolerances ➢6-UN3525 1/8 - 6 6-UN5.12560.16675.01670.09020.04174.97330.61°4.92650.0541Metric Values ➢Classes & Tolerances ➢6-UN3575 1/4 - 6 6-UN5.2560.16675.14170.09020.04175.09830.59°5.05150.0541Metric Values ➢Classes & Tolerances ➢6-UN3625 3/8 - 6 6-UN5.37560.16675.26670.09020.04175.22330.58°5.17650.0541Metric Values ➢Classes & Tolerances ➢6-UN3675 1/2 - 6 6-UN5.560.16675.39170.09020.04175.34830.56°5.30150.0541Metric Values ➢Classes & Tolerances ➢6-UN3725 5/8 - 6 6-UN5.62560.16675.51670.09020.04175.47330.55°5.42650.0541Metric Values ➢Classes & Tolerances ➢6-UN3775 3/4 - 6 6-UN5.7560.16675.64170.09020.04175.59830.54°5.55150.0541Metric Values ➢Classes & Tolerances ➢6-UN3825 7/8 - 6 6-UN5.87560.16675.76670.09020.04175.72330.53°5.67650.0541Metric Values ➢Classes & Tolerances ➢6-UN3876 - 6 6-UN660.16675.89170.09020.04175.84830.52°5.80150.0541Metric Values ➢Classes & Tolerances ➢6-UN3921 - 8 8-UN180.12500.91880.06770.03130.88632.48°0.85120.0406Metric Values ➢Classes & Tolerances ➢8-UN1121 1/16 - 8 8-UN1.06280.12500.98080.06770.03130.94832.32°0.91320.0406Metric Values ➢Classes & Tolerances ➢8-UN1191 1/8 - 8 8-UN1.12580.12501.04380.06770.03131.01132.18°0.97620.0406Metric Values ➢Classes & Tolerances ➢8-UN1271 3/16 - 8 8-UN1.18780.12501.10580.06770.03131.07332.06°1.03820.0406Metric Values ➢Classes & Tolerances ➢8-UN1331 1/4 - 8 8-UN1.2580.12501.16880.06770.03131.13631.95°1.10120.0406Metric Values ➢Classes & Tolerances ➢8-UN1411 5/16 - 8 8-UN1.31280.12501.23080.06770.03131.19831.85°1.16320.0406Metric Values ➢Classes & Tolerances ➢8-UN1471 3/8 - 8 8-UN1.37580.12501.29380.06770.03131.26131.76°1.22620.0406Metric Values ➢Classes & Tolerances ➢8-UN1561 7/16 - 8 8-UN1.43780.12501.35580.06770.03131.32331.68°1.28820.0406Metric Values ➢Classes & Tolerances ➢8-UN1631 1/2 - 8 8-UN1.580.12501.41880.06770.03131.38631.61°1.35120.0406Metric Values ➢Classes & Tolerances ➢8-UN1721 9/16 - 8 8-UN1.56280.12501.48080.06770.03131.44831.54°1.41320.0406Metric Values ➢Classes & Tolerances ➢8-UN1791 5/8 - 8 8-UN1.62580.12501.54380.06770.03131.51131.48°1.47620.0406Metric Values ➢Classes & Tolerances ➢8-UN1851 11/16 - 8 8-UN1.68780.12501.60580.06770.03131.57331.42°1.53820.0406Metric Values ➢Classes & Tolerances ➢8-UN1911 3/4 - 8 8-UN1.7580.12501.66880.06770.03131.63631.37°1.60120.0406Metric Values ➢Classes & Tolerances ➢8-UN1971 13/16 - 8 8-UN1.81280.12501.73080.06770.03131.69831.32°1.66320.0406Metric Values ➢Classes & Tolerances ➢8-UN2021 7/8 - 8 8-UN1.87580.12501.79380.06770.03131.76131.27°1.72620.0406Metric Values ➢Classes & Tolerances ➢8-UN2071 15/16 - 8 8-UN1.93780.12501.85580.06770.03131.82331.23°1.78820.0406Metric Values ➢Classes & Tolerances ➢8-UN2122 - 8 8-UN280.12501.91880.06770.03131.88631.19°1.85120.0406Metric Values ➢Classes & Tolerances ➢8-UN2182 1/8 - 8 8-UN2.12580.12502.04380.06770.03132.01131.12°1.97620.0406Metric Values ➢Classes & Tolerances ➢8-UN2232 1/4 - 8 8-UN2.2580.12502.16880.06770.03132.13631.05°2.10120.0406Metric Values ➢Classes & Tolerances ➢8-UN2292 3/8 - 8 8-UN2.37580.12502.29380.06770.03132.26130.99°2.22620.0406Metric Values ➢Classes & Tolerances ➢8-UN2342 1/2 - 8 8-UN2.580.12502.41880.06770.03132.38630.94°2.35120.0406Metric Values ➢Classes & Tolerances ➢8-UN2412 5/8 - 8 8-UN2.62580.12502.54380.06770.03132.51130.9°2.47620.0406Metric Values ➢Classes & Tolerances ➢8-UN2472 3/4 - 8 8-UN2.7580.12502.66880.06770.03132.63630.85°2.60120.0406Metric Values ➢Classes & Tolerances ➢8-UN2542 7/8 - 8 8-UN2.87580.12502.79380.06770.03132.76130.82°2.72620.0406Metric Values ➢Classes & Tolerances ➢8-UN2603 - 8 8-UN380.12502.91880.06770.03132.88630.78°2.85120.0406Metric Values ➢Classes & Tolerances ➢8-UN2673 1/8 - 8 8-UN3.12580.12503.04380.06770.03133.01130.75°2.97620.0406Metric Values ➢Classes & Tolerances ➢8-UN2733 1/4 - 8 8-UN3.2580.12503.16880.06770.03133.13630.72°3.10120.0406Metric Values ➢Classes & Tolerances ➢8-UN2793 3/8 - 8 8-UN3.37580.12503.29380.06770.03133.26130.69°3.22620.0406Metric Values ➢Classes & Tolerances ➢8-UN2843 1/2 - 8 8-UN3.580.12503.41880.06770.03133.38630.67°3.35120.0406Metric Values ➢Classes & Tolerances ➢8-UN2903 5/8 - 8 8-UN3.62580.12503.54380.06770.03133.51130.64°3.47620.0406Metric Values ➢Classes & Tolerances ➢8-UN2953 3/4 - 8 8-UN3.7580.12503.66880.06770.03133.63630.62°3.60120.0406Metric Values ➢Classes & Tolerances ➢8-UN3013 7/8 - 8 8-UN3.87580.12503.79380.06770.03133.76130.6°3.72620.0406Metric Values ➢Classes & Tolerances ➢8-UN3064 - 8 8-UN480.12503.91880.06770.03133.88630.58°3.85120.0406Metric Values ➢Classes & Tolerances ➢8-UN3124 1/8 - 8 8-UN4.12580.12504.04380.06770.03134.01130.56°3.97620.0406Metric Values ➢Classes & Tolerances ➢8-UN3174 1/4 - 8 8-UN4.2580.12504.16880.06770.03134.13630.55°4.10120.0406Metric Values ➢Classes & Tolerances ➢8-UN3224 3/8 - 8 8-UN4.37580.12504.29380.06770.03134.26130.53°4.22620.0406Metric Values ➢Classes & Tolerances ➢8-UN3274 1/2 - 8 8-UN4.580.12504.41880.06770.03134.38630.52°4.35120.0406Metric Values ➢Classes & Tolerances ➢8-UN3324 5/8 - 8 8-UN4.62580.12504.54380.06770.03134.51130.5°4.47620.0406Metric Values ➢Classes & Tolerances ➢8-UN3374 3/4 - 8 8-UN4.7580.12504.66880.06770.03134.63630.49°4.60120.0406Metric Values ➢Classes & Tolerances ➢8-UN3434 7/8 - 8 8-UN4.87580.12504.79380.06770.03134.76130.48°4.72620.0406Metric Values ➢Classes & Tolerances ➢8-UN3485 - 8 8-UN580.12504.91880.06770.03134.88630.46°4.85120.0406Metric Values ➢Classes & Tolerances ➢8-UN3535 1/8 - 8 8-UN5.12580.12505.04380.06770.03135.01130.45°4.97620.0406Metric Values ➢Classes & Tolerances ➢8-UN3585 1/4 - 8 8-UN5.2580.12505.16880.06770.03135.13630.44°5.10120.0406Metric Values ➢Classes & Tolerances ➢8-UN3635 3/8 - 8 8-UN5.37580.12505.29380.06770.03135.26130.43°5.22620.0406Metric Values ➢Classes & Tolerances ➢8-UN3685 1/2 - 8 8-UN5.580.12505.41880.06770.03135.38630.42°5.35120.0406Metric Values ➢Classes & Tolerances ➢8-UN3735 5/8 - 8 8-UN5.62580.12505.54380.06770.03135.51130.41°5.47620.0406Metric Values ➢Classes & Tolerances ➢8-UN3785 3/4 - 8 8-UN5.7580.12505.66880.06770.03135.63630.4°5.60120.0406Metric Values ➢Classes & Tolerances ➢8-UN3835 7/8 - 8 8-UN5.87580.12505.79380.06770.03135.76130.39°5.72620.0406Metric Values ➢Classes & Tolerances ➢8-UN3886 - 8 8-UN680.12505.91880.06770.03135.88630.39°5.85120.0406Metric Values ➢Classes & Tolerances ➢8-UN393limits of Thread Dimensions (UNC, UNF & UNEF)To manufacture or measure a thread, one has to know the maximum and minimum permissible values of the basic dimensions. These values are calculated according to the thread class (See below). To understand classes, you first need to understand the terms Allowance (Sometimes referred to as deviation) and Tolerances.Definition of terms:Allowance (Deviation): The minimum permissible distance between the basic and actual profile.Tolerance: The width of the tolerance field of a diameter on the actual thread profile. (Pitch, Major & Minor diameters)A small allowance means that the assembly of a male and female thread will be harder, but after assembly, there will be less freedom of movement.A large allowance means that the assembly of a male and female thread will be easier, but after assembly, there will be more freedom of movement.The allowance size does not influence a thread’s production difficulty or price.A wide tolerance is easier and cheaper to produce but yields a larger spread between threads.A narrow tolerance is challenging to produce and more expensive but yields a smaller spread between threads.Unified Thread ClassesThe class is defined by a two-character code.The first character defines is a digit between 1 and 3. 1=Loose fit, 2=Medium fit, and 3=Tight fit.The second character is a letter. A=External thread and B=Internal thread.In the Unified Inch thread system, only classes 1A & 2A have an allowance. The allowance for the two classes is the same.The other 4 classes have an allowance of Zero.All the internal thread profiles (B classes) have no allowance.Classes 1A & 1B: These classes are suitable for applications where a liberal tolerance and allowance are required to permit easy assembly. The maximum diameters of Class 1A threads are smaller than the basic diameter by the allowance amount. The minimum diameters of Class 1B threads are equal to the basic diameters and consequently afford no allowance at maximum material condition.Classes 2A & 2B: Classes 2A (external) and 2B (internal) are the default classes used for the commercial production of Nut, Bols, and otehr threaded fasteners. They are the default class unless otherwise specified. they have the same allowance as classes 1A/1B. However, they have a narrower tolerance field. The difficulty of assembly is the same, but the spread between different parts in a production batch is smaller.Classes 3A & 3B: These classes are suitable for applications where tight fit and accuracy of thread elements are essential. The maximum diameters of Class 3A threads and the minimum diameters of Class 3B threads are the same (Both have zero allowance). The accuracy is high, but the assembly is difficult.Combinations of Classes: The engineer can select any valid class for the male and female threads to achieve his design goals. The valid classes are defined in ASTM B1.1 as follows:Classes 2A, 2A, 3B, and 3B are always valid.Classes 1A & 1B are valid only for UNC threads with a nominal diameter equal to or larger than 1/4″.Unified Thread Allowance.The allowance es should be calculated for external threads with classes 1A and 2A. The allowance of both classes is the same and equals 0.3 times the pitch diameter tolerance of class 2A. It is the function of 3 parameters.D – Basic (nominal diameter)P – Pitch (1/TPI)LE – Length of engagement. If not explicitly specified, the length of engagement is assumed to be 5 pitches. (LE=5*P)All parameters are in inches$ \large es = 0.3 \times \left [ 0.0015 \times \sqrt[3]{D} + 0.0015 \times \sqrt{LE} + 0.015 \times \sqrt[3]{P^{2}} \right ] $\begin{array} \large \,es& = 0.3 \times\,[\,0.0015 \times \sqrt[3]{D} &\\ & +\,0.0015 \times \sqrt{LE}&\\ & + 0.015 \times \sqrt[3]{P^{2}}\,] \end{array}The result should be rounded to 6 decimal places.ASTM B1.1 lists in a long chart the allowance for each thread size. However, the results of this formula are 100% accurate, and there is no need to browse the chart.You can use our Advanced Threading Calculator to obtain the allowance according to a thread description or use the mini-calculator below.Unified Thread Allowance CalculatorPayment options Unified Thread TolerancesThe tolerances TD for internal threads and Td for external threads are derived from the class. The tolerances can be calculated according to the below formulas.Td – Tolerance for External Major DiameterTd2 – Tolerance for External Pitch DiameterTD1 – Tolerance for Internal Minor DiameterTD2 – Tolerance for Internal Pitch DiameterT – Base Tolerance (The tolerance of CLASS 2A pitch diameter is the base tolerance from which other tolerances are derived)D – Basic thread diameter.P – Pitch (1/TPI).LE – Length of engagement. (If unknown, the default is 5 * P)All input parameters and results are in Inches.Base Tolerance Formula$ \large T = 0.0015 \times \sqrt[3]{D} + 0.0015 \times \sqrt{LE} + 0.015 \times \sqrt[3]{P^{2}}$\begin{array} \large \,T& = \,0.0015 \times \sqrt[3]{D} &\\ & +\,0.0015 \times \sqrt{LE}&\\ & + 0.015 \times \sqrt[3]{P^{2}} \end{array}Formulas for External thread(Classes 1A,2A & 3A)$ \large T_{d(1A)} = 0.3 \times T $$ \large T_{d2(1A)} = 1.5 \times T $$ \large T_{d(2A)} = 0.06 \times \sqrt[3]{P^2} $$ \large T_{d2(2A)} = T $$ \large T_{d(3A)} = 0.06 \times \sqrt[3]{P^2} $$ \large T_{d2(3A)} = 0.75 \times T $Formulas for Internal Thread(Classes 1B,2B & 3B)$ \large T_{d1(1B)} = 0.25 \times P\,-\,0.4 \times P^{2} $$ \large T_{d2(1B)} = 1.95 \times T $$ \large T_{d1(2B)} = 0.25 \times P\,-\,0.4 \times P^{2} $$ \large T_{d2(2B)} = 1.30 \times T $$\begin{array}{ll} \large T_{d1(3B)}=&0.05 \times \sqrt[3]{P} + &\\ &0.003 \times \frac{P}{D}\,-\,0.002 \end{array} $$ \large T_{d2(3B)} = 0.975 \times T $The above formulas can be used in most cases. However, ASTM B1.1 lists various scenarios where other formulas or quirky rounding rules apply. Use our Advanced Threading Calculator to get exact results for any thread.Usage notes for the above formulas:The result should be rounded to 6 decimal places.Formulas for external threads are valid for all threads.Formulas for internal threads are valid only for thread diameters above 1/4″, a pitch between 4 and 80 TPI, and engagement lengths up to 1.5 X D.In some cases, ASTM B1.1 dictates special rounding rules.You can use the Threading Calculator, which automatically considers all the above rules.Unified Thread limits CalculationsOnce the Td, TD, & es values are known, the final limits can be calculated according to the formulas below.Formulas for Limits of a Unified Inch External Thread$ \large d_{max}=d-{es} $$ \large d_{min}=d_{max}-T_d $$ \large d_{2max} = d2 – es $$ \large d_{2min}=d_{2max}-T_{d2} $Formulas for Limits of a Unified Inch InternalThread$ \large D_{1min}=D $$ \large D_{1max}=D_{1min}+T_{D1} $$ \large D_{2minx} = D_2 $$ \large D_{2max}=D_{2min}+ T_{D2} $Related Glossary Terms:PitchThread Allowance (es)Major DiameterTooth per inch (tpi)Lead (Threading)Minor DiameterPitch DiameterFundamental TriangleThread Height (Depth)Thread addendumTap Drill SizeMaximum material condition (MMC)Length of Engagement

Usage notes for the above formulas:The result should be rounded to 6 decimal places.Formulas for external threads are valid for all threads.Formulas for internal threads are valid only for thread diameters above 1/4″, a pitch between 4 and 80 TPI, and engagement lengths up to 1.5 X D.In some cases, ASTM B1.1 dictates special rounding rules.You can use the Threading Calculator, which automatically considers all the above rules.Unified Thread limits CalculationsOnce the Td, TD, & es values are known, the final limits can be calculated according to the formulas below.Formulas for Limits of a Unified Inch External Thread$ \large d_{max}=d-{es} $$ \large d_{min}=d_{max}-T_d $$ \large d_{2max} = d2 – es $$ \large d_{2min}=d_{2max}-T_{d2} $Formulas for Limits of a Unified Inch InternalThread$ \large D_{1min}=D $$ \large D_{1max}=D_{1min}+T_{D1} $$ \large D_{2minx} = D_2 $$ \large D_{2max}=D_{2min}+ T_{D2} $Related Glossary Terms:PitchThread Allowance (es)Major DiameterTooth per inch (tpi)Lead (Threading)Minor DiameterPitch DiameterFundamental TriangleThread Height (Depth)Thread addendumTap Drill SizeMaximum material condition (MMC)Length of Engagement

Diameter:From 1/4″ and above the diameters are given in inch fractions. For example 1/4″, 3/4″, 1 1/4″.Below 1/4″ the diameters are given by a series of numbers from #0 to #12. Each “number” describes an arbitrary diameter as shown in the below table.It is also allowed to denote the diameters with a decimal value. For example 0.250 (1/4″), 0.4375 (7/16″), etc.Standard Diameter numbers below 1/4″DiameterNumber#0#1#2#3#4#5#6#8#10#12Diameter(Inch)0.060.0730.0860.0990.1120.1250.1380.1640.190.216Diameter(mm)1.5241.85422.18442.51462.84483.1753.50524.16564.82605.4864Pitch:By default, the pitch is given in TPI. For example, 1/4-20 means a thread with a pitch of 20 TPI (1/20=0.05″).It is also allowed to denote the pitch by distance. For example, 1/4-0.05P means a thread with a pitch of 0.05″ (same as 20 TPI).Series:In most cases, the series will be UNC, UNF, or UNEF (Coarse, Fine, or Extra fine pitch).ASTM B1.1, also defines several constant pitch series. These are denoted by

Apr 4, 2015 — The one I use suggests for a 3mm dia 2 flute cutter with a cut depth of 1.5mm the spindle speed should be 16,000 rpm and feed rate 950mm/min for ...

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Jul 19, 2021 — Metric Drive Size Chart ; 6.7 mm. 0.2638. 6.7 ; 6.8 mm. 0.2677. 6.8 ; 6.9 mm. 0.2717. 6.9 ; 7 mm. 0.2756. 7.

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Click the Thread Link to get the Full Thread Data for all classesAll dimensions are in inches. To view the Metric translation, click the Thread LinkClick icon to show Additional columnsClick icon to show Full Thread DataThreadBasic DiamTPIPitchPitch DiamThread HeightCres/ RootTap Drill SizeLead AngleMinor DiameterThread addendumseriesid#1 - 64 UNC0.073640.01560.06290.00850.00390.05884.52°0.05440.0051Metric Values ➢Classes & Tolerances ➢UNC2#2 - 56 UNC0.086560.01790.07440.00970.00450.06984.37°0.06470.0058Metric Values ➢Classes & Tolerances ➢UNC4#3 - 48 UNC0.099480.02080.08550.01130.00520.084.44°0.07420.0068Metric Values ➢Classes & Tolerances ➢UNC6#4 - 40 UNC0.112400.02500.09580.01350.00630.08934.75°0.08220.0081Metric Values ➢Classes & Tolerances ➢UNC8#5 - 40 UNC0.125400.02500.10880.01350.00630.10234.18°0.09520.0081Metric Values ➢Classes & Tolerances ➢UNC10#6 - 32 UNC0.138320.03130.11770.01690.00780.10964.83°0.10080.0101Metric Values ➢Classes & Tolerances ➢UNC12#8 - 32 UNC0.164320.03130.14370.01690.00780.13563.96°0.12680.0101Metric Values ➢Classes & Tolerances ➢UNC15#10 - 24 UNC0.19240.04170.16290.02260.01040.15214.65°0.14040.0135Metric Values ➢Classes & Tolerances ➢UNC18#12 - 24 UNC0.216240.04170.18890.02260.01040.17814.02°0.16640.0135Metric Values ➢Classes & Tolerances ➢UNC211/4 - 20 UNC0.25200.05000.21750.02710.01250.20454.18°0.19050.0162Metric Values ➢Classes & Tolerances ➢UNC265/16 - 18 UNC0.312180.05560.27590.03010.01390.26143.67°0.24580.018Metric Values ➢Classes & Tolerances ➢UNC323/8 - 16 UNC0.375160.06250.33440.03380.01560.31813.4°0.30060.0203Metric Values ➢Classes & Tolerances ➢UNC387/16 - 14 UNC0.437140.07140.39060.03870.01790.3723.33°0.35190.0232Metric Values ➢Classes & Tolerances ➢UNC451/2 - 13 UNC0.5130.07690.450.04160.01920.433.11°0.40840.025Metric Values ➢Classes & Tolerances ➢UNC529/16 - 12 UNC0.562120.08330.50790.04510.02080.48622.99°0.46280.0271Metric Values ➢Classes & Tolerances ➢UNC595/8 - 11 UNC0.625110.09090.5660.04920.02270.54232.93°0.51670.0295Metric Values ➢Classes & Tolerances ➢UNC673/4 - 10 UNC0.75100.10000.6850.05410.0250.6592.66°0.63090.0325Metric Values ➢Classes & Tolerances ➢UNC817/8 - 9 UNC0.87590.11110.80280.06010.02780.77392.52°0.74270.0361Metric Values ➢Classes & Tolerances ➢UNC951 - 8 UNC180.12500.91880.06770.03130.88632.48°0.85120.0406Metric Values ➢Classes & Tolerances ➢UNC1091 1/8 - 7 UNC1.12570.14291.03220.07730.03570.9952.52°0.95490.0464Metric Values ➢Classes & Tolerances ➢UNC1241 1/4 - 7 UNC1.2570.14291.15720.07730.03571.122.25°1.07990.0464Metric Values ➢Classes & Tolerances ➢UNC1381 3/8 - 6 UNC1.37560.16671.26670.09020.04171.22332.4°1.17650.0541Metric Values ➢Classes & Tolerances ➢UNC1521 1/2 - 6 UNC1.560.16671.39170.09020.04171.34832.18°1.30150.0541Metric Values ➢Classes & Tolerances ➢UNC1681 3/4 - 5 UNC1.7550.20001.62010.10830.051.5682.25°1.51180.065Metric Values ➢Classes & Tolerances ➢UNC1952 - 4.5 UNC240.22221.85570.12030.05561.79782.18°1.73540.0722Metric Values ➢Classes & Tolerances ➢UNC2162 1/4 - 4.5 UNC2.2540.22222.10570.12030.05562.04781.92°1.98540.0722Metric Values ➢Classes & Tolerances ➢UNC2272 1/2 - 4 UNC2.540.25002.33760.13530.06252.27251.95°2.20230.0812Metric Values ➢Classes & Tolerances ➢UNC2382 3/4 - 4 UNC2.7540.25002.58760.13530.06252.52251.76°2.45230.0812Metric Values ➢Classes & Tolerances ➢UNC2513 - 4 UNC340.25002.83760.13530.06252.77251.61°2.70230.0812Metric Values ➢Classes & Tolerances ➢UNC2643 1/4 - 4 UNC3.2540.25003.08760.13530.06253.02251.48°2.95230.0812Metric Values ➢Classes & Tolerances ➢UNC2763 1/2 - 4 UNC3.540.25003.33760.13530.06253.27251.37°3.20230.0812Metric Values ➢Classes & Tolerances ➢UNC2873 3/4 - 4 UNC3.7540.25003.58760.13530.06253.52251.27°3.45230.0812Metric Values ➢Classes & Tolerances ➢UNC2984 - 4 UNC440.25003.83760.13530.06253.77251.19°3.70230.0812Metric Values ➢Classes & Tolerances ➢UNC309UNF Series Basic Dimensions chartClick the Thread Link to get the Full Thread Data for all classesAll dimensions are in inches. To view the Metric translation, click the Thread LinkClick icon to show Additional columnsClick icon to show Full Thread DataThreadBasic DiamTPIPitchPitch DiamThread HeightCres/ RootTap Drill SizeLead AngleMinor DiameterThread addendumseriesid#0 - 80 UNF0.06800.01250.05190.00680.00310.04864.39°0.04510.0041Metric Values ➢Classes & Tolerances ➢UNF1#1 - 72 UNF0.073720.01390.0640.00750.00350.06043.95°0.05650.0045Metric Values ➢Classes & Tolerances ➢UNF3#2 - 64 UNF0.086640.01560.07590.00850.00390.07183.75°0.06740.0051Metric Values ➢Classes & Tolerances ➢UNF5#3 - 56 UNF0.099560.01790.08740.00970.00450.08283.72°0.07770.0058Metric Values ➢Classes & Tolerances ➢UNF7#4 - 48 UNF0.112480.02080.09850.01130.00520.0933.85°0.08720.0068Metric Values ➢Classes & Tolerances ➢UNF9#5 - 44 UNF0.125440.02270.11020.01230.00570.10433.75°0.09790.0074Metric Values ➢Classes & Tolerances ➢UNF11#6 - 40 UNF0.138400.02500.12180.01350.00630.11533.74°0.10820.0081Metric Values ➢Classes & Tolerances ➢UNF13#8 - 36 UNF0.164360.02780.1460.0150.00690.13873.47°0.13090.009Metric Values ➢Classes & Tolerances ➢UNF16#10 - 32 UNF0.19320.03130.16970.01690.00780.16163.35°0.15280.0101Metric Values ➢Classes & Tolerances ➢UNF19#12 - 28 UNF0.216280.03570.19280.01930.00890.18353.37°0.17350.0116Metric Values ➢Classes & Tolerances ➢UNF221/4 - 28 UNF0.25280.03570.22680.01930.00890.21752.87°0.20750.0116Metric Values ➢Classes & Tolerances ➢UNF275/16 - 24 UNF0.312240.04170.28490.02260.01040.27412.67°0.26240.0135Metric Values ➢Classes & Tolerances ➢UNF333/8 - 24 UNF0.375240.04170.34790.02260.01040.33712.18°0.32540.0135Metric Values ➢Classes & Tolerances ➢UNF397/16 - 20 UNF0.437200.05000.40450.02710.01250.39152.25°0.37750.0162Metric Values ➢Classes & Tolerances ➢UNF461/2 - 20 UNF0.5200.05000.46750.02710.01250.45451.95°0.44050.0162Metric Values ➢Classes & Tolerances ➢UNF539/16 - 18 UNF0.562180.05560.52590.03010.01390.51141.93°0.49580.018Metric Values ➢Classes & Tolerances ➢UNF605/8 - 18 UNF0.625180.05560.58890.03010.01390.57441.72°0.55880.018Metric Values ➢Classes & Tolerances ➢UNF683/4 - 16 UNF0.75160.06250.70940.03380.01560.69311.61°0.67560.0203Metric Values ➢Classes & Tolerances ➢UNF827/8 - 14 UNF0.875140.07140.82860.03870.01790.811.57°0.78990.0232Metric Values ➢Classes & Tolerances ➢UNF961 - 12 UNF1120.08330.94590.04510.02080.92421.61°0.90080.0271Metric Values ➢Classes & Tolerances ➢UNF1101 1/8 - 12 UNF1.125120.08331.07090.04510.02081.04921.42°1.02580.0271Metric Values ➢Classes & Tolerances ➢UNF1251 1/4 - 12 UNF1.25120.08331.19590.04510.02081.17421.27°1.15080.0271Metric Values ➢Classes & Tolerances ➢UNF1391 3/8 - 12 UNF1.375120.08331.32090.04510.02081.29921.15°1.27580.0271Metric Values ➢Classes & Tolerances ➢UNF1531 1/2 - 12 UNF1.5120.08331.44590.04510.02081.42421.05°1.40080.0271Metric Values ➢Classes & Tolerances ➢UNF169UNEF Series Basic Dimensions chartClick the Thread Link to get the Full Thread Data for all classesAll dimensions are in inches. To view the Metric translation, click the Thread LinkClick icon to show Additional columnsClick icon to show Full Thread DataThreadBasic DiamTPIPitchPitch DiamThread HeightCres/ RootTap Drill SizeLead AngleMinor DiameterThread addendumseriesid#12 - 32 UNEF0.216320.03130.19570.01690.00780.18762.91°0.17880.0101Metric Values ➢Classes & Tolerances ➢UNEF231/4 - 32 UNEF0.25320.03130.22970.01690.00780.22162.48°0.21280.0101Metric Values ➢Classes & Tolerances ➢UNEF285/16 - 32 UNEF0.312320.03130.29170.01690.00780.28361.95°0.27480.0101Metric Values ➢Classes & Tolerances ➢UNEF343/8 - 32 UNEF0.375320.03130.35470.01690.00780.34661.61°0.33780.0101Metric Values ➢Classes & Tolerances ➢UNEF407/16 - 28 UNEF0.437280.03570.41380.01930.00890.40451.57°0.39450.0116Metric Values ➢Classes & Tolerances ➢UNEF471/2 - 28 UNEF0.5280.03570.47680.01930.00890.46751.37°0.45750.0116Metric Values ➢Classes & Tolerances ➢UNEF549/16 - 24 UNEF0.562240.04170.53490.02260.01040.52411.42°0.51240.0135Metric Values ➢Classes & Tolerances ➢UNEF615/8 - 24 UNEF0.625240.04170.59790.02260.01040.58711.27°0.57540.0135Metric Values ➢Classes & Tolerances ➢UNEF6911/16 - 24 UNEF0.687240.04170.65990.02260.01040.64911.15°0.63740.0135Metric Values ➢Classes & Tolerances ➢UNEF753/4 - 20 UNEF0.75200.05000.71750.02710.01250.70451.27°0.69050.0162Metric Values ➢Classes & Tolerances ➢UNEF8313/16 - 20 UNEF0.812200.05000.77950.02710.01250.76651.17°0.75250.0162Metric Values ➢Classes & Tolerances ➢UNEF897/8 - 20 UNEF0.875200.05000.84250.02710.01250.82951.08°0.81550.0162Metric Values ➢Classes & Tolerances ➢UNEF9715/16 - 20 UNEF0.937200.05000.90450.02710.01250.89151.01°0.87750.0162Metric Values ➢Classes & Tolerances ➢UNEF1031 - 20 UNEF1200.05000.96750.02710.01250.95450.94°0.94050.0162Metric Values ➢Classes & Tolerances ➢UNEF1111 1/16 - 18 UNEF1.062180.05561.02590.03010.01391.01140.99°0.99580.018Metric Values ➢Classes & Tolerances ➢UNEF1181 1/8 - 18 UNEF1.125180.05561.08890.03010.01391.07440.93°1.05880.018Metric Values ➢Classes & Tolerances ➢UNEF1261 3/16 - 18 UNEF1.187180.05561.15090.03010.01391.13640.88°1.12080.018Metric Values ➢Classes & Tolerances ➢UNEF1321 1/4 - 18 UNEF1.25180.05561.21390.03010.01391.19940.83°1.18380.018Metric Values ➢Classes & Tolerances ➢UNEF1401 5/16 - 18 UNEF1.312180.05561.27590.03010.01391.26140.79°1.24580.018Metric Values ➢Classes & Tolerances ➢UNEF1461 3/8 - 18 UNEF1.375180.05561.33890.03010.01391.32440.76°1.30880.018Metric Values ➢Classes & Tolerances ➢UNEF1541 7/16 - 18 UNEF1.437180.05561.40090.03010.01391.38640.72°1.37080.018Metric Values ➢Classes & Tolerances ➢UNEF1611 1/2 - 18 UNEF1.5180.05561.46390.03010.01391.44940.69°1.43380.018Metric Values ➢Classes & Tolerances ➢UNEF1701 9/16 - 18 UNEF1.562180.05561.52590.03010.01391.51140.66°1.49580.018Metric Values ➢Classes & Tolerances ➢UNEF1771 5/8 - 18 UNEF1.625180.05561.58890.03010.01391.57440.64°1.55880.018Metric Values ➢Classes & Tolerances ➢UNEF1831 11/16 - 18 UNEF1.687180.05561.65090.03010.01391.63640.61°1.62080.018Metric Values ➢Classes & Tolerances ➢UNEF189UN Constant Pitch Series Basic Dimensions chartClick the Thread Link to get the Full Thread Data for all classesAll dimensions are in inches. To view the Metric translation, click the Thread LinkClick icon to show Additional columnsClick icon to show Full Thread DataThreadBasic DiamTPIPitchPitch DiamThread HeightCres/ RootTap Drill SizeLead AngleMinor DiameterThread addendumseriesid9/16 - 12 12-UN0.562120.08330.50790.04510.02080.48622.99°0.46280.0271Metric Values ➢Classes & Tolerances ➢12-UN625/8 - 12 12-UN0.625120.08330.57090.04510.02080.54922.66°0.52580.0271Metric Values ➢Classes & Tolerances ➢12-UN7011/16 - 12 12-UN0.687120.08330.63290.04510.02080.61122.4°0.58780.0271Metric Values ➢Classes & Tolerances ➢12-UN763/4 - 12 12-UN0.75120.08330.69590.04510.02080.67422.18°0.65080.0271Metric Values ➢Classes & Tolerances ➢12-UN8413/16 - 12 12-UN0.812120.08330.75790.04510.02080.73622°0.71280.0271Metric Values ➢Classes & Tolerances ➢12-UN907/8 - 12 12-UN0.875120.08330.82090.04510.02080.79921.85°0.77580.0271Metric Values ➢Classes & Tolerances ➢12-UN9815/16 - 12 12-UN0.937120.08330.88290.04510.02080.86121.72°0.83780.0271Metric Values ➢Classes & Tolerances ➢12-UN1041 - 12 12-UN1120.08330.94590.04510.02080.92421.61°0.90080.0271Metric Values ➢Classes & Tolerances ➢12-UN1131 1/16 - 12 12-UN1.062120.08331.00790.04510.02080.98621.51°0.96280.0271Metric Values ➢Classes & Tolerances ➢12-UN1201 1/8 - 12 12-UN1.125120.08331.07090.04510.02081.04921.42°1.02580.0271Metric Values ➢Classes & Tolerances ➢12-UN1281 3/16 - 12 12-UN1.187120.08331.13290.04510.02081.11121.34°1.08780.0271Metric Values ➢Classes & Tolerances ➢12-UN1341 1/4 - 12 12-UN1.25120.08331.19590.04510.02081.17421.27°1.15080.0271Metric Values ➢Classes & Tolerances ➢12-UN1421 5/16 - 12 12-UN1.312120.08331.25790.04510.02081.23621.21°1.21280.0271Metric Values ➢Classes & Tolerances ➢12-UN1481 3/8 - 12 12-UN1.375120.08331.32090.04510.02081.29921.15°1.27580.0271Metric Values ➢Classes & Tolerances ➢12-UN1571 7/16 - 12 12-UN1.437120.08331.38290.04510.02081.36121.1°1.33780.0271Metric Values ➢Classes & Tolerances ➢12-UN1641 1/2 - 12 12-UN1.5120.08331.44590.04510.02081.42421.05°1.40080.0271Metric Values ➢Classes & Tolerances ➢12-UN1731 9/16 - 12 12-UN1.562120.08331.50790.04510.02081.48621.01°1.46280.0271Metric Values ➢Classes & Tolerances ➢12-UN1801 5/8 - 12 12-UN1.625120.08331.57090.04510.02081.54920.97°1.52580.0271Metric Values ➢Classes & Tolerances ➢12-UN1861 11/16 - 12 12-UN1.687120.08331.63290.04510.02081.61120.93°1.58780.0271Metric Values ➢Classes & Tolerances ➢12-UN1921 3/4 - 12 12-UN1.75120.08331.69590.04510.02081.67420.9°1.65080.0271Metric Values ➢Classes & Tolerances ➢12-UN1981 13/16 - 12 12-UN1.812120.08331.75790.04510.02081.73620.86°1.71280.0271Metric Values ➢Classes & Tolerances ➢12-UN2031 7/8 - 12 12-UN1.875120.08331.82090.04510.02081.79920.83°1.77580.0271Metric Values ➢Classes & Tolerances ➢12-UN2081 15/16 - 12 12-UN1.937120.08331.88290.04510.02081.86120.81°1.83780.0271Metric Values ➢Classes & Tolerances ➢12-UN2132 - 12 12-UN2120.08331.94590.04510.02081.92420.78°1.90080.0271Metric Values ➢Classes & Tolerances ➢12-UN2192 1/8 - 12 12-UN2.125120.08332.07090.04510.02082.04920.73°2.02580.0271Metric Values ➢Classes & Tolerances ➢12-UN2242 1/4 - 12 12-UN2.25120.08332.19590.04510.02082.17420.69°2.15080.0271Metric Values ➢Classes & Tolerances ➢12-UN2302 3/8 - 12 12-UN2.375120.08332.32090.04510.02082.29920.65°2.27580.0271Metric Values ➢Classes & Tolerances ➢12-UN2352 1/2 - 12 12-UN2.5120.08332.44590.04510.02082.42420.62°2.40080.0271Metric Values ➢Classes & Tolerances ➢12-UN2422 5/8 - 12 12-UN2.625120.08332.57090.04510.02082.54920.59°2.52580.0271Metric Values ➢Classes & Tolerances ➢12-UN2482 3/4 - 12 12-UN2.75120.08332.69590.04510.02082.67420.56°2.65080.0271Metric Values ➢Classes & Tolerances ➢12-UN2552 7/8 - 12 12-UN2.875120.08332.82090.04510.02082.79920.54°2.77580.0271Metric Values ➢Classes & Tolerances ➢12-UN2613 - 12 12-UN3120.08332.94590.04510.02082.92420.52°2.90080.0271Metric Values ➢Classes & Tolerances ➢12-UN2683 1/8 - 12 12-UN3.125120.08333.07090.04510.02083.04920.49°3.02580.0271Metric Values ➢Classes & Tolerances ➢12-UN2743 1/4 - 12 12-UN3.25120.08333.19590.04510.02083.17420.48°3.15080.0271Metric Values ➢Classes & Tolerances ➢12-UN2803 3/8 - 12 12-UN3.375120.08333.32090.04510.02083.29920.46°3.27580.0271Metric Values ➢Classes & Tolerances ➢12-UN2853 1/2 - 12 12-UN3.5120.08333.44590.04510.02083.42420.44°3.40080.0271Metric Values ➢Classes & Tolerances ➢12-UN2913 5/8 - 12 12-UN3.625120.08333.57090.04510.02083.54920.43°3.52580.0271Metric Values ➢Classes & Tolerances ➢12-UN2963 3/4 - 12 12-UN3.75120.08333.69590.04510.02083.67420.41°3.65080.0271Metric Values ➢Classes & Tolerances ➢12-UN3023 7/8 - 12 12-UN3.875120.08333.82090.04510.02083.79920.4°3.77580.0271Metric Values ➢Classes & Tolerances ➢12-UN3074 - 12 12-UN4120.08333.94590.04510.02083.92420.39°3.90080.0271Metric Values ➢Classes & Tolerances ➢12-UN3134 1/8 - 12 12-UN4.125120.08334.07090.04510.02084.04920.37°4.02580.0271Metric Values ➢Classes & Tolerances ➢12-UN3184 1/4 - 12 12-UN4.25120.08334.19590.04510.02084.17420.36°4.15080.0271Metric Values ➢Classes & Tolerances ➢12-UN3234 3/8 - 12 12-UN4.375120.08334.32090.04510.02084.29920.35°4.27580.0271Metric Values ➢Classes & Tolerances ➢12-UN3284 1/2 - 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32 32-UN0.75320.03130.72970.01690.00780.72160.78°0.71280.0101Metric Values ➢Classes & Tolerances ➢32-UN8813/16 - 32 32-UN0.812320.03130.79170.01690.00780.78360.72°0.77480.0101Metric Values ➢Classes & Tolerances ➢32-UN947/8 - 32 32-UN0.875320.03130.85470.01690.00780.84660.67°0.83780.0101Metric Values ➢Classes & Tolerances ➢32-UN10215/16 - 32 32-UN0.937320.03130.91670.01690.00780.90860.62°0.89980.0101Metric Values ➢Classes & Tolerances ➢32-UN1081 - 32 32-UN1320.03130.97970.01690.00780.97160.58°0.96280.0101Metric Values ➢Classes & Tolerances ➢32-UN1172 1/2 - 4 4-UN2.540.25002.33760.13530.06252.27251.95°2.20230.0812Metric Values ➢Classes & Tolerances ➢4-UN2392 5/8 - 4 4-UN2.62540.25002.46260.13530.06252.39751.85°2.32730.0812Metric Values ➢Classes & Tolerances ➢4-UN2452 3/4 - 4 4-UN2.7540.25002.58760.13530.06252.52251.76°2.45230.0812Metric Values ➢Classes & Tolerances ➢4-UN2522 7/8 - 4 4-UN2.87540.25002.71260.13530.06252.64751.68°2.57730.0812Metric Values ➢Classes & Tolerances ➢4-UN2583 - 4 4-UN340.25002.83760.13530.06252.77251.61°2.70230.0812Metric Values ➢Classes & Tolerances ➢4-UN2653 1/8 - 4 4-UN3.12540.25002.96260.13530.06252.89751.54°2.82730.0812Metric Values ➢Classes & Tolerances ➢4-UN2713 1/4 - 4 4-UN3.2540.25003.08760.13530.06253.02251.48°2.95230.0812Metric Values ➢Classes & Tolerances ➢4-UN2773 3/8 - 4 4-UN3.37540.25003.21260.13530.06253.14751.42°3.07730.0812Metric Values ➢Classes & Tolerances ➢4-UN2823 1/2 - 4 4-UN3.540.25003.33760.13530.06253.27251.37°3.20230.0812Metric Values ➢Classes & Tolerances ➢4-UN2883 5/8 - 4 4-UN3.62540.25003.46260.13530.06253.39751.32°3.32730.0812Metric Values ➢Classes & Tolerances ➢4-UN2933 3/4 - 4 4-UN3.7540.25003.58760.13530.06253.52251.27°3.45230.0812Metric Values ➢Classes & Tolerances ➢4-UN2993 7/8 - 4 4-UN3.87540.25003.71260.13530.06253.64751.23°3.57730.0812Metric Values ➢Classes & Tolerances ➢4-UN3044 - 4 4-UN440.25003.83760.13530.06253.77251.19°3.70230.0812Metric Values ➢Classes & Tolerances ➢4-UN3104 1/8 - 4 4-UN4.12540.25003.96260.13530.06253.89751.15°3.82730.0812Metric Values ➢Classes & Tolerances ➢4-UN3154 1/4 - 4 4-UN4.2540.25004.08760.13530.06254.02251.12°3.95230.0812Metric Values ➢Classes & Tolerances ➢4-UN3204 3/8 - 4 4-UN4.37540.25004.21260.13530.06254.14751.08°4.07730.0812Metric Values ➢Classes & Tolerances ➢4-UN3254 1/2 - 4 4-UN4.540.25004.33760.13530.06254.27251.05°4.20230.0812Metric Values ➢Classes & Tolerances ➢4-UN3304 5/8 - 4 4-UN4.62540.25004.46260.13530.06254.39751.02°4.32730.0812Metric Values ➢Classes & Tolerances ➢4-UN3354 3/4 - 4 4-UN4.7540.25004.58760.13530.06254.52250.99°4.45230.0812Metric Values ➢Classes & Tolerances ➢4-UN3414 7/8 - 4 4-UN4.87540.25004.71260.13530.06254.64750.97°4.57730.0812Metric Values ➢Classes & Tolerances ➢4-UN3465 - 4 4-UN540.25004.83760.13530.06254.77250.94°4.70230.0812Metric Values ➢Classes & Tolerances ➢4-UN3515 1/8 - 4 4-UN5.12540.25004.96260.13530.06254.89750.92°4.82730.0812Metric Values ➢Classes & Tolerances ➢4-UN3565 1/4 - 4 4-UN5.2540.25005.08760.13530.06255.02250.9°4.95230.0812Metric Values ➢Classes & Tolerances ➢4-UN3615 3/8 - 4 4-UN5.37540.25005.21260.13530.06255.14750.87°5.07730.0812Metric Values ➢Classes & Tolerances ➢4-UN3665 1/2 - 4 4-UN5.540.25005.33760.13530.06255.27250.85°5.20230.0812Metric Values ➢Classes & Tolerances ➢4-UN3715 5/8 - 4 4-UN5.62540.25005.46260.13530.06255.39750.83°5.32730.0812Metric Values ➢Classes & Tolerances ➢4-UN3765 3/4 - 4 4-UN5.7540.25005.58760.13530.06255.52250.82°5.45230.0812Metric Values ➢Classes & Tolerances ➢4-UN3815 7/8 - 4 4-UN5.87540.25005.71260.13530.06255.64750.8°5.57730.0812Metric Values ➢Classes & Tolerances ➢4-UN3866 - 4 4-UN640.25005.83760.13530.06255.77250.78°5.70230.0812Metric Values ➢Classes & Tolerances ➢4-UN3911 3/8 - 6 6-UN1.37560.16671.26670.09020.04171.22332.4°1.17650.0541Metric Values ➢Classes & Tolerances ➢6-UN1551 7/16 - 6 6-UN1.43760.16671.32870.09020.04171.28532.29°1.23850.0541Metric Values ➢Classes & Tolerances ➢6-UN1621 1/2 - 6 6-UN1.560.16671.39170.09020.04171.34832.18°1.30150.0541Metric Values ➢Classes & Tolerances ➢6-UN1711 9/16 - 6 6-UN1.56260.16671.45370.09020.04171.41032.09°1.36350.0541Metric Values ➢Classes & Tolerances ➢6-UN1781 5/8 - 6 6-UN1.62560.16671.51670.09020.04171.47332°1.42650.0541Metric Values ➢Classes & Tolerances ➢6-UN1841 11/16 - 6 6-UN1.68760.16671.57870.09020.04171.53531.92°1.48850.0541Metric Values ➢Classes & Tolerances ➢6-UN1901 3/4 - 6 6-UN1.7560.16671.64170.09020.04171.59831.85°1.55150.0541Metric Values ➢Classes & Tolerances ➢6-UN1961 13/16 - 6 6-UN1.81260.16671.70370.09020.04171.66031.78°1.61350.0541Metric Values ➢Classes & Tolerances ➢6-UN2011 7/8 - 6 6-UN1.87560.16671.76670.09020.04171.72331.72°1.67650.0541Metric Values ➢Classes & Tolerances ➢6-UN2061 15/16 - 6 6-UN1.93760.16671.82870.09020.04171.78531.66°1.73850.0541Metric Values ➢Classes & Tolerances ➢6-UN2112 - 6 6-UN260.16671.89170.09020.04171.84831.61°1.80150.0541Metric Values ➢Classes & Tolerances ➢6-UN2172 1/8 - 6 6-UN2.12560.16672.01670.09020.04171.97331.51°1.92650.0541Metric Values ➢Classes & Tolerances ➢6-UN2222 1/4 - 6 6-UN2.2560.16672.14170.09020.04172.09831.42°2.05150.0541Metric Values ➢Classes & Tolerances ➢6-UN2282 3/8 - 6 6-UN2.37560.16672.26670.09020.04172.22331.34°2.17650.0541Metric Values ➢Classes & Tolerances ➢6-UN2332 1/2 - 6 6-UN2.560.16672.39170.09020.04172.34831.27°2.30150.0541Metric Values ➢Classes & Tolerances ➢6-UN2402 5/8 - 6 6-UN2.62560.16672.51670.09020.04172.47331.21°2.42650.0541Metric Values ➢Classes & Tolerances ➢6-UN2462 3/4 - 6 6-UN2.7560.16672.64170.09020.04172.59831.15°2.55150.0541Metric Values ➢Classes & Tolerances ➢6-UN2532 7/8 - 6 6-UN2.87560.16672.76670.09020.04172.72331.1°2.67650.0541Metric Values ➢Classes & Tolerances ➢6-UN2593 - 6 6-UN360.16672.89170.09020.04172.84831.05°2.80150.0541Metric Values ➢Classes & Tolerances ➢6-UN2663 1/8 - 6 6-UN3.12560.16673.01670.09020.04172.97331.01°2.92650.0541Metric Values ➢Classes & Tolerances ➢6-UN2723 1/4 - 6 6-UN3.2560.16673.14170.09020.04173.09830.97°3.05150.0541Metric Values ➢Classes & Tolerances ➢6-UN2783 3/8 - 6 6-UN3.37560.16673.26670.09020.04173.22330.93°3.17650.0541Metric Values ➢Classes & Tolerances ➢6-UN2833 1/2 - 6 6-UN3.560.16673.39170.09020.04173.34830.9°3.30150.0541Metric Values ➢Classes & Tolerances ➢6-UN2893 5/8 - 6 6-UN3.62560.16673.51670.09020.04173.47330.86°3.42650.0541Metric Values ➢Classes & Tolerances ➢6-UN2943 3/4 - 6 6-UN3.7560.16673.64170.09020.04173.59830.83°3.55150.0541Metric Values ➢Classes & Tolerances ➢6-UN3003 7/8 - 6 6-UN3.87560.16673.76670.09020.04173.72330.81°3.67650.0541Metric Values ➢Classes & Tolerances ➢6-UN3054 - 6 6-UN460.16673.89170.09020.04173.84830.78°3.80150.0541Metric Values ➢Classes & Tolerances ➢6-UN3114 1/8 - 6 6-UN4.12560.16674.01670.09020.04173.97330.76°3.92650.0541Metric Values ➢Classes & Tolerances ➢6-UN3164 1/4 - 6 6-UN4.2560.16674.14170.09020.04174.09830.73°4.05150.0541Metric Values ➢Classes & Tolerances ➢6-UN3214 3/8 - 6 6-UN4.37560.16674.26670.09020.04174.22330.71°4.17650.0541Metric Values ➢Classes & Tolerances ➢6-UN3264 1/2 - 6 6-UN4.560.16674.39170.09020.04174.34830.69°4.30150.0541Metric Values ➢Classes & Tolerances ➢6-UN3314 5/8 - 6 6-UN4.62560.16674.51670.09020.04174.47330.67°4.42650.0541Metric Values ➢Classes & Tolerances ➢6-UN3364 3/4 - 6 6-UN4.7560.16674.64170.09020.04174.59830.65°4.55150.0541Metric Values ➢Classes & Tolerances ➢6-UN3424 7/8 - 6 6-UN4.87560.16674.76670.09020.04174.72330.64°4.67650.0541Metric Values ➢Classes & Tolerances ➢6-UN3475 - 6 6-UN560.16674.89170.09020.04174.84830.62°4.80150.0541Metric Values ➢Classes & Tolerances ➢6-UN3525 1/8 - 6 6-UN5.12560.16675.01670.09020.04174.97330.61°4.92650.0541Metric Values ➢Classes & Tolerances ➢6-UN3575 1/4 - 6 6-UN5.2560.16675.14170.09020.04175.09830.59°5.05150.0541Metric Values ➢Classes & Tolerances ➢6-UN3625 3/8 - 6 6-UN5.37560.16675.26670.09020.04175.22330.58°5.17650.0541Metric Values ➢Classes & Tolerances ➢6-UN3675 1/2 - 6 6-UN5.560.16675.39170.09020.04175.34830.56°5.30150.0541Metric Values ➢Classes & Tolerances ➢6-UN3725 5/8 - 6 6-UN5.62560.16675.51670.09020.04175.47330.55°5.42650.0541Metric Values ➢Classes & Tolerances ➢6-UN3775 3/4 - 6 6-UN5.7560.16675.64170.09020.04175.59830.54°5.55150.0541Metric Values ➢Classes & Tolerances ➢6-UN3825 7/8 - 6 6-UN5.87560.16675.76670.09020.04175.72330.53°5.67650.0541Metric Values ➢Classes & Tolerances ➢6-UN3876 - 6 6-UN660.16675.89170.09020.04175.84830.52°5.80150.0541Metric Values ➢Classes & Tolerances ➢6-UN3921 - 8 8-UN180.12500.91880.06770.03130.88632.48°0.85120.0406Metric Values ➢Classes & Tolerances ➢8-UN1121 1/16 - 8 8-UN1.06280.12500.98080.06770.03130.94832.32°0.91320.0406Metric Values ➢Classes & Tolerances ➢8-UN1191 1/8 - 8 8-UN1.12580.12501.04380.06770.03131.01132.18°0.97620.0406Metric Values ➢Classes & Tolerances ➢8-UN1271 3/16 - 8 8-UN1.18780.12501.10580.06770.03131.07332.06°1.03820.0406Metric Values ➢Classes & Tolerances ➢8-UN1331 1/4 - 8 8-UN1.2580.12501.16880.06770.03131.13631.95°1.10120.0406Metric Values ➢Classes & Tolerances ➢8-UN1411 5/16 - 8 8-UN1.31280.12501.23080.06770.03131.19831.85°1.16320.0406Metric Values ➢Classes & Tolerances ➢8-UN1471 3/8 - 8 8-UN1.37580.12501.29380.06770.03131.26131.76°1.22620.0406Metric Values ➢Classes & Tolerances ➢8-UN1561 7/16 - 8 8-UN1.43780.12501.35580.06770.03131.32331.68°1.28820.0406Metric Values ➢Classes & Tolerances ➢8-UN1631 1/2 - 8 8-UN1.580.12501.41880.06770.03131.38631.61°1.35120.0406Metric Values ➢Classes & Tolerances ➢8-UN1721 9/16 - 8 8-UN1.56280.12501.48080.06770.03131.44831.54°1.41320.0406Metric Values ➢Classes & Tolerances ➢8-UN1791 5/8 - 8 8-UN1.62580.12501.54380.06770.03131.51131.48°1.47620.0406Metric Values ➢Classes & Tolerances ➢8-UN1851 11/16 - 8 8-UN1.68780.12501.60580.06770.03131.57331.42°1.53820.0406Metric Values ➢Classes & Tolerances ➢8-UN1911 3/4 - 8 8-UN1.7580.12501.66880.06770.03131.63631.37°1.60120.0406Metric Values ➢Classes & Tolerances ➢8-UN1971 13/16 - 8 8-UN1.81280.12501.73080.06770.03131.69831.32°1.66320.0406Metric Values ➢Classes & Tolerances ➢8-UN2021 7/8 - 8 8-UN1.87580.12501.79380.06770.03131.76131.27°1.72620.0406Metric Values ➢Classes & Tolerances ➢8-UN2071 15/16 - 8 8-UN1.93780.12501.85580.06770.03131.82331.23°1.78820.0406Metric Values ➢Classes & Tolerances ➢8-UN2122 - 8 8-UN280.12501.91880.06770.03131.88631.19°1.85120.0406Metric Values ➢Classes & Tolerances ➢8-UN2182 1/8 - 8 8-UN2.12580.12502.04380.06770.03132.01131.12°1.97620.0406Metric Values ➢Classes & Tolerances ➢8-UN2232 1/4 - 8 8-UN2.2580.12502.16880.06770.03132.13631.05°2.10120.0406Metric Values ➢Classes & Tolerances ➢8-UN2292 3/8 - 8 8-UN2.37580.12502.29380.06770.03132.26130.99°2.22620.0406Metric Values ➢Classes & Tolerances ➢8-UN2342 1/2 - 8 8-UN2.580.12502.41880.06770.03132.38630.94°2.35120.0406Metric Values ➢Classes & Tolerances ➢8-UN2412 5/8 - 8 8-UN2.62580.12502.54380.06770.03132.51130.9°2.47620.0406Metric Values ➢Classes & Tolerances ➢8-UN2472 3/4 - 8 8-UN2.7580.12502.66880.06770.03132.63630.85°2.60120.0406Metric Values ➢Classes & Tolerances ➢8-UN2542 7/8 - 8 8-UN2.87580.12502.79380.06770.03132.76130.82°2.72620.0406Metric Values ➢Classes & Tolerances ➢8-UN2603 - 8 8-UN380.12502.91880.06770.03132.88630.78°2.85120.0406Metric Values ➢Classes & Tolerances ➢8-UN2673 1/8 - 8 8-UN3.12580.12503.04380.06770.03133.01130.75°2.97620.0406Metric Values ➢Classes & Tolerances ➢8-UN2733 1/4 - 8 8-UN3.2580.12503.16880.06770.03133.13630.72°3.10120.0406Metric Values ➢Classes & Tolerances ➢8-UN2793 3/8 - 8 8-UN3.37580.12503.29380.06770.03133.26130.69°3.22620.0406Metric Values ➢Classes & Tolerances ➢8-UN2843 1/2 - 8 8-UN3.580.12503.41880.06770.03133.38630.67°3.35120.0406Metric Values ➢Classes & Tolerances ➢8-UN2903 5/8 - 8 8-UN3.62580.12503.54380.06770.03133.51130.64°3.47620.0406Metric Values ➢Classes & Tolerances ➢8-UN2953 3/4 - 8 8-UN3.7580.12503.66880.06770.03133.63630.62°3.60120.0406Metric Values ➢Classes & Tolerances ➢8-UN3013 7/8 - 8 8-UN3.87580.12503.79380.06770.03133.76130.6°3.72620.0406Metric Values ➢Classes & Tolerances ➢8-UN3064 - 8 8-UN480.12503.91880.06770.03133.88630.58°3.85120.0406Metric Values ➢Classes & Tolerances ➢8-UN3124 1/8 - 8 8-UN4.12580.12504.04380.06770.03134.01130.56°3.97620.0406Metric Values ➢Classes & Tolerances ➢8-UN3174 1/4 - 8 8-UN4.2580.12504.16880.06770.03134.13630.55°4.10120.0406Metric Values ➢Classes & Tolerances ➢8-UN3224 3/8 - 8 8-UN4.37580.12504.29380.06770.03134.26130.53°4.22620.0406Metric Values ➢Classes & Tolerances ➢8-UN3274 1/2 - 8 8-UN4.580.12504.41880.06770.03134.38630.52°4.35120.0406Metric Values ➢Classes & Tolerances ➢8-UN3324 5/8 - 8 8-UN4.62580.12504.54380.06770.03134.51130.5°4.47620.0406Metric Values ➢Classes & Tolerances ➢8-UN3374 3/4 - 8 8-UN4.7580.12504.66880.06770.03134.63630.49°4.60120.0406Metric Values ➢Classes & Tolerances ➢8-UN3434 7/8 - 8 8-UN4.87580.12504.79380.06770.03134.76130.48°4.72620.0406Metric Values ➢Classes & Tolerances ➢8-UN3485 - 8 8-UN580.12504.91880.06770.03134.88630.46°4.85120.0406Metric Values ➢Classes & Tolerances ➢8-UN3535 1/8 - 8 8-UN5.12580.12505.04380.06770.03135.01130.45°4.97620.0406Metric Values ➢Classes & Tolerances ➢8-UN3585 1/4 - 8 8-UN5.2580.12505.16880.06770.03135.13630.44°5.10120.0406Metric Values ➢Classes & Tolerances ➢8-UN3635 3/8 - 8 8-UN5.37580.12505.29380.06770.03135.26130.43°5.22620.0406Metric Values ➢Classes & Tolerances ➢8-UN3685 1/2 - 8 8-UN5.580.12505.41880.06770.03135.38630.42°5.35120.0406Metric Values ➢Classes & Tolerances ➢8-UN3735 5/8 - 8 8-UN5.62580.12505.54380.06770.03135.51130.41°5.47620.0406Metric Values ➢Classes & Tolerances ➢8-UN3785 3/4 - 8 8-UN5.7580.12505.66880.06770.03135.63630.4°5.60120.0406Metric Values ➢Classes & Tolerances ➢8-UN3835 7/8 - 8 8-UN5.87580.12505.79380.06770.03135.76130.39°5.72620.0406Metric Values ➢Classes & Tolerances ➢8-UN3886 - 8 8-UN680.12505.91880.06770.03135.88630.39°5.85120.0406Metric Values ➢Classes & Tolerances ➢8-UN393limits of Thread Dimensions (UNC, UNF & UNEF)To manufacture or measure a thread, one has to know the maximum and minimum permissible values of the basic dimensions. These values are calculated according to the thread class (See below). To understand classes, you first need to understand the terms Allowance (Sometimes referred to as deviation) and Tolerances.Definition of terms:Allowance (Deviation): The minimum permissible distance between the basic and actual profile.Tolerance: The width of the tolerance field of a diameter on the actual thread profile. (Pitch, Major & Minor diameters)A small allowance means that the assembly of a male and female thread will be harder, but after assembly, there will be less freedom of movement.A large allowance means that the assembly of a male and female thread will be easier, but after assembly, there will be more freedom of movement.The allowance size does not influence a thread’s production difficulty or price.A wide tolerance is easier and cheaper to produce but yields a larger spread between threads.A narrow tolerance is challenging to produce and more expensive but yields a smaller spread between threads.Unified Thread ClassesThe class is defined by a two-character code.The first character defines is a digit between 1 and 3. 1=Loose fit, 2=Medium fit, and 3=Tight fit.The second character is a letter. A=External thread and B=Internal thread.In the Unified Inch thread system, only classes 1A & 2A have an allowance. The allowance for the two classes is the same.The other 4 classes have an allowance of Zero.All the internal thread profiles (B classes) have no allowance.Classes 1A & 1B: These classes are suitable for applications where a liberal tolerance and allowance are required to permit easy assembly. The maximum diameters of Class 1A threads are smaller than the basic diameter by the allowance amount. The minimum diameters of Class 1B threads are equal to the basic diameters and consequently afford no allowance at maximum material condition.Classes 2A & 2B: Classes 2A (external) and 2B (internal) are the default classes used for the commercial production of Nut, Bols, and otehr threaded fasteners. They are the default class unless otherwise specified. they have the same allowance as classes 1A/1B. However, they have a narrower tolerance field. The difficulty of assembly is the same, but the spread between different parts in a production batch is smaller.Classes 3A & 3B: These classes are suitable for applications where tight fit and accuracy of thread elements are essential. The maximum diameters of Class 3A threads and the minimum diameters of Class 3B threads are the same (Both have zero allowance). The accuracy is high, but the assembly is difficult.Combinations of Classes: The engineer can select any valid class for the male and female threads to achieve his design goals. The valid classes are defined in ASTM B1.1 as follows:Classes 2A, 2A, 3B, and 3B are always valid.Classes 1A & 1B are valid only for UNC threads with a nominal diameter equal to or larger than 1/4″.Unified Thread Allowance.The allowance es should be calculated for external threads with classes 1A and 2A. The allowance of both classes is the same and equals 0.3 times the pitch diameter tolerance of class 2A. It is the function of 3 parameters.D – Basic (nominal diameter)P – Pitch (1/TPI)LE – Length of engagement. If not explicitly specified, the length of engagement is assumed to be 5 pitches. (LE=5*P)All parameters are in inches$ \large es = 0.3 \times \left [ 0.0015 \times \sqrt[3]{D} + 0.0015 \times \sqrt{LE} + 0.015 \times \sqrt[3]{P^{2}} \right ] $\begin{array} \large \,es& = 0.3 \times\,[\,0.0015 \times \sqrt[3]{D} &\\ & +\,0.0015 \times \sqrt{LE}&\\ & + 0.015 \times \sqrt[3]{P^{2}}\,] \end{array}The result should be rounded to 6 decimal places.ASTM B1.1 lists in a long chart the allowance for each thread size. However, the results of this formula are 100% accurate, and there is no need to browse the chart.You can use our Advanced Threading Calculator to obtain the allowance according to a thread description or use the mini-calculator below.Unified Thread Allowance CalculatorPayment options Unified Thread TolerancesThe tolerances TD for internal threads and Td for external threads are derived from the class. The tolerances can be calculated according to the below formulas.Td – Tolerance for External Major DiameterTd2 – Tolerance for External Pitch DiameterTD1 – Tolerance for Internal Minor DiameterTD2 – Tolerance for Internal Pitch DiameterT – Base Tolerance (The tolerance of CLASS 2A pitch diameter is the base tolerance from which other tolerances are derived)D – Basic thread diameter.P – Pitch (1/TPI).LE – Length of engagement. (If unknown, the default is 5 * P)All input parameters and results are in Inches.Base Tolerance Formula$ \large T = 0.0015 \times \sqrt[3]{D} + 0.0015 \times \sqrt{LE} + 0.015 \times \sqrt[3]{P^{2}}$\begin{array} \large \,T& = \,0.0015 \times \sqrt[3]{D} &\\ & +\,0.0015 \times \sqrt{LE}&\\ & + 0.015 \times \sqrt[3]{P^{2}} \end{array}Formulas for External thread(Classes 1A,2A & 3A)$ \large T_{d(1A)} = 0.3 \times T $$ \large T_{d2(1A)} = 1.5 \times T $$ \large T_{d(2A)} = 0.06 \times \sqrt[3]{P^2} $$ \large T_{d2(2A)} = T $$ \large T_{d(3A)} = 0.06 \times \sqrt[3]{P^2} $$ \large T_{d2(3A)} = 0.75 \times T $Formulas for Internal Thread(Classes 1B,2B & 3B)$ \large T_{d1(1B)} = 0.25 \times P\,-\,0.4 \times P^{2} $$ \large T_{d2(1B)} = 1.95 \times T $$ \large T_{d1(2B)} = 0.25 \times P\,-\,0.4 \times P^{2} $$ \large T_{d2(2B)} = 1.30 \times T $$\begin{array}{ll} \large T_{d1(3B)}=&0.05 \times \sqrt[3]{P} + &\\ &0.003 \times \frac{P}{D}\,-\,0.002 \end{array} $$ \large T_{d2(3B)} = 0.975 \times T $The above formulas can be used in most cases. However, ASTM B1.1 lists various scenarios where other formulas or quirky rounding rules apply. Use our Advanced Threading Calculator to get exact results for any thread.Usage notes for the above formulas:The result should be rounded to 6 decimal places.Formulas for external threads are valid for all threads.Formulas for internal threads are valid only for thread diameters above 1/4″, a pitch between 4 and 80 TPI, and engagement lengths up to 1.5 X D.In some cases, ASTM B1.1 dictates special rounding rules.You can use the Threading Calculator, which automatically considers all the above rules.Unified Thread limits CalculationsOnce the Td, TD, & es values are known, the final limits can be calculated according to the formulas below.Formulas for Limits of a Unified Inch External Thread$ \large d_{max}=d-{es} $$ \large d_{min}=d_{max}-T_d $$ \large d_{2max} = d2 – es $$ \large d_{2min}=d_{2max}-T_{d2} $Formulas for Limits of a Unified Inch InternalThread$ \large D_{1min}=D $$ \large D_{1max}=D_{1min}+T_{D1} $$ \large D_{2minx} = D_2 $$ \large D_{2max}=D_{2min}+ T_{D2} $Related Glossary Terms:PitchThread Allowance (es)Major DiameterTooth per inch (tpi)Lead (Threading)Minor DiameterPitch DiameterFundamental TriangleThread Height (Depth)Thread addendumTap Drill SizeMaximum material condition (MMC)Length of Engagement

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Pitch:By default, the pitch is given in TPI. For example, 1/4-20 means a thread with a pitch of 20 TPI (1/20=0.05″).It is also allowed to denote the pitch by distance. For example, 1/4-0.05P means a thread with a pitch of 0.05″ (same as 20 TPI).Series:In most cases, the series will be UNC, UNF, or UNEF (Coarse, Fine, or Extra fine pitch).ASTM B1.1, also defines several constant pitch series. These are denoted by

* Easy access to all the data charts that appear on this pageList of SymbolsDesignation ExamplesPossible Diameter/Pitch combinations.UNC Series – Basic DimensionsUNF Series – Basic DimensionsUNEF Series – Basic DimensionsConstant Pitch Series – Basic DimensionsOverviewThe Unified Thread Standard (UTS) defines a 60° thread form in Inch dimensions as described in the ASME B1.1 standard. It is the North American equivalent of the ISO metric thread system. The UTS serves as the leading standard for bolts, nuts, and a wide variety of other threaded fasteners used in the USA and Canada. However, in recent years the metric thread standard is becoming more common.The standard defines diameter and pitch combinations along with allowances, tolerances, and designations. It has the same 60° profile as the ISO metric screw thread, but the basic dimensions of each UTS thread were chosen as an inch fraction rather than a millimeter value.DesignationBasic designation syntax:Nominal Diameter in Inch FractionPitch in TPISeries: UNC / UNF / UNEF / UNClass: 1A, 2A, 3A, 1B, 2B or 3B.Diameter:From 1/4″ and above the diameters are given in inch fractions. For example 1/4″, 3/4″, 1 1/4″.Below 1/4″ the diameters are given by a series of numbers from #0 to #12. Each “number” describes an arbitrary diameter as shown in the below table.It is also allowed to denote the diameters with a decimal value. For example 0.250 (1/4″), 0.4375 (7/16″), etc.Standard Diameter numbers below 1/4″DiameterNumber#0#1#2#3#4#5#6#8#10#12Diameter(Inch)0.060.0730.0860.0990.1120.1250.1380.1640.190.216Diameter(mm)1.5241.85422.18442.51462.84483.1753.50524.16564.82605.4864Pitch:By default, the pitch is given in TPI. For example, 1/4-20 means a thread with a pitch of 20 TPI (1/20=0.05″).It is also allowed to denote the pitch by distance. For example, 1/4-0.05P means a thread with a pitch of 0.05″ (same as 20 TPI).Series:In most cases, the series will be UNC, UNF, or UNEF (Coarse, Fine, or Extra fine pitch).ASTM B1.1, also defines several constant pitch series. These are denoted by