Note : ** 6H is normally selected for commercial internal (nut) threads. Use this tolerance class for commercial internal threads. For usage of the other classes, refer to ISO 965-1:1998.

Feb 22, 2024 — Metric thread classes · For e position: e s = − ( 50 + 11 × P ) / 1000 \small{es = -(50 + 11 \times P) / 1000} es=−(50+11×P)/1000; · For f ...

Metric thread calculator to calculate external and internal metric thread dimensions including major diameter, minor diameter, pitch diameter and thread tolerance according to ISO 724 and ISO 965 standards.

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- If the two class designations for the pitch diameter and crest diameter are the same it is not necessary to repeat the symbols. (M10 x 1 6g)

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ISO Hole Tolerances for chart given below shows range between 400mm to 3150mm. ... H8, +97 0, +110 0, +125 0, +140 0, +165 0, +195 0, +230 0, + 280 0, +330 0. H9 ...

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Minor Diameter: The minimum diameter of a thread which is diameter of the root of a male thread or crest of a female thread.

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In general engineering use, calculations can be done by selecting a standard metric thread size in a range from 1.6 mm (M1.6) to 64 mm (M64). Tolerance class can be selected among the alternatives 6e, 6f, 6g and 4h for bolts and 5H, 6H, 7H and 6G for nuts. 6g and 6H are default values and selected class for commercial external threads and internal threads in ISO 965-1:1998. The user shall use 6g for bolts and 6H for nuts unless there is a specific requirement to use other tolerance classes.

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Major Diameter: The maximum diameter of a thread which is diameter of the crest of a male thread or root of a female thread.

Basic profile: The theoretical profile of a screw thread in an axial plane defined by theoretical dimensions and angles common to internal and external threads

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Note : * 6g is normally selected for commercial external (bolt) threads. Use this tolerance class for commercial external (bolt) threads. For usage of the other classes, refer to ISO 965-1:1998.

In custom use, thread size, pitch and tolerance classes can be independently selected for custom metric thread dimensions calculations.

- External Screw Thread Designation: Nominal Diameter x Pitch - Tolerance class for pitch diameter - Tolerance class for major diameter (M10 x 1 5g 6g)

Note-1: For coated threads, the tolerances apply to the parts before coating, unless otherwise stated. After coating, the actual thread profile shall not at any point transgress the maximum material limits for positions h or H. For external (bolt) threads; The actual root contours shall not at any point transgress the basic profile. Fasteners of property class 8.8 and higher (see ISO 898-1), the root profile shall have a non-reversing curvature, no portion of which shall have a radius of less than Rmin.

Gauges and Gauging: Details for the manufacture and use of gauges for checking ISO general-purpose metric screw threads are specified in the ISO 1502:1996 standard. It specifies the features of the types of gauges (Solid/adjustable GO screw ring gauges, check plugs, setting plugs, wear check plugs, screw caliper gauges, plug gauges, etc.) which are recommended for checking external and internal screw threads of workplaces and for the setting and checking of certain of the screw gauges.

- Internal Screw Thread Designation: – Nominal Diameter x Pitch - Tolerance class for pitch diameter - Tolerance class for minor diameter (M10 x 1 5H 6H)

- The list of metric screw thread used in general engineering applications are given in the General Purpose Metric Screw Threads Table.