Internalthread reliefchart

Maximum rounded form minor diameter = d3max =  d2max - (0.5H + 2rmin (1 − cos (60deg − arccos(1 − Td2/ 4rmin)))). Here, rmin is minimum root radius, Td2 is pitch diameter tolerance and H is height of sharp V-thread.

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Threads produced to ASME B1.13M standard are fully interchangeable with threads that are based on ISO 68-1 basic profile and ISO 965-1 tolerance practices.

Externalthread reliefchart

Note-1: Maximum rounded form minor diameter is calculated with following formula. The rest of the dimensions are tabulated values from the ASME standard.

Metric external thread dimensions are given in the external thread chart below according to ASME B1.13M standard. Thread pitch diameter, major diameter and minor diameter for M profile external threads are given. All dimensions are in millimeters.

Thread reliefchart

Size limits for standard external thread tolerance classes 6g and 4g6g apply prior to coating. The external thread allowance may thus be used to accommodate the coating thickness on coated parts.

The designation of a screw thread gives the thread symbol, the nominal size, the pitch, and the thread tolerance class (Ex: M6 x 1 - 4g6g). In tolerance class designation, the pitch diameter tolerance is followed by major diameter tolerance. If the two class designations for the pitch diameter and major diameter are same, it is not necessary to repeat the symbols. (Ex: M6 x 1 - 6g)

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