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SAE MA 1370A-2024

Screw Threads - MJ Profile, Metric

This standard specifies the characteristics of the MJ profile metric series of screw threads, altered from ISO 68 M Profile, to include a mandatory controlled radius of 0.18042P to 0.15011P at the root of the external thread and with the minor diameter of both external and internal threads increased to provide a basic thread height of 0.5625H in order to accommodate the external thread maximum root radius. The following detailed requirements are included:       a   MJ basic profile and design profiles     b   Standard series of diameter-pitch combinations for nominal thread diameters from 1.6 to 200 mm     c   Standard thread classes and form tolerances     d   Formulae for thread dimensions and tolerances     e   Method of designating MJ threads     f   Inspection requirement     g   Tables for selected diameter-pitch combinations for aerospace screws, bolts, nuts, shaft and bearing retaining screw threads, and fluid fittings thread sizes     h   Tables for MJ screw threads limiting dimensions and tolerances     i   Symbols for MJ thread dimensions and tolerances

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Society of Automotive Engineers [sae]

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