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SAE MA1370 Rev A

Screw Threads - MJ Profile, Metric
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SAE MA1370 Rev A

Screw Threads - MJ Profile, Metric

PUBLISH DATE 2024
SAE MA1370 Rev A

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:

  • MJ basic profile and design profiles
  • Standard series of diameter-pitch combinations for nominal thread diameters from 1.6 to 200 mm
  • Standard thread classes and form tolerances
  • Formulae for thread dimensions and tolerances
  • Method of designating MJ threads
  • Inspection requirement
  • Tables for selected diameter-pitch combinations for aerospace screws, bolts, nuts, shaft and bearing retaining screw threads, and fluid fittings thread sizes
  • Tables for MJ screw threads limiting dimensions and tolerances
  • Symbols for MJ thread dimensions and tolerances
SDO SAE: SAE International
Document Number MA1370
Publication Date April 1, 2024
Language en - English
Page Count 39
Revision Level A
Supercedes
Committee
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