Browse Standards MA1370
Current REAFFIRMED 2018-08-23

Screw Threads - MJ Profile, Metric MA1370

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:
  1. a
    MJ basic profile and design profiles
  2. b
    Standard series of diameter-pitch combinations for nominal thread diameters from 1.6 to 200 mm
  3. c
    Standard thread classes and form tolerances
  4. d
    Formulae for thread dimensions and tolerances
  5. e
    Method of designating MJ threads
  6. f
    Inspection requirement
  7. g
    Tables for selected diameter-pitch combinations for aerospace screws, bolts, nuts, shaft and bearing retaining screw threads, and fluid fittings thread sizes
  8. h
    Tables for MJ screw threads limiting dimensions and tolerances
  9. i
    Symbols for MJ thread dimensions and tolerances


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