SAE MA1370A PDF
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Screw Threads – MJ Profile, Metric(STABILIZED Apr 2024)
Description
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
History
| MA1370A | 2024-04-01 | Latest | Stabilized |
| MA1370 | 2018-08-23 | Historical | Reaffirmed |
| ISSUING COMMITTEE | E-25 General Standards for Aerospace and Propulsion Systems |
|---|---|
| DATE | 2024-04-01 |
| DOI | |
| ISCURRENT | Current |
| PAGE | 39 |
| PUBLISHER | SAE International |
| REVISED | STABILIZED |
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