SAE AS8879A PDF
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Screw Threads – UNJ Profile, Inch
Description
This SAE Aerospace Standard (AS) specifies the characteristics of the UNJ profile inch series of screw threads, to include a mandatory controlled radius of 0.18142P to 0.15011P at the root of the external thread and with a 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
UNJ basic profile and design profiles.
b
Standard series of diameter-pitch combinations for nominal thread diameters from .060 to 6.000 inches.
c
Standard thread classes and form tolerances.
d
Formulae for thread dimensions and tolerances.
e
Method of designating UNJ threads.
f
Acceptance and verification requirements.
g
Tables for selected diameter-pitch combinations for aerospace screws, bolts, nuts, shaft and bearing retaining screw threads, fluid fittings, and other component thread sizes.
h
Tables for UNJ screw threads limiting dimensions and tolerances.
i
Symbols for UNJ thread dimensions and tolerances.
History
| AS8879D | 2024-04-05 | Latest | Reaffirmed |
| AS8879C | 2003-01-15 | Historical | Revised |
| AS8879B | 2001-08-01 | Historical | Revised |
| AS8879A | 1999-01-01 | Historical | Issued |
| AS8879 | 1996-10-01 | Historical | Issued |
| ISSUING COMMITTEE | E-25 General Standards for Aerospace and Propulsion Systems |
|---|---|
| DATE | 1999-01-01 |
| DOI | |
| ISCURRENT | |
| PAGE | 33 |
| PUBLISHER | SAE International |
| REVISED | REVISED |
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