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:

1. a UNJ basic profile and design profiles.
2. b Standard series of diameter-pitch combinations for nominal thread diameters from .060 to 6.000 inches.
3. c Standard thread classes and form tolerances.
4. d Formulae for thread dimensions and tolerances.
5. e Method of designating UNJ threads.
6. f Acceptance and verification requirement,s.
7. 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.
8. h Tables for UNJ screw threads limiting dimensions and tolerances.
9. i Symbols for UNJ thread dimensions and tolerances.