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:
UNJ basic profile and design profiles.
Standard series of diameter-pitch combinations for nominal thread diameters from .060 to 6.000 inches.
Standard thread classes and form tolerances.
Formulae for thread dimensions and tolerances.
Method of designating UNJ threads.
Acceptance and verification requirements.
Tables for selected diameter-pitch combinations for aerospace screws, bolts, nuts, shaft and bearing retaining screw threads, fluid fittings, and other component thread sizes.
Tables for UNJ screw threads limiting dimensions and tolerances.