SAE AS8879 Rev D

Current Revision
Screw Threads - UNJ Profile, Inch Controlled Radius Root with Increased Minor Diameter

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Screw Threads - UNJ Profile, Inch Controlled Radius Root with Increased Minor Diameter

PUBLISH DATE 2024
PAGES 25

This SAE Aerospace Standard (AS) specifies the characteristics of screw threads - UNJ profile inch series, including a mandatory controlled radius as specified in Table 1 at the root of the external thread. The minor diameter of both external and internal threads provides a basic thread height of .5625H to accommodate the external thread maximum root radius.

The following detailed design requirements are included:

  • Screw threads - UNJ basic profile and design profiles.
  • Standard series of diameter-pitch combinations for nominal thread diameters from 0.060 to 6.000 inches.
  • Standard thread classes and form tolerances.
  • Formulae for thread dimensions and tolerances.
  • Method of designating UNJ threads.
  • Tables for selected diameter-pitch combinations for close tolerance mechanical thread applications.
  • Tables for screw thread - UNJ profile thread limit dimensions.
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