Browse Standards AS8879C
Historical REVISED 2003-01-15

Screw Threads - UNJ Profile, Inch Controlled Radius Root with Increased Minor Diameter AS8879C

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:
  1. a
    Screw threads - UNJ basic profile and design profiles.
  2. b
    Standard series of diameter-pitch combinations for nominal thread diameters from 0.060 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
    Tables for selected diameter-pitch combinations for close tolerance mechanical thread applications.
  7. g
    Tables for screw thread - UNJ profile thread limit dimensions.
AS8879D
2018-08-23
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

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