AS8879B Screw Threads - UNJ Profile, Inch

Revised

08/01/2001

Features
Issuing Committee
Scope
Content
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.
Meta TagsDetails
DOI
https://doi.org/10.4271/AS8879B
Pages
33
Citation
SAE International Technical Standard, Screw Threads - UNJ Profile, Inch, SAE Standard AS8879B, Revised August 2001, Issued October 1996, https://doi.org/10.4271/AS8879B.
Additional Details
Publisher
Published
Aug 1, 2001
Product Code
AS8879B
Content Type
Technical Standard
Status
Revised
Language
English

Revisions