AS-8879 › 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
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: a. Screw threads - UNJ basic profile and design profiles. b. Standard series of diameter-pitch combinations for nominal thread diameters from 0.060 to 6.000 inches. c. Standard thread classes and form tolerances. d. Formulae for thread dimensions and tolerances. e. Method of designating UNJ threads. f. Tables for selected diameter-pitch combinations for close tolerance mechanical thread applications. g. Tables for screw thread - UNJ profile thread limit dimensions.
The document was reviews in November 2012 and was reaffirmed at that time (no changes made to the 2004 edition with the exception of the addition of the reaffirmation date on the cover).
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REVISION D R18
Aug. 23, 2018