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Standard

SAE AS8879

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Abstract

This SAE Aerospace Standard (AS) specifies the characteristics of the UNJ profile inch series of screw threads, to include a mandatory controlled radius of 0.18042P to 0.15011P at the root of the external thread and with the 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: a UNJ basic profile and design profiles. b Standard series of diameter-pitch combinations for nominal thread diameters from .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 Inspection and verification requirements. 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. h Tables for UNJ screw threads limiting dimensions and tolerances. i Symbols for UNJ thread dimensions and tolerances.

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  • Standard from SAE International
  • Published:
  • Withdrawn:
  • Document type: IS
  • Pages
  • Publisher: SAE International
  • Distributor: SAE International

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