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Specification Notes and changes


THREAD GAGE MIL-S-8879 As it relates to SAE-AS8879


MIL-S-8879 Notice 3 dated 24 February 2003 states that Military Specification: MIL-S-8879C General Specification for Screw Threads with Controlled Radius Root and Increased Minor Diameter dated 25 July 1991, and Amendment 1 dated 2 September 1992 are hereby canceled. The MIL-S-8879 is superseded by the Society of Automotive Engineers (SAE) Aerospace Specification number AS8879.
Threads identified as Application Category "Other Thread" in MIL-S-8879 are identified as "Category 1" threads in AS8879.
Threads identified as Application Category "Safety Critical Thread" in MIL-S-8879 are identified as "Category 2" threads in AS8879.

The FAA Advisory Circular AC No.:21-41A dated 6 June 2003 informs, clarifies and guides the civil aviation industry on using the SAE AS8879 instead of the MIL-S-8879.

The DoD Adoption Notice for SAE-AS8879 states that SAE-AS8879, "Screw Threads - UNJ Profile, Inch Controlled Radius Root with Increased Minor Diameter", was adopted on 14-MAY-03 for use by the Department of Defense (DoD).

Copies of SAE-AS8879 may be purchased from:
Society of Automotive Engineers Inc
400 Commonwealth Dr
Warrendale, PA 15096-0001
Tel: 877-606-7323 (Inside USA & Canada)
Tel: 724-776-4970 (Outside USA)
Order a copy online:

For a summary of the standard as it relates to thread gages see UNJ vs. UN.



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NOTICE: All information provided on this reference sheet is intended to be for general guidelines and may not represent the full specifications or instructions as outlined within ASME requirements or other technical specifications which govern the manufacturing and use of thread measuring gages. thegagestore.com/LEECO INC, does not represent this information as anything except a common sense general set of guidelines. You must always follow the technical specifications relative to the gage, thread design or other related gage attributes and usage that apply. When in doubt always acquire the current specification from http://www.asme.org/ codes & standards.


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