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This paper was prepared to support supersession of MIL-S-8879C with Screw Thread Conformity Task Force selected industry standard AS8879C, published by the Society of Automotive Engineers (SAE). Other documentation changes will be covered by separate papers. Separate papers are anticipated for thread gaging issues, and thread gage calibration procedures. The STC-TF decided that the thread design standard needed to be completed before thread gage definition could be addressed. Thread gage definition has to be known before calibration procedures can be addressed.

This procurement specification covers plain helical lock washers fabricated from heat treated carbon steel.

This document addresses AS8879 thread inspection issues relating to selection, usage and capability of gages. It addresses the selection of calibrated measurement gages, the need for defined quality metrics, the methodology of determining the appropriate guardband factors, and the minimum inspection requirements for single element pitch diameter gages. Users of this document shall apply the information described herein for the evaluation of the capability of their measurements based on the measurement consumer risk. It involves the analysis of the measurement (product) distribution and biases of both the product and measurement system distributions. It protects the consumer from the worst case distribution results. A whitepaper has been developed to provide supporting documentation and the rationale used in the development of this standard. This whitepaper will be published by the SAE as an Aerospace Information Report (AIR6553).

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.

This specification covers the requirements for format and outline of contents of operating instructions in published form or in manuscript form suitable for publication.

This specification covers the requirements for format and outline of contents of operating instructions in published form or in manuscript form suitable for publication.

This specification covers the requirements for format and outline of contents of operating instructions in published form or in manuscript form suitable for publication.

This specification covers the requirements for the preparation of Operating Instructions in published form or in manuscript form suitable for publication as designated herein.

This specification covers standard requirements for reciprocating aircraft engines.

This specification covers standard requirements for reciprocating aircraft engines.