SAE Standards Works
E-25 General Standards for Aerospace and Propulsion Systems
AS1908 - Threads, Internal profile, Preload-Locking, Specification For
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Threads, Internal profile, Preload-Locking, Specification For
This specification defines dimensional requirements for internet, preload-locking threads. The threads are designed to mate with external threads conforming to UN or UNJ Thread forms with class 2A or 3A tolerances
The E-25 Committee at the 228th meeting decided to revive this project started in the 1980's but abandoned due to concerns of potetial patent infringements. Patents have long since run out and parts having this thread form are being produced on a regular basis.