This standard BS EN 3729:2008 Aerospace series. Rings, threaded, self-locking, left-hand thread, in heat resisting steel FE-PA92HT (A286), silver plated is classified in these ICS categories:
49.030.99 Other fasteners
This standard specifies the characteristics of threaded, self-locking rings, with left-hand threads, in FE PA92HT, silver plated, chiefly used for axial location of bearing outer rings. Maximum test temperature of the parts: 450 °C. NOTE These parts are designed to be used with 4H6H internal threads.