A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 5975-01-069-3236
NSN 5965-01-241-0553
NSN 5985-00-156-9287
NSN 5920-01-243-0611
NSN 5975-00-004-9431
NSN 6135-01-282-4326
NSN 5905-01-331-5778
NSN 6645-00-616-1289
NSN 6150-01-091-3662
NSN 6110-00-771-4538
NSN 5965-00-239-3471
NSN 5965-01-535-5789