A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 5920-01-252-8660
NSN 5935-00-833-1259
NSN 6240-00-753-7586
NSN 6650-01-015-2604
NSN 6105-00-412-2058
NSN 5905-01-586-2800
NSN 5920-01-031-1034
NSN 5999-01-122-9192
NSN 5960-01-495-0859
NSN 4140-01-482-2053
NSN 5905-01-192-9101
NSN 5905-00-636-5420