A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 5930-00-869-9114
NSN 5975-01-267-6459
NSN 5910-01-512-1978
NSN 5905-01-555-8077
NSN 2925-01-599-1901
NSN 6110-01-364-2145
NSN 6240-00-614-9679
NSN 5930-01-013-6914
NSN 6240-00-266-6258
NSN 5855-01-658-4510
NSN 5990-01-359-8334
NSN 6220-01-358-5134