A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 6145-01-653-4273
NSN 6610-00-588-7649
NSN 6150-00-392-6831
NSN 5935-00-236-3518
NSN 6610-00-058-9527
NSN 5925-01-285-0362
NSN 4140-00-354-4117
NSN 6135-00-309-0074
NSN 6610-00-567-9385
NSN 5910-01-414-1159
NSN 5920-01-254-2267
NSN 6130-01-409-2867