A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 5855-01-306-5655
NSN 5925-01-421-4276
NSN 5925-00-792-9073
NSN 7035-01-024-9511
NSN 6145-01-243-0123
NSN 6240-01-242-7733
NSN 5895-01-557-3383
NSN 5999-00-625-5597
NSN 4140-01-246-3090
NSN 6610-01-338-6272
NSN 5915-00-857-3007
NSN 7035-01-473-3223