A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 5920-01-448-9208
NSN 5975-01-576-8301
NSN 6320-00-070-4544
NSN 5935-01-096-7626
NSN 6685-00-203-4485
NSN 5935-01-202-8231
NSN 2925-01-519-3221
NSN 5835-01-141-8823
NSN 6320-01-511-1526
NSN 6645-00-808-1407
NSN 5945-00-475-8107
NSN 6145-00-177-4731