A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 5996-01-421-9391
NSN 6645-01-317-6071
NSN 5945-00-529-0409
NSN 2925-00-824-2186
NSN 6650-01-067-8946
NSN 6130-00-007-9743
NSN 5975-01-463-3173
NSN 4140-01-619-6859
NSN 6105-01-659-6011
NSN 5930-01-485-9610
NSN 6110-01-087-7695
NSN 6650-00-269-5000