A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 5990-01-356-4259
NSN 6145-00-243-8466
NSN 5905-01-472-2366
NSN 7035-01-506-6705
NSN 5835-01-216-7289
NSN 5935-00-777-0511
NSN 2925-00-233-5644
NSN 6105-01-065-6660
NSN 6220-01-009-6157
NSN 6645-01-298-4662
NSN 6220-01-475-6373
NSN 5990-01-591-0701