A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 6610-01-136-4866
NSN 5835-00-484-1330
NSN 5855-01-610-1766
NSN 5895-01-206-9316
NSN 5895-01-519-9373
NSN 4140-01-236-2175
NSN 6130-01-235-3787
NSN 5855-01-653-4319
NSN 6685-01-004-6182
NSN 5950-01-546-6251
NSN 6320-01-476-5145
NSN 5945-00-484-4567