A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 5985-01-056-6392
NSN 5996-01-167-8914
NSN 5895-01-554-4270
NSN 5855-01-364-1005
NSN 5920-01-518-5670
NSN 6610-00-482-2265
NSN 5855-01-549-9266
NSN 5925-00-363-9578
NSN 6105-01-214-1631
NSN 6240-01-606-9549
NSN 5925-00-666-4753
NSN 5990-01-004-6343