A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 5960-01-061-9166
NSN 5985-01-535-9826
NSN 2925-01-283-3576
NSN 6240-01-159-5043
NSN 7035-01-344-8708
NSN 5990-01-317-9297
NSN 5835-00-016-3671
NSN 5985-01-167-4670
NSN 5905-00-275-1124
NSN 5999-00-703-2008
NSN 5835-00-170-5238
NSN 7035-01-131-1168