A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 6105-00-643-4975
NSN 5905-00-351-8087
NSN 5998-00-827-0527
NSN 4140-01-346-5557
NSN 6220-01-352-5425
NSN 4140-01-288-0764
NSN 5895-00-166-0962
NSN 2925-01-575-1505
NSN 6610-01-324-7017
NSN 5960-01-241-1844
NSN 5996-00-304-8196
NSN 5910-01-178-6770