A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 5915-01-300-4900
NSN 5990-00-378-1449
NSN 5910-00-232-0655
NSN 2925-00-060-8292
NSN 5985-01-418-1999
NSN 6610-00-526-9440
NSN 5960-01-057-4058
NSN 6130-00-614-9961
NSN 6110-01-429-8668
NSN 5975-00-719-9793
NSN 5975-00-732-7911
NSN 7035-01-226-2545