A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 5975-01-167-8598
NSN 5925-01-274-0277
NSN 6685-01-436-3475
NSN 5925-01-452-4493
NSN 5999-01-035-7465
NSN 5996-01-547-7386
NSN 5915-01-415-8987
NSN 6105-01-422-2292
NSN 5985-01-485-7341
NSN 5935-01-463-2200
NSN 6130-00-824-7120
NSN 5996-00-980-3858