A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 5910-00-450-5418
NSN 6110-01-382-9706
NSN 5895-01-587-8342
NSN 5910-00-752-4296
NSN 2925-01-424-0235
NSN 5905-01-219-3094
NSN 6320-01-185-3857
NSN 6685-01-524-1997
NSN 5910-00-590-2522
NSN 4140-01-608-4073
NSN 5935-01-597-3582
NSN 6105-00-553-5161