A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 5960-01-300-6788
NSN 2925-00-371-2285
NSN 7035-00-206-6123
NSN 5935-01-442-6139
NSN 5925-01-495-1071
NSN 5975-01-210-0695
NSN 5985-00-788-6962
NSN 5935-01-421-1802
NSN 5960-01-274-7628
NSN 5945-00-523-5215
NSN 5915-01-145-2148
NSN 5915-00-239-5263