A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 5915-01-471-7814
NSN 6130-01-554-5408
NSN 2925-01-458-5808
NSN 5999-00-212-7853
NSN 5925-01-159-7595
NSN 4140-01-593-8785
NSN 5855-00-228-8446
NSN 5990-01-123-4226
NSN 7035-01-555-8793
NSN 5855-01-287-6391
NSN 5935-00-655-4427
NSN 6610-01-285-4673