A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 5930-01-384-5740
NSN 6130-00-122-0103
NSN 5925-01-174-0335
NSN 5835-00-083-6557
NSN 5935-01-384-2106
NSN 2925-00-391-0331
NSN 5910-00-416-9775
NSN 5975-00-997-0749
NSN 5930-00-362-6737
NSN 6130-01-515-9956
NSN 6105-00-286-5382
NSN 6105-01-176-5708