A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 5960-01-609-6565
NSN 5975-01-286-3294
NSN 5945-00-836-6395
NSN 6105-01-582-3542
NSN 6130-01-474-5190
NSN 5905-01-386-4483
NSN 5930-00-152-5123
NSN 5930-01-251-0964
NSN 5935-00-900-1132
NSN 6610-01-627-8985
NSN 5945-00-284-3146
NSN 5999-00-554-4285