A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 6240-00-187-4306
NSN 5835-01-201-6389
NSN 5910-00-156-7293
NSN 6145-01-617-6866
NSN 6130-01-176-3855
NSN 5835-01-128-9331
NSN 6220-01-508-6261
NSN 4140-00-857-3202
NSN 5915-00-810-0164
NSN 5999-01-203-6137
NSN 2925-01-283-3576
NSN 5915-00-607-7628