A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 6145-01-196-0496
NSN 6135-01-400-2947
NSN 5925-01-494-0085
NSN 6240-01-374-8868
NSN 6145-00-466-4068
NSN 5910-01-434-2550
NSN 2925-01-298-2674
NSN 5835-01-550-1577
NSN 6220-00-156-0860
NSN 4140-00-259-2567
NSN 6110-00-984-4273
NSN 5950-00-822-5704