A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 5996-01-036-2497
NSN 6650-01-187-0205
NSN 6240-00-594-7138
NSN 5930-01-486-5850
NSN 6320-01-616-0843
NSN 6240-01-369-0069
NSN 6320-01-116-3980
NSN 6320-01-495-0512
NSN 5930-01-437-7668
NSN 6685-01-559-1638
NSN 5960-00-675-3439
NSN 5950-01-540-9939