A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 5930-01-216-5512
NSN 6110-01-552-1171
NSN 5935-00-787-3583
NSN 5960-00-116-9989
NSN 5975-01-215-1205
NSN 5945-00-557-4996
NSN 6645-01-341-5439
NSN 4140-00-674-2856
NSN 5915-01-144-7696
NSN 5996-01-126-3885
NSN 5945-01-578-1188
NSN 5935-01-328-5865