A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 5960-00-045-5317
NSN 6320-00-322-3460
NSN 5910-01-319-8411
NSN 5910-01-050-4244
NSN 6650-00-264-0664
NSN 5925-01-200-5742
NSN 6150-00-849-6146
NSN 2925-01-211-3294
NSN 5905-01-141-4565
NSN 5835-01-457-7951
NSN 6145-00-115-1845
NSN 6150-00-756-6118