A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 5975-00-814-9263
NSN 6150-01-348-8970
NSN 5965-00-153-5216
NSN 5975-01-370-2100
NSN 6150-01-563-7557
NSN 6105-01-634-0322
NSN 5975-01-235-3889
NSN 6610-01-357-5957
NSN 6105-01-155-4041
NSN 4140-01-093-8110
NSN 5999-01-409-2834
NSN 5835-01-631-7390