A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 6150-01-050-8268
NSN 6135-01-461-6521
NSN 5895-01-107-3173
NSN 5998-01-646-0208
NSN 5990-01-351-4621
NSN 6135-01-462-6040
NSN 6105-00-917-2254
NSN 4140-01-180-8343
NSN 5920-01-013-5780
NSN 5990-00-928-2261
NSN 5915-01-248-8581
NSN 6620-01-348-1893