A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 5920-00-593-6496
NSN 6135-01-074-8220
NSN 5930-00-633-8008
NSN 5895-01-246-4250
NSN 5990-00-440-6532
NSN 6105-01-170-4528
NSN 5998-01-206-4672
NSN 5905-00-910-4002
NSN 5930-01-185-4437
NSN 5895-01-054-1437
NSN 7035-01-146-1578
NSN 5915-00-036-6680