A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 5915-01-581-3145
NSN 5945-00-310-1477
NSN 6130-00-244-1406
NSN 7035-01-220-6392
NSN 7035-01-192-2659
NSN 6110-01-013-9313
NSN 6240-01-618-4065
NSN 5835-01-141-4707
NSN 6220-01-526-5081
NSN 5915-00-987-1855
NSN 6105-01-167-7944
NSN 6110-00-596-6644