A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 7035-01-027-1718
NSN 5895-01-381-1976
NSN 6610-00-232-9485
NSN 5930-01-546-1023
NSN 7035-01-067-4809
NSN 5925-01-401-5314
NSN 6645-01-252-8870
NSN 6685-00-012-3734
NSN 5920-00-398-0766
NSN 6220-01-471-5430
NSN 5930-01-383-8119
NSN 5998-01-279-3567