A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 5905-01-013-9558
NSN 6650-01-326-1521
NSN 5935-00-209-0923
NSN 5925-01-570-9773
NSN 6650-01-237-4689
NSN 5945-00-484-1233
NSN 5905-01-124-9615
NSN 5930-01-227-3768
NSN 4140-00-490-9028
NSN 5945-01-170-6666
NSN 5910-01-435-5531
NSN 5855-00-466-2309