A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 5965-01-574-4938
NSN 5965-01-422-9770
NSN 6145-00-033-2997
NSN 5915-01-284-8905
NSN 6685-01-305-5883
NSN 6130-00-276-0658
NSN 5996-01-514-8118
NSN 6620-00-877-3266
NSN 5910-01-413-8830
NSN 4140-00-797-7765
NSN 5935-01-123-7878
NSN 6145-00-705-6686