A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 5930-01-634-0659
NSN 6135-01-518-9813
NSN 5965-01-267-8536
NSN 6150-01-573-6773
NSN 5930-00-230-7492
NSN 6145-01-467-5452
NSN 6145-00-140-1605
NSN 5935-00-826-8548
NSN 5935-00-393-3720
NSN 6150-01-449-1339
NSN 5910-00-396-3300
NSN 5935-01-200-7948