A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 5975-01-414-6995
NSN 6150-01-357-5075
NSN 5915-00-007-1297
NSN 5965-00-997-5764
NSN 5855-01-329-6087
NSN 6105-00-493-7553
NSN 5985-01-036-8821
NSN 5950-00-907-9549
NSN 6110-01-138-8364
NSN 5910-00-515-3586
NSN 6145-01-473-0300
NSN 5905-00-161-0633