A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 5915-00-407-7997
NSN 5835-01-010-3103
NSN 6130-00-473-6132
NSN 6650-01-481-3618
NSN 5930-00-995-2931
NSN 5855-01-172-4568
NSN 5930-01-571-6070
NSN 5905-01-157-3915
NSN 6620-01-528-7510
NSN 5998-00-167-2886
NSN 5915-01-526-9787
NSN 6145-01-064-3637