A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 6145-01-377-5130
NSN 6105-00-866-0368
NSN 6620-01-446-4797
NSN 6240-01-136-2604
NSN 6620-00-239-6153
NSN 5920-00-717-6839
NSN 5985-01-573-7194
NSN 6105-01-461-4683
NSN 5990-01-478-8638
NSN 5855-01-107-5925
NSN 6685-01-383-7499
NSN 5835-01-062-6258