A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 5895-01-629-2229
NSN 5925-00-969-8672
NSN 5996-01-566-0344
NSN 6685-01-617-6049
NSN 4140-01-462-7737
NSN 5835-01-010-3103
NSN 6620-00-955-6122
NSN 6685-00-405-2525
NSN 5965-00-948-2809
NSN 6650-00-181-1446
NSN 6220-01-171-8383
NSN 5996-01-652-0700