A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 6220-00-240-3300
NSN 5935-01-655-9196
NSN 2925-01-252-8049
NSN 6645-01-389-1970
NSN 5835-01-267-3388
NSN 5920-01-544-8371
NSN 5895-00-270-6595
NSN 5998-01-029-6696
NSN 5996-01-057-9023
NSN 6220-01-587-1775
NSN 5945-01-540-4327
NSN 5920-01-023-0040