A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 5910-01-270-1083
NSN 6610-00-582-1107
NSN 6650-00-960-5040
NSN 2925-01-419-3805
NSN 6130-00-554-7852
NSN 6130-00-225-7248
NSN 6610-01-304-3226
NSN 5925-01-649-4353
NSN 5998-00-658-3203
NSN 5920-00-721-0721
NSN 5945-01-256-4133
NSN 5985-01-411-7039