A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 5910-00-876-9322
NSN 6610-00-111-3159
NSN 6135-01-222-0703
NSN 2925-00-194-7407
NSN 5998-01-100-1678
NSN 5920-01-481-6012
NSN 5996-00-698-8443
NSN 6105-00-262-2224
NSN 6135-01-167-7604
NSN 5965-01-603-0118
NSN 5855-01-114-3513
NSN 6135-01-443-7716