A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 5965-00-359-9769
NSN 6685-01-354-6321
NSN 5999-01-204-0035
NSN 5960-01-350-5332
NSN 5996-01-211-3562
NSN 6150-01-396-2832
NSN 6105-01-423-6757
NSN 6220-00-985-3465
NSN 6320-01-484-7734
NSN 2925-01-193-6689
NSN 5925-00-612-7159
NSN 5920-01-485-3280