A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 6145-00-691-3609
NSN 5960-01-069-2009
NSN 2925-00-315-8442
NSN 5965-01-277-1648
NSN 5945-00-569-4793
NSN 5996-01-174-3183
NSN 7035-01-366-5912
NSN 6105-01-386-7915
NSN 7035-00-703-3535
NSN 5999-01-080-2644
NSN 6320-00-360-1744
NSN 5999-01-333-1556