A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 5965-01-218-7795
NSN 5835-00-074-3700
NSN 5990-01-558-4536
NSN 6220-01-371-1791
NSN 7035-01-526-0191
NSN 6645-01-440-5500
NSN 6220-01-124-0923
NSN 5920-01-497-2352
NSN 6610-00-935-7131
NSN 5985-01-116-4282
NSN 6145-01-227-5246
NSN 5945-01-506-3074