A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 5975-00-464-7535
NSN 6650-01-442-6467
NSN 5950-01-536-4262
NSN 5915-01-459-2109
NSN 6110-00-334-0230
NSN 5920-01-439-3790
NSN 6650-00-840-9758
NSN 6130-00-560-6547
NSN 5925-01-249-5285
NSN 5990-01-529-7307
NSN 7035-01-463-9855
NSN 4140-01-504-8326