A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 5975-00-833-9596
NSN 6150-01-414-7800
NSN 6240-00-935-9523
NSN 5985-01-421-7570
NSN 5910-00-701-9172
NSN 5835-00-807-5632
NSN 5895-01-371-4623
NSN 5915-00-440-7272
NSN 5945-00-035-9056
NSN 5920-01-407-0406
NSN 5915-01-534-9770
NSN 4140-00-482-9221