A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 5920-01-442-4937
NSN 5895-01-483-7705
NSN 5920-01-442-0732
NSN 5855-00-494-9581
NSN 5965-01-633-8849
NSN 6650-00-500-6455
NSN 5930-00-143-4582
NSN 5945-01-548-5811
NSN 2925-01-228-6554
NSN 5996-00-553-7348
NSN 6130-01-294-7906
NSN 5965-00-113-9748