A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 6220-00-938-6116
NSN 5996-01-377-2439
NSN 5920-00-127-9992
NSN 6645-01-208-3440
NSN 5930-00-447-4251
NSN 5975-01-126-3116
NSN 5985-01-284-7435
NSN 4140-01-105-2017
NSN 5975-01-074-7860
NSN 6135-01-460-8830
NSN 5975-00-567-2766
NSN 5965-01-222-0166