A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 6105-01-486-3600
NSN 6135-00-309-0074
NSN 6135-01-327-2092
NSN 7035-01-106-3476
NSN 6650-00-872-0942
NSN 5998-00-618-4757
NSN 5930-00-636-8888
NSN 5920-01-172-8509
NSN 6685-01-292-6643
NSN 5945-00-977-2909
NSN 6685-01-658-1839
NSN 7035-01-633-9537