A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 6240-01-271-6230
NSN 5915-01-152-2684
NSN 5915-01-343-0941
NSN 4140-01-326-4182
NSN 5960-00-136-7046
NSN 5930-01-388-4586
NSN 5930-01-158-7607
NSN 5960-01-081-7745
NSN 6135-01-031-8078
NSN 6150-01-348-7916
NSN 5835-00-233-6327
NSN 7035-01-116-6223