A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 6240-00-022-2794
NSN 6240-01-485-3116
NSN 5996-01-044-6241
NSN 6110-01-482-5620
NSN 5950-01-044-1965
NSN 6685-01-490-0962
NSN 5930-01-087-5573
NSN 6610-01-083-1446
NSN 6105-01-625-6050
NSN 5895-00-607-0078
NSN 6320-00-731-6134
NSN 5895-01-338-8887