A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 6645-00-536-1555
NSN 5985-00-983-4751
NSN 5998-00-431-0342
NSN 5960-00-269-4762
NSN 5975-01-438-7435
NSN 5990-01-548-5979
NSN 6240-01-541-2503
NSN 5975-01-150-3121
NSN 6685-01-462-1770
NSN 5915-00-988-2742
NSN 5910-00-246-3561
NSN 5945-00-419-8271