A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 2925-00-225-5386
NSN 5998-01-451-6960
NSN 7035-00-079-7189
NSN 6135-01-367-6203
NSN 6320-00-925-0558
NSN 5910-00-893-3893
NSN 5998-00-275-7221
NSN 5996-00-111-3966
NSN 5930-00-841-6857
NSN 6150-00-572-1099
NSN 5930-00-513-7792
NSN 6645-00-951-0687