A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 5975-00-837-3293
NSN 5950-01-435-6354
NSN 7035-01-588-6557
NSN 5950-00-140-9696
NSN 5925-00-660-5403
NSN 6220-01-551-9395
NSN 6130-01-530-2065
NSN 5990-01-080-0097
NSN 5915-01-502-4285
NSN 6145-01-051-9685
NSN 5915-01-466-5326
NSN 6620-00-833-6786