A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 6130-01-462-0155
NSN 5985-00-104-0301
NSN 6135-00-686-4777
NSN 5855-01-618-8462
NSN 5835-01-035-2976
NSN 5920-01-477-2115
NSN 6105-01-037-3893
NSN 6150-01-477-4374
NSN 6130-01-034-7243
NSN 6610-01-466-9058
NSN 5975-00-942-1925
NSN 5835-01-261-9878