A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 5985-01-219-0896
NSN 6130-01-449-5267
NSN 6145-01-094-6822
NSN 5985-00-591-8001
NSN 5975-01-273-5966
NSN 6320-01-631-7828
NSN 5910-00-433-2774
NSN 6105-01-647-9676
NSN 5990-00-876-0576
NSN 6645-01-294-6403
NSN 6685-00-186-9190
NSN 5985-01-116-7255