C63000 Nickel Aluminum Bronze (AMS 4640) is an extruded or forged wrought aluminum bronze that contains nickel, and is alloyed for exceptional strength and toughness. It’s used where higher mechanical properties are required. It’s used in equipment for the energy markets, in aircraft, marine and a host of other industrial applications. It finds use as valve stems, high strength bushings, valve guides and seats, gears, cams, ship propellers, as well as propeller nuts and shafts. Larger rounds, ring and shapes can be forged and rough machined.