... , fastener, fabricated mechanical part, bronze lock, rivet, and steel pin.2. Hot fitting refers to the connection of different metals ... automobile and motorcycle fittings, such as crankshaft, connecting rod, piston pin, chain wheel, aluminum wheel, valve, rock arm shaft, semi drive shaft ... hardware metal parts and machined parts, such as shaft, gear (chain wheel), cam, chuck and clamp etc.6. Quench for ...