... , fastener, fabricated mechanical part, bronze lock, rivet, steel pin and 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 ... hardware metal parts and machined parts, such as shaft, gear (chain wheel), cam, chuck and clamp etc.6. Quench for ...