... High Quality & Reliability 5. Self Adapting Frequency induction auto parts hardening machine Heat Treatment like annealing, normalizing, quenching, tempering ... such as crankshaft, connecting rod, piston pin, chain wheel, aluminum wheel, valve, rock arm shaft, semi drive shaft, small ... .5. Various hardware metal parts and machined parts, such as big shaft, gear (chain wheel), camshaft, chuck and clamp ...