... gears (spur gear, bevel gear, sprial gear, ring gear, internal gear, sprocket, chain wheel) transmission, gear box, reducer ... 1500mmProcessingPrecision hot and cold forging, casting, precision machining and roll forming.MachiningTurning , milling , drilling ... , grinding , threading , CNC machining, etc. Heat TreatmentAnnealing, normalizing, carbonitriding, carburizing, tempering ...