1.single stage gearbox/speed reducer 2.HRC54-62,hard gear 3.Oil cooling 4.Low Noise 5.High efficien ... arrangementMaterial quality (high loading capacity)processes by carburization, quenching and tooth grinding processZLYJ112,133,146,173,200,225,250,280,315 ... available, please contact me for further informaiton . single stage gearbox/speed reducer for single-screw extruder