ZLYJ series is, designed specially for plastic extruder machine, a high precision hardness gear transmission unit. Hardness of gear surface can be HRC58-62, gear adopts grinding process and precision can be DIN. Tech. Data: Output speed: 8-20rpm Shaft force: 35-770kn Output torque: 800-100000N.M Power: 5.5 - 540 kw With cooling device if needed.