extruder Gear Boxe 1.hard gears speed reducer 2.for single and twin screw extruder 3.reliable quality extruder Gear Boxes are mainly used for the single screw extruders.Hard gears vertical speed reducer,Gears material: 20CrMoTi hard gears and conical gears,gears surface carburization Model: ZLYJ series, it can be used for the single screw with diameters from Φ45mm-Φ180mm