... 1.for conical twin screw extruder 2.model:SZ45,50,65,80,92 3.SKF and NSK bearings extruder speed reducer ... are mainly used for the twin screw extruders.Hard gears vertical speed reducer ... conical gears,gears surface carburization Model: SJZseries, it can be used for the single screw with diameters from Φ45/60mm,-Φ50 ...