... single screw extruder 1.Suitable plastic material: PP,PE,,AS,PS etc. 2.Material: SACM-645, SCM440, 38CrMoALA 3.high qualtity single screw extruderSize:screw diameter ø15-ø300mmMaximum screw ... Rougness of the surface:Ra0.46.Linearity of the screw:0.015mm7.The surface hard chromium plating hardness ... 0.8-2.0mm Used for granulation ,PP,PE,PA,PC,ABS,AS etcWe can manufacture various kinds of screw barrels