Large Single screw and barrel, Dia300x8700mm screw and barrel for extruder machine Single screw and barrel for extruder machinescrew size: dia20-500mmmax. length: ... HRc56°-65°) Roughness of the surface:Ra 0.4μm Screw straightness: 0.015mm/m Chrome plating thickness: 0.01- ... 0.1mm wear-proof, corrosion-proof, heatproof, high-pressure proof and high-speed proofSuitable plastic material: PP,PE,ABS,AS, ...