SINGLE SCREW AND BARREL FOR RUBBER According to the customer demands to make the goods. Detailed Product Description Material: Alloy-Steel of High-Quality 1) 3oAlA(JIS SACM645) 2) 42CrMo(AISI 4140) 3) and so on Heat-treatment: Nitriding treatment Vacuum quenching Spray coating Bimetallic-alloy Rubber Screw specifications: Screw diameter: Φ 50 ~ Φ 500mm Maximun screw length: 10000mm Maximum barrel diameter: Φ 500mm Specifications Nitride layer depth 0.4 ~ 0.7mm Surface layer hardness Hv900 ~ 1060 (HRc 56 ° ~ 65 ° ) Surface roughness Ra 0.4μ M Screw straightness 0.015mm / m Chromium plating thickness 0.01 ~ 0.1mm
