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Screws and Barrels for Injection Molding Machine Keywords:screw barrel for injection molding machine , bimetallic screw barrel, extruder screw barrel, extruder barrel Specifications:*0g*****0g screws, can be matched with corresponded screw heads, distributors, barrels according to customer's requirement Depth of Nitrated Layer: 0.**0.8mm Hardness of nitration:*******0Hv Fragility of nitration: Less than grade 1 Surface roughness: Ra 0.4um Surface Hardness of Nitrated Cr coating Layer:≥**0Hv Hardness of Bimetallic Layer: HRC*5?**2? Thickness of Cr-coating Layer: 0.***0.*8mm Depth of Bimetallic Layer :＞2mm