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Product Details    Key Specifications/Special Features:Materials:DIN 1.8550, Din 1.851941CrAlMo7AISI4140W6Mo5Cr4V2SKD61,SKD11SCAM64538CrMoAlTechnical Index:Depth of Nitrated Layer:0.5~0.8mmHardness of nitration: 950~1100HvFragility of nitration: Less than grade 1Surface Hardness of Nitrated Cr coating layer: 950HvHardness of Bimetallic Layer: HRC55~72Thickness of Cr-coating Layer: 0.03~0.08mmDepth of Bimetallic Layer:>2mmProduct classification:Aiming at different plastic products the screw can be chosen: general type, pin type, barrier type, separation type, and gas-exhausting type, etc.P