... barrel for injection mold machine. it's a special design for injection, based on bimetallic material screw and barrel for plastic injection molder machine/molding machineSize ... ,specifications: 30g-25000g screwDepth of nitrition layer: 0.5-0.8mmNitriding treatment, surface hardness: HV≥900-1000Fragility ... ≥950HVThickness of Cr coationg layer: 0.03-0.08mmUsed for granulation,PP, PE, PA, PC, ABS,AS etcWe ...