Tin Coated Screw Tip and Stop Ring and Check Value

Screw barrel suit for your PP, PE, PVC, HDPC, LDPC. We supply screw barrel according to your requirement. Belows is our screw barrel's technician index: Depth of Nitrated Layer: 0.5-0.8mm Hardness of nitration: 900-1020Hv Fragility of nitration: Less than grade 1 Surface roughness: Ra 0.4um Hardness of Cr-coating Layer: ≥ 950Hv Thickness of Cr-coated Layer: 0.03-0.08mm Hardness of Bimetallic Layer: HRC55-72 Depth of Bimetallic Layer: >2mm