barrel and twin screw: Φ 35/70- Φ 92/178 The above are standard specifications, we can customize according to customers' requirements. The compression raio of screws can be desighed according to different products and ingredients. Appliance PVC, PP, PE, PA, PC, ABS, AS etc Material&Processes 1) High Quality 38CrMoAlA 2) Advanced Nitride Processes 3) Corrosion & Abrasion Resistance Bimetal Spraying Process Technical Parameters SCREW 1) Nitride Depth: 0.55-0.7mm 2) Nitride Hardness: 850-960HV 3) Surface Roughness: Ra≤0.8um 4) Screw Straightness: 0.015mm 5) Bimetallic Hardness: HRC50-62 6) Bimetallic Depth: 1.5-2.0mm BARREL 1) Nitride Depth: 0.55-0.7mm 2) Nitride Hardness: 960-1020HV 3) Surface Roughness: Ra≤1.6um 4) Bimetallic Hardness: HRC50-65 5) Bimetallic Depth: 1.5-2.0mm