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Bimetallic Extruder Screw and Barrel for Plastic Extruder. Custom Base Material: Available in 38CrMoAlA and 42CrMo for specific application needs. High Hardness Coating: Alloy plating and chrome coating reach HRC 62-72 for durability. Precision Nitriding: 7-day nitriding treatment ensures HV>900 surface hardness. Advanced Manufacturing: Utilizes Fanuc CNC machines and 18m depth hole drilling tech. OEM/ODM Support: Full OEM and ODM services available with CAD confirmation. High Precision Straightness: Screw straightness controlled within 0.015mm tolerance. Established Manufacturer: Factory founded in 1988 with 30+ years of industry experience.