Screw and barrel parameter table

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ItemTypical Range
Screw DiameterΦ15 mm – Φ350 mm
Screw L/D Ratio15:1 – 46:1
Pitch1D / 1.2D / 1.5D
Compression Ratio1.2:1 – 3:1 (customizable per material)
Material38CrMoAlA, 42CrMo, bimetal alloy, nickel-based alloy, tungsten alloy, etc.
Surface TreatmentNitriding, chrome plating, alloy welding, hardening
Barrel Bore DiameterΦ15 mm – Φ350 mm
Barrel LengthAccording to screw length and L/D ratio
Heating Zones3 – 10 zones
Heating MethodElectric heating bands, ceramic heaters, aluminum casting heaters
Cooling MethodAir-cooled / Water-cooled
Nitriding Depth0.4 – 0.7 mm
Nitriding HardnessHV 900 – 1100
Straightness≤ 0.015 mm/m
Surface RoughnessRa 0.4 – 0.8 μm

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