Instructions for screw:

1.We are a professional company specialized in manufacturing many types of screw, the barrel can be applied on all types of injection moulding machine,rubber hot-feeding extruder, rubber cold-feeding extruder, pin barrel cold feed extruder, plastic extruder with different specifications.
2.The models of screw include:

Variable pitch and variable depth, variable pitch and equal depth, variable depth and equal pitch, and equal depth and pitch.

Groove multi-die type, composite type, mixing type and separating type.

 

Alloy-steel of high-quality

1)38 CrMoAIA(JIS SACM645)

2)42CrMo(AISI4140)

3)9Cr18MoV

4)CW6Mo5Cr4V2

5)SKD61

Heat-treatment

Nitriding treatment

Electroplate hard-chrome

High-frequency quenching

Spraying corrosion wear-resisting dual metal layers

Vacuum quenching

Technical Parameter

Steel Material	DIN 41CrA1Mo7 / AST M4140 / GB 38CrMoAlA
Deepness of Nitriding Layer	0.7 mm -0.9 mm
Hardness of Nitriding	HV900 - HV1,000
Nitriding Brittleness	≤Grade 1
Chromate plating	Thickness 0.05 mm - 0.10 mm, hardness HV950
Special treatment	Carbide coating on screw flight and bimetallic barrel
Screw straight tolerance	0.015 mm/m
Surface roughness	Ra 0.4μm

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