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Specification:
Diameter of pin screw and barrel:D*5mm-D**0mm
Diameter of cold feed or hot feed screw and barrel:D*0mm-D**0mm
L/D ratio :****8

Base  Materials:
1.*8CrMoAIA(JIS SACM**5)
2.*2 CrMo (AISI ***0)
3.4Cr5MoSiV1(JIS SKD**1)
4.9Cr*8MoV
5.HPT

Bimetallic alloy materials:
1.Fe-based alloy
2.Ni-based alloy/Deloro alloy
3.Co-based alloy
4.NiCo-based alloy
5.Tungsten carbide/Wolfram carbide

Technics:
Heat treatmen
High-frequency quenching
Nitriding treatment
Hard-chrome electroplating
Bimetallic alloy  welding
Bimetallic alloy centrifugal casting

Technical parameter:
Nitrided layer depth:0.**0.8mm
Nitrided hardness:*******0HV
Nitrided brittleness:less than grade 1
Surface roughness:Ra0.4
Linearity of screw:0.**5mm
Hard-chrome plating hardness after nitriding:>**0HV
Chrome-plating layer depth:0.****0.**5mm
Bimetallic layer depth:3mm

OUR STRENGTH:
1.offers considerate after-sales service: we have adjustors for your machine if there is any problem with our products.
2.ISO ***1:***8 approved: you won't worry about the quality of our products, each product will be inspected extremely strictly.
3.Location advantage: our company is close to NINGBO/SHANGHAI port and located on Zhoushan the screw capital

ABOUT ZHONGYANG: 
  Our factory manufactured with high-quality material, applying the method of hardening and tempering and nitriding, thus it enjoys the characteristics of long working life, wear resistance, and anti corrosion. Besides, the technique of hard alloy spraying or chrome plating can be used on the working surface of screw, which will make it have better using effectiveness. We can supply screw and barrel for Krauss Maffei ,ShangHai JwellL,CINCINNATI, HaiTian,weber and so on, we also can make screw and barrel according to your drawings, we even can design screw and barrel for you as long as you have connection size. 
            If have interest * *@********************g>