Item

screw and barrel

screw type

hot feeding screw,cold feeding screw

Material

38CrMoAIA

Tempering hardness

240-280HV

Nitride layer thickness

0.5-0.8mm

Nitride brittleness

<= Grade 2

Surface Roughness

Ra0.4m

Screw Straightness

0.015mm

Note:The screw is via the heat treatment,nitriding treatment,high-frequency quenching,Spray-coating the bimetallic layer.