Click image to view full size image
Material: High quality 38CrMoAl(JIS SACM645)
Hardness after hardening and tempering: HB280-320
Nitrided Hardness: HV850-1000
Nitrided case depth: 0.50-0.80mm
Nitrided brittleness: less than grade 2
Surface roughness: Ra 0.4
Screw straightness: 0.015mm
Surface chromium-plating's hardness after nitriding: ≥900HV
Chromium-plating depth: 0.025~0.10mm
Alloy Hardness: HRC50-65
Alloy depth: 0.8~2.0mm
parallel twin screw and barrel
