Porduct Name: Big barrel screw [back]
Product characteristics：
Surface roughness：Ra0.4um
Screw straightness：0.015mm
Nitriding hardness：Hv≥900
Alloy layer thickness≥2mm
Nitriding depth：0.5-0.8mm
Hardness HRC58
Nitriding brittleness：≤Grade II
Thickness of chromium coating：0.03~0.05mm