Hardness after hardening & tempering

HB280-320

Nitrided hardness  

HV850-1000

Nitrided case depth 

0.05-0.08mm

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