... ° Nitrided Depth 0.5 0~0.7mm Nitrided Brittleness above 2 stage Surface Roughness Ra0.4 Screw straightness 0.015mm Hardess ... -plating Depth 0.05~0.10mm ALLoy Depth 0.8~2.0mm Alloy hardness HRC56°~65° Alloy iron,nickel,tungsten,molybdenum Types ... type,double screen type,shunt type,separation type,exhaust type,pin type,mixed type,double-head type,three-head type,multi ...