Idler shell material:ZG40Mn
Surface Hardness:HRC48-52
Quench depth:>4mm
shaft material:45#
Surface Hardness:HRC48-58
Quench depth:>2.5mm
Idler support material:QT450-10/ZG35
Developed scope: below 100 series,100 series,200 series,300 series,400 series,600 series,800 series,1200 series