spline shaft used to amounted between internal spline drive shaft and internal spline gear
Gear production process: turning- Broaching →hobbing→carburization heating→shot blasting-grinding
 
 
Material：20CrMnTi, 20CrNiMo(AISI 8620) or other alloy steel
Module: 0.8-8mm
Effective case depth:0.3-0.6mm
External spline section: protect from carburizing
Hardness:58-62HRC