... Small spur gear Good performance High precision and durable Capacity ... be reached HRC58-623) Gear Mould no.: 0.3~154) Teeth profile: Spur,Helical,Worm,Spiral ... other types 5) Use application: gear box for steelworks Product TypeCNC hobbing gearMaterial:42CrMo, 20CrMnMo, ... 20Cr2Ni4, 35CrMo, 20CrMnTi ,17CrNi2MoA and other high intensity alloy steelProcess methodCNC Turning, milling ,hobbing, ...