... HandQuality (ISO)Purpose1-2000-60-600mm20°, 25° or according to the customer's requirment.Right, Left, Spur5-8Enging Timing GearNote: ... 16MnCr5, 40Cr, 45#, 42CrMo, 20CrMnTi etc.or according to the customer's requirements 2.Heat treatment: Nitriding, Carburization and hardening ... , Quench and temper, Medium and high frequency.our workshop:the hobbing machine:package: Timing gear for auto diesel engine