1. material: brass,bronze, 40Cr,45#;20CrMnTi 2. process: hobbing, shaping; 3. gear inspect center the product: ... customer's requirment.Right, Left, Spur5-8machine, auto,tractor, machine for agriculture,hydraulic pump,engine, transmissionNote: 1.The material can ... 42CrMo, 20CrMnTi etc.or according to the customer's requirements 2.Heat treatment: Nitriding, Carburization and hardening, Quench and temper ...