... 2.Surface treatment Carburizing, hardening and tempering, nitriding, heavy duty truck gearbox main shaft Detailed Product Description ISO/TS 16949:2009 ZF ... North Benz,Steyr,Mercedes Benz,etc OEM parts Forging Item main shaftItem NO.215 9304 001Brand NameHYBasic formforgingMaterial20CrMnTi / ZF ... Yaxing, Ankai(AK), JAC, Zonda, Daewoo, Neoplan, Kaisiboaer, etc. heavy duty truck gearbox main shaft