... .material:steel 2.Surface treatment Carburizing, hardening and tempering, nitriding, heavy duty truck gearbox main shaft Detailed Product Description ISO/TS 16949:2009 ... (Beiben truck, Beifang Benchi), Golden Prince, Hoka, Hongyan, Yutong, King Long, Yaxing, Ankai(AK), JAC, Zonda, Daewoo, Neoplan, Kaisiboaer, etc. heavy duty truck gearbox ...