hard tooth surface gear shaft, hardened gear shaft Strictly Strictly according to ... and carbonize high precision soft/ hard-surfaced gear or gear shaft. The main specification is within Φ2000mm, Mn ... (see below)2.Flow chart of hard gear productionGear shaftFeature:High strengthAnti-corrosionEnvironmental protectionHeavy-dutyCNC minimum ... treatment, Induction hardening, carbonizing Hardened gear shaft