Our cast iron reducer housing, also known as gearbox shell, is the key casing component for industrial speed reducers and gear transmission units, normally made of high grade gray cast iron HT200 or HT250, which features high rigidity, good vibration absorption and excellent sealing performance, protecting internal gears, bearings and lubricating oil during continuous heavy-load operation. This gearbox casting adopts reinforced rib structure and integrated multi-bore design,