The H&B series heavy-duty industrial gearboxes are a new type of hard tooth surface reducer, featuring a wide torque range and a modular design with a unit structure, allowing for both horizontal and vertical installation. They offer solid shaft, hollow shaft, and conical hollow shaft outputs, with a broad application scope. The gears are made of high-strength alloy steel carburized and quenched, boasting high efficiency, long service life, low operating noise, and high reliability.