Altra Industrial Motion Corp. 721-20-G Gearbox

The Altra Industrial Motion Corp 721-20-G Gearbox is a Boston Gear 700 Series worm-speed reducer configured as a G Assembly, single-reduction worm gear reducer that ships without a base. The 721-20-G model specifies a 20:1 reduction ratio, delivering a compact gear reduction within the 700 Series footprint. This gearbox is part of Altra's Boston Gear lineup, reflecting the durable, industrial‑grade construction typical of worm-drive reducers used in a wide range of industrial equipment. The unit is a self-contained gearbox intended for OEM applications and retrofits that require a 20:1 reduction with a worm-drive configuration in a base-less assembly. The combination of brand heritage and the 700 Series specification helps ensure interchangeability with compatible drives and straightforward maintenance within a standard industrial power-transmission setup.