This Boston Gear F651B-4-B11 reducer 20 HP input, 4:1 ratio, 2903 in-Lb torque is a gearbox/mechanical drive component manufactured by Boston Gear. It transfers mechanical power between a drive source and the equipment it operates, adjusting speed and torque as needed. Key specifications noted on this listing include 4:1 Ratio. It is commonly in automated machinery and motion-control equipment.
