The Aurora Shaft Mount Reducer Models (DIR Sizes 1-10) and Aurora Screw Conveyor Drive Reducer Models (DIRSC sizes 1-8) are ideal for power conveyors, mixers, elevators, extruders, pumps, and many other applications that require heavy duty applications. The speed reducer shall be either belt driven or direct coupled, enclosed shaft-mount-type unit with double reduction ratio. The reducer is mounted directly on the driven shaft and utilizes an adjustable torque arm to support the gear case to the supportive structure. All gearings are helical design, case carburized, precision ground not shaved, with a Rockwell hardness C 58-62 with a resilient core for high shock load capacity. All shaft mounts contain double lip seals, spring load type made of nitrile rubber. Tapered bushings with range of bore variations provide an easy way to mount the reducer. All housing are made of high strength ductile iron.