Boston Gear F221D-10-B5 is a 200 Series Optimount gear reducer with a 10:1 reduction ratio and a hollow-output shaft, designed for quill-input via a C-face flange and a basic-mount configuration. It uses a 0.625-inch input shaft and a 1.000-inch hollow output shaft (B5 bore), enabling compact mating to drive components in tight installations. Distributor listings describe this model as a double-reduction, without-base unit in the F221 family, well suited for conveying, packaging, and other small-machine applications requiring reliable torque transmission.
