The BS40/50 Worm Gears from Thomson include a gear, bell house and matching coupling but no adaptor flange. The worm gear is ordered using the ordering keys on the downloadable datasheet, where you’ll also find data regarding the adaptop flange. This can be ordered seperately using the part numbers listed in the datasheet, as there are different adaptor flanges depending on the type of unit being used. We have multiple options available – please contact us to discuss your requirements. Worm Gears BS40 50 Datasheet