35.3mm Conveyor Bearings for Rollers D1DdHBLoading(lb) 37.7mm35.3mm12mm15.5mm11.5mm572 One slow speed unground flanged ball bearings for use with the conveyor rollers (pipes/cylinders), inner diameter bore=12mm, outer diameter=35.3mm, the mechanical drawing and the table above shows all the dimensions, the table shows also the load capacity, good luck building your conveyor system.