Taper bushed type S weld-on hubs are suitable for use in many applications such as for welding to plate steel sprockets. The outside diameters of these hubs have been reduced to a minimum. This is permissible because of the reinforcing strength of the items to which they are to be welded. Type S weld-on hubs are made of steel, drilled, tapped and taper bored for tapered bushings. Their small size and the convenience and advantages of taper bushed construction make them of great value on many devices for use on shafts. Martin Weld-On Hub, TB Bushed Type S, 3-3/8 in Bore Dia, 4-1/4 in Outside Dia, 4-1/8 in Pilot Dia, 3-1/4 in Bolt Circle Dia, 2 Bolt Holes, 1-3/4 in Overall Length, Steel