Weld-on hubs are made of 1015-1025 steel, drilled, tapped and taper bored to receive the taper-lock bushing. They are useful for welding into fan rotors, pulleys, plate sprockets, etc., which must be firmly mounted onto shafting. Four types of hubs are available from stock. Dodge Weld-On Hub, Taper-Lock Type W/WA, 1.88 in Bore Dia, 2.88 in Outside Dia, 2-1/2 in Pilot Dia, 1-3/4 in Bolt Circle Dia, 2 Bolt Holes, 1-1/2 in Overall Length, Steel Type W/WA taper-lock-rugged, full-length size for single-hub, heavy duty applicationsFor use with type 1215 bushing