Weld-on hubs are made of low carbon steel for good welding compatibility. They are useful for welding into fan rotors, impellers, agitators, etc., which require secure mounting to the shaft. A standard type is available in addition to one that is specifically designed for use in the end disc of a conveyor pulley. Dodge Weld-On Hub, QD Type F, 4.43 in Bore Dia, 7 in Outside Dia, 6-3/4 in Pilot Dia, 5.63 in Bolt Circle Dia, 3 Bolt Holes, 1-1/4 in Overall Length, Steel For use with type F bushing