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 1/H-A, 1.63 in Bore Dia, 2-3/8 in Outside Dia, 2-1/2 in Pilot Dia, 2 in Bolt Circle Dia, 2 Bolt Holes, 0.88 in Overall Length, Steel For use with type QT bushing