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 2/JA-A, 1.38 in Bore Dia, 2-1/4 in Outside Dia, 1.65 in Bolt Circle Dia, 3 Bolt Holes, 0.56 in Overall Length, Steel For use with type JA bushing