Taper Bore Weld-On Hubs are made of steel, drilled, tapped and taper bored to receive standard Taper Bushes.  The extended flange provides a convenient means of welding hubs into fan rotors, steel pulleys, plate sprockets, impellers, agitators and many other devices which must be firmly fastened entirely suitable for use where severe operating conditions are met.  Tightening the screws contracts the bore of the bush, thereby locking into the shaft with the equivalent of a press fit.  This type of construction eliminated mounting difficulties, it also prevents loosening and wearing occuring to the hub during operation.