Weld-on hubs are manufactured from steel, they are drilled, tapped and taper bored. The outer diameter is machined with a shoulder that provides a location point when welding to its mating component. Bolt-on hubs are manufactured from cast iron, drilled, tapped and taper bored. The outer flange has pre-tapped threaded holes for fixing to a fan rotor, plate wheel and various other components.
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