Bolt-On Hubs with 4-Hole Bush work as a convenient means to secure fan rotors, steel pulleys, plate sprockets and impellers to a shaft. Bolt-On Hubs are taper bored to receive 4-hole bush that helps to improve balance at higher speed. These Bolt-On Hubs require no welding and cover bush sizes range from 1210 to 4040. Bolt-On Hubs with 4-Hole Bush is made from quality grade close grain grey iron material to ensure optimum performance for longer period of time.