The nitro weld on sprocket hubs are bored to size hubs that can be used with weld on sprockets, pulleys or even custom applications. All of our hubs are an "X series" hub, which means they're compatible with any "x series" sprockets or pulleys. Sprocket X hubs are available in finished bore, square bore, hex bore, idler and splined bore. Bore sizes range from 1/2" ID up to 1-1/2" ID. The Nitro weld on hubs are manufactured from 1045 CD (cold drawn) steel and finished with a black oxide coating.
We recommend using Low Hydrogen Electrodes for welding sprockets and hubs. You can view the welding instructions here