Finished bore sprockets offer increased avoidance of shaft slippage more than minimum simple bore sprockets. Finished bores enable the roller chain sprocket to go 
larger loads with an increase of accuracy.
Toronto Gear Works produces ready-to-ship completed bore sprockets that are manufactured with precision and are fast and easy to install. Our catalogue includes a variety of finished bore sprockets that may match many precise efficiency requirements.
Toronto Gear Works stocks steel completed bore roller chain sprockets for #25 (0.250” pitch) roller chain. We share these metal sprockets in tooth counts which range from 9 to 72. All of our finished bore sprockets with a 0.500” bore or smaller are given two set screws. All of our finished bore sprockets with a 0.625” bore or greater have a typical keyway and two set screws. The keyway is certainly centered on the tooth and the arranged screws can be found over the main element at 90 degrees.
Steel finished bore #25 roller chain sprocket component numbers can be determined the Conveyor Chain following:
25BF + Tooth Count + “x” + bore size.
An example will be 25BF72x1-3/8. This is for a #25 roller chain. It includes a “B” style sprocket which means that it has a hub. It has a finished bore of just one 1.375” and it provides 72 teeth.