Finished bore sprockets provide Conveyor Chain increased avoidance of shaft slippage more than minimum ordinary bore sprockets. Completed bores allow for the roller chain sprocket to go larger loads with an increase of accuracy.
Toronto Gear Functions produces ready-to-ship completed bore sprockets that are produced with precision and are fast and simple to install. Our catalogue features a variety of finished bore sprockets that may match many precise efficiency requirements.
Toronto Gear Works stocks steel finished bore roller chain sprockets for #25 (0.250” pitch) roller chain. We stock these steel sprockets in tooth counts ranging 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 completed bore sprockets with a 0.625” bore or greater have a typical keyway and two established screws. The keyway is centered on the tooth and the set screws are located over the main element at 90 degrees.
Steel finished bore #25 roller chain sprocket component numbers could be determined as follows:
25BF + Tooth Count + “x” + bore size.
An example would 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 includes a finished bore of 1 1.375” and it offers 72 teeth.