Finished bore sprockets offer increased prevention of shaft slippage more than minimum ordinary bore sprockets. Finished bores allow for the roller chain sprocket to go agricultural Chain larger loads with an increase of 
accuracy.
Toronto Gear Works produces ready-to-ship finished bore sprockets that are manufactured with precision and so are fast and easy to install. Our catalogue includes a variety of completed bore sprockets that may match many precise performance requirements.
Toronto Gear Functions stocks steel finished bore roller chain sprockets for #25 (0.250” pitch) roller chain. We stock these metal sprockets in tooth counts ranging from 9 to 72. All of our finished bore sprockets with a 0.500” bore or smaller are supplied with two set screws. Our completed bore sprockets with a 0.625” bore or greater have a standard keyway and two arranged screws. The keyway can be centered on the tooth and the established screws are located over the main element at 90 degrees.
Steel finished bore #25 roller chain sprocket part numbers can be determined as follows:
25BF + Tooth Count + “x” + bore size.
An example would be 25BF72x1-3/8. That is for a #25 roller chain. It has a “B” style sprocket which implies that it has a hub. It includes a finished bore of just one 1.375” and it offers 72 teeth.
