Finished bore sprockets provide increased prevention of shaft slippage over minimum basic bore sprockets. Completed bores allow for the roller chain sprocket to move larger loads with an increase of accuracy.
Toronto Gear Works produces ready-to-ship finished bore sprockets that are produced with precision and are fast and simple to install. Our catalogue features a Stainless Steel Chain variety of completed bore sprockets that can match many precise efficiency requirements.
Toronto Gear Functions stocks steel completed bore roller chain sprockets for #25 (0.250” pitch) roller chain. We stock these metal sprockets in tooth 
counts ranging from 9 to 72. Our finished bore sprockets with a 0.500” bore or smaller are supplied with 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 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 part numbers can be determined the following:
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 includes a hub. It includes a finished bore of just one 1.375” and it provides 72 teeth.