Roller chain sprockets, sometimes called cogs and chains single-strand sprockets, have a series of tooth around 
a central bore and are used in combination with roller chains to go conveyors and other commercial machinery. Fixed bore sprockets are created to fit a particular shaft size and include a keyway and setscrew therefore they're ready to install. Ordinary bore sprockets are manufactured without a keyway or arranged screw. Keyways or set screws could be machined to the precise size required by the prevailing shaft and app. Bushed bores have more clamping region around the shaft to provide a secure match for high torque or high-power applications when the shaft reaches risk of slipping, such as for example paper milling and agricultural machinery.
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