Roller chain sprockets, cogs and chains sometimes called single-strand sprockets, have a series of tooth around a central bore and so are used in combination with roller chains to move conveyors and other commercial machinery. Fixed bore sprockets are created to fit a specific shaft size you need to include a keyway and setscrew therefore they’re ready to install. Basic bore sprockets are produced without a keyway or established screw. Keyways or set screws could be machined to the specific size needed by the prevailing shaft and application. Bushed bores have more clamping area around the shaft to provide a secure suit for high torque or high-power applications when the shaft is at risk of slipping, such as for example paper milling and agricultural machinery.