Roller chain sprockets, sometimes called single-strand sprockets, have a series of teeth around a central bore and are used in combination with roller chains to move conveyors and other commercial machinery. Fixed bore sprockets are designed to fit a particular shaft size you need to include a keyway and setscrew so they’re ready to install. Basic bore sprockets are manufactured with out a keyway or set screw. Keyways or arranged screws could be machined to the precise size necessary by the existing shaft and application. Bushed bores have more clamping area around the shaft to supply a secure fit for high torque or high-power applications when the shaft is at risk of cogs and chains slipping, such as for example paper milling and agricultural machinery.