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Also known as sprocket-wheels, sprockets are mechanical wheels with teeth, or cogs, designed to interlock with power transmission roller chain to transmit power between shafts. Pilot bore sprockets, or rough stock bore sprockets, come with a small centred hole which requires boring and machining to match the shaft's bore and keying. They are commonly used in wide range of industrial machinery. Taper lock sprockets are supplied with a large hole, which will fit a specific taper lock bush for simple and quick fitting. This creates a strong clamp fit on the shaft and offers great flexibility, allowing sprockets to be quickly changed. Plate wheel sprockets are flat sprockets which have no boss and come with a straight “pilot bore” hole in the middle. Sprockets and plate sprockets are available in both British Standard and American Standard in a range of tooth numbers.

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