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Chain Size
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Strands
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System of Measurement
Bore Diameter
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Number of Teeth
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Hub Style
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Outside Diameter
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Roller Chain Sprockets

Roller chain sprockets are used for guiding roller chains and transmitting mechanical power between rotating shafts in applications requiring roller chains, from bicycles to other forms of machinery. Sprockets consist of a wheel-like disc with teeth around the diameter… Learn More

Chain size indicates the size of a roller sprocket chain with a short series of numerical digits, sometimes followed by a letter. The sprocket must have the same chain size as the roller chain it is used with. Style is the overall shape and design of the roller chain sprocket and how it attaches to machinery. Styles include bored-to-size, idler, minimum plain bore (MPB), Quick-Disconnect (QD), reboreable, split taper, and taper bushed sprockets.

Strands for roller chain sprockets indicate the sets of teeth and number of chains needed for the application. They come in single strand, double single strand, double pitch strand, double strand, and triple strand chains. As the number of strands increases, the tensile strength and load capacity also increases.

Bore diameter is the diameter of the bore hole through the center of the sprocket. The bore diameter must either fit with the object that the sprocket attaches to, or be reboreable for increasing the bore hole to the necessary size for attaching.

The number of teeth on a roller chain sprocket affects the chain speed. As the number of teeth increases on a sprocket, the speed decreases due to increased friction. A greater number of smaller teeth are often selected for applications requiring more strength and greater load capacity. Consider the required speed and load when selecting the number of teeth on a sprocket.

Hub style indicates how the sprocket attaches to a piece of machinery. Styles include Type A (hubless), Type B (single hub on one side of the sprocket), and Type C (hubs on both sides of the sprocket). Consider the space available, and the required strength of the attachment, when selecting a hub style.

Material type differs depending on the load size and the application environment.

Outside diameter is the entire width across a sprocket, including the full length of the teeth.

Pitch is the distance between two roller centers (the rolling pins where each link of chain connects) used with the sprocket, and is the distance from one side of a sprocket tooth to the other. As pitch increases, this reduces the angle of movement for the roller chain as it moves over the teeth of the sprocket.

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