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Metric sprockets are designed to adhere to the metric measurement system, which is widely used in many countries around the world. They are commonly used in various applications, including machinery, conveyors, bicycles, motorcycles, and industrial equipment.

Here are a few key points about metric sprockets:

1. Measurement System: Metric sprockets are measured using the metric system, which utilizes millimeters (mm) as the primary unit of measurement. This differs from imperial sprockets, which are measured in inches.

2. Pitch Diameter: The pitch diameter of a metric sprocket refers to the diameter of the circle that passes through the center of the sprocket's teeth. It is measured in millimeters and helps determine the appropriate chain size to be used.

3. Teeth Profile: Metric sprockets can have different teeth profiles, such as standard (ISO) or specialized profiles for specific applications. The teeth profile determines the engagement and smooth operation of the sprocket with the corresponding chain.

4. Bore Size and Keyway: Metric sprockets have a designated bore size, which is the diameter of the central hole through which the shaft passes. They may also have a keyway, a slot that allows a key to be inserted to prevent rotation between the sprocket and the shaft.

5. Material and Construction: Metric sprockets are typically made from high-quality materials such as steel or alloy, ensuring durability and resistance to wear and tear. They may undergo various manufacturing processes, including heat treatment, to enhance their strength and performance.