Gears

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Gear sizes vary greatly depending on their application. Smaller gears, known as pinion gears, typically have a diameter of less than one inch and are used in high-speed applications such as watch mechanisms and bicycle gear systems. Medium-sized gears, often referred to as spur gears, usually measure between two and six inches in diameter. These are commonly found in industrial machinery, automotive transmissions, and power tools. Large gears, sometimes called helical gears, have a diameter of more than six inches and are frequently used in heavy-duty equipment such as construction machinery, industrial robots, and wind turbines. The largest gears, often referred to as ring gears or bevel gears, can reach diameters exceeding 12 feet. These massive gears are typically found in extremely heavy-duty applications like oil rigs, mining equipment, and large industrial turbines.