Below is a list of Gear Manufacturers manufacturers from California. Gear manufacturers are companies that produce industrial gears; gears are tools used for torque transmission. Gears are used in conjunction with other gears and parts, and they engage mechanical motion or transfer rotational torque power and motion through a shaft, other gears or series of parts. In the food processing, textile manufacturing, clock making, heavy industrial mining equipment, oil exploration and in countless other industries, gears make the efficient and effective operation of all kinds of equipment possible.