OPC is a specialized manufacturer of integral shaft bearings for use mainly as water pumps for water-cooled engines and also as rotational shafts in forklift side rollers and general machinery. The integral shaft bearing is a wide-type double-row bearing in which the ball tracks have been machined directly on the shaft. Advantages provided by this structure include a large shaft diameter in comparison with the bearing outer diameter, easy installation because of a simple housing configuration that does not require high precision, and high-speed rotation despite such configuration.