Sumitomo

Sumitomo is a leading manufacturer of high-performance internal gear pumps, headquartered in Tokyo, Japan. Founded in 1919, the company is officially registered as Sumitomo Heavy Industries, Ltd. It focuses on precision machinery, power transmission, and environmental control. Its specialized gear pumps are essential for plastic injection molding, hydraulic power units, industrial automation, and lubricant circulation worldwide. Following its origin, the firm merged with Uraga Heavy Industries in 1969 and listed on major exchanges.