This classification handles hydraulic system components and related accessories used in manufacturing sites. It broadly includes major equipment such as hydraulic pumps, hydraulic cylinders, hydraulic valves, and hydraulic motors, as well as auxiliary components like hydraulic hoses, fittings, filters, and pressure gauges. It covers components used in hydraulic drive systems for press machines, injection molding machines, construction machinery, machine tools, and other equipment, clearly distinguished from pneumatic and electric equipment. It comprehensively covers components for power transmission systems that use hydraulic fluid as a medium.