This classification handles various seal and packing components used to ensure sealing performance in hydraulic systems. It includes piston seals, rod seals, and wear rings for hydraulic cylinders, spool seals for hydraulic valves, shaft seals for hydraulic pumps, O-rings and packings for hydraulic fittings. Components are classified by material types such as NBR, FKM, and PTFE, by static and dynamic sealing applications, and by high-pressure and high-temperature specifications. These are essential consumable parts for preventing leakage and maintaining performance in hydraulic equipment. The scope covers specially designed products that correspond to hydraulic fluid pressure, clearly distinguished from general industrial gaskets and pneumatic seals by material, shape, and pressure resistance performance.