UN Rod Seal Series PU Seal for Hydraulic Cylinders in Industrial Applications

The UN oil seal series is a proven sealing solution for hydraulic cylinders, specifically engineered to withstand dynamic rod motion and internal pressure. Manufactured by NQKSF, the UN series includes three configurations—UN, UNS, and UHS—each suitable for different mounting and performance conditions.

• UN: The standard rod seal with a balanced U-cup design, commonly used in industrial hydraulic systems.

• UNS: A short-bodied variation for applications with limited axial installation space.

• UHS: A heavy-duty version with a longer body, designed to handle higher pressures and more demanding mechanical conditions.

These seals are primarily made from polyurethane (PU), offering excellent abrasion resistance, sealing performance, and durability in both low and high-pressure environments. Depending on operating conditions, NBR and PTFE materials are also available.

The UN series is widely used in:

• Hydraulic cylinders for industrial machinery

• Construction equipment including excavators and bulldozers

• Agricultural machinery such as harvesters and loaders

• Energy sector machinery like wind turbines and power plant systems

• Automated production lines and robotic arms

• Material handling equipment including lifts and cranes

• Fast delivery from in-stock items: Over 10,000 standard models of O-rings, oil seals, and hydraulic seals are available for rapid dispatch.

• Custom development: From material selection and geometry optimization to production and testing, NQKSF supports full-cycle custom seal solutions.

• Engineering support: With over 30 years of industry experience, NQKSF helps customers enhance seal reliability and system longevity while reducing maintenance costs.

• In-house smart manufacturing facilities

• Recognized leader in sealing systems

• Inventory-ready for global clients

• Exported to over 80 countries worldwide

• Certified as a Provincial Innovation Center

• Registered as a Specialized and Innovative Enterprise

• Accredited National High-Tech Enterprise

• Core member of a leading sealing product cluster

When selecting rod seals for demanding hydraulic applications, the UN series from NQKSF provides performance, flexibility, and support. Designed to integrate with a wide range of systems, these seals are trusted by industries that require precision and endurance. For both standard and custom needs, NQKSF delivers solutions that meet global expectations.