UN 12x16x3 PU - Dynamic Hydraulic Cylinder Seal

Applications

Advantages

Technical characteristics

Main description

UN 12x16x3 PU is a dynamic U-ring seal designed for reciprocating motion applications in hydraulic and pneumatic systems. It is used as a hydraulic cylinder seal installed on pistons or in rod glands, where stable sealing performance is required under variable pressure and continuous linear movement.

The UN profile, based on a U-shaped cross-section, enables pressure-assisted sealing. Under operating pressure, the sealing lips expand against the mating surfaces, providing effective sealing while maintaining controlled friction levels. This design ensures reliable operation in hydraulic sealing applications, reducing leakage and protecting system components from premature wear.

The seal is manufactured from polyurethane (PU), a material known for its high mechanical strength, excellent abrasion resistance and resistance to deformation under load. Compared to elastomer materials, PU offers significantly longer service life in dynamic applications with high cycle frequency. It performs reliably in contact with hydraulic oils and standard industrial media.

The compact size 12x16x3 allows installation in space-restricted hydraulic cylinders, valves, actuators and industrial machinery. The seal supports smooth reciprocating motion, stable sealing force and predictable performance, making it suitable for demanding industrial applications and professional B2B use.

UN 12x16x3 PU is commonly selected for maintenance, OEM production and hydraulic system manufacturing, where durability, dimensional stability and consistent sealing behavior are critical.

FAQ - Frequently asked questions

What type of seal is UN 12x16x3 PU?
It is a U-ring seal designed for dynamic sealing in reciprocating motion.

Is the seal suitable for piston and rod applications?
Yes, it can be used on pistons or in rod glands, depending on system design.

What material is used?
The seal is made of polyurethane (PU) with high wear resistance.

Is PU better than NBR for dynamic sealing?
Yes, PU offers higher abrasion resistance and longer service life in dynamic applications.

Where is this seal typically used?
In hydraulic cylinders, pneumatic systems, industrial machinery and linear motion assemblies.