Double-Lipped Rod U-Cup Seal
XHH Seals offers a premium Double-Lipped Rod U-Cup Seal engineered for high-efficiency sealing in moderate to high-pressure hydraulic systems. This advanced seal design features an asymmetrical profile with a secondary sealing lip that enhances sealing performance while providing an additional barrier against contamination. It is widely used as a primary rod seal in rugged environments across industrial and mobile hydraulic equipment.
Available in both standard and custom sizes, this versatile seal is machined or molded from high-grade materials to meet the demands of modern hydraulic systems.
Key Features
Supports pressure up to 400 bar (6000 psi)
Wide temperature range with material flexibility
Double-lip design improves sealing efficiency and contaminant protection
Exceptional wear and extrusion resistance
Easy to install and compatible with standard rod grooves
Available in metric and inch sizes, up to 2 meters in diameter
Custom materials and dimensions available on request
Typical Applications
XHH’s double-lipped rod seals are commonly used in:
Mining and construction equipment
Agricultural hydraulic systems
Hydraulic cylinder production and repair
Injection molding and pressing equipment
Industrial automation and heavy machinery
Material Options
To meet varied environmental and fluid conditions, our double-lipped U-cup rod seals are manufactured from the following high-performance materials:
| Material | Temp. Range | Fluid Compatibility | |
|---|---|---|---|
| Hydrolysis-Resistant Polyurethane (H-PU) | -20°C to +115°C | Hydraulic oil, water-oil emulsions, HFC fluids | |
| Injection Molded Polyurethane (TPU) | -30°C to +110°C | Hydraulic fluids, water-based media | |
| Nitrile Rubber (NBR) | -30°C to +100°C | Mineral hydraulic oils | |
| FKM (Viton® Equivalent) | -20°C to +200°C | High-temperature or chemically aggressive media |
Need assistance selecting a material? XHH Seals offers customized solutions based on your specific system requirements.
Technical Specifications
Operating pressure: ≤ 400 bar (6000 psi)
Speed: ≤ 0.5 m/s
Design compatibility: For dynamic rod sealing applications
Surface finish recommendations:
Rod surface: ≤ 0.3 µm Ra
Groove ID: ≤ 1.8 µm Ra
Groove sides: ≤ 3.0 µm Ra
Seal Dimensions & Profiles
Available in both metric and inch series
Double-lip construction enhances performance and durability
Designed for tight extrusion gap tolerances
Fits most standard groove configurations
Custom-machined profiles available upon request
Why Choose XHH Seals?
At XHH Seals, we combine material science with precision engineering to deliver sealing solutions that outperform in demanding environments. Our double-lipped rod U-cup seals are built to last, resist wear, and maintain leak-free operation over extended service intervals. Whether you are an OEM or a maintenance contractor, we provide reliable, export-ready rod sealing solutions tailored to your needs.
“For systems where contamination is not a primary concern, our Standard Rod U-Cup Seal offers excellent sealing performance in a simplified design.”
