Reliable Hydraulic Sealing That Reduces Leaks and Downtime
If you are running hydraulic cylinders and need a seal that holds pressure, reduces leakage, and protects your equipment, this twin lip rod U-Cup is built for it. Designed with an asymmetrical profile, it delivers strong sealing force while maintaining low friction on the rod.
Built from high-performance 92 AU 9250 polyurethane, this seal gives you longer service life, better wear resistance, and fewer maintenance interruptions. The twin lip design improves stability and keeps contaminants out, helping your system run cleaner and longer.
Operating temperature: -40° to +225°F (–40° to +107°C)
Material & Performance Details
This seal is part of the D300 series using Disogrin polyurethane, a proven compound for demanding hydraulic applications. According to the manufacturer datasheet, this material provides excellent wear resistance, no adhesion after long standstill, and strong extrusion resistance .
- Material: Polyurethane (92 AU 9250)
- Durometer: 92 Shore A
- Color: Green / Natural
Performance strengths:
- Twin lip design for improved sealing and stability
- Excellent abrasion and wear resistance
- High extrusion resistance under pressure
- Low compression set for long sealing life
- Secondary sealing edge helps block contamination and stabilize the seal
Chemical compatibility:
Excellent resistance to:
- Petroleum-based hydraulic oils
- Greases
- Mineral oils
Limited capability with:
- Water-glycol fluids
- Mild chemicals depending on concentration
Not compatible with:
- Strong acids
- Strong bases
- High-temperature steam
Sizes & Measurements
- Dimensions: 1-1/2" ID X 1-7/8" OD X 5/16" HT
- Actual: 1.500" ID X 1.875" OD X 0.310" HT
- Metric: 38.10 mm ID X 47.62 mm OD X 7.80 mm HT
- Part Number: RTU187-1.500-312B
- Series: D300 Rod Seal
- FST Item No.: 71302874
Applications & Use Cases
This rod seal is designed for hydraulic rod sealing where pressure retention and contamination control are critical. The asymmetrical twin lip design makes it ideal for:
- Hydraulic cylinders in construction equipment
- Agricultural machinery
- Forklifts and material handling equipment
- Industrial presses and automation systems
- Mobile hydraulic systems
The secondary lip improves sealing even at low pressure and helps prevent dirt ingress, increasing overall system life.
Key Specifications
- Material: Polyurethane (92 AU 9250)
- Durometer: 92 Shore A
- Color: Green / Natural
- Temperature Range: -40°F to +225°F (–40°C to +107°C)
- Pressure Capability: Up to 6000 PSI depending on application
- Speed: Up to 1.5 ft/s (0.5 m/s)
- Brand: Freudenberg
- Country of Origin: Mexico
Why Buy from The O-Ring Store LLC
When you buy from us, you are getting more than a seal. You are getting a partner focused on keeping your equipment running.
- ISO9001:2015 certified processes for consistent quality
- USA stock for fast delivery
- Same-day shipping on in-stock items
- Full lot traceability available on request
- Experienced team that understands hydraulic sealing
- Competitive pricing without sacrificing performance
We focus on accuracy, speed, and making sure you get the right seal the first time.
Frequently Asked Questions
1. What is the advantage of a twin lip rod seal?
The twin lip design improves sealing performance, increases stability, and adds protection against contamination, especially in dynamic hydraulic systems.
2. Can this seal handle high-pressure hydraulic systems?
Yes, it is designed for hydraulic use and can handle high pressure depending on system design, clearances, and operating conditions.
3. Is polyurethane better than rubber for rod seals?
In most hydraulic applications, yes. Polyurethane offers better wear resistance, higher strength, and longer service life than standard rubber materials.
