UL250-2.000-250B is a polyurethane loaded B-Lip U-Cup seal with a Buna-N O-Ring energizer for hydraulic rod or piston sealing in 2" ID applications.
Stop hydraulic leaks, restore cylinder performance, and reduce downtime with the UL250-2.000-250B High Performance Loaded B-Lip U-Cup Seal. This seal uses a durable polyurethane body with a Buna-N O-Ring energizer to improve sealing force and help maintain contact under changing pressure conditions.
This loaded U-Seal is commonly used as a universal rod or piston hydraulic seal, depending on the gland design. The working size is 1/4" cross-section X 2" ID X 1/4" HT, fitting a 2" rod or 2-1/2" bore application based on the referenced build list for loaded U-Cups.
Operating Temperature
Operating temperature: -40° to +230°F (-40° to +110°C)
Material & Performance Details
The UL250-2.000-250B uses a polyurethane seal body for abrasion resistance, wear life, and extrusion resistance in hydraulic service. The Buna-N O-Ring energizer helps load the sealing lips, improving contact in the gland and helping the seal respond during low-pressure and pressure-changing conditions.
The loaded B-Lip U-Cup design is a strong choice when the customer needs better sealing reliability than a standard unloaded U-Cup. It helps reduce leakage, improve cylinder response, and support longer service life in demanding hydraulic repairs.
- Excellent resistance to:
- Petroleum-based hydraulic oils
- Wear and abrasion
- Extrusion under pressure
- General hydraulic cylinder service
- Limited capability with:
- Some synthetic fluids
- High-temperature applications beyond the rated range
- Applications with poor rod or bore surface finish
- Not compatible with:
- Fluids that are not compatible with polyurethane or Buna-N
Final compatibility should be verified against the hydraulic fluid, pressure, temperature, and equipment conditions.
Sizes & Measurements
- Dimensions: 2"ID X 2-1/2"OD X 1/4"HT
- Actual: 2.000"ID X 2.500"OD X 0.250"HT
- Metric: 50.80mm ID X 63.50mm OD X 6.35mm HT
- Part Number: UL250-2.000-250B
- Profile: Loaded B-Lip U-Cup
- Seal Type: High Performance Loaded U-Seal
- Rod Size: 2"
- Bore Size: 2-1/2"
- Cross Section: 0.250"
- Height: 0.250"
- Cross References: NuPac Loaded U-Cups, PolyPaks® style loaded U-Cups
Applications & Use Cases
The UL250-2.000-250B is used in hydraulic cylinders where a loaded U-Cup style seal is needed to control leakage and restore sealing performance. It may be used in rod or piston applications when the cylinder design, groove, and pressure direction match the seal profile.
Typical uses include:
- Hydraulic cylinders
- Rod sealing
- Piston sealing
- Mobile hydraulics
- Agricultural equipment
- Construction equipment
- Dump trailers
- Forklifts
- Log splitters
- Presses
- Pumps and valves
- Industrial repair and MRO
- Hydraulic repair shops
For the customer, the value is simple: fewer leaks, faster repairs, better seal identification, and more confidence when ordering the correct replacement seal.
Key Specifications
- Material: Polyurethane body with Buna-N O-Ring energizer
- Durometer: Not specified
- Color: Not specified
- Seal Type: Loaded U-Cup Seal
- Profile: Loaded B-Lip U-Cup
- Application: Hydraulic cylinder sealing
- Rod or Bore Use: Rod or piston use, depending on cylinder design
- Temperature Range: -40° to +230°F (-40° to +110°C)
- Pressure Rating: 0 to 5,000 PSI
- Surface Speed: Not specified
- Fluid Compatibility: Petroleum-based hydraulic fluid
- Certifications: Not specified
- Country of Origin: Not specified
- Brand or Manufacturer: Not specified
Why Buy from The O-Ring Store LLC
The O-Ring Store LLC helps customers get the right hydraulic seal faster, with less guesswork and fewer wrong-part orders. Our ISO9001:2015 certified quality processes support consistent order handling, traceability, and dependable customer service. We stock hydraulic seals in the USA for fast delivery, offer same-day shipping on in-stock items, and help identify seals by size, profile, material, and application.
We also support custom and hard-to-find sizes, provide lot traceability and documentation on request, and keep pricing competitive without cutting quality. We make getting O-Rings and hydraulic seals easy.
3 Most Common FAQs
FAQ 1: How do I know if this hydraulic seal will fit my cylinder?
Confirm the seal ID, OD, HT, rod size, bore size, groove width, groove depth, and seal profile. This seal measures 2.000"ID X 2.500"OD X 0.250"HT and is commonly matched to a 2" rod or 2-1/2" bore, depending on whether it is used as a rod seal or piston seal.
FAQ 2: Can this seal be used as both a rod seal and piston seal?
This loaded U-Cup style may be used in rod or piston applications when the gland design and pressure direction are correct. Final use depends on the cylinder design, groove dimensions, and application conditions.
FAQ 3: What information should I provide before ordering?
Provide the seal dimensions, material, hydraulic fluid, temperature, pressure, rod or piston use, equipment type, groove size, and photos of the old seal if available. Clear measurements help prevent wrong-part orders and reduce downtime.
