U125-0.500-250B is a 92 AU Polyurethane symmetric U-Cup seal sized 0.500"ID X 0.750"OD X 0.250"HT for hydraulic rod or piston sealing.
This U125-0.500-250B Polyurethane U-Cup helps stop hydraulic leaks, restore cylinder sealing performance, and reduce downtime during hydraulic cylinder repair. Its symmetric U-Cup profile allows it to be used as a universal rod or piston seal when the gland design matches the seal dimensions.
Made from 92 AU 9250 Polyurethane, this seal is designed for customers who need a durable hydraulic seal with good wear resistance, extrusion resistance, and dependable sealing in reciprocating hydraulic applications. The uploaded reference also notes that these U-Series seals are treated as unloaded polyurethane U-Cups and that universal rod or piston U-Cups should be identified by seal ID, cross-section, and height for cleaner customer selection.
Operating Temperature
Operating temperature: -35° to +176°F (-35° to +80°C)
Material & Performance Details
This seal is made from 92 AU 9250 Polyurethane, a high-performance urethane material commonly used in hydraulic cylinder sealing where abrasion resistance, wear life, and sealing strength matter.
The symmetric U-Cup profile is designed with sealing lips on both sides of the profile, allowing the seal to function in rod or piston applications depending on groove design and pressure direction. This helps repair shops and maintenance teams reduce wrong-part orders by matching the seal by ID, OD, HT, and profile.
- Excellent resistance to:
- Abrasion and wear
- Hydraulic oil sealing applications
- Extrusion under proper gland design
- Reciprocating hydraulic movement
- Compression and lip wear compared with softer rubber profiles
- Limited capability with:
- Water-based fluids depending on temperature and concentration
- High-speed applications
- Applications outside the recommended gland design
- Not compatible with:
- Fluids that attack Polyurethane
- High-temperature applications above the material rating
- Unknown fluids without compatibility review
Final compatibility should be verified against the hydraulic fluid, pressure, temperature, and equipment conditions.
Sizes & Measurements
- Dimensions: 1/2"ID X 3/4"OD X 1/4"HT
- Actual: 0.500"ID X 0.750"OD X 0.250"HT
- Metric: 12.70mm ID X 19.05mm OD X 6.35mm HT
- Part Number: U125-0.500-250B
- Profile: SYM-005
- Seal Type: Symmetric U-Cup
- Rod Size: 1/2"
- Bore Size: 3/4"
- Cross Section: 1/8"
- Height: 1/4"
- Cross References:
- SYM-005
- DISOGRIN 005 Series
- 12.70 X 19.05 X 6.30mm
- 0.500 X 0.750 X 0.250 in
Applications & Use Cases
This Polyurethane symmetric U-Cup is used in hydraulic cylinders where a reliable rod or piston seal is needed. It is a strong fit for hydraulic repair shops, MRO teams, equipment rebuilders, and maintenance departments that need to stop leaks and get equipment back into service fast.
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 maintenance
The customer value is simple: better fit identification, fewer leaks, faster repairs, and more confidence when ordering a replacement hydraulic seal.
Key Specifications
- Material: Polyurethane
- Durometer: 92 AU
- Color: Not specified
- Seal Type: Symmetric U-Cup
- Profile: SYM-005
- Application: Hydraulic cylinder rod or piston sealing
- Rod or Bore Use: Rod or piston use depending on gland design
- Temperature Range: -35° to +176°F (-35° to +80°C)
- Pressure Rating: Not specified
- Surface Speed: Not specified
- Fluid Compatibility: Petroleum-based hydraulic fluids commonly used with Polyurethane, final compatibility must be verified
- Certifications: Not specified
- Country of Origin: Not specified
- Brand or Manufacturer: DISOGRIN
Why Buy from The O-Ring Store LLC
The O-Ring Store LLC makes it easier to get the right hydraulic seal the first time. We are ISO9001:2015 certified, stock hydraulic seals in the USA for fast delivery, and offer same-day shipping on in-stock items when possible. Our team helps identify seals by size, profile, material, and application so customers can avoid wrong-part orders and reduce downtime.
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?
Measure the seal ID, OD, and HT, then compare them to the gland and hardware. This seal measures 0.500"ID X 0.750"OD X 0.250"HT. Also confirm the rod size, bore size, groove depth, groove width, and seal profile. Photos of the old seal and groove help confirm the correct replacement.
FAQ 2: Can this seal be used as both a rod seal and piston seal?
Yes, this is a symmetric U-Cup style, so it may work as either a rod seal or piston seal. Final use depends on the cylinder design, pressure direction, and gland dimensions.
FAQ 3: What information should I provide before ordering?
Please provide the ID, OD, HT, material, fluid, temperature, pressure, rod or piston use, equipment type, and photos if available. This helps us confirm the right seal and reduce the chance of ordering the wrong part.
