RTU125-1.250-250B is a 92A Polyurethane twin lip U-Cup rod seal used to help stop hydraulic cylinder leakage, restore rod sealing performance, and reduce downtime during cylinder repair. This seal is built for 1-1/4" rod applications where a reliable rod seal is needed to retain hydraulic fluid and keep equipment working.
RTU125-1.250-250B is a Disogrin D-300 Rod Seal Series profile. The twin lip design gives repair shops, maintenance teams, and hydraulic rebuilders a dependable sealing option when replacing worn or leaking rod seals in hydraulic cylinders.
Operating Temperature
Operating temperature: -22° to +212°F (-30° to +100°C)
Material & Performance Details
This rod seal is made from 92 AU 9250 Polyurethane. Polyurethane is commonly used in hydraulic sealing because it offers strong wear resistance, abrasion resistance, and extrusion resistance compared to many standard rubber sealing materials.
The twin lip U-Cup profile is designed for hydraulic rod sealing. The sealing lips help maintain contact on the rod and gland surfaces, supporting better fluid control and improved sealing reliability in demanding cylinder repairs.
Final compatibility should be verified against the hydraulic fluid, pressure, temperature, and equipment conditions.
Excellent resistance to:
- Abrasion and wear in hydraulic cylinder service
- Extrusion under properly designed gland conditions
- Petroleum-based hydraulic fluid applications, when confirmed suitable
- Dynamic rod sealing wear
Limited capability with:
- High-temperature applications beyond the material rating
- Specialty fluids unless compatibility is verified
- Applications with damaged rods, rough surfaces, or poor gland condition
Not compatible with:
- Fluids or temperatures not approved for the material
- Incorrect gland sizes or worn cylinder hardware
Sizes & Measurements
- Dimensions: 1-1/4"ID X 1-1/2"OD X 1/4"HT
- Actual: 1.250"ID X 1.500"OD X 0.250"HT
- Metric: 31.75mm ID X 38.10mm OD X 6.30mm HT
- Part Number: RTU125-1.250-250B
- Profile: D300
- Seal Type: Twin Lip U-Cup Rod Seal
- Rod Size: 1.250"
- Bore Size: Not specified
- Groove Width: Not specified
- Groove Depth: Not specified
- Height: 0.250"
- Cross References: Disogrin D-300 Rod Seal Series
- Alternate Part Numbers: Not specified
Applications & Use Cases
RTU125-1.250-250B is used in hydraulic cylinders where the rod seal helps retain hydraulic fluid and prevent leakage past the rod. It is a good fit for hydraulic repair shops, industrial maintenance, mobile equipment repair, agricultural equipment, construction equipment, forklifts, presses, dump trailers, log splitters, pumps, and other cylinder rebuild work.
The customer value is simple. A correct fitting rod seal helps reduce leaks, improves cylinder performance, lowers equipment downtime, and gives the repair team more confidence that the replacement seal matches the original profile and size.
Key Specifications
- Material: Polyurethane
- Durometer: 92A
- Color: Not specified
- Seal Type: Rod Twin Lip U-Cup
- Profile: D300
- Application: Hydraulic rod sealing
- Rod or Bore Use: Rod seal
- Temperature Range: Not specified
- Pressure Rating: Not specified
- Surface Speed: Not specified
- Fluid Compatibility: Not specified
- 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 helps customers get the right hydraulic seal without wasting time on wrong-part orders. Our ISO9001:2015 certified quality processes support accurate order handling, traceability, and dependable 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, and application. We also support custom and hard-to-find seal sizes, lot traceability and documentation on request, and competitive pricing without cutting quality. We make getting O-Rings and hydraulic seals easy.
3 Most Common FAQs
How do I know if this hydraulic seal will fit my cylinder?
Measure the seal and gland carefully. For RTU125-1.250-250B, confirm the 1.250"ID, 1.500"OD, and 0.250"HT. Also confirm the rod size, gland width, gland depth, and seal profile. This part is listed as a D300 twin lip rod seal, so the profile should match the original rod seal design.
Can this seal be used as both a rod seal and piston seal?
No. This part is listed as a Rod Twin Lip U-Cup and is intended for rod sealing. It should not be treated as a universal rod and piston seal unless the cylinder design and gland dimensions specifically support that use.
What information should I provide before ordering?
Provide the seal dimensions, rod size, bore or gland information, material if known, hydraulic fluid, temperature, pressure, equipment type, and whether the seal is used on the rod or piston. Photos of the old seal and gland are also helpful when confirming the correct replacement.
