Manufactured from black Buna-N (NBR) at 70 durometer, this U-Cup provides excellent oil resistance and durability. The larger 1/4" cross section offers added stability, making it a strong choice for applications where consistent sealing and longer service life are critical.
Get a stable, high-performing seal that holds up under pressure and keeps your system leak-free. The AN6226-10 U-Cup Seal is designed to deliver consistent sealing, reduce downtime, and keep your hydraulic and pneumatic equipment operating smoothly.
Operating temperature: -40° to +225°F (–40° to +107°C)
Material & Performance Details
This seal is made from Buna-N (Nitrile, NBR), one of the most widely used sealing materials in fluid power systems. With a 70 durometer hardness, it provides a balanced combination of flexibility and durability.
The AN6226 profile features a square-style cross section where the nominal cross section equals the height, providing improved stability and consistent sealing performance.
Excellent resistance to:
- Petroleum-based oils and fuels
- Hydraulic fluids
- Mineral oils and greases
- Water (short-term exposure)
Limited capability with:
- Mild acids and bases
- Ozone and outdoor exposure
Not compatible with:
- Strong acids
- Brake fluids (glycol-based)
- Aromatic hydrocarbons
Sizes & Measurements
- Cross Section (CS): 1/4" (0.250" | 6.35 mm)
- Inside Diameter (ID): 3/8" (0.375" | 9.53 mm)
- Outside Diameter (OD): 7/8" (0.875" | 22.23 mm)
- Part Number: AN6226-10
- Cross References:
- Parker Hannifin: 42956226-10
- Hercules: 870-10
- Martin Fluid Power: 6226-10
- Precision Associates: 6226-10
Dimensions: 3/8" ID X 7/8" OD X 1/4" CS
Actual: 0.375" ID X 0.875" OD X 0.250" CS
Metric: 9.53 mm ID X 22.23 mm OD X 6.35 mm CS
Applications & Use Cases
This AN6226 Series U-Cup is commonly used in hydraulic cylinders, pneumatic systems, pumps, and valves. It is ideal for applications requiring reliable sealing with low friction and consistent performance.
With a pressure rating up to 500 PSI, it is well suited for both OEM equipment and maintenance applications, including systems that rely on AN-standard seals.
Key Specifications
- Material: Buna-N (NBR)
- Durometer: 70 Shore A
- Color: Black
- Specification: AN6226 (Army-Navy Standard)
- Temperature Range: -40°F to +225°F (-40°C to +107°C)
- Pressure Rating: Up to 500 PSI
Why Buy from The O-Ring Store LLC
When you order from us, you are getting more than just a seal. You are getting accuracy, speed, and support that helps you avoid downtime and rework.
- ISO9001:2015 certified quality processes
- USA stock for fast delivery
- Same-day shipping on in-stock items
- Custom sizes available when standard sizes do not fit
- Full lot traceability and documentation available
- Technical support from experienced staff
- Competitive pricing without sacrificing quality
We focus on helping you get the right seal the first time so your equipment keeps running.
FAQs
1. What does AN6226 mean?
AN6226 is an Army-Navy specification that standardizes U-Cup seal dimensions and ensures interchangeability.
2. Is Buna-N suitable for hydraulic systems?
Yes. Buna-N offers excellent resistance to petroleum-based oils and hydraulic fluids.
3. What pressure can this seal handle?
This U-Cup is rated for applications up to 500 PSI.
