AN6226-50 Buna-N 70 U-Cup Seal 7/8" ID X 1-1/4" OD X 5/32" CS

Get a dependable seal that balances flexibility and durability for smooth, consistent performance. The AN6226-50 U-Cup Seal is designed to prevent leaks, reduce downtime, and keep your hydraulic and pneumatic systems operating efficiently.

Manufactured from black Buna-N (NBR) at 70 durometer, this U-Cup provides excellent oil resistance and long service life. The 5/32" cross section offers a balanced sealing profile, making it ideal for applications that require responsiveness without sacrificing stability.

Operating temperature: -40° to +225°F (–40° to +107°C)

Material & Performance Details

This seal is made from Buna-N (Nitrile, NBR), a widely trusted sealing material in fluid power systems. The 70 durometer hardness provides a strong balance between flexibility and durability.

The AN6226 design features a square-style cross section where the nominal cross section equals the height, ensuring consistent sealing performance across a wide range of applications.

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): 5/32" (0.156" | 3.96 mm)
• Inside Diameter (ID): 7/8" (0.875" | 22.23 mm)
• Outside Diameter (OD): 1-1/4" (1.250" | 31.75 mm)
• Part Number: AN6226-50
• Cross References:
  • Parker Hannifin: 42956226-50
  • Hercules: 870-50
  • Martin Fluid Power: 6226-50
  • Precision Associates: 6226-50

Dimensions: 7/8" ID X 1-1/4" OD X 5/32" CS
Actual: 0.875" ID X 1.250" OD X 0.156" CS
Metric: 22.23 mm ID X 31.75 mm OD X 3.96 mm CS

Applications & Use Cases

This AN6226 Series U-Cup is commonly used in hydraulic cylinders, pneumatic systems, pumps, and valves where moderate sealing strength and flexibility are required. It is ideal for applications that benefit from smooth operation and consistent sealing.

With a pressure rating up to 500 PSI, it is a dependable solution for both OEM equipment and maintenance applications.

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 is the benefit of a 5/32" cross section?
It provides a balance between flexibility and sealing strength, allowing smoother operation in dynamic applications.

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.