AN6226-12 Buna-N 70 U-Cup Seal 1/2" ID X 1" OD X 1/4" CS


Qty Discounts Prices
10-189
$0.530		 190-5,399
$0.265		 5,400-16,999
$0.185		 17,000+
$0.148

$0.530

  • Model: 6226-12
    Dimensions: 1/2" ID X 1" OD X 1/4" CS
    Actual: 0.500" ID X 1.000" OD X 0.250" CS
    Metric: 12.70 mm ID X 25.40 mm OD X 6.35 mm CS
  • 7781 in Stock
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Made from black Buna-N (NBR) at 70 durometer, this U-Cup provides excellent oil resistance and durability. The 1/4" square profile adds stability and sealing strength, making it a dependable choice for demanding fluid power systems.

Get a strong, stable seal that keeps your system running without leaks or interruptions. The AN6226-12 U-Cup Seal is designed for reliable performance in hydraulic and pneumatic applications, helping you reduce downtime and maintain consistent operation.

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

Material & Performance Details

This U-Cup is manufactured from Buna-N (Nitrile, NBR), a widely trusted material in the sealing industry. The 70 durometer hardness offers a balanced combination of flexibility and long-term durability.

The AN6226 design features a square cross section where the nominal cross section equals the height, providing improved sealing stability and consistent 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): 1/2" (0.500" | 12.70 mm)
  • Outside Diameter (OD): 1" (1.000" | 25.40 mm)
  • Part Number: AN6226-12
  • Cross References:
    • Parker Hannifin: 42956226-12
    • Hercules: 870-12
    • Martin Fluid Power: 6226-12
    • Precision Associates: 6226-12

Dimensions: 1/2" ID X 1" OD X 1/4" CS
Actual: 0.500" ID X 1.000" OD X 0.250" CS
Metric: 12.70 mm ID X 25.40 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 that require 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.

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.