AN6226-05 Buna-N 70 U-Cup Seal 3/8" ID X 3/4" OD X 3/16" CS


Qty Discounts Prices
15-259
$0.380		 260-7,499
$0.190		 7,500-23,999
$0.133		 24,000+
$0.106

$0.380

  • Model: 6226-05
    Dimensions: 3/8" ID X 3/4" OD X 3/16" CS
    Actual: 0.375" ID X 0.750" OD X 0.187" CS
    Metric: 9.53 mm ID X 19.05 mm OD X 4.75 mm CS
  • 138 in Stock
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Get reliable sealing performance without overcomplicating your system. The AN6226-05 U-Cup Seal is built to prevent leaks, reduce downtime, and keep your hydraulic and pneumatic equipment operating smoothly.

Manufactured from black Buna-N (NBR) at 70 durometer, this seal offers excellent oil resistance and flexibility. It is a proven, cost-effective solution for customers who need dependable sealing in fluid power applications.

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

Material & Performance Details

This U-Cup is made from Buna-N (Nitrile, NBR), one of the most widely used sealing materials in the industry. The 70 durometer hardness provides a strong balance between flexibility for sealing and durability for long service life.

U-Cups are designed to energize under pressure, reducing the need for high initial compression and allowing for smooth operation.

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 weather exposure

Not compatible with:

  • Strong acids
  • Brake fluids (glycol-based)
  • Aromatic hydrocarbons

Sizes & Measurements

  • Cross Section (CS): 3/16" (0.187" | 4.75 mm)
  • Inside Diameter (ID): 3/8" (0.375" | 9.53 mm)
  • Outside Diameter (OD): 3/4" (0.750" | 19.05 mm)
  • Part Number: AN6226-05
  • Cross References:
    • Parker Hannifin: 42956226-05
    • Hercules: 870-05
    • Martin Fluid Power: 6226-05
    • Precision Associates: 6226-5

Dimensions: 3/8" ID X 3/4" OD X 3/16" CS
Actual: 0.375" ID X 0.750" OD X 0.187" CS
Metric: 9.53 mm ID X 19.05 mm OD X 4.75 mm CS

Applications & Use Cases

This AN6226 Series U-Cup is widely used in hydraulic cylinders, pneumatic tools, 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 a dependable option for both OEM systems and maintenance repairs.

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 costly mistakes and delays.

  • 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
  • Experienced technical support
  • Competitive pricing without compromising quality

We focus on helping you get the right seal the first time so your operation keeps moving.

FAQs

1. What does AN6226 mean?
AN6226 is an Army-Navy specification that standardizes U-Cup seal sizes and ensures interchangeability.

2. Is Buna-N suitable for hydraulic systems?
Yes. Buna-N provides 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.