626-010 Buna-N 70A U-Cup Seal 1/4" ID X 3/8" OD X 1/16" CS



Qty Discounts Prices
1-9
$1.720		 10-99
$1.380		 100+
$1.210

$1.720

  • Model: 626-010-5747
    Dimensions: 1/4" ID X 3/8" OD X 1/16" CS
    Actual: 0.250" ID X 0.375" OD X 0.0625" CS
    Metric: 6.35 mm ID X 9.53 mm OD X 1.59 mm CS
  • 520 in Stock
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Stop leaks, restore performance, and keep your equipment running without interruption. The 626-010 Buna-N (Nitrile) 70 durometer U-Cup seal is designed for reliable sealing in dynamic applications where consistent pressure and durability matter. Built from high-quality NBR material, this seal delivers dependable performance in hydraulic and pneumatic systems, helping reduce downtime and maintenance costs.

This black 70A Buna-N U-Cup offers excellent flexibility and sealing efficiency, making it a go-to solution for general-purpose fluid sealing. It performs well in oil-based systems and provides a cost-effective balance of durability and performance for everyday industrial use.

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

Material & Performance Details

Manufactured from Buna-N (NBR) 70 durometer, this U-Cup seal is engineered for strong sealing performance with good resistance to wear and compression set.

Performance strengths:

  • Excellent sealing for dynamic applications
  • Good abrasion resistance
  • Reliable flexibility at standard operating temperatures
  • Cost-effective for high-volume use

Chemical compatibility:

  • Excellent resistance to: Petroleum oils, hydraulic fluids, water, grease
  • Limited capability with: Mild chemicals, ozone exposure
  • Not compatible with: Strong acids, brake fluids, ketones, phosphate esters

Sizes & Measurements

  • 1/4" ID X 3/8" OD X 1/16" CS
  • Actual: 0.250" ID X 0.375" OD X 0.0625" CS
  • Metric: 6.35 mm ID X 9.53 mm OD X 1.59 mm CS
  • Part Number: 626-010
  • Series: HSU Equivalent U-Cup

Applications & Use Cases

This U-Cup seal is commonly used in:

  • Hydraulic cylinders
  • Pneumatic actuators
  • Pumps and valves
  • Light-duty industrial machinery
  • Mobile equipment and repair applications

Its design allows it to energize under pressure, creating a tight seal that improves efficiency and reduces leakage in reciprocating systems.

Key Specifications

  • Material: Buna-N (Nitrile, NBR)
  • Durometer: 70A
  • Color: Black
  • Temperature Range: -40°F to +225°F (–40°C to +107°C)
  • Pressure Rating: Up to 500 PSI (application dependent)
  • Standard: HSU style

Why Buy from The O-Ring Store LLC

When you choose us, you're getting more than just a seal. You're getting a partner focused on keeping your operation running smoothly.

  • ISO9001:2015 certified quality processes
  • USA-based inventory for fast, reliable delivery
  • Same-day shipping on in-stock items
  • Custom sizes and materials available
  • Full lot traceability and documentation upon request
  • Experienced team ready to support your application
  • Competitive pricing without sacrificing quality

We make getting O-Rings easy, and that means less downtime, fewer mistakes, and faster results for you.