Buna O Rings: Everything You Need to Know

Buna o rings are among the most widely used sealing solutions in industrial applications, offering excellent resistance to oils and chemicals. But how do you choose the right one? This guide covers everything you need to know.

Buna o rings are made from nitrile rubber, known for their durability and resistance to oil, water, and certain chemicals. They come in various sizes and types, making them suitable for a wide range of applications.

What are buna o rings?

Buna o rings, also known as buna rubber o rings, are sealing rings made from nitrile rubber (NBR). They are commonly used in applications requiring resistance to petroleum-based fluids and certain chemicals.

Buna o rings are preferred in industries such as automotive, hydraulics, and pneumatics due to their excellent oil and abrasion resistance. They provide reliable sealing performance in environments where rubber degradation is a concern.

What is the difference between buna and Viton o rings?

Buna and Viton o rings differ in material composition and resistance to different environmental conditions.

Buna o rings are ideal for applications involving petroleum-based fluids, while Viton o rings are better suited for high temperatures and aggressive chemicals.

What are the common sizes of buna o rings?

Buna o rings are available in various standard sizes. The most commonly used buna o ring size chart follows AS568 standards, including:

• AS568-110 (ID: 0.239", CS: 0.070")
• AS568-214 (ID: 0.737", CS: 0.139")
• AS568-325 (ID: 2.487", CS: 0.210")

If you need to know specific metric sizes? Check our
Metric Buna O-Rings Size Guide to find the exact dimensions you need.

For custom applications, manufacturers like Hengoseal offer customized buna o rings to fit specific needs.

Applications of buna o rings

Buna o rings are widely used across various industries due to their oil resistance and durability. Common applications include:

• Automotive: Used in fuel systems, engines, and transmissions.
• Hydraulics & Pneumatics: Provides reliable sealing in hydraulic cylinders and pneumatic actuators.
• Industrial Machinery: Prevents fluid leakage in pumps, compressors, and valves.
• Oil & Gas: Utilized in sealing applications for pipelines and drilling equipment.
• Food & Beverage: FDA-grade buna o rings are used in food processing equipment.

Their versatility makes them a popular choice for industrial sealing applications.

Not sure whether to choose Buna or Nitrile O-rings? Read our detailed comparison of
Buna vs. Nitrile O-Rings to find out the best option for your application!

How to select the right buna o ring?

Choosing the right buna o ring depends on factors such as size, temperature resistance, and application environment.

What is the temperature range of buna o rings?

Buna o rings have a temperature range of -40°F to 250°F (-40°C to 121°C), making them ideal for applications exposed to moderate temperature variations.

For extreme temperatures, alternative materials like Viton or silicone o rings should be considered.

Are buna o rings suitable for hydraulic systems?

Yes, buna o rings are widely used in hydraulic systems due to their excellent resistance to hydraulic oils and wear. They provide effective sealing in cylinders, pumps, and valves, preventing fluid leaks and ensuring system efficiency.

Where to buy buna o rings?

For high-quality buna o rings, Hengoseal is your trusted supplier. We offer:

• Customizable o rings for various applications.
• Competitive factory pricing with low MOQ.
• Fast delivery worldwide.

Contact us today:
📧 Email: [email protected]
📞 WhatsApp: +86 17622979498
🌐 Visit: hengoseal.com

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Ready to order high-quality buna o rings? Visit hengoseal.com or contact us today!