NBR O Ring

Key Features

Excellent Sealing Capabilities
Resistance to Petroleum-Based Oils
Low Compression Set
High Tensile Strength
High Abrasion Resistance
Low Gas Permeability
Good Heat Resistance

NBR O rings, also commonly referred to as nitrile O rings or Buna N O rings, are indispensable components in sealing applications across various industries worldwide. We meticulously craft these seals from NBR (acrylonitrile butadiene rubber), representing a pinnacle of engineering excellence. They offer exceptional resistance to oils, fuels, and other petroleum-based fluids. At Exactseal, we take immense pride in our extensive selection of O rings. Each ring is meticulously engineered to deliver reliable sealing solutions for a diverse range of applications.

Nitrile rubber’s robust mechanical properties and wear resistance make NBR O Rings reliable, although they aren’t suitable for high temperatures, ozone, or UV exposure. These O Rings come in diverse hardness levels, measured on the Shore A durometer scale (usually ranging from 70 to 90 Shore A). A higher durometer indicates increased hardness and compression resistance.

Versatility of NBR O Rings

The versatility and durability of NBR O rings make them the go-to choice across industries spanning automotive, manufacturing, and hydraulic systems, among others. Engineered to withstand the harshest operating conditions, NBR O rings exhibit unparalleled resilience against oils, fuels, and hydraulic fluids. The unique composition of Buna N imparts superior compression set resistance. This ensures optimal performance in both static and dynamic sealing applications, thereby enhancing operational efficiency and minimizing downtime.

Customized NBR O Ring Solutions

At Exactseal, we recognize that one size does not fit all when it comes to sealing solutions. That’s why we offer tailored O ring solutions meticulously crafted to meet your specific needs and requirements. Whether you require standard NBR70 O rings or bespoke O rings engineered for specialized applications, our team of seasoned engineers and technicians works tirelessly to develop solutions that address your unique sealing challenges. We leverage our expertise in material selection, design optimization, and advanced manufacturing techniques. This enables us to create O rings precisely aligned with your specifications and performance criteria. This ensures seamless integration and reliable sealing performance.

Ensuring a Reliable Seal with NBR O Rings

Reliability is paramount when it comes to sealing applications. NBR O rings excel in delivering consistent and dependable performance even in the most demanding environments. With their exceptional resistance to oils, fuels, and hydraulic fluids, NBR O rings play a pivotal role in preventing leaks and maintaining the integrity of your systems and equipment. Our commitment to quality is unwavering. Therefore, each O ring undergoes rigorous testing and inspection to ensure adherence to the highest standards of performance and reliability. This provides you with the confidence to tackle challenging sealing applications with ease.

Why Choose Exactseal?

High-Quality NBR Material: We craft our O Rings from premium-grade NBR rubber. This ensures outstanding resistance to oils, fuels, and hydraulic fluids, as well as exceptional durability and longevity.

Customization Options: We understand that every application is unique. That’s why we offer a comprehensive range of customization options for O rings. This includes standard NBR70 sizes and bespoke dimensions tailored to your specific requirements.

Versatile Applications: From automotive and manufacturing to hydraulic systems and beyond, NBR O rings find application in a diverse array of industries. This underscores their versatility, reliability, and wide-ranging utility.

Expertise: With decades of experience in O ring manufacturing, our team boasts unparalleled expertise. We are dedicated to delivering superior sealing solutions tailored to your unique needs. This is backed by unparalleled customer support and technical assistance.


ApplicationGeneral Purpose
Product NameNBR O-Ring
Hardness (Shore A)Typically around 70, but can range from 40 to 90
MaterialNitrile / NBR


Low Temperature Military Applications
Off-Roading Equipment Sealing
Marine Devices Sealing
Aircraft Fuel Systems Sealing
Automotive Industry Sealing
Oil Applications of Any Kind

Technical Information

MaterialNitrile / NBR
Working Temperature Range (°F)-40 to 257
Additional Temperature Range (°F)-85 to 275
ResistancePetroleum-based oils and fuels, silicone greases, hydraulic fluids, water and alcohols
Mechanical PropertiesLow compression set, high tensile strength, high abrasion resistance, low gas permeability
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