NBR 90A O-Ring

High-Hardness NBR O-Rings for Demanding Industrial Sealing Applications

When standard O-rings are not strong enough to handle high pressure, heavy loads, or aggressive operating conditions, NBR 90A O-Rings become the preferred solution.

Manufactured from premium 90 Shore A Nitrile Rubber (NBR), these O-rings provide superior resistance to compression, extrusion, abrasion, mineral oils, hydraulic fluids, and petroleum-based lubricants. Their higher hardness compared to standard 70 Shore A O-rings makes them particularly suitable for hydraulic systems, pneumatic equipment, automotive components, pumps, valves, and industrial machinery.

At Xiamen Jinshun Sealing Technology Co., Ltd., we manufacture both standard and custom NBR 90A O-Rings for global OEMs, distributors, and industrial equipment manufacturers. Since 2002, we have specialized in precision rubber sealing solutions with strict quality control and international material compliance.

The hardness of an O-ring directly affects its ability to withstand pressure and prevent extrusion.

Compared with standard 70 Shore A NBR O-rings, a 90 Shore A compound provides:

• Higher extrusion resistance
• Improved wear resistance
• Better sealing performance under high pressure
• Enhanced dimensional stability
• Longer service life in demanding applications

For hydraulic and pneumatic systems operating above 150 bar, engineers frequently specify 90A NBR O-rings to reduce seal deformation and extend maintenance intervals.

Our manufacturing capabilities cover:

Example Size:

Excellent Oil and Fuel Resistance

NBR remains one of the most widely used sealing materials because of its excellent compatibility with:

• Hydraulic oils
• Mineral oils
• Lubricating greases
• Diesel fuel
• Gasoline
• Transmission fluids

This makes NBR 90A O-rings ideal for hydraulic cylinders, pumps, compressors, and automotive systems.

Superior Extrusion Resistance

High-pressure systems can force softer O-rings into sealing gaps, causing premature failure.

The increased hardness of a 90 Shore A compound significantly reduces:

• Seal extrusion
• Edge damage
• Compression deformation
• Leakage risks

This is particularly important in:

• Hydraulic valves
• High-pressure pumps
• Construction equipment
• Industrial machinery

Long Service Life

NBR 90A compounds offer:

• High wear resistance
• Excellent tear strength
• Good resilience
• Reduced maintenance frequency

For equipment manufacturers, this translates into lower warranty claims and improved equipment reliability.

Our NBR 90A O-Rings are widely used in:

Hydraulic Equipment

• Hydraulic cylinders
• Hydraulic valves
• Pumps
• Power units

Automotive Industry

• Fuel injectors
• Oil systems
• Brake components
• Steering systems

Industrial Machinery

• Pneumatic equipment
• Compressors
• Industrial valves
• Gearboxes

Water Treatment Equipment

• Filter housings
• RO systems
• Pressure vessels
• Pump sealing systems

For hydraulic and oil-based applications, NBR 90A often provides the best balance between performance and cost.

Xiamen Jinshun Sealing Technology provides complete OEM and ODM support, including:

• Custom sizes
• Custom hardness
• Custom colors
• Special compounds
• FDA-grade NBR options
• Low-temperature NBR compounds
• High-pressure sealing solutions
• Prototype development
• Private label production

Our engineering team works directly with customers to optimize sealing performance while controlling production costs.

Every NBR 90A O-Ring is produced under strict quality systems:

Established in 2002, Xiamen Jinshun Sealing Technology has become a trusted supplier of custom rubber sealing products for customers across Europe, North America, Australia, Southeast Asia, and the Middle East.

Our strengths include:

• More than 20 years of manufacturing experience
• Advanced rubber compounding technology
• Precision molding capability
• Fast tooling development
• Stable OEM supply chain
• Competitive factory-direct pricing
• Engineering support from design to production

Whether you need a few prototype seals or millions of production parts, we can provide reliable sealing solutions tailored to your application.

What does 90A mean in an NBR 90A O-Ring?

90A refers to the Shore A hardness of the nitrile rubber. A 90 Shore A O-ring is significantly harder than a standard 70 Shore A O-ring, providing improved extrusion and wear resistance.

When should I choose a 90 Shore A O-Ring instead of 70 Shore A?

A 90A O-ring is recommended for high-pressure hydraulic systems, heavy-duty industrial equipment, and applications where extrusion resistance is critical.

Are NBR 90A O-Rings resistant to oil?

Yes. NBR offers excellent resistance to petroleum oils, hydraulic fluids, lubricants, diesel, and many fuels.

Can you manufacture custom NBR 90A O-Rings?

Yes. We provide fully customized O-rings based on drawings, samples, or specific application requirements.

What is the temperature range of NBR 90A O-Rings?

Typical operating temperatures range from -30°C to +120°C, depending on the compound formulation.

Do you provide FDA-compliant NBR O-Rings?

Yes. FDA-grade NBR compounds are available for food processing, drinking water, and beverage applications.

Request A Free Quote For Custom NBR 90A O-Rings

Looking for a reliable NBR 90A O-Ring manufacturer in China?

Xiamen Jinshun Sealing Technology provides high-performance custom nitrile O-rings, hydraulic seals, industrial sealing rings, and OEM rubber components for global manufacturers and distributors.

Send us your drawing, sample, or technical requirements today. Our engineering team will recommend the most suitable NBR compound and provide a competitive quotation within 24 hours.

Our Services

✓ Custom NBR 90A O-Rings
✓ OEM & ODM Manufacturing
✓ Hydraulic Seal Solutions
✓ FDA & NSF Compliant Materials
✓ Fast Tooling Development
✓ Global Export Support
✓ Factory Direct Pricing

Contact us now to discuss your next sealing project and receive free engineering consultation.