O-Ring 66.04x5.33 NBR 70 Shore A Rubber Seal

What Is the O-Ring 66.04x5.33 NBR 70 Shore A?

The O-Ring 66.04x5.33 NBR 70 Shore A is a precision-engineered industrial sealing ring manufactured from NBR (Nitrile Butadiene Rubber, Buna-N). Designed for both static and dynamic sealing applications, it offers excellent resistance to mineral oils, lubricating greases and many petroleum-based industrial fluids. With an inside diameter of 66.04 mm and a 5.33 mm cross section, this O-ring is widely used in hydraulic systems, pneumatic equipment, pumps, valves and industrial machinery where reliable sealing performance is essential. The dimensions correspond to the AS568-334 size standard.

Why Choose NBR 70 Shore A?

NBR is the most widely used elastomer for industrial sealing because of its balanced mechanical and chemical properties.

Key advantages include:

• Excellent resistance to mineral oils
• Good compatibility with lubricating greases
• High abrasion resistance
• Good mechanical strength
• Excellent elasticity
• Reliable dimensional stability
• Cost-effective sealing solution

The 70 Shore A hardness provides an excellent balance between flexibility and compression resistance, making it suitable for most industrial sealing applications.

Technical Specification

Material: NBR (Nitrile Butadiene Rubber, Buna-N)

Hardness: 70 Shore A

Inside Diameter: 66.04 mm

Cross Section: 5.33 mm

Profile: Round

Colour: Black

Dimensional Standard: AS568-334

Temperature Range: Suitable for standard NBR operating conditions

Chemical Resistance: Mineral oils, lubricating greases and many petroleum-based industrial fluids

How Does an O-Ring Work?

An O-ring seals by being compressed between two mating surfaces.

Its elastic deformation creates a reliable sealing barrier that:

• Prevents fluid leakage
• Prevents gas leakage
• Blocks contamination
• Maintains system pressure
• Improves equipment reliability

Its simple yet highly efficient design makes the O-ring one of the most commonly used sealing solutions in industrial engineering.

Typical Applications

The O-Ring 66.04x5.33 NBR 70 Shore A is commonly used in:

• Hydraulic systems
• Pneumatic systems
• Pumps
• Valves
• Hydraulic cylinders
• Pneumatic actuators
• Industrial machinery
• Manufacturing equipment
• Agricultural machinery
• Industrial automation
• OEM manufacturing
• Industrial MRO maintenance

How to Select the Correct O-Ring

When selecting an O-ring, consider:

• Inside diameter
• Cross-section diameter
• Sealing material
• Operating temperature
• Working fluid
• System pressure
• Groove dimensions
• Installation method

Choosing the correct dimensions and material is essential for reliable sealing performance and long service life.

Installation Recommendations

For optimum sealing performance:

• Clean all sealing surfaces before installation.
• Inspect the sealing groove for damage.
• Lubricate the O-ring if required.
• Avoid twisting during assembly.
• Use suitable installation tools.
• Prevent mechanical damage during fitting.

Correct installation significantly extends seal service life.

OEM Manufacturing and Industrial Maintenance

NBR O-rings are widely used in OEM production and industrial maintenance because they provide dependable sealing performance across a wide range of machinery.

They help:

• Prevent leakage
• Improve equipment reliability
• Extend component life
• Reduce maintenance costs
• Minimize machine downtime
• Support preventive maintenance programs

Their versatility makes them a standard sealing solution throughout industrial engineering.

Why Engineers Choose NBR O-Rings

• Excellent oil and grease resistance
• Standard 70 Shore A hardness
• Reliable static and dynamic sealing
• High abrasion resistance
• Easy installation
• Long service life
• Suitable for OEM manufacturing
• Excellent for industrial MRO applications

Frequently Asked Questions (FAQ)

What does 66.04x5.33 mean?

It specifies an inside diameter of 66.04 mm and a 5.33 mm cross-section diameter. This size corresponds to AS568-334.

Is NBR resistant to mineral oils?

Yes. NBR provides excellent resistance to mineral oils, lubricating greases and many petroleum-based industrial fluids.

Is 70 Shore A a standard hardness?

Yes. 70 Shore A is the most common hardness used for general-purpose industrial O-rings.

Where is this O-ring commonly used?

It is widely installed in hydraulic systems, pneumatic equipment, pumps, valves, industrial machinery, OEM equipment and maintenance applications.

Can this O-ring be used for dynamic sealing?

Yes. When properly designed and installed, NBR O-rings are suitable for both static and selected dynamic sealing applications.

How should NBR O-rings be stored?

Store them in a cool, dry environment away from direct sunlight, ozone and excessive heat to preserve their sealing properties.