What Is the O-Ring 150x3.5 NBR 70 Shore A?

The O-Ring 150x3.5 NBR 70 Shore A is a precision-engineered elastomer sealing ring designed for static and dynamic sealing applications in hydraulic, pneumatic and industrial equipment. Manufactured from NBR (Nitrile Butadiene Rubber, Buna-N) with a hardness of 70 Shore A, it provides reliable sealing performance when used with mineral oils, lubricating greases and many petroleum-based industrial fluids. With an inside diameter of 150 mm and a 3.5 mm cross section, this O-ring is widely used in machinery, pumps, valves and OEM equipment where dependable sealing and long service life are required.

Why Choose NBR 70 Shore A?

NBR is the most widely used sealing material for industrial O-rings 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 offers an excellent balance between flexibility and compression resistance, making it suitable for most standard industrial sealing applications.

Technical Specification

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

Hardness: 70 Shore A

Inside Diameter: 150 mm

Cross Section: 3.5 mm

Profile: Round

Colour: Black

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 deforming elastically between two mating surfaces.

When compressed inside the gland, it creates a reliable sealing barrier that:

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

Its simple geometry makes the O-ring one of the most efficient and widely used sealing solutions in industrial engineering.

Typical Applications

The O-Ring 150x3.5 NBR 70 Shore A is commonly used in:

• Hydraulic systems
• Pneumatic equipment
• Pumps
• Valves
• Hydraulic cylinders
• Pneumatic actuators
• Industrial machinery
• Manufacturing equipment
• Agricultural machinery
• Industrial automation
• OEM production
• 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

Proper O-ring selection significantly improves sealing efficiency and service life.

Installation Recommendations

For maximum sealing performance:

• Clean all sealing surfaces.
• Inspect the groove carefully.
• Lubricate the O-ring before installation.
• Avoid twisting during assembly.
• Use proper installation tools.
• Protect the seal from mechanical damage.

Correct installation helps maximize sealing performance and operating life.

OEM Manufacturing and Industrial Maintenance

NBR O-rings are widely used in OEM manufacturing and industrial maintenance because they provide dependable sealing in a broad range of applications.

They help:

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

Their versatility makes them a standard sealing solution across many industrial sectors.

Why Engineers Choose NBR O-Rings

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

Frequently Asked Questions (FAQ)

What does 150x3.5 mean?

It specifies an inside diameter of 150 mm and a cross-section diameter of 3.5 mm.

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 commonly specified hardness for general-purpose industrial O-rings.

Where is this O-ring commonly used?

It is widely used in hydraulic systems, pneumatic equipment, pumps, valves, industrial machinery, OEM manufacturing 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 sources and excessive heat to preserve their sealing properties.