O-Ring 5.5x2.5 NBR 70 ShA

Product Overview

The 5.5x2.5 mm NBR 70 O-Ring is a premium-quality sealing ring manufactured from Nitrile Butadiene Rubber (NBR) with a hardness of 70 Shore A. It is designed to provide reliable sealing in both static and dynamic applications where resistance to oils, greases and hydraulic fluids is required.

Supplied in economical packs of 100 pieces, this O-ring is an excellent choice for industrial maintenance, manufacturing plants, repair workshops, OEM production and wholesale distribution.

With an inside diameter of 5.5 mm and a 2.5 mm cross-section, it provides dependable sealing performance in hydraulic systems, pneumatic equipment, valves, pumps, compressors and a wide range of industrial and automotive applications.

Technical Specifications

Key Features

The 5.5x2.5 NBR 70 O-Ring offers:

• High-quality NBR material
• 70 Shore A hardness
• Excellent resistance to mineral oils
• Good resistance to greases and hydraulic fluids
• Reliable sealing performance
• High abrasion resistance
• Long service life
• Flexible and durable construction
• Easy installation
• Pack of 100 pieces
• Suitable for industrial and professional use

Typical Applications

The 5.5x2.5 mm NBR O-Ring is commonly used in:

• Hydraulic systems
• Pneumatic equipment
• Hydraulic cylinders
• Pneumatic cylinders
• Pumps
• Valves
• Compressors
• Automotive components
• Agricultural machinery
• Industrial machinery
• Maintenance and repair operations
• OEM manufacturing

Material Properties – NBR 70 Shore A

NBR (Nitrile Butadiene Rubber) provides:

• Excellent resistance to mineral oils
• High resistance to greases
• Good resistance to hydraulic fluids
• High mechanical strength
• Excellent abrasion resistance
• Reliable sealing performance
• Cost-effective durability

Why Choose NBR O-Rings?

NBR is one of the most widely used sealing materials because it offers:

• Excellent oil resistance
• Long service life
• High elasticity
• Reliable sealing
• Easy installation
• Outstanding value for money

Frequently Asked Questions (FAQ)

What are the O-ring dimensions?

The O-ring has an inside diameter of 5.5 mm and a 2.5 mm cross-section.

What does NBR 70 mean?

It means the O-ring is manufactured from Nitrile Butadiene Rubber (NBR) with a hardness of 70 Shore A.

How many O-rings are included?

Each package contains 100 pieces.

What media is NBR resistant to?

NBR is highly resistant to mineral oils, greases, hydraulic fluids and compressed air.

Where is this O-ring commonly used?

It is widely used in hydraulic systems, pneumatic equipment, pumps, valves, automotive components and industrial machinery.

Frequently Asked Questions from Engineers

Why use NBR O-rings?

NBR offers an excellent combination of oil resistance, durability, flexibility and affordability, making it the preferred sealing material for numerous industrial applications.

What causes O-ring failure?

• Incorrect sizing
• Improper installation
• Twisting during assembly
• Excessive pressure
• Chemical incompatibility
• High operating temperatures
• Mechanical damage

How can O-ring life be extended?

Use the correct groove dimensions, lubricate the O-ring before installation, avoid twisting during assembly and select the proper material for the operating conditions.