O-Ring 1.78x1.78 NBR 70 Shore A

What Is the O-Ring 1.78x1.78 NBR 70 Shore A 100 pcs?

The O-Ring 1.78x1.78 NBR 70 Shore A is a compact technical sealing ring manufactured from NBR (Nitrile Butadiene Rubber, Buna-N). The dimensions 1.78x1.78 mm indicate an inside diameter of 1.78 mm and a cross-section of 1.78 mm. The 100-piece pack is intended primarily for workshops, maintenance departments, precision equipment repairs, pneumatic components and small assembly runs where a practical supply of identical seals is required.

Technical Specification

Product Type: O-Ring

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

Hardness: 70 Shore A

Inside Diameter: 1.78 mm

Cross Section: 1.78 mm

Colour: Black

Operating Temperature: Approximately -30°C to +100°C

Chemical Resistance:

• Mineral oils
• Mineral-based hydraulic oils
• Lubricating greases
• Selected petroleum-based fuels
• Compatible industrial fluids

Packaging: 100 pcs

Applications in Service and Workshop Operations

Due to its compact dimensions, the O-Ring 1.78x1.78 NBR 70 Shore A is particularly useful for sealing small components and precision assemblies.

Typical applications include:

• Small technical valves
• Pneumatic fittings
• Connectors
• Control components
• Measuring equipment
• Small pumps
• Industrial automation
• Workshop equipment
• Precision mechanisms
• Machinery repair
• Maintenance operations

The groove dimensions and compatibility of NBR with the operating medium should always be verified before installation.

Why Choose NBR 70 Shore A?

NBR 70 Shore A is one of the most commonly used elastomer compounds in technical sealing because it combines good mechanical properties with excellent resistance to mineral oils.

Important material properties include:

• Excellent resistance to mineral oils
• Good resistance to lubricating greases
• Good abrasion resistance
• Good mechanical strength
• Suitable elasticity
• Reliable sealing performance
• Suitability for many static applications
• Wide use in machinery maintenance

The 70 Shore A hardness provides a practical balance between flexibility and resistance to deformation.

Pneumatic Applications

The compact dimensions of the 1.78x1.78 mm O-Ring make it suitable for small pneumatic components such as valves, fittings, distributors and control devices.

Correct groove design is especially important with small O-rings. Excessive compression, stretching or surface damage during installation can significantly reduce sealing performance.

Benefits of the 100-Piece Pack

The 100-piece package is designed for users who perform regular maintenance and repair work.

It provides several practical benefits:

• Convenient workshop inventory
• Reduced need for frequent ordering
• Immediate availability during repairs
• Suitable quantity for repetitive servicing
• Practical supply for small assembly runs
• Easier management of technical spare parts

This package size is specifically suited to workshop, repair, maintenance and technical purchasing applications.

Repair and Maintenance Applications

The O-Ring 1.78x1.78 NBR 70 Shore A can be kept as a service component by maintenance departments, particularly when the same seal size is used in multiple valves, fittings or small mechanical assemblies.

Keeping a 100-piece pack available helps technicians replace worn sealing rings quickly during scheduled maintenance or unexpected repairs.

Installation Recommendations

When installing small O-rings, particular attention should be paid to:

• Groove cleanliness
• Correct groove dimensions
• Sharp installation edges
• Excessive stretching
• Twisting of the O-ring
• Surface damage
• Compatibility of assembly lubricant with NBR

Even minor cuts or scratches can affect sealing performance, particularly with an O-ring of this size.

Frequently Asked Questions (FAQ)

What does the 1.78x1.78 mm size mean?
The first value indicates an inside diameter of 1.78 mm, while the second indicates a cross-section of 1.78 mm.

What is such a small NBR O-ring used for?
It can be used in small valves, pneumatic fittings, connectors, technical equipment and precision mechanical assemblies.

Is NBR 70 Shore A resistant to oil?
Yes. NBR provides very good resistance to many mineral oils and lubricating greases.

Is a 100-piece pack suitable for workshop use?
Yes. It provides a practical quantity for regular repairs, servicing and maintenance without requiring an industrial-size package.

Can this O-ring be used in pneumatic systems?
Yes, provided its dimensions, groove design, pressure and other operating conditions are suitable for the application.

Frequently Asked Questions from Service Technicians and Mechanics

Can a small O-ring be easily damaged during installation?
Yes. With a 1.78 mm inside diameter, particular care should be taken to avoid sharp edges and excessive stretching.

Can a 1.78 mm cross-section be replaced with a 2 mm cross-section?
Not without checking the groove dimensions. Even a small difference in cross-section can significantly alter compression and sealing performance.

Can NBR operate in contact with grease?
Yes. NBR is compatible with many mineral oil-based lubricating greases.

Is this O-ring suitable for static sealing?
Yes. NBR O-rings are widely used for static sealing when groove dimensions and compression are correctly selected.

How should a 100-piece pack of NBR O-rings be stored?
Store the seals in a cool, dry place protected from direct sunlight, ozone and heat sources.