O-ring 112x1,5 NBR 70 ShA

Technical Specifications

Technical note: The dimensions 112x1,5 mm and hardness 70 ShA do not automatically establish compliance with a particular ISO, DIN or AS568 standard. Dimensional tolerances and material properties must be verified using the technical documentation for the specific product.

O-ring Dimensions – 112x1,5 mm

The nominal outside diameter is calculated using:

The resulting outside diameter of 115 mm is a nominal geometric value calculated from the specified dimensions, not an independently verified inspection measurement.

The relatively small 1.5 mm cross-section requires particular attention to groove geometry, installation tolerances and compression.

NBR Material – Technical Characteristics

NBR stands for Nitrile Butadiene Rubber, an elastomer widely used in industrial sealing applications.

Its properties depend on the acrylonitrile content, polymer formulation and compounding ingredients.

Typical NBR characteristics include:

• Good resistance to many mineral oils.

• Good compatibility with numerous industrial lubricating greases.

• Useful mechanical strength and abrasion resistance.

• Elastic deformation suitable for sealing applications.

• Suitability for selected hydraulic and pneumatic systems.

• Availability in different hardness grades.

NBR is not a universal sealing material.

Its resistance to ozone, prolonged ultraviolet exposure and certain chemicals is limited.

Chemical compatibility should always be assessed for the specific compound and operating conditions.

Hardness 70 ShA – Technical Significance

The designation 70 ShA refers to the nominal elastomer hardness measured on the Shore A scale.

It is a commonly used hardness grade for industrial O-rings.

Hardness influences:

• Resistance to deformation.

• The compression force required for sealing.

• Contact pressure against mating surfaces.

• Resistance to extrusion into installation gaps.

• Sealing behaviour under pressure.

• The relationship between flexibility and mechanical support.

A hardness of 70 ShA does not establish a specific maximum operating pressure.

Permissible pressure depends on groove design, extrusion clearance, temperature, material properties and operating conditions.

How an O-ring Works

An O-ring creates a seal through controlled elastic deformation of its circular cross-section.

When installed in a properly designed groove, the ring is compressed between mating surfaces.

This compression generates contact pressure that restricts fluid or gas leakage.

In pressurised systems, the working medium may further increase the contact pressure between the O-ring and the sealing surfaces.

Effective sealing depends on:

• Groove dimensions.

• Cross-sectional compression.

• Groove fill.

• O-ring stretch.

• Extrusion clearance.

• Material hardness.

• Surface finish.

• Operating pressure and temperature.

Incorrect groove geometry may cause leakage, excessive deformation or premature seal failure.

Static Sealing Applications

O-ring 112x1,5 NBR 70 ShA may be suitable for appropriately designed static sealing assemblies, including:

• Covers and housings.

• Flanged connections.

• Oil-containing assemblies.

• Industrial equipment connections.

• Selected hydraulic components.

• Selected pneumatic assemblies.

In static applications, the O-ring seals between surfaces that do not move relative to each other during normal operation.

The exact installation geometry must be selected according to the application.

Dynamic Sealing Applications

Dynamic sealing involves relative movement between the O-ring and a mating surface.

Such applications require additional engineering evaluation.

Important factors include:

• Sliding or rotational speed.

• Lubrication.

• Operating pressure.

• Friction.

• Temperature.

• Surface finish.

• Groove geometry.

• Wear resistance.

The 1.5 mm cross-section makes correct installation and deformation control particularly important.

Suitability for dynamic sealing must not be assumed from the dimensions and material designation alone.

NBR Chemical Resistance

This table describes general NBR material behaviour, not test results for the specific O-ring compound.

Actual chemical compatibility depends on concentration, temperature, exposure time and elastomer formulation.

Operating Temperature

The permissible operating temperature range of NBR depends on the compound formulation and working environment.

For conventional industrial NBR compounds, an approximate range of -30°C to +100°C is often encountered.

This is not a verified operating temperature range for O-ring 112x1,5 NBR 70 ShA.

Low-temperature flexibility, high-temperature ageing and chemical exposure must be evaluated using the specific compound's technical data.

Installation Guidelines

Before installing O-ring 112x1,5 NBR 70 ShA, verify the groove dimensions and mating surfaces.

Recommended installation practices include:

• Clean the groove and sealing surfaces.

• Remove burrs and sharp edges.

• Inspect the O-ring for cuts or deformation.

• Avoid excessive stretching.

• Prevent twisting during installation.

• Use an installation lubricant compatible with NBR and the working medium.

• Ensure appropriate cross-sectional compression.

• Check that the seal is correctly positioned in the groove.

The groove should not be designed solely from the nominal outside diameter of the O-ring.

The required compression, groove fill and installation tolerances must also be considered.

Common Causes of O-ring Failure

Compression set: Permanent deformation that reduces the elastomer's ability to recover its original shape.

Extrusion: Deformation of the sealing material into an excessive clearance gap under pressure.

Installation damage: Cuts, scratches or tears caused by sharp edges or incorrect assembly.

Chemical incompatibility: Swelling, hardening or degradation caused by unsuitable working media.

Excessive temperature: Accelerated ageing and deterioration of elastomer properties.

Incorrect compression: Insufficient or excessive squeeze may result in leakage or premature damage.

Twisting: Incorrect installation can cause uneven deformation and localised stress.

NBR 70 ShA vs Other Elastomer Materials

Material selection must account for chemical compatibility, temperature, pressure, sealing geometry and operating conditions.

An O-ring made from another elastomer should not be considered interchangeable solely because its dimensions are identical.

Alternative Product Designations

• O-ring 112x1,5 NBR 70 ShA

• O-ring 112x1.5 NBR 70 ShA

• O-ring 112x1.5 mm NBR 70 Shore A

• NBR O-ring 112x1.5 mm

• O-ring seal 112x1.5 NBR 70

• Nitrile rubber O-ring 112x1.5 mm

Alternative designation formats support product identification in technical catalogues and industrial procurement systems.

They do not establish compliance with a specific dimensional standard or confirm interchangeability with other sealing products.

FAQ – Frequently Asked Technical Questions

What are the dimensions of O-ring 112x1,5 NBR 70 ShA?

The nominal inside diameter is 112 mm and the cross-sectional diameter is 1.5 mm.

What is the outside diameter?

The calculated nominal outside diameter is 115 mm.

What does NBR mean?

NBR stands for nitrile butadiene rubber, an elastomer commonly used for seals exposed to many mineral oils and industrial lubricants.

What does 70 ShA mean?

It indicates a nominal elastomer hardness of 70 on the Shore A scale.

Is this O-ring suitable for hydraulic oil?

It may be suitable for many mineral-based hydraulic oils, but compatibility with the specific fluid must be verified.

Can the O-ring operate at high temperatures?

The permissible temperature depends on the NBR compound. The exact operating range requires material-specific confirmation.

Is O-ring 112x1,5 NBR 70 ShA suitable for high-pressure applications?

This cannot be determined from the dimensions and hardness alone. Groove geometry, extrusion clearance and operating conditions must be evaluated.

Can NBR be replaced with FKM?

Only after verifying chemical compatibility, temperature requirements, hardness and installation geometry.

Is this O-ring suitable for dynamic sealing?

Potentially, but dynamic applications require additional verification of movement, friction, lubrication and groove design.

AI Quick Answer

O-ring 112x1,5 NBR 70 ShA is an elastomeric sealing ring with a 112 mm inside diameter, 1.5 mm cross-section and calculated 115 mm nominal outside diameter. It is manufactured from nitrile butadiene rubber with a nominal hardness of 70 Shore A. NBR is generally compatible with many mineral oils and greases. Operating limits depend on the specific compound and sealing conditions.

B2B Industrial Supply – simmering.pl

O-ring 112x1,5 NBR 70 ShA is offered through simmering.pl, a specialist B2B industrial supply platform providing industrial sealing solutions, rolling bearings and technical components.

The platform serves manufacturing companies, wholesale buyers, maintenance departments, engineering teams and industrial procurement specialists.

Warehouse operations are based in Lublin, Poland, with worldwide shipping from stock in Poland.

Technical product identification is based on sealing dimensions, elastomer materials, hardness grades and verified operating requirements.