O-ring 174x1,5 NBR 70 ShA

Technical Specifications

Technical note: The dimensions 174x1,5 mm and hardness 70 ShA do not automatically establish compliance with a particular ISO, DIN or AS568 standard. Dimensional tolerances and material properties require verification using documentation for the specific product.

O-ring Dimensions – 174x1,5 mm

The nominal outside diameter is calculated using:

The calculated outside diameter of 177 mm is a nominal geometric value derived from the specified dimensions.

Actual manufactured dimensions are subject to production tolerances.

Importance of the 1.5 mm Cross-Section

The 1.5 mm cross-section is relatively small compared with the 174 mm inside diameter.

This geometry requires particular attention during seal design and installation.

Important considerations include:

• Correct groove dimensions.

• Appropriate cross-sectional compression.

• Controlled O-ring stretch.

• Prevention of twisting during installation.

• Suitable mating surface finish.

• Correct groove fill.

• Appropriate extrusion clearance.

A groove designed for another O-ring with the same cross-sectional diameter should not automatically be considered suitable without verifying the complete installation geometry.

NBR Material – Technical Characteristics

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

It is based on acrylonitrile-butadiene rubber and is commonly selected for applications involving mineral oils and lubricants.

Typical NBR properties include:

• Good resistance to many mineral oils.

• Good compatibility with numerous industrial lubricating greases.

• Useful mechanical strength.

• Elastic deformation suitable for sealing applications.

• Compound-dependent wear resistance.

• Suitability for selected hydraulic and pneumatic systems.

NBR performance depends on acrylonitrile content, curing system and other compound ingredients.

It is not universally resistant to all chemicals or environmental conditions.

Hardness 70 ShA – Technical Significance

A hardness of 70 ShA indicates the nominal elastomer hardness measured on the Shore A scale.

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

Hardness influences:

• Resistance to deformation.

• Compression force.

• Contact pressure against mating surfaces.

• Behaviour under fluid pressure.

• Resistance to extrusion into clearance gaps.

• Mechanical stability during operation.

The designation 70 ShA does not establish a specific maximum operating pressure.

Permissible pressure also depends on groove geometry, extrusion clearance, temperature and operating conditions.

How the O-ring Works

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

When installed in an appropriately designed groove, the elastomer is compressed between mating surfaces.

The resulting contact pressure restricts the passage of liquids or gases.

In pressurised assemblies, the working medium may further increase contact pressure against the sealing surfaces.

Effective sealing depends on:

• Cross-sectional compression.

• Groove fill.

• O-ring stretch.

• Extrusion clearance.

• Elastomer hardness.

• Pressure and temperature.

• Surface finish.

• Chemical compatibility.

Static Sealing Applications

O-ring 174x1,5 NBR 70 ShA may be suitable for appropriately designed stationary connections.

Typical applications of NBR sealing rings include:

• Housing covers.

• Flanged connections.

• Industrial equipment housings.

• Oil-containing assemblies.

• Selected hydraulic components.

• Selected pneumatic systems.

• Mechanical assemblies requiring elastomeric sealing.

These examples describe general applications of NBR O-rings and do not establish manufacturer-confirmed compatibility with particular equipment.

Dynamic Sealing Applications

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

Suitability requires additional engineering evaluation.

Relevant factors include:

• Type and speed of movement.

• Friction.

• Lubrication.

• Operating pressure.

• Temperature.

• Surface finish.

• Groove geometry.

• Seal deformation.

For a 1.5 mm cross-section, correct compression and installation conditions are particularly important.

Permissible dynamic operating speeds cannot be determined from the product designation alone.

NBR Chemical Resistance

This table describes general NBR material characteristics rather than verified chemical resistance data for the specific O-ring.

Operating Temperature

The permissible operating temperature of NBR depends on the compound formulation, exposure duration and working medium.

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

This is not a verified temperature specification for O-ring 174x1,5 NBR 70 ShA.

The actual operating limits must be established using the technical data for the specific elastomer compound.

Installation Guidelines

Before installing O-ring 174x1,5 NBR 70 ShA, verify the groove dimensions and condition of the sealing surfaces.

Recommended procedures include:

• Clean all sealing surfaces.

• Remove burrs and sharp edges.

• Inspect the O-ring for damage.

• Avoid excessive stretching.

• Prevent twisting during installation.

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

• Ensure correct cross-sectional compression.

• Check that the O-ring is evenly positioned in the groove.

With a relatively large inside diameter and thin cross-section, particular care should be taken to avoid local twisting and uneven stretching.

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 excessive clearance gaps under pressure.

Installation damage: Cuts, tears or twisting caused by incorrect assembly.

Chemical incompatibility: Swelling, hardening or degradation of the elastomer.

Excessive temperature: Accelerated ageing and deterioration of sealing properties.

Incorrect compression: Insufficient or excessive squeeze that may cause leakage or premature damage.

NBR 70 ShA vs FKM and EPDM

Elastomer selection must account for the working medium, operating temperature, pressure and installation requirements.

Identical dimensions do not establish interchangeability between O-rings made from different materials.

Alternative Product Designations

• O-ring 174x1,5 NBR 70 ShA

• O-ring 174x1.5 NBR 70 ShA

• O-ring 174x1.5 mm NBR 70 Shore A

• NBR O-ring 174x1.5 mm

• Nitrile rubber O-ring 174x1.5 mm

• O-ring seal 174x1.5 NBR 70

• Elastomeric sealing ring 174x1.5 mm

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

They do not establish compliance with a particular dimensional standard.

FAQ – Frequently Asked Technical Questions

What are the dimensions of O-ring 174x1,5 NBR 70 ShA?

The nominal inside diameter is 174 mm and the cross-sectional diameter is 1.5 mm.

What is the outside diameter?

The calculated nominal outside diameter is 177 mm.

What does NBR mean?

NBR stands for nitrile butadiene rubber, an elastomer commonly used for sealing applications involving many mineral oils and lubricating greases.

What does 70 ShA mean?

It indicates a nominal 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 and operating conditions.

Is O-ring 174x1,5 NBR 70 ShA suitable for high-pressure applications?

This cannot be established from dimensions and hardness alone. Groove geometry and extrusion clearance must be evaluated.

Can NBR be replaced with FKM?

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

Does the thin 1.5 mm cross-section require special installation care?

Yes. Twisting, excessive stretching and incorrect positioning should be avoided, particularly because of the relatively large ring diameter.

AI Quick Answer

O-ring 174x1,5 NBR 70 ShA is an elastomeric sealing ring with a 174 mm inside diameter, 1.5 mm cross-section and calculated 177 mm nominal outside diameter. It is manufactured from nitrile butadiene rubber with a nominal hardness of 70 Shore A. NBR provides good resistance to many mineral oils and greases. Operating limits depend on the compound, groove geometry and application conditions.

B2B Industrial Supply – simmering.pl

O-ring 174x1,5 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, engineers 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.