O-Ring 52.2x3 NBR 70 Shore A

O-Ring 52.2x3 mm NBR 70 Shore A - Nitrile Rubber Sealing Ring (Pack of 100)

O-Ring 52.2x3 mm NBR 70 Shore A is an industrial elastomeric sealing ring manufactured from nitrile butadiene rubber (NBR). It has a nominal inside diameter of 52.2 mm, a cross-sectional diameter of 3 mm and a calculated nominal outside diameter of 58.2 mm. With a nominal hardness of 70 Shore A, this O-ring is primarily intended for static sealing applications involving compatible fluids, including selected mineral oils and lubricants. The product is supplied in packs of 100 pieces, making it suitable for industrial maintenance, equipment servicing and technical procurement.

Technical Specifications - O-Ring 52.2x3 NBR 70 Shore A

The nominal outside diameter is calculated as follows:

58.2 mm = 52.2 mm + 2 x 3 mm

This is the geometric outside diameter of the undeformed O-ring and does not include manufacturing tolerances.

Exact dimensional tolerances, operating temperature limits, chemical resistance, mechanical properties, compression set and permissible operating pressure must be verified against the technical documentation for the specific NBR compound.

What Does O-Ring 52.2x3 NBR 70 Shore A Mean?

The product designation identifies its essential technical characteristics.

• 52.2 - nominal inside diameter of 52.2 mm.

• 3 - nominal cross-sectional diameter of 3 mm.

• NBR - nitrile butadiene rubber, an elastomer widely used in industrial sealing.

• 70 Shore A - nominal hardness measured on the Shore A scale.

• 100 pcs - the sales package contains 100 individual O-rings.

The designation 52.2x3 mm specifies the inside diameter and cross-sectional diameter, not the inside and outside diameters.

What Is NBR Rubber?

NBR stands for Nitrile Butadiene Rubber, also known as acrylonitrile butadiene rubber or nitrile rubber.

It is a synthetic elastomer widely used in industrial sealing applications, particularly where resistance to mineral oils and selected lubricants is required.

The properties of NBR depend on several factors, including:

• Acrylonitrile content.

• Compound formulation.

• Vulcanization system.

• Fillers and additives.

• Manufacturing conditions.

Consequently, two NBR O-rings with identical dimensions and nominal hardness may differ in chemical compatibility, mechanical performance, compression set and permissible operating conditions.

Construction and Operating Principle

The 52.2x3 mm NBR O-ring is a one-piece elastomeric sealing element with a circular cross-section.

It contains no metal reinforcement, spring or additional sealing lip.

When installed in a correctly designed groove, the O-ring is compressed between two mating surfaces.

The resulting elastic deformation generates contact pressure that helps prevent liquids or gases from passing through the sealing interface.

Effective sealing depends on:

• Correct groove geometry.

• Appropriate cross-sectional compression.

• Groove fill.

• Surface finish of mating components.

• Operating pressure.

• Temperature.

• Chemical compatibility.

• Compression set.

• Extrusion gap dimensions.

• Static or dynamic operating conditions.

Importance of the 3 mm Cross-Section

The 3 mm cross-sectional diameter is a critical parameter affecting groove dimensions, compression and sealing contact pressure.

A 52.2x3 mm O-ring should not be replaced with an O-ring of a different cross-section without checking the groove design.

For example, 52.2x2.5 mm and 52.2x3.5 mm O-rings have different elastomer volumes and installation requirements.

Even a relatively small difference in cross-sectional diameter may result in incorrect compression and leakage.

NBR 70 Shore A - Material Properties

Resistance to Mineral Oils and Lubricants

NBR is commonly used in sealing applications involving mineral oils and selected industrial lubricants.

This makes nitrile rubber suitable for consideration in many mechanical assemblies, industrial machines and lubrication systems.

However, compatibility with every oil formulation, additive package or technical fluid cannot be assumed.

The specific NBR compound must be checked against the intended medium and operating conditions.

Hardness of 70 Shore A

A nominal hardness of 70 Shore A describes the elastomer's resistance to indentation.

Hardness influences:

• Deformation during installation.

• Sealing contact pressure.

• Force required for compression.

• Mechanical behavior under load.

• Resistance to extrusion into a clearance gap.

A hardness value of 70 Shore A does not independently determine maximum permissible operating pressure.

Pressure capability also depends on groove geometry, extrusion gap, temperature and the mechanical properties of the specific NBR compound.

Operating Temperature Range

NBR is used in many standard industrial sealing applications, but its resistance to low and elevated temperatures depends on the compound formulation.

The exact operating temperature range must be confirmed in the manufacturer's technical documentation.

Specific minimum and maximum operating temperatures should not be assigned without verified material data.

Chemical Resistance

NBR is not universally resistant to all chemicals.

Before installation, compatibility should be checked for:

• Mineral oils.

• Synthetic oils.

• Industrial lubricants.

• Fuels.

• Hydraulic fluids.

• Solvents.

• Cleaning agents.

• Process liquids and gases.

Standard NBR is generally unsuitable for many polar solvents, ketones and certain aggressive chemicals.

Chemical resistance also depends on temperature, concentration and exposure duration.

Aging and Environmental Resistance

For applications exposed to ozone, intensive ultraviolet radiation or outdoor weather conditions, the suitability of NBR should be carefully evaluated.

In certain applications, alternative elastomers such as EPDM or FKM may provide more appropriate environmental resistance.

The final material selection should be based on the requirements of the specific application.

NBR vs FKM, EPDM and VMQ O-Rings

These materials may all be available as O-rings with identical dimensions of 52.2x3 mm and nominal hardness of 70 Shore A.

However, they are not automatically interchangeable.

The correct elastomer must be selected according to the sealed medium, temperature, pressure, operating conditions and required service life.

Alternative Designations and Search References

The product may appear under the following commercial designations:

• O-Ring 52.2x3 NBR 70 Shore A

• NBR O-Ring 52.2x3 mm

• O-Ring 52.2x3 70 ShA

• Nitrile Rubber O-Ring 52.2x3 mm

• NBR Sealing Ring 52.2x3 mm

• Rubber O-Ring 52.2x3 mm

• O-Ring 52.2 mm ID x 3 mm CS

• Industrial NBR O-Ring 52.2x3

• NBR O-Ring 52.2x3 mm - 100 pcs

• O-Ring 52.2x3 NBR 70 Shore A - Pack of 100

• Nitrile Rubber Sealing Ring 52.2x3 - 100 Pieces

These are alternative commercial descriptions of the same nominal dimensions and material category.

They are not verified OEM part numbers or manufacturer-specific cross-references.

Selecting the Correct 52.2x3 mm NBR O-Ring

Before ordering and installation, verify the following parameters:

• Inside diameter: 52.2 mm.

• Cross-sectional diameter: 3 mm.

• Nominal outside diameter: 58.2 mm.

• Material: NBR.

• Nominal hardness: 70 Shore A.

• Groove dimensions and tolerances.

• Required cross-sectional compression.

• Installation stretch.

• Groove fill.

• Operating pressure.

• Operating temperature.

• Chemical compatibility.

• Static or dynamic sealing conditions.

• Surface finish.

• Extrusion gap.

• Required service life.

How Should the Groove Be Designed?

The groove must provide sufficient compression to create an effective seal while allowing space for elastomer deformation.

The groove depth should not simply be assumed to equal the 3 mm cross-sectional diameter.

Insufficient compression may cause leakage, while excessive compression may damage the elastomer or accelerate permanent deformation.

Groove dimensions should be selected according to the sealing arrangement and applicable engineering design guidelines.

Can a 52.2x3 mm O-Ring Be Replaced with a 52x3 mm O-Ring?

Not automatically.

The difference in nominal inside diameter is 0.2 mm.

This may affect installation stretch, groove fit and sealing contact pressure.

Interchangeability requires verification of dimensions, tolerances and operating conditions.

Can an NBR O-Ring Be Replaced with FKM?

Replacing NBR with FKM may be possible in selected applications, but the materials are not automatically interchangeable.

Chemical compatibility, operating temperature, mechanical properties, hardness and sealing geometry must all be evaluated.

Pack of 100 - Industrial Supply and Maintenance Applications

The product is supplied in a package containing 100 NBR O-rings measuring 52.2x3 mm with nominal hardness of 70 Shore A.

Bulk packaging is particularly useful for:

• Industrial maintenance departments.

• Mechanical workshops.

• Equipment repair services.

• Manufacturing facilities.

• Technical procurement departments.

• Companies assembling sealing kits.

• Businesses requiring repeated replacement of identical sealing components.

• Industrial spare parts distributors.

A pack of 100 provides a convenient sales quantity for maintenance inventories, production planning and technical purchasing.

It can help businesses organize spare parts and plan repeated assembly or servicing operations.

Typical Applications of NBR O-Rings 52.2x3 mm

NBR O-rings are widely used in industrial sealing technology, particularly where compatibility with mineral oils and selected lubricants is required.

Potential applications include:

• Static joints in industrial equipment.

• Mechanical covers and housings.

• Hydraulic assemblies, subject to fluid and pressure compatibility.

• Machinery connections.

• Lubrication systems.

• Mechanical components with correctly designed O-ring grooves.

• Static sealing arrangements involving compatible liquids or gases.

These are general applications of NBR O-ring technology, not verified OEM applications for this specific product.

Dynamic Sealing Applications

NBR O-rings may also be used in certain dynamic sealing arrangements.

However, these applications require appropriate engineering design that accounts for:

• Movement speed.

• Friction.

• Lubrication.

• Operating pressure.

• Temperature.

• Wear resistance.

• Expected service life.

Not every NBR 70 Shore A O-ring is suitable for every dynamic sealing application.

Installation and Maintenance

Preparing the Sealing Surfaces

Before installation, clean the groove and mating surfaces.

Remove dirt, burrs and sharp edges that could damage the elastomer.

Inspect the groove for scratches, corrosion and dimensional defects.

Installing the O-Ring

During installation:

• Position the O-ring evenly inside the groove.

• Avoid twisting the elastomer.

• Do not stretch the ring more than necessary.

• Avoid sharp installation tools.

• Use only assembly lubricants compatible with NBR and the sealed medium.

• Check that the O-ring is not trapped or pinched between mating components.

• Inspect the entire circumference for correct positioning.

Inspection During Service

During scheduled maintenance, inspect the O-ring for:

• Cracking and tearing.

• Permanent cross-sectional flattening.

• Excessive swelling.

• Loss of elasticity.

• Abrasion.

• Mechanical damage.

Replace the O-ring if deterioration or damage is detected.

Storage

Store NBR O-rings in a clean, dry environment without permanent compression or excessive stretching.

Protect them from direct sunlight, ozone sources, contamination and mechanical damage.

Frequently Asked Questions - O-Ring 52.2x3 NBR 70 Shore A

1. What are the dimensions of the 52.2x3 mm NBR O-ring?

The O-ring has a nominal inside diameter of 52.2 mm, cross-sectional diameter of 3 mm and outside diameter of 58.2 mm.

2. How many O-rings are included in one package?

Each sales package contains 100 NBR O-rings with nominal dimensions of 52.2x3 mm.

3. What does NBR mean?

NBR stands for nitrile butadiene rubber, a synthetic elastomer widely used in industrial sealing applications.

4. What does 70 Shore A mean?

70 Shore A indicates the nominal hardness of the nitrile elastomer. It influences deformation, contact pressure and sealing behavior.

5. Is the 52.2x3 mm NBR O-ring resistant to oil?

NBR is commonly used with mineral oils and selected lubricants. Compatibility with the specific oil formulation and operating conditions must still be verified.

6. Can a 52.2x3 mm O-ring be replaced with a 52x3 mm O-ring?

Not automatically. The difference in inside diameter may affect installation stretch and groove fit.

7. Is an NBR 70 Shore A O-ring suitable for hydraulic systems?

It may be suitable for appropriately designed hydraulic systems when the NBR compound is compatible with the hydraulic fluid, operating temperature and pressure.

8. Is this NBR O-ring suitable for food contact?

Not without appropriate documentation. Food-contact suitability requires verification of the specific NBR compound and finished product.

9. Can NBR O-rings be used outdoors?

Standard NBR may have limited resistance to ozone and weathering. Long-term outdoor suitability depends on the specific compound and exposure conditions.

10. What is the outside diameter of a 52.2x3 mm O-ring?

The nominal outside diameter is 58.2 mm, calculated by adding twice the 3 mm cross-sectional diameter to the 52.2 mm inside diameter.

O-Ring 52.2x3 NBR 70 Shore A - Key Product Information

The 52.2x3 mm NBR 70 Shore A O-ring is a nitrile rubber sealing ring with a 52.2 mm inside diameter, 3 mm circular cross-section and 58.2 mm nominal outside diameter. Its hardness is 70 Shore A. Designed primarily for compatible static sealing applications, it is supplied in packs of 100 pieces for industrial maintenance and technical procurement.

The 52.2x3 mm NBR 70 Shore A O-ring, pack of 100, is offered by simmering.pl, an industrial sealing components and bearing supplier operated by TG Ersatzteile Polska Sp. z o.o. The company maintains a warehouse in Lublin, Poland, serving industrial customers, maintenance departments and technical procurement teams with shipping across Poland and other European Union countries.