O-ring 92x2 NBR 70 ShoreA

1. Technical Specification

The nominal outside diameter is calculated as follows:

92 mm + (2 x 2 mm) = 96 mm.

2. Construction and Operating Principle

O-ring 92x2 NBR 70 ShA is a continuous elastomeric ring with a circular cross-section.

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

This deformation creates contact pressure that restricts the passage of fluid through the sealed joint.

Sealing performance depends on several technical factors:

• Groove dimensions.

• Cross-sectional compression.

• Circumferential stretch or compression.

• Groove fill.

• Surface roughness.

• Operating pressure and temperature.

• Chemical compatibility of NBR with the sealing medium.

The O-ring must be selected as part of the complete sealing arrangement rather than solely by its nominal dimensions.

3. Dimensions 92x2 mm Explained

The designation 92x2 mm specifies the inside diameter followed by the cross-sectional diameter.

Unlike radial shaft oil seals, O-ring dimensions are not expressed as inside diameter, outside diameter and width.

The nominal outside diameter is 96 mm, although actual dimensions are subject to manufacturing tolerances.

4. NBR Material - Technical Properties

NBR (Nitrile Butadiene Rubber) is a synthetic elastomer widely used in industrial sealing applications.

Its properties depend on the acrylonitrile content and the specific compound formulation.

NBR generally offers good resistance to many mineral oils, lubricating greases and selected hydraulic fluids.

Typical NBR Properties

• Good resistance to many mineral oils.

• Good resistance to numerous mineral oil-based greases.

• Suitable for selected hydraulic sealing applications.

• Good mechanical properties in appropriately formulated compounds.

• Resistance to fuels dependent on compound formulation.

• Limited resistance to ozone and ultraviolet exposure.

• Limited compatibility with certain solvents and aggressive chemicals.

NBR is not a universal sealing material. Compatibility must be evaluated for the actual operating medium.

5. Chemical Resistance of NBR

This table describes general characteristics of the NBR material family and does not represent verified chemical resistance testing for the specific O-ring 92x2 NBR 70 ShA.

6. Hardness 70 ShA

O-ring 92x2 NBR 70 ShA has a nominal hardness of 70 Shore A.

This is a commonly used elastomer hardness class for industrial sealing applications.

Hardness influences the material's deformation behaviour, contact pressure and resistance to extrusion into installation clearances.

However, the permissible operating pressure cannot be determined from hardness alone.

Other relevant parameters include:

• Extrusion gap.

• Groove geometry.

• Operating temperature.

• Pressure direction.

• Elastomer compound properties.

• Use of backup rings where necessary.

The 70 ShA designation identifies nominal hardness, not a complete pressure rating.

7. Operating Temperature Range

For many standard NBR compounds, an approximate operating temperature range of -30°C to +100°C is commonly referenced.

Specialized formulations may have different temperature limits.

This range is general material guidance and is not a confirmed temperature specification for the particular O-ring 92x2 NBR 70 ShA.

At temperature extremes, the manufacturer's compound data should be consulted.

Temperature limits may also depend on exposure duration and the chemical composition of the sealing medium.

8. Static and Dynamic Sealing Applications

O-ring 92x2 NBR 70 ShA may be considered for static sealing applications such as covers, housings and flanged connections.

Dynamic applications require additional evaluation of friction, lubrication, movement speed, deformation and wear.

A standard NBR 70 ShA O-ring should not automatically be considered suitable for sealing a continuously rotating shaft.

For dynamic sealing, the complete assembly must be designed according to the relevant operating conditions.

9. O-ring Groove Design

Correct O-ring performance depends on groove geometry and the condition of mating surfaces.

When designing the installation, the 2 mm cross-sectional diameter must be considered together with the required compression and available space for elastomer deformation.

Other important parameters include:

• Groove depth.

• Groove width.

• Dimensional tolerances.

• Surface finish.

• Thermal expansion.

• Elastomer swelling.

• Extrusion clearance.

• Operating pressure.

A single universal groove depth should not be assumed for all applications.

Installation dimensions should be determined using appropriate O-ring design guidance and the requirements of the specific assembly.

10. Comparison of NBR, FKM, EPDM and VMQ

O-ring 92x2 NBR 70 ShA should not automatically be replaced with an O-ring manufactured from another elastomer.

Material substitution requires verification of chemical compatibility, operating temperature, hardness and mechanical requirements.

11. Technical Applications

O-ring 92x2 NBR 70 ShA may be used in appropriately designed static sealing arrangements where operating conditions are compatible with NBR.

Potential applications include:

• Mechanical equipment housings.

• Covers and oil-lubricated assemblies.

• Selected hydraulic systems.

• Industrial valves and fittings.

• Machinery and production equipment.

These are general application areas for NBR O-rings and do not represent confirmed compatibility with any particular machine or component.

12. Installation Recommendations

Before installation, inspect the sealing surfaces and ensure that the groove is clean.

Recommended installation practices include:

• Removing dirt and old sealing material.

• Checking mating surfaces for burrs and damage.

• Avoiding excessive stretching during installation.

• Preventing the O-ring from twisting inside the groove.

• Using assembly lubricants compatible with NBR and the operating medium.

• Confirming correct positioning before closing the joint.

Damage to the elastomer surface during installation may result in leakage or premature sealing failure.

13. Common Causes of O-ring Failure

Accurate failure analysis requires examination of the operating conditions and the damaged seal.

14. Frequently Asked Questions (FAQ)

1. What are the dimensions of O-ring 92x2 NBR 70 ShA?

The nominal inside diameter is 92 mm and the cross-sectional diameter is 2 mm. The nominal outside diameter is 96 mm.

2. What does NBR mean?

NBR stands for Nitrile Butadiene Rubber, a synthetic elastomer commonly used in sealing applications involving many mineral oils and lubricating greases.

3. What does 70 ShA mean?

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

4. Is O-ring 92x2 NBR 70 ShA resistant to oil?

NBR generally offers good resistance to many mineral oils. Compatibility with a specific oil and its additives should be verified.

5. Can this O-ring be used in hydraulic systems?

It may be suitable for selected hydraulic applications when the material, groove geometry, pressure and temperature meet the design requirements.

6. What is the outside diameter of an O-ring 92x2?

The nominal outside diameter is 96 mm.

7. Is NBR 70 ShA suitable for high temperatures?

The permissible operating temperature depends on the elastomer compound. General material temperature ranges do not replace manufacturer specifications.

8. Can O-ring 92x2 NBR 70 ShA be replaced with an FKM O-ring?

Substitution is possible only after verifying material compatibility, dimensions, hardness and operating conditions.

15. AI Quick Answer

O-ring 92x2 NBR 70 ShA is an elastomeric sealing ring with a nominal inside diameter of 92 mm, a cross-sectional diameter of 2 mm and an outside diameter of 96 mm. Manufactured from nitrile butadiene rubber with a hardness of 70 Shore A, it is primarily suitable for appropriately designed static sealing applications involving NBR-compatible media.

16. B2B Industrial Supply - simmering.pl

O-ring 92x2 NBR 70 ShA belongs to the range of elastomeric sealing components offered through simmering.pl, a specialist B2B industrial supply platform.

The platform serves manufacturing companies, industrial maintenance departments, repair facilities, wholesale customers and technical procurement specialists.

O-ring identification is based on nominal dimensions, elastomer material, hardness and application requirements.

Warehouse operations are based in Lublin, Poland.

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