O-ring NBR 7.6x2.62 70 Shore A

Characteristics of O-ring NBR 7.6x2.62 mm

The NBR 70 Shore A O-ring is a circular elastomeric sealing element with a round cross-section. When installed in a correctly designed groove, compression between mating surfaces creates contact pressure that helps prevent fluid or gas leakage.

Key product characteristics:

• Inside diameter: 7.6 mm.

• Cross-sectional diameter: 2.62 mm.

• Material: NBR (nitrile butadiene rubber).

• Nominal hardness: 70 Shore A.

• Shape: Continuous circular ring with a round cross-section.

• Sealing type: Elastomeric O-ring.

• Application: Static and selected dynamic sealing systems.

• Packaging: 100 pieces per pack.

• Sales unit: One pack containing 100 O-rings.

NBR is widely used in sealing systems involving mineral-based oils, industrial greases and other compatible media.

Technical Specifications

Calculated Outside Diameter

The nominal outside diameter of an O-ring in its free, uncompressed state can be calculated as:

For this O-ring:

The calculated nominal outside diameter is 12.84 mm.

This is a geometric calculation based on nominal dimensions, not a separately verified manufacturing tolerance.

What Does O-ring NBR 7.6x2.62 mm 70 Shore A Mean?

7.6 mm - Inside Diameter

The inside diameter identifies the nominal diameter of the opening in the O-ring before installation.

It is an important selection parameter because it influences how the O-ring fits around a shaft, piston, connector or other mating component.

Depending on the sealing arrangement, installation may involve controlled stretching or another specified deformation.

Excessive stretching can reduce the cross-sectional diameter and affect sealing performance.

2.62 mm - Cross-Sectional Diameter

The cross-sectional diameter defines the nominal thickness of the elastomeric ring.

For this product, the cross-section measures 2.62 mm.

This dimension is particularly important when designing or selecting an O-ring groove.

It influences:

• Initial sealing compression.

• Groove fill.

• Contact pressure.

• Available space for elastomer deformation.

• Resistance to extrusion into the clearance gap.

• Suitability for static or dynamic operation.

An O-ring with a different cross-sectional diameter should not automatically be considered interchangeable, even when its inside diameter is similar.

NBR - Nitrile Butadiene Rubber

NBR is a synthetic elastomer commonly used in industrial sealing technology.

Its relevant properties include:

• Compatibility with many mineral-based oils.

• Resistance to numerous industrial lubricating greases.

• Elasticity suitable for compression sealing.

• Wear resistance under appropriate operating conditions.

• Suitability for a wide range of conventional industrial sealing applications.

NBR is not universally compatible with every hydraulic fluid, fuel, solvent, synthetic lubricant or chemical substance.

Chemical compatibility must be evaluated for the specific medium, concentration and operating temperature.

70 Shore A - Elastomer Hardness

The designation 70 Shore A identifies the nominal hardness of the NBR material according to the Shore A hardness scale.

Hardness influences the elastomer's resistance to indentation and deformation.

In O-ring applications, it affects:

• Compression behaviour.

• Initial sealing force.

• Resistance to extrusion.

• Installation characteristics.

• Response to operating pressure.

• Suitability for particular groove and clearance configurations.

A hardness of 70 Shore A does not independently establish a maximum permissible operating pressure.

Pressure capability depends on the complete sealing arrangement, including groove dimensions, extrusion gap, temperature, material properties and operating conditions.

Construction and Operating Principle

The O-ring NBR 7.6x2.62 mm consists of a continuous elastomeric ring with a circular cross-section.

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

This compression creates initial contact pressure, allowing the ring to act as a sealing element.

Under suitable conditions, the pressure of the sealed medium can contribute to the sealing action.

The effectiveness of the seal depends on:

• Correct groove dimensions.

• Appropriate O-ring compression.

• Controlled installation stretch.

• Clearance between mating components.

• Surface finish.

• Material compatibility.

• Operating pressure.

• Operating temperature.

• Type of movement.

• Lubrication conditions.

Incorrect groove dimensions or excessive compression may reduce service life or lead to premature seal failure.

NBR 70 Shore A vs FKM 70 Shore A and EPDM 70 Shore A

O-rings with identical dimensions and nominal hardness may have significantly different chemical and thermal properties.

These are general material characteristics rather than guaranteed performance specifications for a particular compound.

NBR, FKM and EPDM O-rings are not automatically interchangeable, even when their dimensions and Shore A hardness are identical.

The selection must account for the actual medium and operating conditions.

Applications of O-ring NBR 7.6x2.62 mm

NBR O-rings with these dimensions can be used in appropriately designed mechanical sealing systems.

Typical application categories include:

• Static sealing connections.

• Covers and housings.

• Selected hydraulic components.

• Selected pneumatic assemblies.

• Technical fittings and connectors.

• Industrial machinery components.

• Maintenance and repair applications.

These are general applications of NBR O-rings, not a verified list of equipment specifically requiring the 7.6x2.62 mm size.

Static Sealing Applications

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

Examples include suitably designed housing joints, covers and connectors.

Correct compression and groove dimensions are essential.

Dynamic Sealing Applications

O-rings may also be used in selected dynamic applications involving relative movement between components.

However, dynamic sealing requires additional consideration of:

• Friction.

• Wear.

• Lubrication.

• Surface finish.

• Operating speed.

• Pressure.

• Groove geometry.

• Extrusion clearance.

The dimensions and material alone do not establish suitability for a particular dynamic application.

Selection and Interchangeability

Before purchasing O-ring NBR 7.6x2.62 mm 70 Shore A, verify:

1. Inside diameter: 7.6 mm.

2. Cross-sectional diameter: 2.62 mm.

3. Sealing material: NBR.

4. Nominal hardness: 70 Shore A.

5. Groove dimensions and geometry.

6. Compatibility with the sealed medium.

7. Operating temperature.

8. Operating pressure.

9. Static or dynamic application.

10. Required dimensional tolerances and material specifications.

Can a 7.6x2.62 mm O-ring Be Replaced with a Similar Size?

Not automatically.

Even small dimensional differences can affect:

• Installation stretch.

• Compression ratio.

• Groove fill.

• Contact pressure.

• Extrusion resistance.

• Sealing reliability.

For example, a 7.5x2.5 mm O-ring is not automatically equivalent to a 7.6x2.62 mm O-ring.

The replacement must meet the dimensional and material requirements of the original sealing arrangement.

Installation Recommendations

Before installation, clean the O-ring groove and mating surfaces thoroughly.

Inspect the O-ring for:

• Cuts.

• Cracks.

• Surface damage.

• Permanent deformation.

• Contamination.

During installation:

• Avoid sharp edges and burrs.

• Do not twist the O-ring.

• Avoid excessive stretching.

• Use an installation lubricant compatible with NBR and the sealed medium when appropriate.

• Ensure that the O-ring is correctly positioned in the groove.

• Prevent pinching during assembly.

Correct installation reduces the risk of premature damage and leakage.

Storage

Store unused NBR O-rings in a clean, dry environment away from direct sunlight, excessive heat, ozone and chemicals that may affect elastomer properties.

Avoid prolonged stretching or deformation during storage.

Packaging - 100 Pieces per Pack

O-ring NBR 7.6x2.62 mm 70 Shore A is supplied in packs containing 100 individual O-rings.

This packaging format is suitable for industrial procurement, maintenance departments, workshops and technical service operations.

The sales unit is one pack of 100 pieces.

Alternative Designations and Search References

The product may also be identified using the following descriptions:

• O-ring NBR 7.6x2.62 mm 70 Shore A

• O-ring 7.6x2.62 NBR 70

• NBR O-ring 7.6x2.62 mm

• O-ring 7.6 mm ID 2.62 mm CS

• Nitrile O-ring 7.6x2.62 mm

• Rubber sealing ring NBR 7.6x2.62

• O-ring NBR 70 Shore A 7.6x2.62

• O-ring 7.6x2.62 mm - 100 pcs

These are alternative descriptive designations, not additional manufacturer part numbers or confirmed OEM references.

FAQ - O-ring NBR 7.6x2.62 mm 70 Shore A

1. What are the dimensions of this O-ring?

The O-ring has an inside diameter of 7.6 mm and a cross-sectional diameter of 2.62 mm. Its calculated nominal outside diameter in the free state is 12.84 mm.

2. What does NBR 70 Shore A mean?

NBR identifies nitrile butadiene rubber, while 70 Shore A specifies the nominal elastomer hardness measured on the Shore A scale.

3. How many O-rings are included in one pack?

Each pack contains 100 individual O-rings.

4. Is NBR 70 Shore A resistant to oil?

NBR is compatible with many mineral-based oils and industrial greases. Compatibility with a specific lubricant must be verified individually.

5. Can a 7.6x2.62 mm O-ring be replaced with a 7.5x2.5 mm O-ring?

Not without technical verification. Differences in inside diameter and cross-section affect installation stretch, compression and groove fill.

6. Is this NBR O-ring suitable for hydraulic systems?

It may be suitable for appropriately designed hydraulic applications involving compatible fluids. Operating pressure, temperature, groove geometry and extrusion clearance must be checked.

7. Can NBR 70 Shore A be replaced with FKM 70 Shore A?

Not automatically. Although both materials may have the same nominal hardness, their chemical compatibility and operating characteristics differ.

8. Does 7.6x2.62 mm describe the outside diameter?

No. The first dimension is the inside diameter, and the second is the cross-sectional diameter. The calculated nominal outside diameter is 12.84 mm.

O-ring NBR 7.6x2.62 mm 70 Shore A - Key Technical Information

O-ring NBR 7.6x2.62 mm 70 Shore A is an elastomeric sealing ring with a 7.6 mm inside diameter and a 2.62 mm circular cross-section. Manufactured from nitrile butadiene rubber with a nominal hardness of 70 Shore A, it is designed for appropriately engineered sealing applications involving compatible media. Supplied in packs of 100 pieces.

O-ring NBR 7.6x2.62 mm 70 Shore A is available from simmering.pl, a specialist supplier of industrial sealing products, O-rings, rotary shaft seals and rolling bearings.

With warehouse operations in Lublin, Poland, simmering.pl supplies industrial customers, engineering businesses and international B2B buyers, with worldwide shipping options.