O-ring NBR 8x1.5 70 Shore A

O-ring NBR 8x1.5 mm 70 Shore A - Oil-Resistant Sealing Ring, 100 pcs

O-ring NBR 8x1.5 mm 70 Shore A is an elastomeric sealing ring with a nominal inside diameter of 8 mm and a cross-section diameter of 1.5 mm. It is manufactured from nitrile butadiene rubber (NBR) with a nominal hardness of 70 Shore A. The calculated outside diameter is 11 mm. NBR provides resistance to many mineral oils and industrial lubricating greases. The product is supplied in B2B packs containing 100 O-rings.

Technical Specifications - O-ring NBR 8x1.5 mm 70 Shore A

All dimensions are nominal. Manufacturing tolerances and compliance with a specific dimensional standard must be confirmed for the supplied product.

What Does O-ring 8x1.5 NBR 70 Shore A Mean?

The designation identifies the O-ring's dimensions, material and hardness.

8 mm - Inside Diameter

The nominal inside diameter of the sealing ring in its free, uninstalled condition.

1.5 mm - Cross-Section Diameter

The nominal diameter of the circular elastomer cross-section. This dimension is essential when selecting the correct sealing groove and compression level.

NBR - Nitrile Butadiene Rubber

An elastomer commonly used in sealing applications involving compatible oils, greases and industrial fluids.

70 Shore A - Nominal Hardness

The nominal hardness of the elastomer measured on the Shore A scale. It does not indicate the maximum operating pressure or temperature range.

O-ring 8x1.5 mm - Dimensions and Outside Diameter

The designation 8x1.5 mm specifies the inside diameter and cross-section diameter, not the inside and outside diameters.

For this product:

• Inside diameter: 8 mm.

• Cross-section diameter: 1.5 mm.

• Calculated outside diameter: 11 mm.

The outside diameter is calculated as:

8 + 2(1.5) = 11 mm

The 11 mm outside diameter is a geometric value derived from the nominal dimensions. It does not replace actual dimensional measurements or manufacturing tolerance specifications.

NBR 70 Shore A - Resistance to Oils and Greases

NBR is widely used in industrial sealing technology because appropriately formulated nitrile rubber compounds offer good resistance to many petroleum-based substances.

Depending on the specific compound, NBR may be suitable for contact with:

• Mineral oils.

• Mineral-based machine oils.

• Mineral lubricating greases.

• Selected mineral oil-based hydraulic fluids.

Oil-resistant does not mean resistant to every type of oil or industrial fluid.

Compatibility must be verified for the specific operating medium, its additives, temperature and exposure duration.

NBR is not universally suitable for aggressive chemicals, solvents or all types of brake fluids.

The NBR 70 Shore A designation alone does not establish an exact operating temperature range or maximum permissible pressure.

What Does 70 Shore A Hardness Mean?

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

Hardness affects how the O-ring deforms under compression and how it interacts with the mating sealing surfaces.

When selecting an O-ring, consider:

• Operating pressure.

• Clearance between mating components.

• Groove geometry.

• Required compression.

• Operating temperature.

• Fluid compatibility.

• Static or dynamic sealing conditions.

An NBR O-ring with 70 Shore A hardness is not automatically interchangeable with an NBR 90 Shore A O-ring of the same dimensions.

Construction and Sealing Principle

The 8x1.5 mm O-ring is a one-piece, continuous elastomeric ring with a circular cross-section.

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

This controlled deformation creates sealing contact. Its effectiveness depends on the design and operating conditions of the complete assembly.

For a 1.5 mm cross-section, important considerations include:

• Correct groove depth.

• Appropriate groove width.

• Controlled elastomer compression.

• Suitable surface condition.

• Prevention of O-ring twisting.

• Protection against installation damage.

Applications of O-ring NBR 8x1.5 mm 70 Shore A

The 8x1.5 mm O-ring can be considered for appropriately designed static sealing applications and selected dynamic sealing arrangements where the operating conditions permit.

Typical application categories for NBR O-rings of this size include:

• Small hydraulic connections.

• Industrial fittings and connectors.

• Valve assemblies.

• Mechanical housing joints.

• Components operating with compatible lubricating oils.

• Machine assemblies requiring compact elastomeric seals.

These are potential application categories based on the product's material and construction, not confirmed fitments for specific equipment models.

Before replacing an existing seal, verify the equipment documentation, original O-ring dimensions and groove geometry.

O-ring NBR 8x1.5 mm 70 Shore A vs Other Variants

These variants illustrate differences in materials and hardness. They are not a list of verified interchangeable replacement products.

Identical dimensions do not guarantee complete interchangeability.

B2B Packaging - 100 O-rings per Pack

This product is supplied in packs containing 100 O-rings with nominal dimensions of 8x1.5 mm and material specification NBR 70 Shore A.

Bulk packaging supports industrial purchasing, maintenance operations, technical workshops and spare parts inventory management.

When ordering, note that the sales unit is one pack of 100 pieces.

Alternative Designations and References

This product may also be described as:

• O-ring 8x1.5 NBR 70 Shore A

• NBR O-ring 8x1.5 mm

• O-ring NBR 8x1.5 70 ShA

• Nitrile O-ring 8x1.5 mm

• Oil-resistant sealing ring 8x1.5 mm

• O-ring 8x1.5 NBR 70 - 100 pcs

• Metric O-ring 8 mm ID x 1.5 mm CS

These are alternative descriptions of the dimensions and material specification, not verified OEM references.

How to Select the Correct O-ring

Before ordering, verify:

1. Nominal inside diameter of 8 mm.

2. Cross-section diameter of 1.5 mm.

3. NBR material.

4. Nominal hardness of 70 Shore A.

5. Compatibility with the operating oil, grease or other medium.

6. Groove dimensions and geometry.

7. Required sealing compression.

8. Operating pressure and temperature.

9. Static or dynamic sealing application.

10. Required quantity of 100 pieces per pack.

Do not select an O-ring based solely on its calculated outside diameter of 11 mm.

Correct installation also depends on the inside diameter, cross-section and sealing groove design.

Installation and Storage

Before installation, clean the sealing groove and inspect the mating surfaces.

During installation:

• Avoid sharp edges and tools that could damage the elastomer.

• Do not stretch the O-ring excessively.

• Prevent twisting inside the groove.

• Use only installation lubricants compatible with NBR and the operating medium.

• Confirm correct positioning before assembling the components.

Store O-rings in a clean, dry environment protected from direct sunlight, ozone sources and excessive heat.

Frequently Asked Questions

What are the dimensions of the O-ring 8x1.5 NBR 70 Shore A?

The nominal inside diameter is 8 mm, and the cross-section diameter is 1.5 mm. The calculated outside diameter is 11 mm.

Is the NBR 8x1.5 mm O-ring oil-resistant?

NBR generally offers good resistance to many mineral oils and industrial lubricating greases. Compatibility must be verified for the specific fluid and operating conditions.

How many O-rings are included in one pack?

One B2B pack contains 100 O-rings.

What does 70 Shore A mean?

It indicates the nominal hardness of the elastomer measured on the Shore A scale. Hardness influences the ring's deformation under compression.

Can this O-ring be used in hydraulic systems?

It may be suitable for appropriately designed hydraulic systems using compatible fluids. Groove geometry, pressure, temperature and equipment requirements must be checked.

Can an FPM O-ring replace an NBR O-ring of the same dimensions?

Not automatically. FPM and NBR have different chemical and operating characteristics. Material substitution requires verification of the application requirements.

Is an NBR 90 Shore A O-ring interchangeable with a 70 Shore A version?

Not necessarily. Higher hardness changes elastomer deformation and may affect sealing performance.

Is the outside diameter of this O-ring 11 mm?

Yes. Its calculated nominal outside diameter is 11 mm, based on an 8 mm inside diameter and 1.5 mm cross-section.

O-ring NBR 8x1.5 mm 70 Shore A - Quick Technical Answer

The O-ring NBR 8x1.5 mm 70 Shore A is an oil-resistant nitrile rubber sealing ring with an 8 mm nominal inside diameter, 1.5 mm cross-section and 11 mm calculated outside diameter. Its nominal hardness is 70 Shore A. It is supplied in B2B packs of 100 pieces for appropriately designed industrial sealing applications.

NBR O-rings at simmering.pl

simmering.pl supplies NBR O-rings in B2B packaging for industrial companies, technical service providers, workshops and maintenance departments.

Our range includes sealing rings in various diameters, cross-sections and hardness grades for industrial applications.

Our warehouse is located in Lublin, Poland. We ship orders throughout Poland, the European Union and to international customers.