O-ring NBR 150x8 70 Shore A

O-ring NBR 150x8 mm 70 Shore A - Nitrile Rubber Sealing Ring GRN

GRN O-ring 150x8 mm NBR 70 Shore A is an elastomeric sealing ring with a nominal inside diameter of 150 mm and a circular cross-section diameter of 8 mm. Manufactured from nitrile butadiene rubber (NBR) with a nominal hardness of 70 Shore A, it has a calculated nominal outside diameter of 166 mm. The O-ring is primarily intended for static sealing applications, where controlled compression of the elastomer prevents fluid leakage between mating surfaces.

Technical Specifications - O-ring 150x8 NBR 70 Shore A

The nominal outside diameter is calculated from the inside diameter and cross-section:

150 mm + 2 x 8 mm = 166 mm.

This is a geometric calculation based on nominal dimensions, not a measured outside diameter of an individual O-ring.

Dimensional tolerances, maximum operating pressure, temperature limits, compression set and chemical resistance depend on the specific NBR compound and operating conditions.

What Does 150x8 NBR 70 Shore A Mean?

150 - Inside Diameter

The first number indicates the nominal inside diameter of the O-ring.

d1 = 150 mm

This is the nominal diameter of the opening in the uninstalled ring.

The actual manufactured dimension is subject to applicable production tolerances.

8 - Cross-Section Diameter

The second number indicates the diameter of the circular elastomer cross-section.

d2 = 8 mm

This dimension is essential when determining:

• Seal groove geometry.

• Required compression.

• Groove filling.

• Installation conditions.

• Sealing contact pressure.

NBR - Nitrile Butadiene Rubber

NBR is a synthetic elastomer widely used in industrial sealing applications involving many mineral-based oils and lubricating greases.

Actual resistance depends on the compound formulation, operating temperature and chemical composition of the fluid.

70 Shore A - Elastomer Hardness

70 Shore A identifies the nominal hardness of the rubber compound according to the Shore A hardness scale.

Hardness influences:

• Resistance to deformation.

• Compression force.

• Sealing contact behavior.

• Extrusion resistance.

• Suitability for specific groove geometries.

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

Construction and Operating Principle

The GRN 150x8 NBR 70 Shore A O-ring is a one-piece elastomeric sealing component with a circular cross-section.

It contains no metal reinforcement, garter spring or additional sealing lips.

Sealing is achieved through controlled deformation of the elastomer between mating components.

During installation, the O-ring is positioned inside a correctly designed groove. When the mating components are assembled, the cross-section is compressed, creating sealing contact.

When fluid pressure is present, it can further influence the contact forces and position of the O-ring within the groove.

Effective sealing depends on:

• Groove dimensions.

• Cross-section compression.

• O-ring stretch or compression.

• Extrusion gap.

• Elastomer hardness.

• Operating pressure.

• Temperature.

• Chemical compatibility.

• Surface finish of mating components.

NBR Material - Properties and Limitations

Nitrile butadiene rubber is commonly used in industrial sealing systems because many NBR compounds provide good resistance to mineral oils and lubricating greases.

Typical Applications of NBR

Depending on the specific formulation and operating conditions, NBR may be suitable for contact with:

• Mineral-based lubricating oils.

• Selected mineral-based hydraulic fluids.

• Industrial greases.

• Certain fuels and operating fluids.

Material Limitations

NBR is not universally resistant to all chemicals.

Compatibility requires particular attention when exposed to:

• Ketones.

• Certain organic solvents.

• Glycol-based brake fluids.

• Hot water.

• Steam.

• Strong oxidizing environments.

• Prolonged ozone exposure.

• Outdoor weathering conditions.

Chemical compatibility should not be assumed solely from the material designation NBR.

Operating Temperature of NBR O-rings

Many standard NBR compounds used in sealing applications have a typical indicative operating temperature range of approximately -30 to +100 degrees C.

However, this is a general characteristic of the NBR material family, not a verified temperature specification for the exact GRN 150x8 NBR 70 Shore A O-ring.

The actual permissible temperature range depends on:

• Rubber compound formulation.

• Sealed fluid.

• Exposure duration.

• Mechanical loading.

• Required service life.

Applications outside typical operating conditions require verification of the specific compound properties.

O-ring 150x8 NBR 70 Shore A for Static Sealing

An O-ring with dimensions of 150x8 mm may be used in appropriately designed static sealing arrangements.

Typical connection types include:

• Housing covers.

• Flanged joints.

• Machinery casings.

• Tank covers.

• Hydraulic system components.

• Industrial equipment connections.

These are examples of applications for this type of seal, not confirmed OEM applications for a particular machine.

Axial Sealing

In an axial sealing arrangement, the O-ring is compressed between mating surfaces in the axial direction.

Correct groove dimensions, pressure direction and compression are essential.

Radial Sealing

In a radial sealing arrangement, the O-ring operates between cylindrical surfaces.

The designer must verify component diameters, groove dimensions and permissible O-ring stretch or compression.

Can the 150x8 O-ring Be Used in Dynamic Applications?

Dynamic applications require separate technical evaluation.

Important considerations include:

• Type of movement.

• Relative surface velocity.

• Lubrication.

• Operating pressure.

• Temperature.

• Friction.

• Wear resistance.

• Groove geometry.

Not every NBR 70 Shore A O-ring is suitable for continuous shaft rotation or reciprocating piston movement.

Applications involving intensive movement may require a different sealing design.

NBR 70 Shore A vs Other O-ring Materials and Hardness Grades

Material selection depends on the operating fluid and application conditions.

NBR should not automatically be replaced with FKM or EPDM solely because the dimensions are identical.

Likewise, replacing a 70 Shore A O-ring with a 90 Shore A version requires verification of compression, installation force and extrusion gap.

How to Select an O-ring 150x8 mm

Before purchasing, verify:

1. Nominal inside diameter of 150 mm.

2. Nominal cross-section diameter of 8 mm.

3. NBR material.

4. Hardness of 70 Shore A.

5. Seal groove dimensions.

6. Required compression.

7. Permissible installation stretch.

8. Operating pressure.

9. Extrusion gap.

10. Operating temperature.

11. Fluid compatibility.

12. Static or dynamic operating conditions.

13. Dimensional tolerance and surface finish requirements.

O-rings with similar dimensions are not automatically interchangeable.

For example, a 150x8 mm O-ring is not automatically equivalent to a 150x7 mm or 150x8.4 mm O-ring.

Any dimensional substitution requires verification of groove geometry and operating conditions.

Installation and Storage

Before installation, clean the seal groove and all mating surfaces.

Avoid installing the O-ring over sharp edges without suitable protection.

During installation, prevent:

• Twisting of the ring.

• Cuts or surface damage.

• Excessive stretching.

• Use of chemically incompatible assembly lubricants.

• Installation into damaged grooves.

NBR O-rings should be stored in a clean, dry environment, protected from direct sunlight, ozone exposure and unnecessary deformation.

Alternative Designations and Reference Terms

The product may also be identified using the following designation formats:

• GRN O-ring 150x8 NBR 70 Shore A

• O-ring NBR 150x8 mm 70 Shore A

• O-ring 150x8 NBR 70

• Nitrile rubber O-ring 150x8

• Rubber sealing ring 150x8 NBR

• O-ring 150 mm ID 8 mm cross-section

• NBR 70 O-ring 150x8 mm

• GRN 150x8 NBR 70 Shore A

These are identification and search reference formats, not confirmed OEM numbers or approved cross-references to other manufacturers.

Frequently Asked Questions

What are the dimensions of the 150x8 NBR O-ring?

The nominal inside diameter is 150 mm and the cross-section diameter is 8 mm. The calculated nominal outside diameter is 166 mm.

What does NBR 70 Shore A mean?

NBR identifies nitrile butadiene rubber, while 70 Shore A indicates the nominal hardness of the elastomer.

Is the 150x8 NBR O-ring suitable for hydraulic oil?

It may be suitable for many mineral-based hydraulic oils. Compatibility must be confirmed for the specific fluid and operating temperature.

Is NBR 70 Shore A resistant to high temperatures?

Temperature resistance depends on the specific NBR compound and sealed medium. A guaranteed maximum operating temperature should not be assumed without material data.

Can NBR 70 Shore A be replaced with NBR 90 Shore A?

Not automatically. Changing hardness affects compression behavior, contact force and extrusion resistance.

Is the outside diameter 166 mm?

Yes. The calculated nominal outside diameter is 166 mm, based on an inside diameter of 150 mm and a cross-section of 8 mm. Actual manufactured dimensions are subject to tolerances.

Can a 150x8 O-ring operate under pressure?

Yes, when installed in a properly designed sealing arrangement. Permissible pressure depends on groove geometry, extrusion gap, elastomer hardness and operating conditions.

Can this O-ring be used to seal a housing cover?

It may be suitable for static housing cover applications when groove dimensions, material compatibility and operating conditions are appropriate.

O-ring 150x8 NBR 70 Shore A - Key Technical Information

GRN O-ring 150x8 NBR 70 Shore A is a nitrile rubber sealing ring with a nominal inside diameter of 150 mm, a cross-section of 8 mm and a calculated outside diameter of 166 mm. Its 70 Shore A hardness determines the elastomer's mechanical response. It is primarily intended for static sealing applications involving compatible oils, greases and industrial fluids.

NBR O-rings at simmering.pl

simmering.pl supplies NBR, FKM and EPDM O-rings, rotary shaft oil seals and other industrial sealing components for machinery manufacturers, maintenance departments and technical service providers.

For accurate product identification, specify the nominal inside diameter, cross-section, elastomer material and hardness.

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