O-ring 150.5x3.5 NBR 70 Shore A

Technical specifications

The nominal outside diameter is calculated as follows:

157.5 mm = 150.5 mm + 2 x 3.5 mm.

This is a calculated nominal geometric dimension, not an independently verified measurement of the product.

What does O-ring 150.5x3.5 NBR 70 Shore A mean?

The designation provides the essential information needed to identify the sealing ring.

• O-ring – an elastomeric sealing ring with a circular cross-section.

• 150.5 mm – nominal inside diameter.

• 3.5 mm – nominal cross-sectional diameter.

• NBR – nitrile butadiene rubber.

• 70 Shore A – nominal elastomer hardness measured on the Shore A scale.

A hardness of 70 Shore A is commonly used in industrial sealing applications. However, hardness alone does not determine the permissible operating pressure or the complete mechanical properties of the sealing ring.

Construction and sealing principle

The O-ring 150.5x3.5 NBR 70 Shore A features a continuous, one-piece elastomeric construction with a circular cross-section.

When installed in a correctly designed groove, the ring undergoes controlled compression. This deformation generates contact pressure between the mating surfaces, helping prevent leakage of the operating medium.

Sealing performance depends on several factors:

• Correct cross-sectional compression.

• Groove geometry and dimensions.

• Surface roughness of mating components.

• Elastomer compatibility with the operating medium.

• Operating temperature and pressure.

• Sealing gap dimensions.

• Installation and operating conditions.

In dynamic applications, additional considerations include friction, sliding speed, lubrication and wear resistance.

NBR 70 Shore A material properties

NBR is a synthetic elastomer produced from acrylonitrile and butadiene. Its properties depend on the acrylonitrile content, rubber formulation and additives.

Typical characteristics of appropriately selected NBR compounds include:

• Good resistance to many mineral oils.

• Compatibility with numerous industrial lubricants.

• Suitability for many mineral oil-based hydraulic fluids.

• Good mechanical properties under standard industrial operating conditions.

• Compound-dependent abrasion resistance.

NBR generally has limited resistance to ozone, prolonged ultraviolet exposure and certain solvents or aggressive chemicals.

It is not universally compatible with all hydraulic fluids, fuels or chemical substances.

The permissible operating temperature range must be established from the technical documentation for the specific NBR compound.

NBR 70 Shore A compared with other sealing materials

O-rings manufactured from different elastomers are not automatically interchangeable, even when their nominal dimensions are identical.

Typical applications

The O-ring 150.5x3.5 NBR 70 Shore A may be suitable for appropriately designed:

• Flanged connections.

• Equipment covers and housings.

• Hydraulic assemblies.

• Static sealing connections in industrial installations.

• Valve bodies.

• Mechanical assemblies requiring elastomeric sealing.

These are potential applications based on the dimensions and general properties of NBR, not verified OEM applications for specific equipment.

Selection and interchangeability

Before selecting the O-ring 150.5x3.5 NBR 70 Shore A, verify:

1. Inside diameter of 150.5 mm.

2. Cross-sectional diameter of 3.5 mm.

3. Nominal hardness of 70 Shore A.

4. Required dimensional tolerances.

5. Installation groove geometry.

6. Chemical compatibility with the operating medium.

7. Operating temperature and pressure.

8. Static or dynamic sealing conditions.

The dimensions 150.5x3.5 mm do not automatically establish interchangeability with similar sizes, such as 150x3.5 mm or 151x3.5 mm.

Even small dimensional differences can affect ring stretching, compression and sealing performance.

Alternative designations and search references

Common descriptive representations include:

• O-ring 150.5x3.5 NBR 70 Shore A

• O-ring 150.5x3.5 NBR 70 ShA

• O-ring NBR 150.5x3.5

• NBR sealing ring 150.5x3.5

• Nitrile rubber O-ring 150.5x3.5

• O-ring 150,5x3,5 NBR 70

• NBR O-ring 150.5x3.5 mm

These are alternative descriptive designations, not verified manufacturer part numbers or OEM cross-references.

Installation and operating recommendations

Before installation, clean the groove and mating surfaces thoroughly.

Inspect the installation area for sharp edges, burrs or surface damage that could cut or deform the elastomer.

Install the ring without twisting or excessive stretching.

Where assembly lubrication is required, use a lubricant compatible with the NBR compound and operating medium.

For larger-diameter O-rings, ensure that the ring is positioned evenly around the entire circumference of the groove.

Correct installation helps maintain uniform compression and reduces the risk of leakage or premature damage.

FAQ - Frequently asked questions

1. What are the dimensions of the O-ring 150.5x3.5 NBR 70 Shore A?

The inside diameter is 150.5 mm, the cross-sectional diameter is 3.5 mm, and the calculated nominal outside diameter is 157.5 mm.

2. What does 70 Shore A mean?

It indicates the nominal hardness of the elastomer measured on the Shore A scale. This value helps describe the material's resistance to indentation.

3. Is the NBR 150.5x3.5 O-ring resistant to hydraulic oil?

NBR is generally compatible with many mineral oil-based hydraulic fluids. Compatibility with a specific fluid must be verified.

4. Can an O-ring 150.5x3.5 be replaced with a 150x3.5 O-ring?

Not without checking groove geometry, dimensional tolerances and permissible ring stretching.

5. Is NBR 70 Shore A suitable for dynamic sealing applications?

It may be used in appropriately designed dynamic sealing arrangements, provided that geometry, lubrication and operating conditions are suitable.

6. What is the operating temperature range of an NBR 70 Shore A O-ring?

The temperature range depends on the specific NBR compound and has not been confirmed for this product.

7. Is an NBR O-ring resistant to fuels?

Many NBR compounds provide resistance to certain fuels, but compatibility depends on the fuel composition, elastomer formulation and operating temperature.

8. Is the outside diameter 157.5 mm?

Yes. This is the calculated nominal outside diameter based on the specified 150.5x3.5 mm dimensions.

O-ring 150.5x3.5 NBR 70 Shore A - key information

The O-ring 150.5x3.5 NBR 70 Shore A is an elastomeric sealing ring with a 150.5 mm inside diameter, 3.5 mm cross-section and nominal hardness of 70 Shore A. Manufactured from nitrile butadiene rubber, it is suitable for appropriately designed sealing applications involving compatible media, including many mineral oils and lubricants. Correct selection requires verification of groove dimensions, material compatibility and operating conditions.

The product is offered through the specialist B2B industrial trading platform simmering.pl, serving industrial companies, technical purchasing departments and maintenance operations, with worldwide shipping from stock in Poland.