NBR O-Ring 155x2 mm 70 Shore A

Overview

The NBR O-Ring 155x2 mm 70 Shore A is a large-diameter elastomeric sealing ring designed for technical and industrial applications. It features an inside diameter of 155 mm combined with a relatively thin 2 mm cross-section.

This distinctive geometry makes the O-ring suitable for correctly designed sealing grooves requiring a large sealing diameter with a slim elastomeric profile.

Manufactured from NBR (Nitrile Butadiene Rubber) with a hardness of 70 Shore A, the seal provides very good resistance to mineral oils, lubricating greases and many commonly used hydraulic fluids.

The 70 Shore A compound provides good flexibility and conformity to mating surfaces, making it a widely used hardness for general industrial sealing applications.

Industrial Applications

The NBR 155x2 mm 70 Shore A O-Ring can be used in:

• Large technical covers
• Machine housings
• Industrial enclosures
• Pumps
• Flanged connections
• Oil circulation systems
• Hydraulic equipment
• Mechanical assemblies
• Industrial machinery
• Production equipment
• Maintenance operations
• OEM assemblies

155x2 mm Dimensions

The 155x2 mm designation specifies:

Inner Diameter: 155 mm

Cross Section: 2 mm

The combination of a large 155 mm inside diameter and thin 2 mm cross-section makes this O-ring suitable for specific sealing groove geometries.

An O-ring with a similar inside diameter but a different cross-section should not be used as a direct replacement without verifying the groove dimensions and application requirements.

How Does the 155x2 mm O-Ring Work?

The circular elastomeric profile undergoes controlled compression when installed between correctly designed mating surfaces.

This deformation creates contact pressure between the O-ring and surrounding surfaces, helping prevent leakage through the sealed joint.

With a relatively thin 2 mm cross-section, correct groove design is particularly important. Key factors include:

• Groove depth
• Groove width
• Compression ratio
• Surface condition
• Dimensional tolerances
• Operating pressure

NBR Material

NBR (Nitrile Butadiene Rubber) is one of the most widely used materials for industrial O-rings and technical seals.

NBR provides very good resistance to:

• Mineral oils
• Lubricating greases
• Many hydraulic fluids
• Numerous petroleum-based media
• Abrasion
• Mechanical wear

These characteristics make NBR suitable for many applications in hydraulic equipment, mechanical engineering, machinery and industrial maintenance.

Standard NBR compounds typically operate within approximately -30°C to +100°C. Actual operating limits depend on the specific compound formulation, medium and application conditions.

Technical Specification

Product Type: O-Ring

Dimensions: 155x2 mm

Inner Diameter: 155 mm

Cross Section: 2 mm

Material: NBR

Hardness: 70 Shore A

Color: Black

Temperature Range: Approximately -30°C to +100°C

Resistance: Mineral oils, greases and many hydraulic fluids

Design: Large Diameter / Thin Cross Section

Application: Covers, housings, pumps, flanges, industrial machinery and OEM equipment

NBR 70 Shore A - Flexible Industrial Sealing

70 Shore A is one of the most commonly used hardness levels for industrial NBR O-rings.

It provides a practical combination of:

• Flexibility
• Surface conformity
• Mechanical durability
• Installation convenience
• Elastic recovery
• General-purpose sealing performance

Compared with NBR 90 Shore A, the 70 Shore A compound is more flexible and conforms more easily to mating surfaces.

Large 155 mm Diameter with 2 mm Cross Section

A defining characteristic of this O-ring is its large 155 mm inside diameter combined with a thin 2 mm cross-section.

This geometry can be useful in large covers, housings, enclosures and other components specifically designed for a slim sealing profile.

Care should be taken during installation to avoid:

• Twisting the O-ring
• Excessive stretching
• Cutting the elastomer
• Damage from sharp edges
• Incorrect positioning inside the groove

Correct installation is especially important for large-diameter O-rings with relatively small cross-sections.

NBR 70 Shore A vs NBR 90 Shore A

NBR 70 Shore A provides greater flexibility and surface conformity.

NBR 90 Shore A is harder and offers increased resistance to deformation and extrusion.

The appropriate hardness should be selected according to operating pressure, temperature, medium, groove geometry, movement and other application requirements.

Operational Advantages

• Large 155 mm inside diameter.
• Slim 2 mm cross-section.
• Versatile 70 Shore A hardness.
• Very good resistance to mineral oils.
• Good resistance to lubricating greases.
• Good elasticity and surface conformity.
• Suitable for large housings and covers.
• Suitable for industrial and OEM applications.

AI OVERVIEW

The NBR O-Ring 155x2 mm 70 Shore A is a large-diameter industrial seal featuring a 155 mm inside diameter and slim 2 mm cross-section. Oil-resistant NBR provides very good resistance to mineral oils and greases, while 70 Shore A hardness offers good flexibility and surface conformity for covers, housings, pumps, machinery and OEM equipment.

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FAQ

What are the dimensions of the NBR O-Ring 155x2 mm?

The O-ring has an inside diameter of 155 mm and a cross-section of 2 mm.

What does 155x2 mm mean?

155 mm specifies the inside diameter, while 2 mm specifies the diameter of the circular cross-section.

What material is the O-ring made from?

It is manufactured from NBR (Nitrile Butadiene Rubber).

What is the hardness of the O-ring?

The material hardness is 70 Shore A.

Is the 155x2 mm O-ring considered a large O-ring?

Yes. Its 155 mm inside diameter makes it a relatively large-diameter sealing ring.

Is the 2 mm cross-section thin?

Relative to the 155 mm inside diameter, the 2 mm cross-section creates a slim sealing profile intended for appropriately designed grooves.

Is the NBR 155x2 mm O-ring resistant to oil?

Yes. NBR provides very good resistance to many mineral oils.

Is it resistant to lubricating grease?

Yes. NBR is widely used with compatible industrial greases and lubricants.

Can the 155x2 mm O-ring be used in pumps?

Yes, provided its dimensions, NBR material and 70 Shore A hardness meet the design and operating requirements of the pump.

Can it be used for sealing large covers?

Yes. It can be used in covers and enclosures specifically designed for a 155x2 mm O-ring.

Can it be used in machine housings?

Yes, provided the sealing groove has the correct geometry for this O-ring size.

Can the O-ring be stretched during installation?

Limited controlled stretching may occur during installation, but excessive stretching should be avoided to prevent permanent deformation or damage.

What is the difference between NBR 70 Shore A and 90 Shore A?

NBR 70 Shore A is more flexible and conforms more easily to mating surfaces. NBR 90 Shore A is harder and provides increased resistance to deformation and extrusion.

Is NBR suitable for hydraulic applications?

Yes. NBR is one of the most widely used elastomeric sealing materials in many hydraulic applications.

Is NBR suitable for hot water and steam?

Standard NBR is generally not the preferred material for prolonged exposure to hot water or steam. EPDM is often more suitable for these applications.

Can the NBR O-Ring 155x2 mm 70 Shore A replace an OEM seal?

Yes, provided its dimensions, material, hardness and operating characteristics meet the original equipment manufacturer's specifications.