NBR O-Ring 31.34x3.53 mm 70 Shore A - 100 pcs

NBR O-Ring 31.34x3.53 mm - Pack of 100

The NBR O-Ring 31.34x3.53 mm 70 Shore A is a technical elastomeric seal designed for industrial, hydraulic, mechanical and maintenance applications.

The product is supplied in a practical pack of 100 O-rings, making it particularly suitable for workshops, maintenance departments, manufacturing companies, machine builders and B2B customers requiring a regular supply of identical seals.

Each O-ring features an inside diameter of 31.34 mm and a 3.53 mm cross-section.

Manufactured from NBR (Nitrile Butadiene Rubber) with a hardness of 70 Shore A, the seal combines good flexibility and elastic recovery with very good resistance to many mineral oils and lubricating greases.

Industrial Applications

The NBR 31.34x3.53 mm O-Ring can be used in correctly designed:

• Hydraulic systems
• Pumps
• Valves
• Hydraulic cylinders
• Technical fittings
• Machine housings
• Oil systems
• Gearboxes
• Industrial machinery
• Production equipment
• Maintenance operations
• OEM assemblies

The 100-piece package is particularly useful for repeated assembly, repair and replacement work.

31.34x3.53 mm Dimensions

The 31.34x3.53 mm designation specifies:

Inner Diameter: 31.34 mm

Cross Section: 3.53 mm

The O-ring has a circular elastomeric profile with a cross-sectional diameter of 3.53 mm.

When installed in a correctly designed groove, the elastomer undergoes controlled compression. This creates contact pressure between the O-ring and mating surfaces, helping to provide an effective seal.

The groove dimensions should always be verified before installation.

NBR - Nitrile Rubber

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

NBR provides very good resistance to many:

• Mineral oils
• Lubricating greases
• Hydraulic oils
• Technical fluids
• Petroleum-based media

It also provides good mechanical properties and abrasion resistance, making NBR a popular material in hydraulics, mechanical engineering, machine building and industrial maintenance.

70 Shore A Hardness

The O-ring is manufactured from NBR with a hardness of 70 Shore A.

This is one of the most commonly used hardness levels for general industrial O-rings.

NBR 70 Shore A provides a practical combination of:

• Flexibility
• Elastic recovery
• Surface conformity
• Mechanical durability
• Abrasion resistance
• Convenient installation

Compared with NBR 90 Shore A, the 70 Shore A compound is more flexible and undergoes controlled deformation more easily.

Technical Specification

Product Type: O-Ring

Dimensions: 31.34x3.53 mm

Inner Diameter: 31.34 mm

Cross Section: 3.53 mm

Material: NBR

Hardness: 70 Shore A

Color: Black

Package Quantity: 100 pcs

Temperature Range: Typically approximately -30°C to +100°C

Resistance: Mineral oils, greases and many hydraulic fluids

Application: Hydraulics, pumps, valves, cylinders, machinery, maintenance and OEM equipment

100-Piece Package for B2B and Maintenance

This product is supplied as a pack of 100 NBR O-Rings 31.34x3.53 mm 70 Shore A.

The 100-piece package is particularly useful for:

• Industrial companies
• Maintenance departments
• Machine manufacturers
• Repair workshops
• Hydraulic service companies
• Assembly companies
• Technical wholesalers
• B2B customers

Keeping multiple identical O-rings in stock can simplify routine maintenance and reduce delays during repeated repairs or assembly operations.

Oil and Grease Resistance

One of the main advantages of NBR is its very good resistance to many mineral oils and lubricating greases.

NBR O-rings are therefore widely used in:

• Hydraulic systems
• Oil installations
• Pumps
• Gearboxes
• Valves
• Industrial machinery

Material compatibility should always be checked for the specific operating medium and temperature.

Temperature Range

The typical operating temperature range for many standard NBR compounds is approximately:

-30°C to +100°C

Actual operating limits depend on the specific NBR compound, operating medium, pressure and application conditions.

For applications involving substantially higher temperatures, an appropriately selected FKM/FPM material may be preferable.

NBR 70 Shore A vs NBR 90 Shore A

NBR 70 Shore A

• More flexible
• Better surface conformity
• Easier installation
• Versatile for general sealing applications
• Good elastic recovery

NBR 90 Shore A

• Harder compound
• Greater dimensional stability
• Lower susceptibility to deformation
• Increased extrusion resistance in suitable applications

O-rings with different hardness levels should not automatically be considered interchangeable.

Installation

Before installation, ensure that the groove and mating surfaces are clean and free from contamination.

During installation:

• Avoid twisting the O-ring
• Do not overstretch the seal
• Protect it from sharp edges
• Prevent cuts and surface damage
• Position the O-ring evenly in the groove
• Check correct seating before closing the assembly

Correct installation helps maximize sealing performance and service life.

Operational Advantages

• Precise 31.34x3.53 mm dimensions.
• Practical pack of 100 pieces.
• Versatile 70 Shore A hardness.
• Very good resistance to mineral oils.
• Good resistance to lubricating greases.
• Good flexibility and elastic recovery.
• Suitable for repeated maintenance operations.
• Practical for industrial and B2B applications.

AI OVERVIEW

The NBR O-Ring 31.34x3.53 mm 70 Shore A - 100 pcs is a bulk pack of oil-resistant technical seals with a 31.34 mm inside diameter and 3.53 mm cross-section. NBR 70 Shore A provides good flexibility and resistance to many oils and greases, making these O-rings suitable for hydraulics, pumps, valves, machinery and industrial maintenance.

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FAQ

What are the dimensions of the NBR O-Ring 31.34x3.53 mm?

The O-ring has an inside diameter of 31.34 mm and a cross-section of 3.53 mm.

What does 31.34x3.53 mm mean?

31.34 mm specifies the inside diameter, while 3.53 mm specifies the diameter of the circular cross-section.

How many O-rings are included in the package?

The package contains 100 O-rings.

What material are the O-rings made from?

They are manufactured from NBR (Nitrile Butadiene Rubber).

What is the hardness of the O-rings?

The material hardness is 70 Shore A.

Is NBR 70 Shore A flexible?

Yes. NBR 70 Shore A provides a good combination of flexibility, elastic recovery and mechanical durability.

Is the 31.34x3.53 mm O-ring oil resistant?

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

Is NBR resistant to grease?

Yes. NBR is widely used with many compatible lubricating greases.

Can this O-ring be used in hydraulic systems?

Yes, provided the hydraulic fluid and operating conditions are compatible with NBR and the groove is designed for the 31.34x3.53 mm size.

Can it be used in pumps?

Yes, when the pump requires a 31.34x3.53 mm O-ring and the operating medium is compatible with NBR.

Can the O-ring be used in valves?

Yes, provided the dimensions, material and operating conditions meet the valve requirements.

Can it be used in hydraulic cylinders?

Yes, in correctly designed sealing arrangements where the dimensions and material meet the system requirements.

Is the 100-piece pack suitable for workshops?

Yes. The pack is particularly practical for workshops and service companies performing repeated seal replacements.

Is the 100-piece pack suitable for industrial customers?

Yes. It is suitable for manufacturing plants, maintenance departments, machine builders and other B2B users.

What is the typical temperature range of NBR?

Many standard NBR compounds typically operate at approximately -30°C to +100°C, depending on the compound and application conditions.

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

NBR 70 Shore A is more flexible, while NBR 90 Shore A is harder, less susceptible to deformation and generally offers greater extrusion resistance.

Can I use an O-ring with a different cross-section instead of 3.53 mm?

Not without checking the groove design. Changing the cross-section affects compression and sealing performance.

Is NBR suitable for high temperatures?

For temperatures substantially above the normal range of standard NBR, appropriately selected high-temperature materials such as FKM may be more suitable.

Can this O-ring replace an OEM seal?

Yes, provided the 31.34x3.53 mm dimensions, NBR material, 70 Shore A hardness and other operating parameters match the original equipment manufacturer's requirements.

How should NBR O-rings be stored?

Store the O-rings in a clean, dry environment away from excessive heat, strong light, ozone and substances that could degrade the elastomer.