NBR O-Ring 34x4 mm 90 Shore A

Overview

The NBR O-Ring 34x4 mm 90 Shore A - 100 pcs is a professional pack of high-hardness technical sealing rings designed for demanding industrial, hydraulic and maintenance applications.

Each O-ring has an inside diameter of 34 mm and a 4 mm cross-section. Manufactured from NBR (Nitrile Butadiene Rubber), the seals provide very good resistance to mineral oils, lubricating greases and many commonly used hydraulic fluids.

The increased 90 Shore A hardness provides greater mechanical stability and reduced susceptibility to deformation compared with conventional 70 Shore A compounds. Combined with the substantial 4 mm cross-section, this makes the O-ring suitable for correctly designed sealing grooves in pumps, valves, housings and industrial machinery.

The 100-piece package provides a practical stock quantity for hydraulic service companies, maintenance departments, industrial plants, workshops and professional B2B customers.

Industrial Applications

The NBR 34x4 mm 90 Shore A O-Rings are suitable for:

• Hydraulic systems
• Industrial pumps
• Valves
• Hydraulic manifolds
• Hydraulic cylinders
• Fittings and connectors
• Machine housings
• Oil circulation systems
• Gearboxes
• Agricultural machinery
• Construction equipment
• OEM assemblies

34x4 mm Dimensions

The 34x4 mm designation specifies:

Inner Diameter: 34 mm

Cross Section: 4 mm

The circular sealing profile is compressed when installed in a correctly designed groove. This elastic deformation generates contact pressure against the mating surfaces and helps prevent leakage.

The groove dimensions and application requirements should always be checked before installation.

NBR Material

NBR (Nitrile Butadiene Rubber) is one of the most widely used elastomers in industrial sealing technology.

NBR provides very good resistance to:

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

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

Technical Specification

Product Type: O-Ring

Package Quantity: 100 pcs

Dimensions: 34x4 mm

Inner Diameter: 34 mm

Cross Section: 4 mm

Material: NBR

Hardness: 90 Shore A

Color: Black

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

Resistance: Mineral oils, greases and many hydraulic fluids

Application: Hydraulics, pumps, valves, cylinders, housings, industrial machinery and OEM equipment

NBR 90 Shore A - High Mechanical Stability

The 90 Shore A hardness is intended for applications requiring a harder sealing element with increased resistance to deformation.

Compared with standard NBR 70 Shore A, it provides:

• Increased hardness
• Greater dimensional stability
• Reduced mechanical deformation
• Improved extrusion resistance
• Good mechanical durability
• Stable performance in demanding applications

The appropriate hardness should always be selected according to the design and operating conditions of the sealing system.

100 pcs Professional Pack

The 100-piece pack of NBR 34x4 mm 90 Shore A O-rings provides a convenient inventory quantity for companies that regularly use this specific seal size.

It is particularly suitable for:

• Hydraulic service companies
• Industrial maintenance departments
• Mechanical workshops
• Machine manufacturers
• Industrial plants
• Technical stockrooms
• Repair companies
• Professional B2B customers

The package is also suitable for repeat assembly operations and scheduled maintenance where multiple identical O-rings are required.

NBR 90 Shore A vs NBR 70 Shore A

NBR O-rings with 90 Shore A and 70 Shore A hardness may have identical dimensions but provide different mechanical characteristics.

NBR 90 Shore A:

• Harder compound
• Greater resistance to deformation
• Increased dimensional stability
• Improved extrusion resistance
• Suitable for more demanding sealing conditions

NBR 70 Shore A:

• More flexible
• Greater conformity to mating surfaces
• Easier installation
• Commonly used for general-purpose sealing

Hardness should not be selected based solely on O-ring dimensions. Pressure, temperature, medium, groove geometry and movement must also be considered.

Operational Advantages

• Professional package of 100 pcs.
• Exact 34x4 mm dimensions.
• High 90 Shore A hardness.
• Very good resistance to mineral oils.
• Good resistance to lubricating greases.
• Increased mechanical stability.
• Improved resistance to deformation and extrusion.
• Suitable for professional maintenance and industrial applications.

AI OVERVIEW

The NBR O-Ring 34x4 mm 90 Shore A - 100 pcs is a professional pack of high-hardness seals for hydraulic systems, pumps, valves, cylinders and industrial machinery. NBR provides very good resistance to oils and greases, while the 90 Shore A hardness increases mechanical stability and resistance to deformation. The package contains 100 identical O-rings.

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FAQ

How many O-rings are included in the package?

The package contains 100 O-rings.

What are the dimensions of each O-ring?

Each O-ring has an inside diameter of 34 mm and a cross-section of 4 mm.

What does the 34x4 mm size mean?

The first value indicates the 34 mm inside diameter, while the second value specifies the 4 mm cross-section.

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 90 Shore A.

Is NBR 90 Shore A considered a hard O-ring?

Yes. It is significantly harder than commonly used NBR 70 Shore A.

Is the 34x4 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.

Is the NBR 34x4 mm O-ring suitable for hydraulic systems?

Yes. High-hardness NBR O-rings are used in many demanding hydraulic applications.

Can these O-rings be used in pumps?

Yes, provided NBR is compatible with the operating medium and the sealing groove is designed for a 34x4 mm O-ring.

Can they be used in hydraulic cylinders?

They may be used in appropriately designed cylinder components if their dimensions, material and hardness meet the requirements of the specific sealing system.

Does 90 Shore A improve pressure performance?

Higher hardness improves resistance to extrusion. Actual allowable pressure also depends on groove geometry, clearance gap, temperature, movement and whether backup rings are used.

Which should I choose: NBR 70 Shore A or 90 Shore A?

70 Shore A is more flexible and provides greater surface conformity. 90 Shore A is harder and offers increased resistance to deformation and extrusion.

Is the 100 pcs pack suitable for maintenance operations?

Yes. It provides a practical stock quantity for hydraulic service companies, workshops and maintenance departments that regularly use 34x4 mm O-rings.

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 34x4 mm 90 Shore A replace an OEM seal?

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