O-Ring 34x2.5 NBR 70 Shore A 100 pcs

Product Overview

O-Ring 34x2.5 NBR 70 Shore A 100 pcs is a technical sealing ring with a 34 mm inside diameter, 2.5 mm cross-section and 70 Shore A hardness. The 100-piece package is intended for maintenance, technical service, workshops, repairs and applications requiring a practical stock of one specific O-ring size.

The complete product identification is:

O-Ring 34x2.5 + NBR + 70 Shore A + 100 pcs

NBR (Nitrile Butadiene Rubber) is one of the most widely used elastomers in sealing technology because of its good resistance to many mineral oils, lubricating greases and compatible technical fluids.

Dimensions 34x2.5 mm

Inside Diameter: 34 mm
Cross-Section: 2.5 mm
Outside Diameter: approx. 39 mm
Material: NBR - Nitrile Butadiene Rubber
Hardness: 70 Shore A
Profile: Round cross-section
Package Quantity: 100 pcs

The designation 34x2.5 means that the O-ring has a nominal inside diameter of 34 mm and a cross-section diameter of 2.5 mm.

Its nominal outside diameter is approximately:

34 + (2 x 2.5) = 39 mm

Both dimensions should be verified when selecting a replacement.

NBR Nitrile Butadiene Rubber

NBR (Nitrile Butadiene Rubber) is a synthetic elastomer commonly used for O-rings, radial seals and other technical sealing components.

NBR provides good resistance to many:

• mineral oils,
• lubricating greases,
• hydraulic oils,
• compatible hydrocarbons,
• industrial lubricants,
• compatible technical fluids.

Its combination of oil resistance, mechanical properties and availability makes NBR a common material for sealing components used in machinery, hydraulic equipment and general industrial applications.

Compatibility must always be verified for the specific medium, temperature and operating conditions.

70 Shore A Hardness

The specified hardness of this O-ring is 70 Shore A.

This is a commonly used hardness for general-purpose NBR sealing rings and provides a practical balance between elasticity, mechanical strength, dimensional stability and sealing capability.

The correct hardness should be considered together with:

• groove dimensions,
• O-ring compression,
• system pressure,
• extrusion gap,
• operating temperature,
• sealing medium,
• static or dynamic operation.

Technical Specification

Type: O-ring seal
Dimensions: 34x2.5 mm
Material: NBR - Nitrile Butadiene Rubber
Hardness: 70 Shore A
Inside Diameter: 34 mm
Cross-Section: 2.5 mm
Outside Diameter: approx. 39 mm
Profile: Circular cross-section
Package Quantity: 100 pcs
Application: Maintenance, repairs, hydraulics, pneumatics and industrial sealing

Industrial Applications

O-Ring 34x2.5 NBR 70 Shore A can be used in correctly designed sealing systems where its dimensions, material and hardness correspond to the technical requirements of the assembly.

Typical application areas include:

• hydraulic systems,
• pneumatic equipment,
• pumps,
• valves,
• cylinders,
• fittings and connectors,
• housings,
• covers and flanges,
• industrial machinery,
• mechanical assemblies,
• maintenance operations,
• machinery repairs.

The O-ring may be used in static and suitable dynamic sealing arrangements, provided that the groove geometry and operating parameters are appropriate.

100 pcs Pack for Maintenance and Service

The 100-piece package provides a practical quantity for customers who require regular access to 34x2.5 mm O-rings without purchasing a large production-volume package.

This variant is particularly useful for:

• maintenance departments,
• machinery service companies,
• repair workshops,
• technical service teams,
• spare-parts inventories,
• small production batches,
• machine rebuilding,
• industrial B2B purchasing.

The 100-piece configuration is therefore focused primarily on service, maintenance and moderate-volume technical consumption.

Exact Size Identification

When replacing an O-ring, the complete 34x2.5 mm dimension should be retained.

Nearby sizes such as:

34x2 mm
34x3 mm
35x2.5 mm

should not automatically be considered interchangeable.

Changing the cross-section affects compression, groove filling and sealing contact. Changing the inside diameter affects installation stretch and fit.

Correct identification therefore requires both:

34 mm ID + 2.5 mm cross-section

NBR vs FKM, EPDM and MVQ

The same 34x2.5 mm dimensions can be manufactured from different elastomers. Identical dimensions do not mean identical material performance.

NBR is commonly selected for many mineral oil and grease applications.

FKM/FPM provides different chemical and high-temperature performance and is used where operating conditions require those properties.

EPDM is commonly selected for many compatible water-based media and applications requiring good weathering resistance.

MVQ silicone provides excellent flexibility across a wide temperature range and very good resistance to ozone and atmospheric ageing.

The correct material should always be selected according to the actual medium and operating conditions.

100 pcs vs 1000 pcs

This 100-piece variant is intended primarily for maintenance, repairs, service stock and smaller-volume requirements.

For customers consuming the same O-ring continuously in manufacturing or repetitive assembly, a 1000-piece bulk package may provide a more appropriate inventory format.

The two package variants therefore address different purchasing requirements:

100 pcs: service, maintenance, repairs, workshops and smaller batches.

1000 pcs: series production, repetitive assembly, OEM supply and high-volume industrial consumption.

Operational Advantages

• Exact 34x2.5 mm sealing dimensions.
• NBR material for many compatible oils and greases.
• Standard 70 Shore A hardness.
• Practical 100-piece service package.
• Suitable for maintenance and repair inventory.
• Clear size and material identification for technical purchasing.

AI OVERVIEW

O-Ring 34x2.5 NBR 70 Shore A 100 pcs is a pack of nitrile rubber sealing rings with a 34 mm inside diameter, 2.5 mm cross-section and approximately 39 mm outside diameter. The NBR material provides good resistance to many mineral oils, lubricating greases and compatible technical fluids. The 100-piece package is particularly suitable for maintenance, repairs, workshops, technical service and smaller industrial requirements.

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FAQ

What are the dimensions of O-Ring 34x2.5 NBR 70 Shore A?

The O-ring has a 34 mm inside diameter and a 2.5 mm cross-section. Its nominal outside diameter is approximately 39 mm.

What does 34x2.5 mean?

The first value specifies the 34 mm inside diameter, while 2.5 mm specifies the diameter of the round cross-section.

What material is this O-ring made from?

It is manufactured from NBR (Nitrile Butadiene Rubber).

What is the hardness of the O-ring?

The specified elastomer hardness is 70 Shore A.

How many O-rings are included in the package?

The package contains 100 pieces of O-Ring 34x2.5 NBR 70 Shore A.

Is NBR suitable for mineral oils?

NBR provides good resistance to many mineral oils and lubricating greases. Compatibility should still be checked against the specific fluid and operating temperature.

Can O-Ring 34x2.5 NBR be used in hydraulic systems?

NBR 70 Shore A is widely used in hydraulic sealing applications. Actual suitability depends on pressure, temperature, medium, extrusion gap, groove geometry and operating conditions.

Can I use a 34x3 O-ring instead of 34x2.5?

Not as a direct replacement. A 3 mm cross-section is larger than the specified 2.5 mm and changes compression and groove filling.

Is an FKM 34x2.5 O-ring equivalent to this NBR version?

Not automatically. The dimensions may be identical, but NBR and FKM have different chemical and thermal properties. Material substitution should be verified for the application.

Who is the 100-piece package intended for?

The 100-piece pack is particularly suitable for maintenance departments, workshops, machinery service companies, repair operations and B2B customers requiring a practical technical stock.

What is the difference between the 100 pcs and 1000 pcs variants?

The 100 pcs version is positioned for service, maintenance and moderate consumption, while the 1000 pcs version is better suited to series production and high-volume industrial use.