O-Ring 26x2.5 NBR 70 Shore A

O-Ring 26x2.5 NBR 70 Shore A - 100 pcs

O-Ring 26x2.5 NBR 70 Shore A is a technical sealing ring with a 26 mm inside diameter and 2.5 mm cross-section. It is manufactured from NBR - Nitrile Butadiene Rubber with a nominal hardness of 70 Shore A. Its circular cross-section enables controlled compression within an appropriately designed sealing groove. The package contains 100 pcs.

O-Ring 26x2.5 mm Dimensions

The principal dimensions are:

ID = 26 mm - inside diameter

CS = 2.5 mm - cross-section diameter

OD = 31 mm - calculated nominal outside diameter

The O-ring size is specified as:

ID x CS = 26x2.5 mm

The outside diameter is calculated using:

OD = ID + 2 x CS

For this size:

26 + (2 x 2.5) = 31 mm

The ID and CS dimensions are the primary dimensional parameters used to identify an O-ring.

NBR - Nitrile Butadiene Rubber

The O-ring is manufactured from:

NBR - Nitrile Butadiene Rubber

NBR is a widely used elastomer in sealing technology.

When selecting an O-ring for a specific application, material compatibility should be evaluated against the working medium and actual operating conditions.

The NBR designation alone does not define every operating limit because the properties also depend on the specific elastomer compound.

70 Shore A Hardness

The nominal hardness of this O-ring is:

70 Shore A

also written as:

70 ShA

Hardness is an important technical parameter of an elastomeric sealing ring.

The basic product identification should therefore include:

26x2.5 + NBR + 70 Shore A

An O-ring with identical dimensions but a different material or hardness is not the same technical variant.

How Does an O-Ring Work?

An O-ring has a circular cross-section and is installed in an appropriately designed sealing groove.

When the mating components are assembled, the elastomer is compressed in a controlled manner. This deformation creates contact between the O-ring and the sealing surfaces.

Correct sealing performance depends on several factors, including:

O-ring dimensions

groove geometry

compression

material and hardness

working medium

temperature and pressure

static or dynamic operation

The O-ring should therefore be selected as part of the complete sealing arrangement rather than by dimensions alone.

Typical Applications of NBR O-Rings

NBR O-rings are widely used as sealing elements in technical equipment and machinery, including:

hydraulic systems

pneumatic systems

pumps

valves

cylinders

technical fittings

industrial machinery

mechanical equipment

machine servicing

maintenance and MRO

The suitability of the exact 26x2.5 NBR 70 Shore A specification should always be verified against the requirements of the specific sealing application.

How to Select an O-Ring 26x2.5 NBR

Before ordering, verify the four principal parameters:

ID - 26 mm

CS - 2.5 mm

Material - NBR

Hardness - 70 Shore A

The groove design, working medium and actual operating conditions should then be considered.

A used O-ring may be stretched, flattened or permanently deformed. Measurements taken from an old seal may therefore differ from its original nominal dimensions.

O-Ring 26x2.5 Interchangeability

Matching 26x2.5 mm dimensions alone do not confirm complete interchangeability.

A potential replacement should also be compared for:

inside diameter ID

cross-section CS

elastomer material

hardness

application requirements

An FKM, EPDM or VMQ O-ring 26x2.5 mm has a different material specification from an NBR 26x2.5 mm O-ring.

Pack of 100 pcs

This offer contains:

100 pcs of O-Rings 26x2.5 NBR 70 Shore A

The 100-piece package is suitable for service departments, maintenance operations, workshops, production facilities and industrial users requiring a stock quantity of one specific O-ring size.

Sales unit:

100 pcs

Technical Specification

Product: O-Ring

Size: 26x2.5 mm

Inside diameter ID: 26 mm

Cross-section CS: 2.5 mm

Calculated outside diameter OD: 31 mm

Material: NBR

Material name: Nitrile Butadiene Rubber

Nominal hardness: 70 Shore A

Cross-section: Circular

Package quantity: 100 pcs

FAQ - O-Ring 26x2.5 NBR 70 Shore A

What does 26x2.5 mm mean?

26 mm is the nominal inside diameter ID, while 2.5 mm is the cross-section diameter CS.

What is the outside diameter of this O-ring?

The calculated nominal outside diameter is 31 mm.

What material is this O-ring made from?

It is manufactured from NBR - Nitrile Butadiene Rubber.

What does 70 Shore A mean?

It is the nominal hardness of the elastomer measured on the Shore A hardness scale.

Are all 26x2.5 mm O-rings the same?

No. In addition to dimensions, the material and hardness must be checked. This product is specified as 26x2.5 NBR 70 Shore A.

How many O-rings are included?

The package contains 100 pcs.

AI Overview

O-Ring 26x2.5 NBR 70 Shore A - 100 pcs is a technical sealing ring with a 26 mm inside diameter and 2.5 mm cross-section, manufactured from Nitrile Butadiene Rubber with a nominal hardness of 70 Shore A. Its calculated nominal outside diameter is 31 mm. The package contains 100 O-rings.