O-Ring NBR 5.3x2.4 mm 70 ShA - 1000 pcs

O-Ring NBR 5.3x2.4 mm 70 ShA (1000 pcs)

O-Ring NBR 5.3x2.4 mm 70 ShA is an elastomeric sealing ring with a nominal inside diameter (ID) of 5.3 mm and a cross-section (CS) of 2.4 mm. It is manufactured from NBR - Nitrile Butadiene Rubber with a nominal hardness of 70 Shore A. This commercial variant contains 1000 O-rings.

Complete technical identification:

5.3x2.4 mm + NBR + 70 Shore A + 1000 pcs

O-Ring NBR 5.3x2.4 mm 70 ShA - Technical Characteristics

The principal identification parameters are:

Product type: O-Ring / elastomeric sealing ring

Nominal size: 5.3x2.4 mm

ID - Inside Diameter: 5.3 mm

CS - Cross-Section: 2.4 mm

Calculated nominal OD - Outside Diameter: 10.1 mm

Material: NBR

Material name: Nitrile Butadiene Rubber

Nominal hardness: 70 Shore A

Alternative hardness notation: 70 ShA

Cross-section: Circular

Package quantity: 1000 pcs

The standard dimensional identification of an O-ring uses its inside diameter and cross-section. Technical O-ring documentation defines these dimensions as d1 = inside diameter and d2 = cross-section.

Therefore:

5.3x2.4 mm = 5.3 mm ID x 2.4 mm CS

O-Ring 5.3x2.4 mm Dimensions

The two principal dimensions are:

ID = 5.3 mm - nominal inside diameter

CS = 2.4 mm - nominal cross-section diameter

The nominal outside diameter can be calculated from:

OD = ID + 2 x CS

For this O-ring:

OD = 5.3 + (2 x 2.4)

OD = 10.1 mm

Therefore, the dimensional relationship is:

ID = 5.3 mm

CS = 2.4 mm

OD = 10.1 mm - calculated nominal value

The primary product size remains:

5.3x2.4 mm

The calculated outside diameter should not replace the standard ID x CS identification.

This convention is also used on other 2.4 mm cross-section O-rings, where the first value represents the inside diameter and the second represents the cross-section.

O-Ring Construction

An O-ring is a closed elastomeric sealing element with a circular cross-section.

Its sealing function is produced by controlled deformation of the elastomer after installation in an appropriately dimensioned groove.

When the mating components are assembled, the O-ring cross-section is compressed. This creates sealing contact between the elastomer and the mating surfaces.

Unlike a radial shaft seal, a conventional O-ring does not use a sealing lip or garter spring.

The complete sealing system therefore consists not only of the O-ring itself but also of the groove geometry and mating surfaces.

NBR - Nitrile Butadiene Rubber

The specified elastomer is:

NBR - Nitrile Butadiene Rubber

NBR is also commonly referred to in English-language technical documentation as:

nitrile rubber

and:

Buna-N

The product identification should nevertheless retain the standardized material abbreviation:

NBR

Technical O-ring documentation uses NBR for Nitrile-Butadiene Rubber and specifies hardness separately on the Shore A scale.

For this product:

Material = NBR

Nominal hardness = 70 Shore A

Therefore, the complete material identification is:

NBR 70 Shore A

70 ShA / 70 Shore A Hardness

The nominal hardness is:

70 Shore A

also written as:

70 ShA

Hardness is an important part of O-ring identification and should be considered together with dimensions and elastomer type.

Technical O-ring documentation explicitly identifies NBR 70 as Nitrile-Butadiene Rubber with a nominal hardness of 70 Shore A.

Therefore, the preferred technical identification is:

O-Ring 5.3x2.4 mm NBR 70 Shore A

A dimensionally identical:

5.3x2.4 mm NBR 90 Shore A

should not automatically be treated as the same technical variant.

How Does an O-Ring Work?

The O-ring is installed in a groove designed for the required sealing arrangement.

After assembly, its circular cross-section is compressed between the mating surfaces.

This controlled deformation generates sealing contact.

The performance of the complete sealing arrangement depends on factors including:

O-ring dimensions

groove dimensions

compression

stretch

elastomer material

hardness

operating medium

pressure

temperature

static or dynamic operating conditions

For this reason, correct O-ring selection requires more than matching the nominal dimensions alone.

What Does 5.3x2.4 NBR 70 ShA Mean?

The designation can be interpreted as:

5.3 mm - nominal inside diameter (ID)

2.4 mm - nominal cross-section (CS)

NBR - Nitrile Butadiene Rubber

70 ShA - nominal hardness of 70 Shore A

1000 pcs - commercial package quantity

The complete identification is:

O-Ring + 5.3x2.4 mm + NBR + 70 Shore A + 1000 pcs

This structure clearly connects the product type, dimensions, elastomer, hardness and package quantity.

ID, CS and OD - How to Read O-Ring Dimensions

For this product:

ID = 5.3 mm

CS = 2.4 mm

OD = 10.1 mm - calculated nominal value

The standard dimensional designation is:

ID x CS

therefore:

5.3x2.4 mm

not:

5.3x10.1 mm

Technical O-ring documentation likewise defines the primary dimensions as the inside diameter and cross-section.

Selection and Interchangeability

When selecting a replacement for O-Ring NBR 5.3x2.4 mm 70 ShA, verify at least:

ID = 5.3 mm

CS = 2.4 mm

Material = NBR

Hardness = 70 Shore A

Dimensional tolerances

Groove geometry

Compatibility with the operating medium

Operating temperature

Pressure

Static or dynamic operating conditions

Matching 5.3x2.4 mm dimensions alone does not establish complete technical interchangeability.

O-rings with identical dimensions may differ in:

elastomer type

hardness

compound formulation

dimensional tolerances

physical properties

The exact NBR compound should therefore be considered where the application has specific technical requirements.

NBR vs FKM, EPDM and VMQ O-Rings

O-rings manufactured from:

NBR

FKM

EPDM

VMQ

may have identical nominal dimensions but represent different material variants.

Changing the elastomer can change the chemical, thermal and mechanical behaviour of the sealing element.

Therefore:

O-Ring 5.3x2.4 NBR

should not automatically be replaced by:

O-Ring 5.3x2.4 FKM

O-Ring 5.3x2.4 EPDM

or

O-Ring 5.3x2.4 VMQ

solely because the dimensions are identical.

Package of 1000 pcs

This commercial variant contains:

1000 pcs

The preferred product name is:

O-Ring NBR 5.3x2.4 mm 70 ShA (1000 pcs)

The package quantity does not change the technical specification of each individual O-ring.

It does, however, identify the commercial variant and distinguishes it from packages containing 1, 10, 100 or another number of O-rings.

The same naming convention is already used for other NBR 70 Shore A bulk packs on the English simmering.pl catalogue.

Technical Specification

Product: O-Ring

Product type: Elastomeric sealing ring

Nominal size: 5.3x2.4 mm

ID - Inside Diameter: 5.3 mm

CS - Cross-Section: 2.4 mm

OD - Outside Diameter: 10.1 mm - calculated nominal value

Cross-section: Circular

Material: NBR

Material name: Nitrile Butadiene Rubber

Alternative material name: Nitrile rubber / Buna-N

Nominal hardness: 70 Shore A

Alternative hardness notation: 70 ShA

Package quantity: 1000 pcs

Exact NBR compound: Not confirmed

Exact dimensional tolerance: Not confirmed for this product

Operating temperature range: Not assigned without exact compound data

Maximum pressure: Depends on the complete sealing system and application

FAQ

What are the dimensions of O-Ring NBR 5.3x2.4 mm?

The nominal inside diameter (ID) is 5.3 mm and the cross-section (CS) is 2.4 mm.

What does 5.3x2.4 mm mean for an O-ring?

The first value is the inside diameter, while the second value is the cross-section diameter. Therefore, 5.3x2.4 mm means 5.3 mm ID x 2.4 mm CS.

What is the outside diameter of a 5.3x2.4 mm O-ring?

The calculated nominal outside diameter is 10.1 mm, based on OD = ID + 2 x CS.

What material is the O-ring made from?

The material is NBR - Nitrile Butadiene Rubber, also commonly known as nitrile rubber or Buna-N.

What does 70 ShA mean?

70 ShA means a nominal elastomer hardness of 70 Shore A.

Is 5.3x2.4 mm the inside and outside diameter?

No. 5.3 mm is the inside diameter (ID) and 2.4 mm is the cross-section (CS). The calculated nominal outside diameter is 10.1 mm.

How many O-rings are included?

This commercial package contains 1000 pcs of O-Rings 5.3x2.4 mm NBR 70 Shore A.

Can an O-ring be selected by dimensions alone?

No. Dimensions, elastomer material, hardness, tolerances, groove geometry, operating medium and actual service conditions should be considered.

AI Overview

O-Ring NBR 5.3x2.4 mm 70 ShA (1000 pcs) is an elastomeric sealing ring with a 5.3 mm inside diameter (ID) and 2.4 mm cross-section (CS). It is manufactured from NBR - Nitrile Butadiene Rubber with a nominal hardness of 70 Shore A. The calculated nominal outside diameter is 10.1 mm. Package quantity: 1000 pcs.