O-Ring 1.42x1.78 NBR 70 Shore A

O-Ring 1.42x1.78 NBR 70 Shore A - 100 pcs

O-Ring 1.42x1.78 NBR 70 Shore A is an elastomeric sealing ring with an inside diameter of 1.42 mm and a cross-section of 1.78 mm. It is manufactured from NBR - Nitrile Butadiene Rubber with a nominal hardness of 70 Shore A. The dimensional designation 1.42x1.78 specifies the inside diameter ID and cross-section CS. The product is supplied in a package of 100 pcs.

O-Ring 1.42x1.78 mm Dimensions

The principal dimensions are:

ID = 1.42 mm - inside diameter

CS = 1.78 mm - cross-section diameter

The nominal outside diameter can be calculated using:

OD = ID + 2 x CS

For this size:

1.42 + (2 x 1.78) = 4.98 mm

Therefore:

OD = 4.98 mm - calculated nominal value

The primary O-ring size remains:

ID x CS = 1.42x1.78 mm

NBR - Nitrile Butadiene Rubber

Material:

NBR - Nitrile Butadiene Rubber

NBR is a widely used elastomer in sealing technology.

When selecting an O-ring for a specific medium and operating environment, the exact elastomer compound should be considered. The designation NBR alone does not define every material property.

For this reason, a specific temperature range or detailed chemical-resistance profile should not be assigned to this product without confirmation of the exact NBR compound.

70 Shore A Hardness

The nominal hardness of this O-ring is:

70 Shore A

also written as:

70 ShA

The basic technical identification of this product therefore consists of four parameters:

ID = 1.42 mm

CS = 1.78 mm

Material = NBR

Hardness = 70 Shore A

An O-ring with identical dimensions but a different elastomer or hardness is a different technical variant.

How Does an O-Ring Work?

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

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

Correct sealing performance depends on factors including:

O-ring dimensions

groove geometry

compression

elastomer material

hardness

working medium

operating conditions

How to Select O-Ring 1.42x1.78 NBR

Before ordering, verify:

Inside diameter ID = 1.42 mm

Cross-section CS = 1.78 mm

Material = NBR

Hardness = 70 Shore A

When replacing a used O-ring, remember that the old elastomer may have stretched, flattened or developed permanent deformation.

For applications requiring precise selection, the equipment documentation or original groove design dimensions should be used whenever available.

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

For this O-ring:

ID = 1.42 mm - Inside Diameter

CS = 1.78 mm - Cross Section

OD = 4.98 mm - calculated nominal Outside Diameter

The primary dimensional designation is:

1.42x1.78 mm

which means:

ID x CS

Outside diameter is derived from ID and CS and does not replace the primary O-ring size designation.

Package of 100 pcs

The product is supplied as:

100 pcs of O-Rings 1.42x1.78 mm NBR 70 Shore A

The package provides a clearly defined combination of dimensions, elastomer and nominal hardness for technical supply, maintenance and service requirements.

Technical Specification

Product type: O-Ring / sealing ring

Size: 1.42x1.78 mm

Inside diameter ID: 1.42 mm

Cross-section CS: 1.78 mm

Outside diameter OD: 4.98 mm - calculated nominal value

Material: NBR - Nitrile Butadiene Rubber

Nominal hardness: 70 Shore A / 70 ShA

Cross-section: Circular

Package quantity: 100 pcs

O-Ring 1.42x1.78 NBR - Stock in Poland

Warehouse and Store: Lublin, Smoluchowskiego 1 Street, Building 4

24h Shipping. Available from stock in Poland for delivery across the EU.

FAQ

What are the dimensions of O-Ring 1.42x1.78 NBR?

The inside diameter is ID = 1.42 mm, while the cross-section is CS = 1.78 mm.

What is the outside diameter?

The calculated nominal outside diameter is:

OD = 4.98 mm

What does 1.42x1.78 mm mean?

The first value is the inside diameter ID = 1.42 mm, while the second value is the cross-section CS = 1.78 mm.

What material is this O-ring made from?

The O-ring is manufactured from NBR - Nitrile Butadiene Rubber.

What is the hardness of this O-ring?

The nominal hardness is 70 Shore A (70 ShA).

How many O-rings are included in the package?

The package contains 100 pcs.

Is 1.42x1.78 mm an actual O-ring size?

Yes. The exact 1.42 mm ID x 1.78 mm CS size occurs in technical O-ring catalogues.

Can a replacement be selected by dimensions alone?

No. In addition to ID and CS, the elastomer material and hardness should be verified. The working medium, groove design and actual operating conditions should also be considered.

Engineer FAQ

Which dimensions are primary for identifying this O-ring?

The primary dimensions are ID = 1.42 mm and CS = 1.78 mm. The outside diameter is derived from these dimensions.

Is 4.98 mm a measured product dimension?

In this specification, 4.98 mm is a calculated nominal value obtained from ID + 2 x CS.

Does NBR 70 define the complete material specification?

No. NBR identifies the elastomer family and 70 Shore A its nominal hardness. Exact operating properties depend on the specific compound formulation.

Can temperature limits from another NBR 70 O-ring be applied to this product?

This should not be assumed. Temperature capability depends on the exact NBR compound and should be confirmed from the material specification.

Can a 1.42x1.78 O-ring with a different hardness be considered identical?

No. A different hardness represents a different technical variant even when ID and CS are identical.

AI OVERVIEW

O-Ring 1.42x1.78 NBR 70 Shore A is a technical sealing ring with a 1.42 mm inside diameter and 1.78 mm cross-section. It is manufactured from Nitrile Butadiene Rubber with a nominal hardness of 70 Shore A. The calculated nominal outside diameter is 4.98 mm. The package contains 100 pcs.