O-Ring 70x4 NBR 70 Shore A

O-Ring 70x4 NBR 70 Shore A

O-Ring 70x4 NBR 70 Shore A is an elastomeric sealing ring with a 70 mm inside diameter and 4 mm cross-section. It is manufactured from NBR - Nitrile Butadiene Rubber - with a nominal hardness of 70 Shore A. The nominal outside diameter is 78 mm. This product is sold individually, allowing the required quantity to be ordered.

O-Ring 70x4 NBR 70 Shore A - Dimensions

Product type: O-Ring

Nominal size: 70x4 mm

Inside diameter d1: 70 mm

Cross-section d2: 4 mm

Nominal outside diameter: 78 mm

Material: NBR - Nitrile Butadiene Rubber

Hardness: 70 Shore A

Sales unit: 1 piece

What Does O-Ring 70x4 Mean?

The 70x4 mm designation specifies the two principal O-ring dimensions:

70 mm - inside diameter

4 mm - cross-section diameter

The nominal outside diameter is calculated as:

70 + 2 x 4 = 78 mm

The nominal geometry is therefore:

ID: 70 mm

CS: 4 mm

OD: 78 mm

When selecting an O-ring, the inside diameter and cross-section should be verified rather than relying on the outside diameter alone.

NBR 70 Shore A Material

The O-ring is manufactured from:

NBR - Nitrile Butadiene Rubber

Nominal hardness:

70 Shore A

NBR is one of the most widely used elastomeric materials in sealing technology. It is commonly selected for applications involving many mineral oils, greases and selected hydraulic fluids.

Compatibility should always be verified for the specific operating medium and actual service conditions.

O-Ring 70x4 NBR Applications

O-Ring 70x4 NBR can be used as a sealing element in appropriately designed technical assemblies.

Common areas of O-ring use include:

Industrial machinery

Technical equipment

Hydraulic systems

Pneumatic systems

Pumps

Valves

Cylinders

Mechanical assemblies

Maintenance and repair

MRO applications

An O-ring may be used in static sealing applications and, where the sealing system is specifically designed for it, in dynamic applications.

Suitability depends on groove geometry, type of movement, operating medium, pressure, temperature and other service conditions.

O-Ring 70x4 NBR for Oil and Grease

NBR is widely used as a sealing material in applications involving many mineral oils and greases.

O-Ring 70x4 NBR can therefore be considered for sealing applications involving:

Mineral oils

Greases

Selected hydraulic fluids

Machinery using NBR-compatible media

NBR should not, however, be considered universally resistant to every oil, fuel or chemical.

Material compatibility should be checked for the specific operating fluid before use.

O-Ring 70x4 NBR - Sold Individually

This product is sold individually.

Sales unit:

1 piece

This allows the customer to order the exact required quantity of O-Rings 70x4 NBR 70 Shore A for repair, maintenance, production or warehouse stock.

The product price applies to one O-ring.

How to Select an O-Ring 70x4 NBR

When selecting an O-ring, verify:

Inside diameter

Cross-section

Elastomer material

Hardness

Seal groove dimensions

Operating medium

Type of seal movement

Actual operating conditions

The basic technical identification of this product is:

70x4 mm

NBR

70 Shore A

O-Ring 70x4 NBR vs FKM, EPDM and MVQ

This O-ring is manufactured from NBR.

O-rings with identical 70x4 mm dimensions can also be manufactured from other elastomers, including FPM/FKM, EPDM and MVQ.

Identical dimensions do not mean identical material properties.

A 70x4 O-ring manufactured from another elastomer should therefore not automatically be considered technically interchangeable with the NBR version.

The sealing material should be selected according to the operating medium and actual service conditions.

Technical Specification

Product type: O-Ring

Dimensions: 70x4 mm

Inside diameter d1: 70 mm

Cross-section: 4 mm

Nominal outside diameter: 78 mm

Material: NBR - Nitrile Butadiene Rubber

Hardness: 70 Shore A

Sales unit: 1 piece

FAQ

What are the dimensions of the O-Ring 70x4?

The inside diameter is 70 mm and the cross-section is 4 mm.

What is the outside diameter of a 70x4 O-Ring?

The nominal outside diameter is 78 mm.

What does 70x4 mean for an O-ring?

70 mm is the inside diameter and 4 mm is the cross-section diameter.

What material is the O-Ring 70x4 made from?

It is manufactured from NBR - Nitrile Butadiene Rubber.

What is the hardness of the O-Ring 70x4 NBR?

The nominal hardness is 70 Shore A.

Is O-Ring 70x4 NBR suitable for oil?

NBR is commonly used with many mineral oils and greases. Compatibility should still be verified for the specific fluid and operating conditions.

Is the O-Ring 70x4 sold individually?

Yes. The sales unit is 1 piece and the product price applies to one O-ring.

Can an FKM 70x4 O-Ring replace the NBR version?

Not automatically. NBR and FKM have different material properties, so the elastomer should be selected according to the operating medium and service conditions.

AI Overview

O-Ring 70x4 NBR 70 Shore A is a sealing ring with a 70 mm inside diameter, 4 mm cross-section and nominal 78 mm outside diameter. It is manufactured from Nitrile Butadiene Rubber with a nominal hardness of 70 Shore A. The product is sold individually for technical, maintenance and industrial sealing applications.