O-ring 130x7 NBR 70 ShA

O-ring 130x7 NBR 70 ShA is an elastomeric sealing ring with a nominal inside diameter of 130 mm and a cross-section of 7 mm. It is made from NBR (nitrile butadiene rubber) with a hardness of 70 Shore A. Correct selection requires consideration of the groove geometry, operating medium, temperature, pressure and static or dynamic operating conditions.

Technical data

What does O-ring size 130x7 mean?

The designation 130x7 mm defines the two primary dimensions of the O-ring:

• 130 mm - nominal inside diameter ID
• 7 mm - cross-section CS

The 130 mm dimension does not refer to the outside diameter.

Based on the nominal geometry, the approximate outside diameter is:

130 mm + 2 x 7 mm = 144 mm

For identification and ordering, however, the primary size remains 130x7 mm, meaning inside diameter x cross-section.

NBR material

NBR, or nitrile butadiene rubber, is one of the most widely used elastomers for technical sealing applications. NBR O-rings are commonly used in applications involving many mineral oils, greases and other media compatible with the specific NBR compound.

The NBR designation alone does not define all operating limits. Compatibility should always be assessed according to the specific medium, temperature, pressure and operating conditions.

What does 70 ShA mean?

70 ShA, or 70 Shore A, specifies the nominal hardness of the elastomer. It is a commonly used hardness for NBR O-rings in many standard sealing applications.

Hardness influences the deformation characteristics of the O-ring and its behaviour after installation in the groove.

An O-ring 130x7 NBR 70 ShA should not automatically be replaced by a 90 ShA version simply because both products have identical dimensions.

Applications of O-ring 130x7 NBR

O-ring 130x7 NBR can be used as a sealing element in appropriately designed technical connections, machinery, equipment and industrial installations.

A specific application should not be determined from the 130x7 mm dimensions alone. The operating medium, temperature, pressure, groove geometry and type of movement must also be considered.

How to select an O-ring 130x7 NBR

Before ordering, verify:

• inside diameter: 130 mm
• cross-section: 7 mm
• material: NBR
• hardness: 70 ShA
• groove dimensions and geometry
• operating medium
• operating temperature
• pressure
• static or dynamic sealing conditions

Identical 130x7 mm dimensions do not automatically mean that O-rings made from different materials or with different hardness values are interchangeable.

Installation

The groove and mating surfaces should be clean before installation. The O-ring should be installed evenly without twisting, cutting or damaging the elastomer.

Sharp edges, threads and burrs should not come into direct contact with the sealing surface during assembly.

Alternative designations and search references

Natural alternative forms of this specification include:

• O-ring 130x7 NBR 70 ShA
• O-ring NBR 130x7 mm 70 ShA
• O-ring 130x7 NBR 70 Shore A
• NBR O-ring 130x7 mm
• O-ring 130 x 7 NBR

These are alternative written forms of the same basic dimensional and material specification.

FAQ

What are the dimensions of O-ring 130x7 NBR?

The nominal inside diameter is 130 mm and the cross-section is 7 mm.

Does 130 mm refer to the outside diameter?

No. In the 130x7 mm designation, 130 mm is the nominal inside diameter and 7 mm is the cross-section.

What is the outside diameter of a 130x7 O-ring?

Based on nominal geometry, the outside diameter is approximately 144 mm.

What does NBR mean?

NBR stands for nitrile butadiene rubber, an elastomer widely used for technical sealing elements and O-rings.

What does 70 ShA mean?

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

Can an O-ring 130x7 NBR be replaced with an O-ring 130x7 FKM?

Not automatically. Although the nominal dimensions are identical, NBR and FKM have different material properties and chemical resistance. The material must be selected according to the operating medium and conditions.

Are 130x7 NBR 70 ShA and 130x7 NBR 90 ShA the same product?

No. They have the same nominal dimensions and may both be made from NBR, but they have different hardness values. The correct hardness depends on the sealing system and operating conditions.

O-ring 130x7 NBR 70 ShA - key information

O-ring 130x7 NBR 70 ShA is an elastomeric sealing ring with a nominal inside diameter of 130 mm and a 7 mm cross-section. It is made from nitrile butadiene rubber with a hardness of 70 Shore A. Correct selection requires consideration of the medium, temperature, pressure, groove geometry and operating conditions.