O-ring 230x5.7 NBR 70 ShoreA

Technical specifications

The nominal outside diameter of 241.4 mm is calculated from the specified dimensions: 230 mm + 2 x 5.7 mm. It is not an independently verified measurement of the finished product.

The manufacturer, dimensional tolerances, operating temperature range, permissible pressure and specific NBR compound formulation have not been established.

What does O-ring 230x5.7 NBR 70 ShA mean?

The designation identifies the principal dimensional and material characteristics of the sealing ring.

• 230 mm - nominal inside diameter of the O-ring.

• 5.7 mm - nominal cross-sectional diameter.

• NBR - nitrile butadiene rubber, an elastomer commonly used in industrial sealing technology.

• 70 ShA - nominal material hardness measured on the Shore A scale.

The designation 230x5.7 refers to the inside diameter and circular cross-sectional diameter. It does not represent the width and height of a rectangular sealing profile.

Construction and NBR 70 ShA material properties

The O-ring 230x5.7 mm features a continuous, one-piece elastomeric construction with a circular cross-section.

Sealing is achieved through controlled compression of the ring between mating surfaces. The compressed elastomer generates contact pressure that helps prevent leakage through the sealing connection.

NBR is widely used in industrial sealing applications because many nitrile rubber compounds provide resistance to mineral oils, lubricating greases and selected mineral oil-based hydraulic fluids.

A nominal hardness of 70 Shore A provides a balance between elastic deformation and mechanical resistance.

Key construction characteristics include:

• Circular cross-section with a nominal diameter of 5.7 mm.

• Large nominal inside diameter of 230 mm.

• Elastic construction designed to conform to a correctly dimensioned sealing groove.

• Potential suitability for static sealing applications.

• Compatibility of many NBR compounds with mineral oils and lubricating greases.

Actual chemical resistance, temperature capability and mechanical performance depend on the specific elastomer formulation and operating conditions.

NBR is not universally resistant to chemicals. It is generally unsuitable for prolonged exposure to ozone, intensive ultraviolet radiation and many polar solvents.

Typical applications

Due to its relatively large diameter, the O-ring 230x5.7 NBR 70 ShA may be used in appropriately designed sealing connections in industrial equipment.

Typical application areas for this type of sealing ring include:

• Static flange connections in industrial installations.

• Equipment covers and mechanical housings.

• Hydraulic component housings.

• Static sealing connections in tanks and technical chambers.

• Industrial equipment using compatible mineral oils and lubricants.

• Large-diameter circular sealing grooves.

These are potential applications based on the general construction and material properties of NBR O-rings. They do not represent verified OEM applications of this specific product.

Dynamic sealing applications require additional assessment of friction, lubrication, movement, wear and installation geometry.

O-ring NBR 70 ShA compared with other sealing materials

Sealing rings manufactured from different materials are not automatically interchangeable, even when their nominal dimensions are identical.

Selection and interchangeability

When selecting the O-ring 230x5.7 NBR 70 ShA, the following parameters should be verified:

• Nominal inside diameter of 230 mm.

• Cross-sectional diameter of 5.7 mm.

• Installation groove dimensions and tolerances.

• Required cross-sectional compression.

• Circumferential stretching or compression after installation.

• Chemical compatibility with the sealed medium.

• Operating pressure and temperature.

• Static or dynamic sealing conditions.

• Material hardness and compound requirements.

For large-diameter O-rings, correct positioning around the entire circumference is particularly important.

Twisting, localized stretching or uncontrolled deformation may adversely affect sealing performance.

O-rings with identical nominal dimensions may differ in dimensional tolerances, rubber compound formulation, compression set and service life.

Matching dimensions alone do not guarantee complete technical interchangeability.

Alternative designations and search references

Common alternative representations of the same nominal dimensions, material and hardness include:

• O-ring 230x5.7 NBR 70 ShA

• O-ring 230x5.7 mm NBR 70

• NBR 70 O-ring 230x5.7 mm

• Nitrile rubber O-ring 230x5.7

• O-ring 230x5.7 70 Shore A

• O-ring 230x5,7 NBR 70

• NBR sealing ring 230x5.7 mm

These are alternative descriptive designations, not verified manufacturer part numbers, OEM references or confirmed cross-reference numbers.

Installation and handling

Before installation, thoroughly clean the sealing groove and mating surfaces. Dirt, particles, burrs and sharp edges may cause localized damage to the elastomer.

When installing a large-diameter O-ring, ensure uniform positioning around the entire circumference.

Avoid twisting the cross-section, excessive stretching and mechanical damage during assembly.

Where permitted by the application, a compatible assembly lubricant may be used to reduce installation friction.

Store sealing rings in a clean, dry environment protected from direct sunlight, ozone, excessive heat and prolonged mechanical deformation.

FAQ - Frequently asked questions

1. What are the dimensions of the O-ring 230x5.7 NBR 70 ShA?

The nominal inside diameter is 230 mm, the cross-sectional diameter is 5.7 mm, and the calculated nominal outside diameter is 241.4 mm.

2. What does NBR 70 ShA mean?

NBR stands for nitrile butadiene rubber. The designation 70 ShA indicates a nominal elastomer hardness of 70 on the Shore A scale.

3. Is the O-ring 230x5.7 suitable for flange sealing?

It may be suitable for appropriately designed flange connections, provided the groove geometry, compression requirements, chemical compatibility and operating conditions are correct.

4. Is NBR 70 ShA resistant to hydraulic oils?

Many NBR compounds offer good resistance to mineral oil-based hydraulic fluids. Compatibility must be verified for the specific fluid formulation and operating temperature.

5. Can the O-ring 230x5.7 NBR be replaced with an FKM O-ring?

Not automatically. Although the nominal dimensions may match, NBR and FKM differ in chemical resistance, mechanical properties and operating characteristics.

6. Can an NBR 70 ShA O-ring be used with water?

Certain NBR compounds can operate in contact with water. For continuous exposure, elevated temperatures or demanding chemical conditions, the properties of the specific rubber compound should be verified.

7. Is 230x5.7 a standardized O-ring size?

The designation identifies the nominal dimensions. Without manufacturer documentation, compliance with a particular dimensional standard or tolerance class cannot be confirmed for this specific product.

8. How should a 230 mm diameter O-ring be installed?

The ring should be positioned uniformly in a clean, correctly dimensioned groove without twisting, excessive stretching or surface damage. The groove must be designed for the 5.7 mm cross-section and the operating requirements of the sealing connection.

O-ring 230x5.7 NBR 70 ShA - key information

The O-ring 230x5.7 NBR 70 ShA is an elastomeric sealing ring with a 230 mm inside diameter and 5.7 mm cross-section. Manufactured from nitrile butadiene rubber with a nominal hardness of 70 Shore A, it is intended for appropriately designed industrial sealing connections. Proper selection requires verification of groove geometry, medium compatibility and operating conditions.

The product is offered through the specialist B2B industrial trading platform simmering.pl, serving industrial companies, technical purchasing departments and maintenance operations, with worldwide shipping from stock in Poland.