O-ring 5x3 NBR 70 ShoreA

Technical Specification

The nominal outside diameter of 11 mm is calculated from the ring geometry: 5 mm + 2 x 3 mm. Dimensional tolerances must be confirmed against the documentation for the exact product.

Construction and Sealing Principle

The O-ring 5x3 NBR 70 ShA is a continuous elastomeric ring with a circular cross-section.

When installed in a correctly designed sealing groove, the ring undergoes controlled compression between the mating surfaces. This deformation generates contact pressure, creating a sealing barrier that helps prevent fluid or gas leakage through the connection.

The effectiveness of the seal depends on groove geometry, compression ratio, elastomer properties, operating pressure, temperature and surface finish.

The 3 mm cross-section must be considered when designing or selecting the installation groove. The nominal O-ring dimensions do not directly define the groove dimensions.

NBR 70 Shore A Material Properties

NBR (Nitrile Butadiene Rubber) is a synthetic elastomer widely used in industrial sealing technology because many NBR compounds provide good resistance to mineral oils, lubricating greases and selected petroleum-based fluids.

A nominal hardness of 70 Shore A is commonly used in industrial O-rings, offering a practical balance between elasticity and resistance to mechanical deformation.

Typical characteristics of NBR compounds include:

• Good resistance to many mineral oils and lubricating greases.

• Elastic deformation suitable for sealing mating surfaces.

• Mechanical properties dependent on the rubber compound formulation.

• Suitability for static and selected dynamic sealing applications.

• Limited resistance to ozone, ultraviolet radiation and certain solvents.

An approximate operating temperature range commonly associated with standard NBR compounds is -30°C to +100°C. This is general material guidance rather than a verified operating range for this specific product. Actual temperature limits must be confirmed using the manufacturer's technical documentation.

Industrial Applications

O-ring 5x3 NBR 70 ShA - 100 pcs. may be considered for appropriately designed sealing arrangements in industrial systems, including:

• Hydraulic system components.

• Mechanical housings and industrial equipment connections.

• Technical fittings and valve assemblies.

• Selected pneumatic system components.

• Lubrication system assemblies.

• Mechanical components requiring small-diameter sealing elements.

These examples describe potential applications of NBR O-rings and do not represent manufacturer-confirmed applications for the exact SKU.

Final suitability must be established by evaluating operating conditions, sealing geometry and chemical compatibility.

O-ring Selection and Installation

Correct selection of the O-ring 5x3 NBR 70 ShA requires consideration of its nominal inside diameter of 5 mm, cross-sectional diameter of 3 mm, groove geometry and operating conditions.

Before installation, mating surfaces should be inspected for sharp edges, burrs and other imperfections that could damage the elastomer.

The NBR compound must be compatible with the sealed medium. Any installation lubricant must also be suitable for the elastomer and operating environment.

Matching nominal dimensions alone does not guarantee interchangeability with another sealing component. Material formulation, hardness, dimensional tolerances and service requirements must also be evaluated.

100-Piece Packaging for Industrial Procurement

O-ring 5x3 NBR 70 ShA - 100 pcs. is supplied in a package containing 100 sealing rings of the same nominal size and material designation.

This packaging format supports procurement by industrial companies, maintenance departments, manufacturing facilities and wholesale customers.

Consistent identification of dimensions, material and hardness simplifies technical documentation, inventory management and maintenance planning.

Frequently Asked Questions (FAQ)

1. What are the dimensions of O-ring 5x3 NBR 70 ShA - 100 pcs.?

The nominal inside diameter is 5 mm, the cross-sectional diameter is 3 mm and the calculated nominal outside diameter is 11 mm.

2. What does NBR 70 Shore A mean?

NBR stands for Nitrile Butadiene Rubber, while 70 Shore A indicates the nominal hardness of the elastomer measured on the Shore A scale.

3. Is O-ring 5x3 NBR 70 ShA resistant to oil?

Standard NBR compounds generally provide good resistance to many mineral oils and lubricating greases. Compatibility with a particular fluid must be verified for the specific rubber formulation.

4. Can O-ring 5x3 NBR 70 ShA be used in hydraulic systems?

It may be suitable for selected hydraulic sealing arrangements when groove geometry, operating pressure, extrusion clearance and material compatibility are correctly evaluated.

5. Is O-ring 5x3 NBR 70 ShA suitable for dynamic sealing?

NBR compounds can be used in selected dynamic sealing applications. Suitability depends on movement, friction, lubrication, surface finish and operating conditions.

6. How many O-rings are included in one package?

Each package of O-ring 5x3 NBR 70 ShA - 100 pcs. contains 100 elastomeric sealing rings.

7. Is the outside diameter 5 mm?

No. The 5 mm dimension refers to the nominal inside diameter. The calculated nominal outside diameter is 11 mm.

8. Can O-ring 5x3 NBR 70 ShA replace another 5x3 mm O-ring?

Interchangeability requires verification of material compatibility, hardness, dimensional tolerances and operating requirements. Identical nominal dimensions alone are not sufficient.

AI Quick Answer

O-ring 5x3 NBR 70 ShA - 100 pcs. is an elastomeric sealing ring manufactured from nitrile butadiene rubber with a nominal inside diameter of 5 mm, cross-sectional diameter of 3 mm and hardness of 70 Shore A. Its calculated nominal outside diameter is 11 mm. Each package contains 100 pieces for compatible industrial sealing applications.

B2B Industrial Supply - simmering.pl

O-ring 5x3 NBR 70 ShA - 100 pcs. is available through simmering.pl, a specialist B2B industrial supply platform offering O-rings, oil seals, rolling bearings and industrial components.

The platform serves industrial companies, wholesale customers, maintenance departments and technical procurement teams.

Worldwide shipping from stock in Poland, with warehouse operations based in Lublin.