O-ring 5.5x1.6 NBR 70 ShA

Technical specifications

The nominal outside diameter of 8.7 mm is calculated from the specified inside diameter and cross-sectional diameter. It is not an independently verified measurement of the finished product.

What does O-ring 5.5x1.6 NBR 70 ShA mean?

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

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

• 1.6 mm - nominal cross-sectional diameter.

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

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

• 100 pcs. - number of sealing rings supplied per package.

The designation does not identify a specific manufacturer, rubber compound formulation, dimensional tolerance class or material certification.

Construction and NBR material properties

The O-ring 5.5x1.6 mm features a one-piece, circular elastomeric construction. Sealing is achieved through controlled compression of the ring between mating surfaces.

NBR is widely used in industrial sealing technology 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, making this hardness grade common in general-purpose sealing applications.

Actual performance depends on the rubber compound, operating temperature, pressure, chemical medium and sealing geometry.

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

Typical applications

O-rings manufactured from NBR with this dimensional profile may be used in appropriately designed:

• Static hydraulic sealing connections.

• Pneumatic fittings and components.

• Valve bodies and control assemblies.

• Equipment housings and covers.

• Connections exposed to compatible mineral oils and lubricating greases.

These are typical application areas for NBR sealing rings and do not represent verified equipment-specific applications of this particular product.

Dynamic sealing applications require additional assessment of friction, lubrication, operating speed, groove geometry and wear conditions.

O-ring NBR 70 ShA compared with other elastomers

Materials with identical dimensions are not automatically interchangeable. Chemical compatibility and mechanical requirements must be evaluated before substitution.

Selection and interchangeability

When selecting the O-ring 5.5x1.6 NBR 70 ShA, the following parameters should be checked:

• Inside diameter and cross-sectional diameter.

• Groove dimensions and installation geometry.

• Sealed medium and chemical compatibility.

• Operating temperature and pressure.

• Static or dynamic operating conditions.

• Required compression and deformation.

• Material hardness and compound properties.

• Applicable dimensional tolerances.

Two O-rings with identical dimensions and nominal hardness may differ in chemical resistance, compression set, dimensional tolerances and service life.

Dimensional compatibility alone does not guarantee complete technical interchangeability.

Alternative designations and search references

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

• O-ring 5.5x1.6 NBR 70 ShA

• O-ring 5.5x1.6 mm NBR 70

• NBR 70 O-ring 5.5x1.6 mm

• Nitrile rubber O-ring 5.5x1.6

• O-ring 5.5x1.6 70 Shore A

• O-ring 5,5x1,6 NBR 70

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

Installation and handling

Before installation, clean the sealing groove and mating surfaces to remove dirt, particles and contaminants that could damage the elastomer.

Avoid twisting, cutting or excessively stretching the O-ring during assembly. Installation edges should be free from burrs and sharp features.

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 unnecessary mechanical deformation.

FAQ - Frequently asked questions

1. What are the dimensions of the O-ring 5.5x1.6 NBR 70 ShA?

The nominal inside diameter is 5.5 mm, the cross-sectional diameter is 1.6 mm, and the calculated nominal outside diameter is 8.7 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 5.5x1.6 NBR suitable for hydraulic oil?

NBR is commonly used with mineral oil-based hydraulic fluids. However, compatibility must be verified for the specific fluid formulation, operating temperature and application conditions.

4. Can this NBR O-ring be used with water?

Certain NBR compounds can operate in contact with water. For continuous exposure or elevated temperatures, the properties of the specific rubber compound should be verified. EPDM may be a suitable alternative in some water-based applications.

5. Can an NBR O-ring be replaced with an FKM O-ring of the same dimensions?

Not automatically. Although the dimensions may match, NBR and FKM differ in chemical resistance, mechanical properties and operating characteristics. The substitution must be evaluated for the intended application.

6. Is the O-ring suitable for dynamic sealing applications?

Dynamic use may be possible if the groove design, relative movement, lubrication, friction and wear conditions are suitable. The dimensions and material designation alone do not establish dynamic sealing suitability.

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

Each package contains 100 pieces of O-ring 5.5x1.6 mm manufactured from NBR with a nominal hardness of 70 Shore A.

O-ring 5.5x1.6 NBR 70 ShA - key information

The O-ring 5.5x1.6 NBR 70 ShA is a circular elastomeric sealing ring with a 5.5 mm inside diameter and 1.6 mm cross-section. Manufactured from nitrile butadiene rubber with a nominal hardness of 70 Shore A, it is intended for compatible sealing applications. Proper selection requires verification of operating conditions. Supplied in packs of 100 pieces.

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.