O-ring 5x1.6 NBR 90 ShoreA

Technical specifications

The nominal outside diameter of 8.2 mm is calculated from the inside diameter and cross-sectional diameter: 5 mm + 2 x 1.6 mm. It is not an independently verified measurement of the finished product.

What does O-ring 5x1.6 NBR 90 ShA mean?

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

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

• 1.6 mm - nominal cross-sectional diameter.

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

• 90 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 90 ShA material properties

The O-ring 5x1.6 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 within a correctly designed installation groove.

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

A nominal hardness of 90 Shore A indicates a relatively hard elastomer compared with standard NBR 70 ShA sealing rings.

In appropriately designed applications, this higher hardness may provide:

• Greater resistance to deformation under mechanical loading.

• Reduced susceptibility to extrusion into sealing clearances.

• Increased resistance to compression during assembly.

• Lower flexibility when conforming to surface irregularities.

• Greater compression force requirements compared with softer compounds.

A hardness rating of 90 Shore A does not automatically establish a higher permissible operating pressure.

Pressure capability also depends on sealing clearance, groove geometry, operating temperature, material formulation and the overall sealing system design.

O-ring NBR 90 ShA compared with NBR 70 ShA

These comparisons describe the general influence of hardness. Actual performance depends on the specific elastomer compound.

NBR 70 ShA and NBR 90 ShA sealing rings are not automatically interchangeable, even when their dimensions are identical.

Typical applications

O-rings manufactured from NBR with a nominal hardness of 90 Shore A may be used in appropriately designed:

• Static hydraulic sealing connections.

• Valve bodies and hydraulic control assemblies.

• Pneumatic fittings and components.

• Industrial fluid handling equipment.

• Equipment housings and covers.

• Sealing connections requiring a relatively hard elastomer.

These are potential applications based on the material and construction, not verified equipment-specific applications of this particular product.

Dynamic sealing applications require additional evaluation of friction, lubrication, movement, operating speed and wear conditions.

Selection and interchangeability

When selecting the O-ring 5x1.6 NBR 90 ShA, the following parameters should be checked:

• Inside diameter and cross-sectional diameter.

• Installation groove dimensions.

• Required compression and squeeze.

• Extrusion clearance.

• Operating pressure and temperature.

• Chemical compatibility with the sealed medium.

• Static or dynamic sealing conditions.

• Dimensional tolerances and compound properties.

Special attention should be given to the increased hardness of the elastomer.

Installing a 90 ShA O-ring in a groove originally designed for a 70 ShA compound may result in excessive assembly forces or unsuitable sealing conditions.

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 5x1.6 NBR 90 ShA

• O-ring 5x1.6 mm NBR 90

• NBR 90 O-ring 5x1.6 mm

• Nitrile rubber O-ring 5x1.6

• O-ring 5x1.6 90 Shore A

• O-ring 5x1,6 NBR 90

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 sharp edges, burrs, twisting and excessive stretching during assembly.

Because of its nominal hardness of 90 Shore A, the ring may require greater installation force than an equivalent 70 ShA O-ring.

Do not use sharp tools to force the seal into position.

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 5x1.6 NBR 90 ShA?

The nominal inside diameter is 5 mm, the cross-sectional diameter is 1.6 mm, and the calculated nominal outside diameter is 8.2 mm.

2. What does 90 ShA mean?

90 ShA indicates a nominal elastomer hardness of 90 on the Shore A scale. Compared with a similar NBR 70 ShA compound, the material is less susceptible to deformation under equivalent mechanical loading.

3. Is the O-ring NBR 90 ShA suitable for hydraulic applications?

It may be suitable for appropriately designed hydraulic sealing systems, provided the material is compatible with the hydraulic fluid and the operating pressure, temperature and groove geometry are within acceptable limits.

4. Is an NBR 90 ShA O-ring better than an NBR 70 ShA O-ring?

Not in every application. A harder elastomer may improve resistance to extrusion into sealing clearances but requires greater compression force and may be less effective where low contact pressure is available.

5. Can an NBR 70 ShA O-ring be replaced with an NBR 90 ShA version?

Not without checking the sealing design. Changing hardness affects compression behavior, contact force and the interaction between the O-ring and its installation groove.

6. Is NBR 90 ShA resistant to mineral oils?

Many NBR compounds provide good resistance to mineral oils and lubricating greases. Compatibility must be verified for the specific fluid formulation and operating conditions.

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

Each package contains 100 pieces of O-ring 5x1.6 mm manufactured from NBR with a nominal hardness of 90 Shore A.

O-ring 5x1.6 NBR 90 ShA - key information

The O-ring 5x1.6 NBR 90 ShA is an elastomeric sealing ring with a 5 mm inside diameter and 1.6 mm cross-section. Manufactured from nitrile butadiene rubber with a nominal hardness of 90 Shore A, it offers greater resistance to deformation than comparable 70 ShA compounds. Proper groove design and operating conditions are essential. 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.