O-ring NBR 28x3 70 ShA - 1000 pcs

O-ring NBR 28x3 70 ShA - 1000 pcs

O-ring NBR 28x3 70 ShA - 1000 pcs is a technical sealing ring made of nitrile rubber, with an inside diameter of 28 mm, a cross-section of 3 mm and a hardness of 70 Shore A. The nominal outside diameter is 34 mm. The 1000 pcs variant is intended particularly for regular consumption in manufacturing, assembly, maintenance and technical service operations.

The price is for a package of 1000 pcs.

Technical Specifications - O-ring NBR 28x3 70 ShA

O-ring NBR 28x3 70 ShA - Dimensions

The designation 28x3 defines the two principal dimensions of the sealing ring:

28 mm - inside diameter ID

3 mm - cross-section CS

The nominal outside diameter can be calculated as:

OD = ID + 2 x CS

Therefore:

28 + 2 x 3 = 34 mm

The nominal O-ring dimensions are:

ID 28 mm / CS 3 mm / OD 34 mm

When ordering a batch of 1000 pcs, both the inside diameter and cross-section should be carefully verified. O-rings with a similar outside diameter can have different ID/CS combinations and are not necessarily interchangeable.

NBR 70 ShA - Material Characteristics

The O-ring is manufactured from NBR (Nitrile Butadiene Rubber), commonly known as nitrile rubber.

NBR is one of the most widely used elastomers in sealing technology. It is commonly used in contact with many mineral oils, lubricating greases and compatible technical fluids.

The hardness of 70 ShA provides a practical combination of flexibility and mechanical stability suitable for many standard O-ring sealing arrangements.

Material selection should nevertheless take into account the operating medium, temperature, pressure and design of the sealing system.

O-ring NBR 28x3 70 ShA for Series Production

The 1000 pcs package is particularly suitable when O-ring 28x3 is used as a recurring component in manufacturing or assembly.

A larger quantity of one specification can be useful for:

series production of components

machinery and equipment manufacturing

assembly of technical components

production of repair kits

regular assembly operations

For series production, the 28x3 / NBR / 70 ShA specification should correspond to the technical documentation and design requirements of the manufactured component.

O-ring NBR 28x3 70 ShA for Maintenance

O-rings are common wear and service components used during inspections, repairs and maintenance of industrial equipment.

Where the 28x3 NBR 70 ShA specification is regularly used within a facility, a 1000 pcs package can provide an appropriate working stock for maintenance departments.

This is particularly useful where the same O-ring size is installed in multiple pieces of equipment or replaced regularly during scheduled maintenance.

Typical Applications of NBR O-rings

NBR O-rings as a product group are widely used in:

industrial machinery

hydraulic systems

pneumatic systems

pumps and valves

mechanical assemblies

production equipment

technical installations

maintenance and repair operations

The exact 28x3 size should only be used where it meets the dimensional and operating requirements of the particular sealing arrangement.

The 28x3 size should not be assigned to a specific machine or component without confirmation from technical documentation.

NBR 70 ShA vs NBR 90 ShA

An O-ring with 28x3 dimensions can be manufactured in different hardness grades.

NBR 70 ShA is more flexible.

NBR 90 ShA is harder and less susceptible to deformation.

The 90 ShA version is not automatically a better replacement for the 70 ShA version.

The required hardness depends on factors including pressure, extrusion gap, groove geometry, compression and operating conditions.

When purchasing a larger batch, it is therefore particularly important to verify not only the 28x3 dimensions but also the required 70 ShA hardness.

O-ring NBR 28x3 vs FKM, EPDM and VMQ

The 28x3 size can also be manufactured from other sealing elastomers.

An O-ring made from FKM/FPM, EPDM or VMQ may have identical dimensions but different material properties.

Changing the elastomer can affect:

chemical compatibility

temperature performance

resistance to specific media

mechanical behaviour

Dimensional compatibility alone therefore does not guarantee complete interchangeability.

How to Select O-ring NBR 28x3 70 ShA

Before ordering, verify:

• inside diameter ID = 28 mm
• cross-section CS = 3 mm
• nominal OD = 34 mm
• NBR material
• hardness = 70 ShA
• operating medium
• operating temperature
• pressure
• groove geometry
• required compression
• extrusion gap
• static or dynamic operation

For series production, the technical specification should correspond to the design documentation. For maintenance and repair, the required seal specification should be confirmed for the particular sealing arrangement.

Installation of O-ring NBR 28x3

Before installation, clean the groove and mating surfaces.

The O-ring should be installed without twisting and protected from sharp edges, burrs and unprotected threads.

During installation, avoid:

cutting the elastomer

scratching the O-ring surface

excessive stretching

twisting the O-ring

contaminating the sealing surface

If an assembly lubricant is used, its compatibility with both NBR and the operating medium should be verified.

1000 pcs of O-rings 28x3 - for Regular Consumption

This offer includes 1000 pcs of O-rings NBR 28x3 70 ShA.

This quantity is intended particularly for companies that use the same O-ring specification repeatedly.

It can be suitable for series production, industrial facilities, maintenance departments, technical service companies, workshops and manufacturers assembling technical or repair kits.

For lower consumption, the same specification may also be available in a 100 pcs package.

Storage of Larger Quantities of NBR O-rings

When purchasing 1000 pcs, correct storage of elastomer seals becomes particularly important.

O-rings should be stored under suitable conditions and protected from factors that could adversely affect the elastomer.

They should not be stored under conditions that cause permanent stretching, twisting or deformation.

For technical inventory management, the product can be clearly identified as:

28x3 / NBR / 70 ShA

This helps distinguish it from O-rings with identical dimensions but different materials or hardness grades.

FAQ - O-ring NBR 28x3 70 ShA - 1000 pcs

How many O-rings are included in this offer?

The package contains 1000 pcs of O-rings NBR 28x3 70 ShA.

What are the dimensions of each O-ring?

Each O-ring has an inside diameter of 28 mm and a cross-section of 3 mm. Its nominal outside diameter is 34 mm.

What does NBR 70 ShA mean?

NBR stands for nitrile rubber. 70 ShA specifies the hardness of the elastomer on the Shore A scale.

Is NBR suitable for use with oil?

NBR has good compatibility with many mineral-based oils and lubricating greases. Suitability should always be verified for the specific medium, temperature and operating conditions.

Are 28x3 NBR 70 ShA and 28x3 NBR 90 ShA interchangeable?

Not automatically. They have identical nominal dimensions but different hardness and mechanical behaviour.

Why choose a 1000 pcs package?

The 1000 pcs variant is intended primarily for regular consumption in production, assembly, maintenance and servicing where the same O-ring specification is used repeatedly.

Is a smaller package available?

For lower-volume requirements, the same O-ring specification may also be offered in a 100 pcs package.

O-ring NBR 28x3 70 ShA - 1000 pcs - Key Information

O-ring NBR 28x3 70 ShA - 1000 pcs has an inside diameter of 28 mm, a 3 mm cross-section and a nominal outside diameter of 34 mm. It is manufactured from nitrile rubber with 70 Shore A hardness. The 1000 pcs variant is particularly suitable for series production, maintenance and customers regularly using this O-ring size.

Available from simmering.pl, stock in Poland with worldwide shipping.