O-ring NBR 4.5x1 mm 70 Shore A

O-ring NBR 4.5x1 mm 70 Shore A - 100 pcs B2B Pack

O-ring NBR 4.5x1 mm 70 Shore A is an elastomeric sealing ring with a circular cross-section, manufactured from nitrile butadiene rubber (NBR) with a nominal hardness of 70 Shore A. The nominal inside diameter is 4.5 mm, the cross-section diameter is 1 mm, and the calculated outside diameter is 6.5 mm. This O-ring is intended for appropriately designed technical sealing applications. The B2B sales unit is one pack containing 100 identical O-rings.

Technical Specifications - O-ring NBR 4.5x1 mm 70 Shore A

All dimensions are nominal. Manufacturing tolerances, dimensional accuracy classification and compliance with a specific standard must be confirmed for the supplied product batch.

What Does O-ring 4.5x1 NBR 70 Shore A Mean?

The designation identifies four important technical characteristics.

4.5 mm - Inside Diameter

The first dimension specifies the nominal inside diameter of the O-ring in its free, uninstalled condition.

It does not describe the diameter after stretching during installation.

1 mm - Cross-Section Diameter

The second dimension specifies the nominal diameter of the circular elastomer cross-section.

This dimension is essential when determining the correct groove geometry and sealing compression.

NBR - Sealing Material

NBR stands for nitrile butadiene rubber, an elastomer widely used in sealing systems involving compatible oils, lubricating greases and other industrial fluids.

70 Shore A - Material Hardness

70 Shore A specifies the nominal elastomer hardness.

It does not define dimensional tolerances, maximum working pressure or the permissible operating temperature.

O-ring 4.5x1 mm - Inside and Outside Diameters

O-ring dimensions are conventionally expressed as the nominal inside diameter followed by the cross-section diameter.

For this product:

• Inside diameter: 4.5 mm.

• Cross-section diameter: 1 mm.

• Calculated outside diameter: 6.5 mm.

The nominal outside diameter is calculated as follows:

Outside diameter = 4.5 + 2(1) = 6.5 mm

The 6.5 mm value is a geometric calculation based on nominal dimensions, not a separate measurement of the manufactured O-ring.

Actual dimensions may vary within the applicable manufacturing tolerances.

When designing a sealing groove, engineers must also consider installation stretch, compression and possible deformation.

NBR 70 Shore A - Material Properties

NBR, or nitrile butadiene rubber, is one of the most widely used elastomers in industrial sealing technology.

Depending on the specific rubber compound, NBR generally offers good resistance to many:

• Mineral-based oils.

• Industrial lubricating greases.

• Mineral oil-based hydraulic fluids.

• Compatible industrial operating media.

NBR is not universally resistant to all chemicals.

Compatibility must be evaluated carefully when the seal is exposed to solvents, oxidizing substances, incompatible hydraulic fluids or other aggressive media.

The material designation NBR 70 Shore A alone does not establish a precise operating temperature range, maximum pressure rating or chemical resistance for a particular compound.

What Does 70 Shore A Hardness Mean?

70 Shore A indicates the nominal hardness of the elastomer measured on the Shore A scale.

Hardness influences how the O-ring behaves under compression and how it conforms to the sealing surfaces.

Selection of the appropriate hardness depends on:

• Operating pressure.

• Extrusion gap.

• Groove dimensions.

• Required compression.

• Working temperature.

• Fluid compatibility.

• Static or dynamic sealing conditions.

An O-ring with 70 Shore A hardness is not automatically interchangeable with a 90 Shore A O-ring, even when both have identical nominal dimensions.

Construction and Sealing Principle

The 4.5x1 mm O-ring is a continuous elastomeric ring with a circular cross-section.

Its sealing function is achieved by controlled deformation between mating surfaces.

For this product, the relatively small 1 mm cross-section makes several design factors particularly important:

• Correct groove dimensions.

• Appropriate compression.

• Suitable surface finish.

• Protection against sharp installation edges.

• Prevention of twisting during installation.

• Correct fit between mating components.

The O-ring can be considered for static sealing applications and, where the system is specifically designed for it, certain dynamic sealing arrangements.

Suitability depends on the complete sealing system rather than the O-ring dimensions alone.

Applications of O-ring NBR 4.5x1 mm 70 Shore A

An O-ring with a 4.5 mm inside diameter and 1 mm cross-section may be used in compact sealing arrangements where the groove dimensions and operating conditions are compatible.

Typical application categories include:

• Small industrial connectors and fittings.

• Selected valve assemblies.

• Compact mechanical housings.

• Small sealing interfaces in technical equipment.

• Compatible mineral oil-based hydraulic systems.

• Mechanical components requiring a small elastomeric sealing cross-section.

These are potential applications based on the O-ring's construction and material.

They do not establish compatibility with a particular valve, pump, machine model or OEM part number.

For replacement applications, always verify the original seal dimensions, groove geometry and equipment manufacturer's specifications.

O-ring NBR 4.5x1 mm 70 Shore A vs Other Material Variants

These variants illustrate material and hardness differences. They are not a list of confirmed commercial replacements.

Changing the elastomer or hardness requires verification of the operating conditions.

B2B Packaging - 100 O-rings per Pack

This product is sold in packs of 100 O-rings, all with the same nominal dimensions and material specification.

The 100-piece pack format is suitable for industrial purchasing, maintenance departments, technical workshops and spare parts inventory management.

Pricing and order quantities should be interpreted according to the sales unit displayed on the product page.

Alternative Designations and References

The same nominal dimensions and material specification may be described as:

• O-ring 4.5x1 NBR 70 Shore A

• NBR O-ring 4.5x1 mm

• O-ring NBR 4.5x1 70 ShA

• Nitrile O-ring 4.5x1 mm

• Rubber sealing ring 4.5x1 NBR

• O-ring 4.5x1 NBR 70 - 100 pcs

• Metric O-ring 4.5 mm ID x 1 mm CS

These are alternative descriptions of the dimensions and material specification, not verified OEM numbers or manufacturer-specific part numbers.

How to Select the Correct O-ring

Before ordering, verify:

1. Nominal inside diameter of 4.5 mm.

2. Cross-section diameter of 1 mm.

3. NBR material.

4. Nominal hardness of 70 Shore A.

5. Compatibility with the operating medium.

6. Groove dimensions and geometry.

7. Required sealing compression.

8. Operating temperature and pressure.

9. Static or dynamic application.

10. Required purchasing quantity of 100 pcs per pack.

Do not select an O-ring solely by its outside diameter.

Two O-rings with similar outside diameters may have different inside diameters and cross-sections, resulting in different installation and sealing behavior.

Installation and Storage

Before installation, clean the sealing surfaces and inspect the groove for burrs, sharp edges or contamination.

During installation:

• Avoid sharp tools that could cut the elastomer.

• Do not stretch the O-ring excessively.

• Prevent twisting inside the groove.

• Use only installation lubricants compatible with NBR and the operating medium.

• Confirm correct positioning before assembling the mating components.

Store O-rings in a clean, dry environment away from direct sunlight, ozone sources and excessive heat.

Frequently Asked Questions

What are the dimensions of the O-ring 4.5x1 NBR 70 Shore A?

The nominal inside diameter is 4.5 mm, and the cross-section diameter is 1 mm. The calculated outside diameter is 6.5 mm.

How many O-rings are included in one pack?

One B2B pack contains 100 O-rings.

Is the product sold individually or in packs of 100?

The product is offered as a 100-piece B2B pack. Check the displayed sales unit when reviewing the product price.

What does NBR 70 Shore A mean?

NBR identifies nitrile butadiene rubber. The 70 Shore A designation specifies the nominal hardness of the elastomer.

Is this O-ring suitable for hydraulic oil?

NBR is commonly used with many mineral oil-based hydraulic fluids. Compatibility must still be confirmed for the specific fluid formulation, additives and operating conditions.

Can an FPM O-ring replace an NBR O-ring of the same dimensions?

Not automatically. FPM has different material properties. Interchangeability requires verification of chemical compatibility, temperature conditions, hardness and sealing requirements.

Can a 90 Shore A O-ring replace a 70 Shore A O-ring?

Not necessarily. Increased hardness changes the compression behavior and may affect sealing performance. The groove design and operating conditions must be evaluated.

Will a 4.5x1 mm O-ring fit any groove that is 1 mm wide?

No. Groove width is not automatically equal to the O-ring cross-section diameter. Correct groove dimensions depend on the sealing arrangement and required compression.

O-ring NBR 4.5x1 mm 70 Shore A - Quick Technical Answer

The O-ring NBR 4.5x1 mm 70 Shore A is a nitrile rubber sealing ring with a 4.5 mm nominal inside diameter, 1 mm cross-section and 6.5 mm calculated outside diameter. Its nominal hardness is 70 Shore A. It is supplied in B2B packs of 100 pieces for appropriately designed industrial sealing applications.

NBR O-rings at simmering.pl

simmering.pl supplies NBR O-rings in B2B packaging for industrial companies, technical service providers, maintenance departments and professional purchasing teams.

The product range includes sealing rings in different diameters, cross-sections, materials and hardness grades for industrial sealing applications.

Our warehouse is located in Lublin, Poland. We ship orders throughout Poland, the European Union and to international customers.