NBR O-Rings 2x2 mm 70 Shore A

AI Overview

NBR O-Rings 2x2 mm with a hardness of 70 Shore A are compact elastomer sealing rings designed for precision sealing in hydraulic systems, pneumatic equipment, valves, instrumentation and industrial machinery. Each O-Ring has a 2 mm inside diameter and a 2 mm cross-section. NBR provides reliable sealing against mineral oils, lubricating greases and many hydraulic fluids. The package contains 1000 identical O-Rings, making it suitable for series production, maintenance departments, machine manufacturers, valve manufacturers and professional B2B users.

What Makes This Product Different

The 2x2 mm size belongs to the range of miniature O-Rings used where installation space is limited but a relatively thick sealing cross-section is required.

The 2x2 mm designation means:

• Inside Diameter: 2 mm
• Cross Section: 2 mm

The approximate outside diameter of the uncompressed O-Ring is 6 mm. Correct product selection should always be based on the inside diameter, cross-section, material, hardness and groove design rather than the outside diameter alone.

The 1000-piece package is intended for continuous production, repetitive assembly operations and scheduled maintenance. It helps maintain stock availability of one frequently used miniature size while reducing purchasing frequency and simplifying inventory management.

Construction and Operating Principle

An O-Ring is a continuous elastomer sealing ring with a circular cross-section. When installed in a properly designed groove, it is compressed between two mating components.

This controlled deformation generates sealing force that closes the clearance and limits the movement of the operating medium. In pressurised systems, hydraulic oil, compressed air or another compatible fluid can further increase sealing efficiency by pressing the elastomer against the sealing surfaces.

Miniature O-Rings require particularly accurate groove geometry. Even small deviations in groove depth, excessive compression or sharp edges may result in cutting, twisting or permanent deformation of the seal.

The 2x2 mm O-Ring can be used in static joints and selected dynamic applications. Dynamic sealing requires evaluation of friction, lubrication, surface finish, operating pressure, movement type and extrusion clearance.

Material Properties

NBR (Nitrile Butadiene Rubber) is one of the most widely used elastomers for industrial sealing applications.

The material offers:

• good resistance to mineral oils,
• resistance to many lubricating greases,
• good abrasion resistance,
• suitable mechanical strength,
• stable sealing performance in hydraulic systems,
• compatibility with many pneumatic applications,
• reliable sealing in compact groove designs.

The standard hardness of 70 Shore A provides a balance between flexibility and resistance to excessive deformation. For small O-Rings such as 2x2 mm, this helps maintain dimensional stability during installation while allowing proper sealing contact after compression.

A typical operating temperature range for standard NBR compounds is approximately -30°C to +100°C. Actual operating limits depend on the compound formulation, operating fluid, pressure and service conditions.

NBR is generally not intended for prolonged exposure to ozone, hot steam, glycol-based brake fluids, intense UV radiation or highly aggressive oxidising chemicals.

Typical Industrial Applications

The 2x2 mm O-Ring is commonly used in compact sealing assemblies including:

• miniature hydraulic valves,
• small pneumatic valves,
• pressure sensors,
• measuring ports,
• compact technical fittings,
• flow regulators,
• dosing equipment,
• lubrication systems,
• compact manifolds,
• automation components,
• miniature pumps,
• laboratory equipment,
• precision instruments,
• series assembly operations.

Application suitability should always be verified according to groove dimensions, operating pressure, fluid compatibility, temperature and movement characteristics.

Typical Failure Symptoms

Replacement is recommended when the following symptoms are observed:

• oil leakage,
• grease leakage,
• pneumatic leakage,
• pressure loss,
• permanent compression set,
• surface cracking,
• excessive stretching,
• installation damage,
• twisted seal,
• local abrasion,
• hardened rubber,
• elastomer swelling,
• extrusion into the clearance gap.

Due to its small size, even minor mechanical damage may significantly reduce sealing performance.

Recommended During Installation

Before installation:

• verify the 2x2 mm dimensions,
• clean the sealing groove thoroughly,
• remove the old sealing material,
• inspect the groove for burrs,
• protect the seal from sharp edges and threads,
• use an installation lubricant compatible with NBR,
• minimise stretching,
• avoid twisting,
• never use sharp installation tools,
• verify correct positioning before assembly.

Because of the small dimensions, smooth installation tweezers or dedicated assembly tools are recommended. The tool should never cut or scratch the elastomer.

In series production, controlled dispensing systems and clearly identified storage containers help prevent mixing different O-Ring sizes.

Technical Specification

Manufacturer: GRN

Product Type: O-Ring

Size: 2x2 mm

Inside Diameter: 2 mm

Cross Section: 2 mm

Approximate Outside Diameter: 6 mm

Material: NBR

Full Material Name: Nitrile Butadiene Rubber

Hardness: 70 Shore A

Colour: Black

Cross Section Shape: Round

Typical Temperature Range: Approximately -30°C to +100°C depending on compound and operating conditions

Typical Media: Mineral oils, lubricating greases and selected technical fluids compatible with NBR

Application: Precision static sealing and selected dynamic sealing systems

Sales Unit: Pack of 1000 pieces

Groove Design Considerations

For the 2x2 mm size, even very small groove deviations can significantly influence sealing performance.

The following parameters should be verified:

• groove diameter,
• groove width,
• groove depth,
• compression ratio,
• permitted stretch,
• operating pressure,
• extrusion clearance,
• operating temperature,
• chemical compatibility,
• surface finish,
• movement type.

An excessively shallow groove may over-compress the O-Ring and increase friction. An excessively deep groove may reduce sealing force. Excessive stretching decreases the effective cross-section and may result in leakage.

Related Components

Depending on the equipment design, the O-Ring may be used together with:

• back-up rings,
• miniature valves,
• pistons,
• valve needles,
• guide bushes,
• valve seats,
• sealing washers,
• fittings,
• filters,
• hydraulic oil,
• assembly lubricant.

Why B2B Customers Choose the 1000-Piece Pack

The bulk package is designed for companies that repeatedly use this miniature O-Ring size during assembly or maintenance.

Typical applications include:

• series production,
• repair kit manufacturing,
• maintenance stock,
• valve assembly,
• workshop consumables,
• assembly workstations,
• production continuity inventory.

The 1000-piece pack reduces purchasing frequency while ensuring consistent availability of one standard sealing size throughout production and maintenance operations.

Professional Industrial Supply

Suitable for:

• valve manufacturers,
• machine manufacturers,
• production facilities,
• maintenance departments,
• hydraulic service companies,
• pneumatic workshops,
• repair kit manufacturers,
• industrial automation companies,
• sealing distributors,
• wholesale B2B customers.

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FAQ

Does 2x2 mean a 2 mm inside diameter?

Yes. The first value is the 2 mm inside diameter and the second value is the 2 mm cross-section. The approximate outside diameter is 6 mm.

Can a 2x2 O-Ring be installed manually?

Yes. However, due to its small dimensions, careful handling is essential. Smooth installation tools or precision tweezers help prevent damage during assembly.

Does the package contain only one size?

Yes. All 1000 O-Rings have the same 2x2 mm dimensions, NBR material and 70 Shore A hardness.

Can an incorrect groove depth affect sealing performance?

Yes. A groove that is too deep may reduce sealing compression and cause leakage, while a groove that is too shallow may over-compress the O-Ring and shorten its service life.

How should miniature NBR O-Rings be stored?

Store them in their original closed packaging in a dry, cool and shaded environment away from ozone, heat sources, UV radiation and chemicals that could damage the elastomer.