O-Ring 55x2 VMQ/MVQ 70 Shore A - Silicone Rubber Sealing Ring

O-Ring 55x2 mm VMQ/MVQ 70 Shore A - Silicone Rubber Sealing Ring (Pack of 100)

O-Ring 55x2 mm VMQ/MVQ 70 Shore A is a silicone rubber sealing ring with a nominal inside diameter of 55 mm, a cross-sectional diameter of 2 mm and a nominal outside diameter of 59 mm. Manufactured from VMQ/MVQ silicone elastomer with a nominal hardness of 70 Shore A, this O-ring is primarily intended for static sealing applications in industrial equipment and mechanical assemblies. The product is supplied in a pack of 100 pieces, making it suitable for maintenance, technical procurement and repeated assembly operations.

Technical Specifications - O-Ring 55x2 VMQ/MVQ 70 Shore A

The nominal outside diameter is calculated as follows:

59 mm = 55 mm + 2 x 2 mm

This is the geometric outside diameter of the undeformed O-ring and does not include manufacturing tolerances.

Exact dimensional tolerances, operating temperature limits, chemical resistance, mechanical properties, compression set and permissible operating pressure must be verified against the technical documentation for the specific silicone compound.

What Does O-Ring 55x2 VMQ/MVQ 70 Shore A Mean?

The product designation identifies its main technical characteristics:

• 55 - nominal inside diameter of 55 mm.

• 2 - nominal cross-sectional diameter of 2 mm.

• VMQ - standardized designation for silicone rubber.

• MVQ - alternative designation encountered in commercial silicone sealing terminology.

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

• 100 pcs - the package contains 100 individual O-rings.

The designation 55x2 mm refers to the inside diameter and cross-sectional diameter, not the inside and outside diameters.

VMQ vs MVQ - Silicone Rubber Material Designations

VMQ is the standardized designation for silicone rubber used in industrial elastomeric sealing products.

MVQ is an alternative designation encountered in technical catalogs and commercial product descriptions.

Both terms refer to the silicone rubber material family but do not identify the complete compound formulation.

Different VMQ compounds may vary in:

• Tensile strength.

• Tear resistance.

• Compression set.

• Chemical compatibility.

• Operating temperature limits.

• Aging resistance.

• Material approvals and certifications.

Matching dimensions, VMQ material designation and 70 Shore A hardness do not automatically guarantee complete interchangeability.

Construction and Operating Principle

The 55x2 mm VMQ/MVQ silicone O-ring is a one-piece elastomeric sealing element with a circular cross-section.

It contains no metal reinforcement, spring or additional sealing lip.

When installed in a correctly designed groove, the O-ring is compressed between two mating surfaces.

The resulting elastic deformation generates contact pressure that helps prevent liquids or gases from passing through the sealing interface.

Effective sealing depends on:

• Correct groove geometry.

• Appropriate cross-sectional compression.

• Groove fill.

• Surface finish of mating components.

• Operating pressure.

• Temperature.

• Chemical compatibility.

• Compression set.

• Extrusion gap dimensions.

• Static or dynamic operating conditions.

Importance of the 2 mm Cross-Section at a 55 mm Inside Diameter

The 55x2 mm O-ring combines a relatively large inside diameter with a comparatively small cross-section.

This geometry requires attention during installation.

The O-ring may be susceptible to:

• Twisting during placement in the groove.

• Uneven stretching.

• Accidental pinching between components.

• Damage from sharp edges.

• Incorrect positioning inside the groove.

Correct groove design and careful installation are important for reliable sealing.

An O-ring measuring 55x2 mm is not automatically interchangeable with a 55x1.5 mm or 55x2.5 mm O-ring.

Silicone Rubber VMQ 70 Shore A - Material Properties

Flexibility Across a Broad Temperature Range

VMQ silicone rubber is commonly used in sealing applications requiring flexibility at low temperatures and resistance to elevated temperatures.

Compared with many conventional rubber compounds, silicone elastomers can offer favorable temperature-related properties.

However, the exact permissible operating temperature range depends on:

• Silicone compound formulation.

• Duration of temperature exposure.

• Sealed medium.

• Mechanical loading.

• Compression level.

• Environmental conditions.

Specific minimum and maximum operating temperatures should not be assigned without verified material documentation.

Hardness of 70 Shore A

A nominal hardness of 70 Shore A describes the elastomer's resistance to indentation.

Hardness influences:

• Deformation during installation.

• Contact pressure.

• Required compression.

• Resistance to extrusion.

• Mechanical behavior under load.

A hardness value of 70 Shore A does not independently determine maximum permissible operating pressure.

Pressure capability depends on groove design, extrusion gap, temperature, compound properties and the complete sealing arrangement.

Chemical Compatibility

VMQ silicone rubber is not universally resistant to all chemicals.

Before installation, compatibility should be checked for:

• Mineral oils.

• Fuels.

• Solvents.

• Industrial chemicals.

• Cleaning agents.

• Process fluids.

• Gases.

Chemical resistance also depends on temperature, concentration and exposure duration.

The suitability of the specific silicone compound must be confirmed for the intended medium.

Mechanical Resistance

Silicone rubber may exhibit lower resistance to tearing and abrasion than elastomers specifically selected for intensive dynamic sealing.

For an O-ring with a 55 mm inside diameter and 2 mm cross-section, avoiding excessive stretching, twisting and contact with sharp edges is particularly important.

VMQ vs NBR, FKM and EPDM O-Rings

These materials may all be available as O-rings with identical dimensions of 55x2 mm and nominal hardness of 70 Shore A.

However, they are not automatically interchangeable.

The correct elastomer must be selected according to the sealed medium, temperature, pressure, mechanical requirements and operating conditions.

Alternative Designations and Search References

The product may appear under the following commercial designations:

• O-Ring 55x2 VMQ 70 Shore A

• O-Ring 55x2 MVQ 70 Shore A

• Silicone O-Ring 55x2 mm

• VMQ O-Ring 55x2 mm

• MVQ Silicone O-Ring 55x2

• O-Ring 55x2 70 ShA Silicone

• Silicone Rubber O-Ring 55x2 mm

• Silicone Sealing Ring 55x2 mm

• O-Ring 55 mm ID x 2 mm CS

• Silicone O-Ring 55x2 mm - 100 pcs

• Silicone Rubber O-Ring 55x2 mm - Pack of 100

These are alternative commercial descriptions of the same nominal dimensions and material category.

They are not verified OEM part numbers or manufacturer-specific cross-references.

Selecting the Correct 55x2 mm Silicone O-Ring

Before ordering, verify the following parameters:

• Inside diameter: 55 mm.

• Cross-sectional diameter: 2 mm.

• Nominal outside diameter: 59 mm.

• Material: VMQ / MVQ silicone rubber.

• Nominal hardness: 70 Shore A.

• Groove dimensions and tolerances.

• Required cross-sectional compression.

• Installation stretch.

• Groove fill.

• Operating pressure.

• Operating temperature.

• Chemical compatibility.

• Static or dynamic sealing conditions.

• Surface finish.

• Extrusion gap.

• Required service life.

How Should the Groove Be Designed?

The groove must provide sufficient compression to create an effective seal while allowing space for elastomer deformation.

The groove depth should not simply be assumed to equal the 2 mm cross-sectional diameter.

Insufficient compression may cause leakage, while excessive compression may damage the elastomer or accelerate permanent deformation.

Groove dimensions should be selected according to the sealing arrangement and applicable engineering design guidelines.

Can a 55x2 mm O-Ring Be Replaced with a 55x2.5 mm O-Ring?

Not automatically.

The difference in cross-sectional diameter is 0.5 mm.

This may significantly affect compression, groove fill and correct installation.

Interchangeability requires verification of the groove geometry and operating conditions.

Pack of 100 - Industrial Supply and Maintenance Applications

The product is supplied in a package containing 100 silicone O-rings, each with nominal dimensions of 55x2 mm.

Bulk packaging is particularly useful for:

• Industrial maintenance departments.

• Mechanical workshops.

• Equipment repair services.

• Manufacturing facilities.

• Technical procurement departments.

• Companies assembling sealing kits.

• Businesses requiring repeated replacement of identical sealing components.

A pack of 100 provides a convenient sales quantity for maintenance inventories, production planning and technical purchasing.

It can help businesses organize spare parts and plan repeated assembly or servicing operations.

Typical Applications of Silicone O-Rings 55x2 mm

Silicone O-rings with a 55 mm inside diameter and 2 mm cross-section may be used in correctly designed sealing arrangements where the material and geometry are compatible with operating conditions.

Typical applications of this sealing design include:

• Static joints in industrial equipment.

• Covers and housings.

• Technical and mechanical assemblies.

• Connections requiring elastomeric sealing rings.

• Mechanical components with correctly designed O-ring grooves.

• Static sealing arrangements involving compatible liquids or gases.

These are general applications of silicone O-ring technology, not verified OEM applications for this specific product.

Food, Medical and Drinking Water Applications

Silicone rubber is used in certain food-contact, medical and drinking-water applications.

However, the VMQ material designation alone does not establish regulatory compliance.

Suitability for these applications requires appropriate documentation for the specific silicone compound and finished product.

A generic silicone O-ring should not be described as food-grade, medical-grade or drinking-water approved without verified certification.

Installation and Maintenance

Preparing the Sealing Surfaces

Before installation, clean the groove and mating surfaces.

Remove dirt, burrs and sharp edges that could damage the silicone elastomer.

Inspect the groove for scratches, corrosion and dimensional defects.

Installing the O-Ring

During installation:

• Position the O-ring evenly inside the groove.

• Avoid twisting the elastomer.

• Do not stretch the ring more than necessary.

• Avoid sharp installation tools.

• Use only assembly lubricants compatible with silicone and the sealed medium.

• Check that the O-ring is not trapped or pinched between mating components.

For a 55 mm inside diameter and 2 mm cross-section, carefully inspect the entire circumference to ensure the ring is positioned evenly without twisting.

Inspection During Service

Inspect the sealing arrangement during scheduled maintenance.

Replace the O-ring if it shows cracking, tearing, permanent flattening, excessive swelling or loss of elasticity.

Storage

Store silicone O-rings in a clean, dry environment.

Protect them against contamination, mechanical damage, excessive stretching and permanent compression.

Frequently Asked Questions - O-Ring 55x2 VMQ/MVQ 70 Shore A

1. What are the dimensions of the 55x2 mm silicone O-ring?

The O-ring has a nominal inside diameter of 55 mm, cross-sectional diameter of 2 mm and outside diameter of 59 mm.

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

Each sales package contains 100 silicone O-rings with nominal dimensions of 55x2 mm.

3. What does VMQ or MVQ mean?

VMQ is the standardized designation for silicone rubber. MVQ is an alternative designation encountered in industrial sealing terminology.

4. What does 70 Shore A mean?

70 Shore A indicates the nominal hardness of the silicone elastomer. It influences deformation, contact pressure and sealing behavior.

5. Is the 55x2 mm silicone O-ring resistant to high temperatures?

VMQ silicone rubber is commonly used in applications requiring flexibility across a broad temperature range. Exact operating temperature limits depend on the specific compound.

6. Can a 55x2 mm VMQ O-ring replace an NBR O-ring?

Not automatically. VMQ and NBR differ in chemical, thermal and mechanical properties. Material compatibility must be verified before substitution.

7. Is a 55x2 mm O-ring interchangeable with a 55x2.5 mm O-ring?

Not automatically. The difference in cross-sectional diameter affects groove fit and compression. Interchangeability requires technical verification.

8. Is this silicone O-ring suitable for food contact?

Not without appropriate documentation. Food-contact suitability requires verification of the specific silicone compound and finished product.

O-Ring 55x2 VMQ/MVQ 70 Shore A - Key Product Information

The 55x2 mm VMQ/MVQ 70 Shore A O-ring is a silicone rubber sealing ring with a 55 mm inside diameter, 2 mm circular cross-section and 59 mm nominal outside diameter. Its hardness is 70 Shore A. Supplied in a pack of 100 pieces, it is primarily intended for compatible static sealing applications requiring correct groove design and material selection.

The 55x2 mm VMQ/MVQ 70 Shore A silicone O-ring, pack of 100, is offered by simmering.pl, an industrial sealing components and bearing supplier operated by TG Ersatzteile Polska Sp. z o.o. The company maintains a warehouse in Lublin, Poland, serving industrial customers, maintenance departments and technical procurement teams with shipping across Europe and worldwide.