MR 126 2RS ZEN 6x12x4 Deep Groove Ball Bearing

MR126-2RS ZEN 6x12x4 mm - Miniature Deep Groove Ball Bearing

MR126-2RS ZEN is a miniature single-row deep groove ball bearing with dimensions of 6x12x4 mm. Manufactured under the ZEN brand, it features a 6 mm bore diameter, a 12 mm outside diameter and a 4 mm width. The bearing is equipped with elastomer seals on both sides, identified by the 2RS suffix. Its compact construction makes it suitable for small rotating mechanisms where installation space is limited and protection against contamination is required.

Technical Specifications - MR126-2RS ZEN

Technical note: The exact dynamic load rating C, static load rating C0, limiting speed, radial internal clearance, cage material, grease specification, precision class and weight must be verified against the manufacturer's documentation for this particular ZEN bearing version.

These parameters should not be assigned solely on the basis of the MR126-2RS designation.

What Does MR126-2RS ZEN Mean?

MR - Miniature Ball Bearing Series

MR is a designation commonly used for miniature deep groove ball bearings with compact dimensions.

Bearings in this category are used in mechanisms where small overall dimensions, limited component weight and support for small-diameter shafts are important.

Their compact construction makes them suitable for applications with restricted radial and axial installation space.

126 - Bearing Size Identification

The number 126 identifies the bearing's dimensional size.

For MR126, the principal dimensions are:

• Bore diameter: 6 mm.

• Outside diameter: 12 mm.

• Width: 4 mm.

The dimensions 6x12x4 mm are essential for identifying this bearing.

The complete designation must also be considered because different closure versions may have different operating characteristics.

2RS - Elastomer Seals on Both Sides

The 2RS suffix indicates elastomer sealing elements on both sides of the bearing.

These seals help:

• Reduce the entry of dust and contaminants.

• Retain lubricant inside the bearing.

• Protect the balls and raceways from contamination.

• Reduce the need for external lubrication arrangements in suitable applications.

The 2RS designation does not mean that the bearing is completely waterproof or resistant to all chemicals.

ZEN - Bearing Brand

ZEN identifies the bearing brand.

When selecting a replacement, the complete designation, dimensions, sealing arrangement and technical requirements must be considered.

Alternative Designations and Search References

The bearing may appear in technical catalogues, distributor listings and purchasing enquiries under the following written variations:

• MR126-2RS ZEN

• MR 126 2RS ZEN

• MR126 2RS ZEN

• ZEN MR126-2RS

• MR1262RS ZEN

• MR126-2RS 6x12x4 mm

• MR 126 2RS 6x12x4

• MR126 sealed miniature ball bearing

• MR126-2RS miniature deep groove ball bearing

• 6x12x4 mm sealed ball bearing

These alternative written forms help identify the product in technical searches and purchasing enquiries.

However, MR126, MR126-ZZ and MR126-2RS must not automatically be considered identical bearing versions.

Construction and Operating Principle of MR126-2RS ZEN

Single-Row Deep Groove Ball Bearing Construction

MR126-2RS uses a single-row deep groove ball bearing design.

The balls operate between the raceways of the inner and outer rings.

During shaft rotation, the rolling elements allow relative movement between the bearing rings while reducing friction compared with sliding contact.

The deep groove construction primarily supports radial loads and can also accommodate appropriate axial loads in both directions.

The actual permissible load depends on the manufacturer's specifications and operating conditions.

Inner Ring - 6 mm Bore

The inner ring has a nominal bore diameter of 6 mm.

The bearing is intended for installation on a shaft with a suitable diameter and tolerance.

The correct shaft fit depends on several factors, including load direction, rotational speed and mounting arrangement.

An excessively tight fit may reduce internal clearance, while an unsuitable loose fit may allow unwanted movement between the shaft and inner ring.

Outer Ring - 12 mm Outside Diameter

The outer ring has a nominal outside diameter of 12 mm.

It is designed to fit into a compatible housing bore.

The housing must provide appropriate support and a suitable mounting fit.

Correct installation helps maintain the bearing's position and operating alignment.

Bearing Width - 4 mm

The bearing has a nominal width of 4 mm.

This compact axial dimension allows installation in mechanisms where available space is limited.

Even a small difference in bearing width may prevent correct assembly in miniature equipment.

For this reason, all three principal dimensions must be verified before selecting a replacement.

Double Elastomer Sealing

Elastomer seals are installed on both sides of the bearing.

Their purpose is to limit the entry of contaminants and help retain lubricant around the rolling elements and raceways.

Compared with metal shields, elastomer seals may provide improved protection against certain contaminants.

However, depending on their construction, contacting seals may generate greater friction than non-contacting metal shields.

Actual performance depends on seal geometry, material and operating conditions.

Load-Carrying Capability of MR126-2RS

Radial Loads

Deep groove ball bearings are primarily designed to support radial loads.

Radial loads act perpendicular to the shaft axis.

In miniature mechanisms, these loads may result from rotating components, belt tension or forces generated during equipment operation.

The permissible radial load must be determined from the manufacturer's technical data.

Axial Loads

The deep groove construction also allows the bearing to support axial loads in both directions.

The permissible axial load depends on the bearing design, radial loading and operating conditions.

Specific axial load values must not be assumed without verified manufacturer data.

Rotational Speed

Miniature deep groove ball bearings can be used in mechanisms operating at relatively high rotational speeds.

However, the maximum permissible speed of MR126-2RS ZEN requires confirmation from the manufacturer's catalogue.

The sealing arrangement, lubricant, temperature and applied loads influence the actual speed limitation.

Operating Temperature

The permissible operating temperature depends on the bearing materials, sealing elements and lubricant.

The exact temperature range for this ZEN version must be confirmed before use in high-temperature or low-temperature environments.

The 2RS suffix alone does not define the operating temperature range.

MR126-2RS ZEN vs Other Bearing Versions

MR126-2RS vs MR126-ZZ

Both versions have the same principal dimensions of 6x12x4 mm when referring to the corresponding dimensional design.

However, their closure arrangements differ.

MR126-2RS uses elastomer sealing elements.

MR126-ZZ uses metal shields.

This difference may affect friction, contamination protection and lubrication conditions.

Neither version should automatically be considered suitable for every application requiring the other.

MR126-2RS vs Open MR126

An open MR126 bearing does not have seals or shields.

It requires suitable protection against contamination and an appropriate lubrication arrangement within the equipment.

The 2RS version provides additional protection for the rolling elements and raceways.

MR126-2RS vs 626-2RS

These designations must not be confused.

Although both bearings have a 6 mm bore, their outside diameters and widths are different.

A 626-2RS bearing is not a dimensionally interchangeable replacement for MR126-2RS.

MR126-2RS ZEN vs MR126-2RS from Other Manufacturers

Bearings with the same designation and principal dimensions may differ in:

• Ring material.

• Cage material.

• Seal construction.

• Radial internal clearance.

• Precision class.

• Lubricant specification.

• Limiting speed.

• Load ratings.

• Operating temperature range.

For demanding applications, the manufacturer's technical specifications should be compared before substitution.

Applications of MR126-2RS ZEN

The MR126-2RS miniature deep groove ball bearing can be used in small rotating mechanisms when the equipment requirements are compatible with the bearing specifications.

Typical applications for bearings of this size and construction include:

• Miniature drive mechanisms.

• Small rollers and guide assemblies.

• Precision mechanical mechanisms.

• Compact electromechanical equipment.

• Hobby and model-making mechanisms.

• Equipment using 6 mm shafts.

• Small rotating assemblies.

• Mechanisms requiring protection against dust and contamination.

These are typical applications based on the bearing's dimensions and construction, not a confirmed list of specific equipment models.

Bearing selection must account for actual load, speed, temperature, mounting and environmental requirements.

Selection and Interchangeability of MR126-2RS ZEN

Before ordering, verify the following:

1. Complete bearing designation MR126-2RS.

2. ZEN brand identification.

3. Shaft diameter of 6 mm.

4. Housing bore diameter of 12 mm.

5. Bearing width of 4 mm.

6. Double elastomer sealing, 2RS.

7. Required radial internal clearance.

8. Required precision class.

9. Radial loading conditions.

10. Axial loading conditions.

11. Rotational speed.

12. Operating temperature.

13. Contamination exposure.

14. Lubrication requirements.

15. Required bearing service life.

Can MR126-2RS Be Replaced by Another Manufacturer's Bearing?

Yes, provided that the replacement meets the required dimensional and technical specifications.

The most important checks include:

• Dimensions of 6x12x4 mm.

• Single-row deep groove construction.

• Seals on both sides.

• Suitable internal clearance.

• Adequate load-carrying capacity.

• Compatibility with operating conditions.

Complete equivalence should not be assumed solely because two bearings share the MR126-2RS designation.

Why Is the Exact Width Important?

MR126-2RS has a nominal width of 4 mm.

In compact mechanisms, the available axial space may be precisely defined by the housing, shaft shoulders or retaining components.

Installing a wider bearing may prevent correct assembly or cause unwanted axial loading.

Installation and Operating Recommendations

Preparation Before Installation

Before mounting, inspect the shaft and housing bore.

The mating surfaces should be clean and free from burrs, corrosion and mechanical damage.

Use mounting fits appropriate for the application.

Correct Application of Mounting Force

When pressing the bearing onto a shaft, apply the installation force directly to the inner ring.

When pressing the bearing into a housing, apply the installation force directly to the outer ring.

Mounting forces must not be transmitted through the balls.

Because the bearing is miniature, particular care should be taken to avoid excessive installation force and ring deformation.

Protection of the Seals

Do not damage or remove the seals during normal installation.

A damaged seal may reduce contamination protection and cause lubricant loss.

Avoid contact with sharp tools and aggressive cleaning chemicals.

Inspection During Operation

During operation, check for:

• Unusual noise.

• Increased vibration.

• Excessive rotational resistance.

• Abnormal temperature rise.

• Wear-related looseness.

• Seal damage.

Any abnormal operating condition should be investigated before continued use.

Storage

Store the bearing in a clean, dry environment, preferably in its original packaging.

Protect it from moisture, contamination and mechanical damage before installation.

Frequently Asked Questions - MR126-2RS ZEN

What Are the Dimensions of MR126-2RS ZEN?

The bearing has a 6 mm bore diameter, a 12 mm outside diameter and a 4 mm width. Its principal dimensions are 6x12x4 mm.

Is MR126-2RS a Deep Groove Ball Bearing?

Yes. It is a miniature single-row deep groove ball bearing.

What Does 2RS Mean?

2RS indicates elastomer seals on both sides of the bearing.

What Shaft Diameter Is MR126-2RS Designed For?

The nominal bore diameter is 6 mm. The bearing is intended for a shaft with a suitable diameter and mounting tolerance.

Are MR126-2RS and MR126-ZZ the Same?

They share the same principal dimensions in corresponding versions, but their closure arrangements differ. MR126-2RS uses elastomer seals, while MR126-ZZ uses metal shields.

Can MR126-2RS Be Replaced by 626-2RS?

No. MR126-2RS measures 6x12x4 mm, while 626-2RS measures 6x19x6 mm.

Does MR126-2RS Require Lubrication?

Bearings with 2RS seals are commonly supplied with grease inside. The exact lubricant specification and maintenance requirements for the ZEN version should be confirmed in the manufacturer's documentation.

Is MR126-2RS Waterproof?

The 2RS seals help limit the entry of moisture and contaminants, but they do not make the bearing completely waterproof.

The bearing must not automatically be considered suitable for immersion in water.

Is MR126-2RS Suitable for High-Speed Operation?

The permissible rotational speed depends on the bearing construction, lubrication, load and operating temperature.

The exact limiting speed must be verified against ZEN technical data.

Can MR126-2RS Support Axial Loads?

Yes. Its deep groove construction can support appropriate axial loads in both directions.

The permissible load depends on the manufacturer's specifications and the operating conditions.

MR126-2RS ZEN - Key Technical Information

MR126-2RS ZEN is a miniature single-row deep groove ball bearing with dimensions of 6x12x4 mm. It features a 6 mm bore, a 12 mm outside diameter and a 4 mm width. Elastomer seals on both sides help protect the balls and raceways from contamination and retain lubricant. Its compact design is suitable for small rotating mechanisms with limited mounting space.

MR126-2RS ZEN at simmering.pl

MR126-2RS ZEN is offered by simmering.pl, a specialist supplier of rolling bearings, deep groove ball bearings and miniature bearings for industrial applications.

We serve equipment manufacturers, industrial maintenance departments, mechanical workshops and B2B purchasing teams.

Our warehouse and order processing operations are located in Lublin, Poland.

We supply customers throughout Europe and offer worldwide shipping.

We also assist customers in identifying bearing designations, dimensions and compatible replacement parts.