EX 212 G2 SNR 60x110x77,7 Insert Ball Bearing

SNR EX212G2 60x110x77.7 mm - Self-Aligning Insert Ball Bearing with Eccentric Locking Collar

SNR EX212G2 is a self-aligning insert ball bearing manufactured by NTN-SNR, with a 60 mm bore diameter, 110 mm outside diameter and 77.7 mm overall width including the eccentric locking collar. It features a spherical outer ring surface, double-sided sealing and an eccentric locking mechanism for shaft attachment. The bearing is designed for installation in compatible bearing housings and accommodates limited initial shaft-to-housing misalignment.

Technical Specifications - SNR EX212G2

The overall width of 77.7 mm includes the eccentric locking collar. It must not be confused with the 61.8 mm inner ring width or the 27 mm outer ring width.

These dimensions are important when evaluating installation space and replacement compatibility.

Additional Dimensions and Mounting Specifications

The mounting dimensions and locking arrangement must be checked against the actual shaft and housing design.

What Does SNR EX212G2 Mean?

The designation identifies the insert bearing series, nominal bore size and construction execution.

EX - Eccentric Locking Collar Bearing Series

The EX series identifies SNR insert bearings with an extended inner ring and eccentric locking collar.

The eccentric locking mechanism secures the bearing to the shaft through a mechanical wedging action between the locking collar and the eccentric section of the inner ring.

This arrangement differs from insert bearings that use two set screws acting directly on the shaft.

212 - Bearing Size

The size code 212 identifies an insert bearing with a nominal bore diameter of 60 mm and an outside diameter of 110 mm.

These dimensions are important for shaft compatibility and the spherical seating arrangement inside the bearing housing.

G2 - Relubricatable Execution

The G2 designation identifies an execution designed to accommodate relubrication through the appropriate lubrication passages.

When installed in a compatible housing with a grease fitting, the bearing can receive additional lubricant through the housing lubrication system.

The grease passages must align correctly with the bearing's lubrication arrangement.

Eccentric Locking Collar - How Does It Work?

One of the defining features of SNR EX212G2 is its eccentric shaft locking mechanism.

The locking collar has an eccentric internal geometry that works with the corresponding eccentric section of the bearing's extended inner ring.

When the collar is rotated into the locking position, the eccentric surfaces create a mechanical locking action.

The collar is then secured using its locking screw.

Advantages of Eccentric Collar Mounting

The design provides:

• Mechanical shaft locking without an adapter sleeve.

• A defined method of securing the extended inner ring.

• Suitability for correctly designed rotating shaft assemblies.

• A locking arrangement distinct from conventional two-set-screw inserts.

The effectiveness of the connection depends on correct shaft dimensions, mounting procedure and operating conditions.

Locking Screw Tightening Torque

For the EX212G2 execution, the specified locking screw tightening torque is 22 Nm.

The screw is M10x1.25 and uses a 5 mm hexagon socket.

The manufacturer's installation procedure should be followed when positioning and tightening the collar.

Incorrect installation may lead to shaft slippage, loosening or premature bearing damage.

Construction of SNR EX212G2

Inner Ring

The bearing has an extended inner ring designed to accommodate the eccentric locking collar.

The inner ring rotates with the shaft once the locking mechanism has been correctly secured.

Outer Ring

The outer ring has a spherical external surface.

This geometry allows the bearing insert to align within the corresponding spherical seat of a compatible bearing housing.

Ball and Cage Assembly

The bearing contains a single row of balls operating between the inner and outer raceways.

The rolling elements transmit radial loads and permissible axial loads according to the bearing's design limits.

The specific cage construction should be confirmed from the manufacturer's technical documentation where it is relevant to the application.

Sealing System

SNR EX212G2 incorporates sealing on both sides of the bearing.

The seals help retain lubricant and restrict the entry of contaminants.

Additional protective features associated with the insert design may improve protection in industrial operating environments.

However, the seals do not make the bearing completely waterproof or suitable for unrestricted pressure washing or aggressive chemical exposure.

Self-Alignment and Shaft Misalignment Compensation

The spherical outer ring surface is an essential feature of the EX212G2 design.

When installed in a matching spherical housing seat, the insert can accommodate limited initial angular misalignment between the shaft and housing.

This is particularly useful in bearing arrangements where perfect alignment of the mounting surfaces is difficult to achieve.

Self-Alignment vs Internal Bearing Clearance

These characteristics must be distinguished.

Self-alignment is provided by the spherical outer ring surface working with the housing seat.

Internal clearance refers to the permissible relative movement between the rolling elements and raceways inside the bearing.

The EX212G2 execution is specified with C3 internal clearance.

C3 clearance does not mean the bearing can accommodate unlimited shaft misalignment.

Similarly, the spherical outer surface does not make the bearing suitable for continuous large angular movements during operation.

The permitted misalignment must remain within the limits of the bearing and housing arrangement.

Load Ratings - SNR EX212G2

The bearing has the following catalogue load ratings:

Dynamic Load Rating

The basic dynamic load rating is used in bearing life calculations under defined operating conditions.

It is not a universal maximum permissible working load.

Static Load Rating

The basic static load rating is used when evaluating permanent deformation risk under static or very low-speed loading.

Actual bearing selection must account for the complete load spectrum, operating speed, lubrication and expected service life.

Combined Loads

Insert ball bearings can accommodate radial loads and certain axial loads within their design limits.

The permissible axial loading depends on the bearing construction, shaft locking arrangement and operating conditions.

An axial load capacity should not be inferred directly from the radial dynamic load rating.

SNR EX212G2 vs Other Insert Bearing Executions

Different insert bearing executions may share the same nominal shaft diameter but use different locking mechanisms, seals or temperature specifications.

These executions should not be treated as automatically interchangeable.

Differences may affect the overall installation width, shaft locking method, sealing performance and permissible operating conditions.

Bearing Housing Compatibility

SNR EX212G2 is intended for installation in a compatible bearing housing with a spherical seating surface.

The NTN-SNR product range includes bearing units such as EXF212 and EXT212 incorporating the EX212G2 insert.

However, this does not mean that every housing identified by the size number 212 is compatible.

What Must Be Checked?

Before selecting a replacement insert, verify:

• Housing spherical seat geometry.

• Bearing outside diameter.

• Available axial installation space.

• Eccentric locking collar clearance.

• Shaft diameter and tolerances.

• Housing lubrication passages.

• Required sealing arrangement.

• Operating loads and temperatures.

The complete bearing unit should be evaluated as a mechanical assembly rather than selecting the insert solely by its bore diameter.

Applications of SNR EX212G2

Self-aligning insert ball bearings are commonly used in industrial shaft support systems where installation flexibility and secure shaft attachment are required.

The EX212G2 design may be considered for:

• Conveyor systems.

• Material handling machinery.

• Agricultural equipment.

• Industrial auxiliary drives.

• Rotating shafts supported by bearing housings.

• Selected production and processing machinery.

These are general application categories for insert ball bearings and do not represent confirmed OEM applications of the exact SNR EX212G2 part number.

The suitability of the bearing must be determined from the actual operating conditions.

Bearing Selection and Interchangeability

Before ordering SNR EX212G2, check the following technical requirements.

1. Complete Manufacturer Designation

Confirm that the required execution is EX212G2 rather than another insert bearing with a similar dimensional designation.

2. Shaft Diameter

The bearing has a nominal bore diameter of 60 mm.

The shaft must meet the relevant dimensional and surface requirements.

3. Housing Compatibility

The bearing has a spherical outside diameter of 110 mm.

The housing must provide the corresponding spherical seat.

4. Overall Width

The complete bearing and locking collar assembly has an overall width of 77.7 mm.

This is particularly important where adjacent machine components restrict axial installation space.

5. Shaft Locking Method

Confirm that an eccentric locking collar is required.

Do not substitute a set-screw insert without checking the complete mounting arrangement.

6. Load Capacity

Evaluate radial and axial loads against the bearing's permissible operating conditions.

7. Internal Clearance

Confirm that the C3 clearance execution is appropriate for the shaft fit, temperature and operating requirements.

8. Relubrication

Check whether the housing is equipped with a grease fitting and whether its lubrication passages are compatible with the G2 execution.

9. Temperature

The standard EX212G2 execution has a stated operating temperature range of -20°C to +100°C.

Higher-temperature applications require an appropriate alternative execution and verification of the complete bearing unit.

Installation and Maintenance

Inspect the Shaft

Before installation, check the shaft diameter, surface condition and cleanliness.

Damage or dimensional errors can compromise the locking connection.

Install the Bearing in the Housing

Position the insert within the matching spherical housing seat.

The bearing must be able to achieve the alignment required by the installation.

Align the Shaft

Ensure that the shaft is correctly positioned before securing the locking collar.

Avoid forcing the bearing into an unsuitable angular position.

Secure the Eccentric Locking Collar

Lock the eccentric collar according to the NTN-SNR installation procedure.

Tighten the locking screw to the specified torque of 22 Nm.

Check Lubrication

Where the housing permits relubrication, confirm that the lubrication passages are correctly positioned.

Use an appropriate lubricant and follow the recommended relubrication procedure.

Excessive grease, incompatible lubricants or incorrect lubrication intervals can adversely affect bearing operation.

Check Operation

After installation, verify that the shaft rotates correctly and that no abnormal noise, vibration or temperature increase occurs.

Frequently Asked Questions - SNR EX212G2

What are the dimensions of SNR EX212G2?

The bearing has a 60 mm bore diameter, 110 mm outside diameter and 77.7 mm overall width including the eccentric locking collar. Its complete dimensions are 60x110x77.7 mm.

Is SNR EX212G2 a self-aligning bearing?

Yes. It is a self-aligning insert ball bearing with a spherical outer ring surface designed for installation in a compatible bearing housing.

How is SNR EX212G2 secured to the shaft?

It uses an eccentric locking collar secured by a locking screw.

What does G2 mean in SNR EX212G2?

G2 identifies the relubricatable execution, allowing lubricant to be supplied through the appropriate lubrication passages when installed in a compatible housing.

What are the load ratings of SNR EX212G2?

The basic dynamic load rating C is 52.5 kN, and the basic static load rating C0 is 32.8 kN.

What is the tightening torque for the eccentric locking collar?

The specified locking screw tightening torque is 22 Nm.

Does SNR EX212G2 have C3 internal clearance?

Yes. The EX212G2 execution is specified with C3 internal clearance.

Can SNR EX212G2 be installed without a bearing housing?

The bearing is designed as an insert for a compatible housing. Installing it without the required spherical outer ring support does not correspond to its intended mounting arrangement.

Is SNR EX212G2 sealed?

Yes. The bearing incorporates sealing on both sides to help retain lubricant and reduce contamination.

What is the operating temperature range of SNR EX212G2?

The standard execution has a specified operating temperature range of -20°C to +100°C. Applications outside this range require an appropriate alternative execution.

SNR EX212G2 - Key Technical Information

SNR EX212G2 is a self-aligning insert ball bearing with dimensions of 60x110x77.7 mm. It features a spherical outer ring, eccentric locking collar, double-sided sealing and relubricatable G2 construction. The basic dynamic load rating is 52.5 kN and the static load rating is 32.8 kN. It is designed for installation in compatible bearing housings and operates within a specified temperature range of -20°C to +100°C.

SNR EX212G2 at simmering.pl

SNR EX212G2 can be searched by its complete manufacturer designation at simmering.pl.

Based in Lublin, Poland, simmering.pl supplies industrial bearings, bearing inserts and sealing products to maintenance departments, technical purchasing teams and international B2B customers.

When identifying this bearing, the eccentric locking collar, overall width and housing compatibility are particularly important.

Stock availability, dispatch dates and international shipping arrangements can be confirmed when submitting an inquiry.