SKF NJ 2210 ECPH/C4 50x90x23 - Single Row Cylindrical Roller Bearing

Technical Specifications - SKF NJ 2210 ECPH/C4

The dimensional and construction specifications identify the NJ 2210 ECPH/C4 configuration. Exact load ratings, speed limits and bearing mass should be checked against the current SKF product data for this designation rather than transferred from another NJ 2210 variant.

What Does SKF NJ 2210 ECPH/C4 Mean?

SKF - Bearing Manufacturer

SKF is a manufacturer of rolling bearings and rotating equipment solutions for industrial applications.

The NJ 2210 ECPH/C4 belongs to the SKF family of single row cylindrical roller bearings.

Its construction is designed primarily for radial loading, with the additional ability to accommodate axial loads in one direction.

NJ - Bearing Design

The NJ designation identifies a cylindrical roller bearing with a specific flange arrangement.

The outer ring has two integral flanges, while the inner ring has one integral flange.

This configuration allows the bearing to locate a shaft axially in one direction.

The bearing can accommodate relative axial displacement in the opposite direction, subject to the design and available displacement capacity.

An NJ bearing is not intended to provide independent axial location in both directions.

2210 - Bearing Size and Dimension Series

The designation 2210 identifies the bearing size within dimension series 22.

The nominal dimensions are:

• Bore diameter (d): 50 mm.

• Outside diameter (D): 90 mm.

• Width (B): 23 mm.

The 23 mm width is an important identifying feature when comparing bearings with the same bore and outside diameters.

EC - Optimized Internal Design

The EC suffix identifies SKF's optimized internal design for cylindrical roller bearings.

This design incorporates improvements to roller geometry, the rolling contact arrangement and the interaction between roller ends and bearing flanges.

These features are intended to support the load-carrying and friction characteristics specified by SKF.

The EC designation should be retained when selecting an equivalent bearing.

PH - Glass Fibre Reinforced PEEK Cage

The PH suffix identifies a cage manufactured from glass fibre reinforced PEEK (polyether ether ketone).

The cage is guided by the rolling elements.

Its primary functions are to maintain roller spacing and support controlled roller movement during operation.

PEEK is a high-performance engineering polymer with characteristics that differ from conventional polyamide, steel and brass cage materials.

The cage material must be considered when evaluating operating temperature, lubricant compatibility and application requirements.

C4 - Increased Radial Internal Clearance

The C4 suffix specifies radial internal clearance greater than C3.

C4 clearance may be required in bearing arrangements where interference fits and temperature differences significantly reduce the available operating clearance.

However, greater clearance is not automatically preferable.

Excessive operating clearance can affect vibration, noise and load distribution between the rollers.

Construction of SKF NJ 2210 ECPH/C4

Inner and Outer Rings

The bearing has an outer ring with two integral flanges and an inner ring with one integral flange.

The flanges guide the cylindrical rollers and enable the transmission of axial loads in one direction.

The separable NJ construction allows the bearing components to be mounted separately, which can simplify assembly.

Correct ring orientation is essential to obtain the intended axial locating function.

Cylindrical Rollers

The rolling elements are cylindrical rollers operating between the raceways of the inner and outer rings.

Their line contact with the raceways provides a relatively large contact area compared with the point contact found in conventional ball bearings.

This construction is particularly suitable for carrying substantial radial loads.

The rollers and flanges also allow the bearing to accommodate axial loads in one direction, within the limits specified for the application.

PH Cage

The glass fibre reinforced PEEK cage maintains the required spacing between the cylindrical rollers.

Its roller-guided configuration controls the movement of the cage relative to the rolling elements.

This construction differs from bearings fitted with pressed steel, machined brass or other polymer cages.

A replacement bearing with a different cage material should not be selected solely on the basis of matching dimensions.

Open Bearing Construction

SKF NJ 2210 ECPH/C4 is an open bearing without integral contact seals or metal shields.

Lubrication and protection against contamination must be provided by the surrounding machine assembly.

The lubricant and sealing arrangement should be selected according to operating conditions.

Operating Principle and Load Transmission

SKF NJ 2210 ECPH/C4 transmits loads through rolling contact between cylindrical rollers and the raceways of the bearing rings.

The line contact geometry enables the bearing to accommodate substantial radial loading.

The NJ flange arrangement additionally permits axial load transmission in one direction.

The bearing can therefore serve as a radially loaded shaft support with a one-direction axial locating function.

The optimized EC internal design and PH cage form part of the bearing's specific construction.

The C4 radial internal clearance must be considered together with shaft and housing fits, operating temperature and the expected thermal expansion of the machine components.

During operation, the effective clearance may decrease because of interference fits and temperature differences.

Correct selection is necessary to avoid excessive internal loading, abnormal temperatures or insufficient operating clearance.

Alternative Designations and Reference Numbers

The bearing may be identified using the following notation variants:

• SKF NJ 2210 ECPH/C4

• NJ 2210 ECPH/C4 SKF

• SKF NJ 2210 ECPH C4

• NJ2210ECPH/C4

• NJ 2210 ECPH C4 SKF

The catalog designation is NJ 2210 ECPH/C4.

The slash preceding C4 is part of the SKF designation format and should be preserved when ordering or identifying the bearing.

The versions without the slash are alternative search notations, not replacements for the official catalog designation.

SKF NJ 2210 ECPH/C4 vs Other Bearing Variants

NJ 2210 ECPH/C4 vs NJ 2210 ECPH/C3

Both designations identify the same basic NJ bearing arrangement and PH cage construction.

The difference is the radial internal clearance class.

C4 provides greater initial radial clearance than C3.

This difference may affect operating clearance after mounting, particularly where interference fits and significant temperature differences are present.

The two versions should not be considered automatically interchangeable.

NJ 2210 ECPH/C4 vs NJ 2210 ECPH

A designation without an additional clearance suffix generally indicates normal radial internal clearance.

The C4 version has greater radial internal clearance.

The appropriate clearance class must be selected according to the application requirements.

NJ 2210 vs NU 2210

The NJ design has two flanges on the outer ring and one flange on the inner ring.

The NU design has two flanges on the outer ring and no flanges on the inner ring.

An NU bearing allows relative axial displacement between the rings in both directions.

An NJ bearing can provide axial location in one direction.

These designs perform different functions within a shaft support arrangement.

NJ 2210 vs NUP 2210

The NUP design incorporates an additional flange ring that enables axial location in both directions.

The NJ design provides axial location in only one direction.

The correct bearing type depends on the required axial positioning of the shaft.

Bearing Selection and Interchangeability

Before purchasing SKF NJ 2210 ECPH/C4, verify:

1. Complete SKF designation NJ 2210 ECPH/C4.

2. Bore diameter of 50 mm.

3. Outside diameter of 90 mm.

4. Bearing width of 23 mm.

5. NJ flange arrangement.

6. EC optimized internal design.

7. PH glass fibre reinforced PEEK cage.

8. C4 radial internal clearance.

9. Radial and axial loading conditions.

10. Required operating speed.

11. Shaft and housing fits.

12. Operating temperature and lubrication requirements.

Identical dimensions of 50x90x23 mm do not guarantee complete interchangeability.

Differences in flange arrangement, cage material, internal clearance and internal design can significantly affect bearing operation.

The complete manufacturer designation should be checked before selecting a replacement.

Applications of SKF NJ 2210 ECPH/C4

Single row NJ cylindrical roller bearings are used in rotating shaft arrangements requiring radial load support and axial location in one direction.

Typical applications for this bearing design include:

• Industrial gearboxes.

• Mechanical transmission assemblies.

• Industrial rotating shafts.

• Manufacturing machinery.

• Selected industrial drive systems.

• Bearing arrangements requiring one-direction axial location.

These are typical applications of the NJ bearing design, not confirmed equipment-specific applications of the exact NJ 2210 ECPH/C4 designation.

The C4 clearance version should be selected only where justified by operating conditions, engineering calculations or the equipment manufacturer's documentation.

Installation and Operating Recommendations

Preparation Before Installation

Clean the shaft, housing and all mating surfaces before assembly.

Inspect the bearing rings, raceways, flanges and cage for damage or contamination.

Ensure that the bearing has been stored correctly and remains free from foreign particles.

Mounting

When installing a ring with an interference fit, apply the mounting force directly to that ring.

Do not transmit mounting forces through the cylindrical rollers.

The separable NJ design can simplify mounting, but correct alignment and component orientation remain essential.

Internal Clearance

C4 specifies the radial internal clearance class before mounting.

The effective operating clearance may be reduced by interference fits and temperature differences.

Bearing selection should therefore consider the expected mounted and operating clearance.

Lubrication

The bearing has an open construction and requires an appropriate lubrication system.

Oil or grease selection must consider operating speed, load, temperature and the machine manufacturer's requirements.

The lubricant must also be compatible with the PH cage material.

Storage

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

Protect it from moisture, dust, vibration and mechanical damage.

FAQ - SKF NJ 2210 ECPH/C4

1. What are the dimensions of SKF NJ 2210 ECPH/C4?

The bearing has a bore diameter of 50 mm, an outside diameter of 90 mm and a width of 23 mm.

2. What does NJ mean in the SKF designation?

NJ identifies a cylindrical roller bearing with two flanges on the outer ring and one flange on the inner ring. This design provides axial location in one direction.

3. What does EC mean?

EC identifies SKF's optimized internal cylindrical roller bearing design, including improvements to roller geometry and the interaction between rollers and flanges.

4. What does PH mean?

PH specifies a glass fibre reinforced PEEK cage guided by the rolling elements.

5. What does C4 clearance mean?

C4 indicates radial internal clearance greater than C3. The correct clearance class depends on mounting fits, operating temperature and required operating clearance.

6. Are NJ 2210 ECPH/C4 and NJ 2210 ECPH/C3 interchangeable?

Not automatically. They have different radial internal clearance classes, which may affect operating conditions after installation.

7. Does SKF NJ 2210 ECPH/C4 have seals?

No. It is an open cylindrical roller bearing without integral seals or shields. Lubrication and contamination protection must be provided by the surrounding assembly.

8. What loads can SKF NJ 2210 ECPH/C4 accommodate?

The bearing is primarily designed for radial loads and can accommodate axial loads in one direction. Permissible operating loads depend on the bearing ratings, lubrication, operating conditions and axial load limitations.

SKF NJ 2210 ECPH/C4 - Key Technical Information

SKF NJ 2210 ECPH/C4 is a single row cylindrical roller bearing measuring 50x90x23 mm. The NJ design provides axial location in one direction, EC identifies optimized internal geometry, PH specifies a glass fibre reinforced PEEK cage, and C4 indicates increased radial internal clearance. Its open, separable construction is intended primarily for radial loading.

The SKF NJ 2210 ECPH/C4 50x90x23 mm bearing is offered by simmering.pl, a specialist supplier of rolling bearings, industrial seals and mechanical components.

TG Ersatzteile Polska Sp. z o.o. operates a warehouse in Lublin, Poland, supplying industrial companies, maintenance departments, engineering businesses and international B2B customers.

Products are shipped from stock in Poland, with shipping options available throughout Europe and worldwide.