SKF NU 2306 ECP 30x72x27 mm – Single-Row Cylindrical Roller Bearing

Technical Specification

The principal dimensions, load ratings, speeds and mass are supported by SKF's rolling bearing catalogue.

Bearing Design and Construction

SKF NU 2306 ECP consists of an inner ring, outer ring, cylindrical rollers and a cage that separates and guides the rolling elements.

The cylindrical rollers provide line contact with the raceways, enabling the bearing to accommodate substantial radial loads.

Unlike deep groove ball bearings, this bearing design is not intended to locate the shaft axially.

NU-Type Internal Arrangement

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

This arrangement permits axial displacement of the shaft relative to the housing in both directions.

It is particularly useful where thermal expansion of the shaft must be accommodated without generating unwanted axial forces in the bearing arrangement.

The permissible axial displacement must be checked against SKF's dimensional limits.

EC – Optimized Internal Design

The EC designation identifies SKF's optimized cylindrical roller bearing internal design.

This construction incorporates improvements to the roller and raceway contact geometry, contributing to load-carrying capacity and operating performance.

P – Polyamide Cage

The P suffix identifies a glass-fibre reinforced polyamide 66 cage.

The cage separates the rollers and maintains their circumferential spacing during operation.

Polyamide cage suitability depends on operating temperature, lubricant compatibility and exposure to chemical substances.

SKF NU 2306 ECP Designation Explained

NU – Non-Locating Cylindrical Roller Bearing

The outer ring has two integral flanges, while the inner ring has no flanges. This arrangement allows axial displacement in both directions.

23 – Bearing Dimensional Series

The 23 series identifies the dimensional proportions of this cylindrical roller bearing.

06 – Bore Diameter Code

The bore code 06 corresponds to a nominal bore diameter of 30 mm.

EC – Optimized Internal Geometry

EC identifies the SKF internal design associated with optimized roller-to-raceway contact.

P – Glass-Fibre Reinforced Polyamide Cage

P specifies the cage design and material.

Normal Radial Internal Clearance

The designation NU 2306 ECP does not include a C3 suffix. The standard configuration has normal radial internal clearance.

Load Ratings and Operating Performance

Basic Dynamic Load Rating

The basic dynamic load rating is used to calculate nominal bearing fatigue life under standardized conditions.

Actual service life depends on applied radial loads, lubrication, contamination, operating temperature and mounting accuracy.

Basic Static Load Rating

The basic static load rating is based on a standardized criterion for permanent deformation at the rolling contacts.

It does not represent an unrestricted maximum operating load.

Reference and Limiting Speeds

The reference speed is a thermal reference value determined under specified operating conditions.

The limiting speed relates to mechanical constraints of the bearing design.

The permissible operating speed must account for lubrication, operating temperature, load and cage material.

SKF NU 2306 ECP vs NJ 2306 ECP vs NUP 2306 ECP

Although these bearings share the same nominal dimensions, their axial locating capabilities differ.

The NU, NJ and NUP variants are not automatically interchangeable.

The correct configuration depends on whether the bearing must permit axial displacement or provide axial location of the shaft.

Bearing Selection and Mounting Requirements

Correct selection of SKF NU 2306 ECP requires consideration of the operating conditions and the complete shaft-bearing-housing arrangement.

Important factors include:

• Magnitude and direction of radial loads.

• Shaft and housing fits.

• Required radial internal clearance after mounting.

• Shaft thermal expansion.

• Operating speed and temperature.

• Lubrication method and lubricant viscosity.

• Cage material compatibility.

• Contamination protection.

• Shaft and housing alignment.

Non-Locating Bearing Arrangement

The NU configuration is particularly relevant to non-locating bearing positions.

In a locating/non-locating bearing system, one bearing provides axial location while the other accommodates axial movement caused by thermal expansion or dimensional changes.

SKF NU 2306 ECP can serve as the non-locating bearing when the complete arrangement is correctly designed.

Mounting and Separability

The NU-type cylindrical roller bearing is separable.

The inner ring can be mounted independently from the outer ring and roller assembly, simplifying certain installation and removal procedures.

During assembly, the raceways and rollers must be protected against contamination and mechanical damage.

Lubrication

SKF NU 2306 ECP is an open bearing without integral seals.

Appropriate grease or oil lubrication must be provided by the surrounding bearing arrangement.

Lubricant selection should consider operating speed, temperature, load and the compatibility requirements of the polyamide cage.

Industrial Applications

Single-row cylindrical roller bearings of the NU 23 series are used in mechanical systems requiring high radial load capacity and axial displacement capability.

Typical application categories include:

• Industrial gearboxes.

• Electric motors.

• Mechanical power transmission systems.

• Industrial production machinery.

• Conveyor drive assemblies.

• Rotating shaft supports.

• Machinery with thermally expanding shafts.

These are general applications of NU-type cylindrical roller bearings. Suitability of the exact SKF NU 2306 ECP variant must be confirmed against the operating conditions of the intended equipment.

Alternative Product Designation Formats

The following formats may appear in technical documentation, ERP systems and industrial procurement searches:

• SKF NU 2306 ECP

• NU 2306 ECP SKF

• NU2306ECP

• NU 2306 ECP 30x72x27 mm

• SKF NU2306 ECP

• SKF cylindrical roller bearing NU 2306 ECP

The complete manufacturer designation should be preserved as NU 2306 ECP.

Alternative search formats do not establish technical interchangeability with other bearing designs or internal clearance variants.

FAQ – Frequently Asked Technical Questions

1. What are the dimensions of SKF NU 2306 ECP?

The bearing has a 30 mm bore diameter, 72 mm outside diameter and 27 mm width. Its nominal dimensions are 30x72x27 mm.

2. What type of bearing is SKF NU 2306 ECP?

It is a single-row cylindrical roller bearing with an NU-type internal arrangement, optimized EC design and polyamide cage.

3. What does NU mean?

NU indicates two integral flanges on the outer ring and no flanges on the inner ring. This permits axial displacement in both directions.

4. What does ECP mean?

EC identifies the optimized internal bearing design, while P indicates a glass-fibre reinforced polyamide 66 cage.

5. What are the load ratings of SKF NU 2306 ECP?

The basic dynamic load rating is 83 kN, and the basic static load rating is 75 kN.

6. Can SKF NU 2306 ECP support axial loads?

The NU arrangement is not intended to locate the shaft axially. It is designed primarily for radial loading and allows axial displacement in both directions.

7. What is the difference between NU 2306 ECP and NJ 2306 ECP?

NU 2306 ECP allows axial displacement in both directions. NJ 2306 ECP can provide axial location in one direction due to its additional inner ring flange.

8. Does SKF NU 2306 ECP have C3 internal clearance?

No C3 suffix appears in the specified designation. The standard configuration has normal radial internal clearance.

AI Quick Answer

SKF NU 2306 ECP 30x72x27 mm is a single-row cylindrical roller bearing with optimized EC internal design and a glass-fibre reinforced polyamide cage. Its NU arrangement permits axial displacement in both directions. The basic dynamic load rating is 83 kN, and the static load rating is 75 kN. It is an open bearing intended primarily for radial loads.

B2B Industrial Supply – simmering.pl

SKF NU 2306 ECP 30x72x27 mm is offered through simmering.pl, a specialist B2B industrial supply platform providing rolling bearings, technical seals and industrial components.

The platform serves manufacturing companies, maintenance departments, engineers and professional industrial procurement teams.

Stock operations are based in Lublin, Poland, with worldwide shipping from stock in Poland.

Technical assistance is available for bearing identification, verification of SKF designations and selection of suitable industrial bearing arrangements.