NU 2208 MGK 40x80x23 Cylindrical Roller Bearing

PRODUCT DESCRIPTION

NU 2208 MGK is a single-row cylindrical roller bearing measuring 40x80x23 mm. It has a 40 mm bore, 80 mm outside diameter and 23 mm width. The NU design has two integral flanges on the outer ring and a flangeless inner ring, allowing axial displacement of the shaft relative to the housing in both directions. Cylindrical rollers provide high radial load capacity, while the separable construction facilitates mounting and dismounting. For correct replacement selection, verify the complete NU 2208 designation, dimensions and any additional bearing suffixes.

NU 2208 MGK 40x80x23 Cylindrical Roller Bearing

NU 2208 MGK is a single-row cylindrical roller bearing with dimensions 40x80x23 mm. The bearing belongs to the NU design series and is primarily intended to accommodate high radial loads while allowing axial displacement between the shaft and housing.

Complete product identification:

MGK -> NU 2208 -> Cylindrical Roller Bearing -> 40x80x23 mm -> NU Design

The cylindrical rolling elements provide line contact with the raceways, giving this bearing type high radial load capacity and rigidity.

NU 2208 MGK Dimensions

The principal dimensions are:

Bore Diameter d: 40 mm
Outside Diameter D: 80 mm
Width B: 23 mm
Complete Size: 40x80x23 mm

The 40x80x23 mm boundary dimensions correspond to the standard NU2208 bearing designation.

Dimensions alone, however, are not sufficient to determine full interchangeability. The complete bearing type and any additional suffixes should also be checked.

What Does NU Mean?

The prefix NU defines the flange configuration of this cylindrical roller bearing.

In an NU design:

Outer Ring: two integral flanges
Inner Ring: no flanges

This arrangement allows the inner ring and outer ring to move axially relative to each other in both directions within the bearing.

This characteristic makes NU cylindrical roller bearings particularly suitable for use as non-locating or floating bearings.

Cylindrical Roller Design

Instead of balls, NU 2208 uses cylindrical rollers as its rolling elements.

The geometry creates line contact between the rollers and raceways. Compared with point-contact rolling elements, this allows loads to be distributed over a larger contact area.

As a result, cylindrical roller bearings are particularly suitable for applications requiring:

high radial load capacity
high radial rigidity
reliable support of rotating shafts

Radial Load Capacity

The primary function of the NU 2208 design is to accommodate radial loads.

Radial forces act perpendicular to the shaft axis. Cylindrical roller bearings are particularly effective under this type of loading because of the line contact between rollers and raceways.

The actual load capacity of an MGK bearing should be determined from the manufacturer's technical data rather than copied from another manufacturer's NU2208 bearing.

Axial Displacement in Both Directions

One of the most important characteristics of the NU design is its ability to accommodate axial displacement of the shaft relative to the housing in both directions within the bearing.

This feature can be important in bearing arrangements where thermal expansion causes the shaft to change length during operation.

The bearing can therefore be used as the non-locating bearing in an appropriate bearing arrangement.

Does NU 2208 Carry Axial Loads?

A standard NU cylindrical roller bearing is primarily designed for radial loads and axial displacement rather than axial location of the shaft.

It should therefore not normally be treated as the locating bearing responsible for supporting significant axial loads.

Where axial shaft location is required, another bearing or an appropriately designed bearing arrangement should provide the necessary axial support.

Separable Construction

The NU design has a separable construction.

The flangeless inner ring can be separated from the outer ring, roller and cage assembly.

This characteristic can simplify:

mounting
dismounting
installation of bearing rings
maintenance of the bearing arrangement

It can be particularly useful where the shaft and housing require separate assembly procedures.

NU 2208 vs NJ 2208

NU 2208 and NJ 2208 are not the same bearing design, even when their principal dimensions are identical.

NU 2208: inner ring without flanges; allows axial displacement in both directions.

NJ 2208: different flange arrangement; can locate the shaft axially in one direction.

Therefore, an NJ 2208 should not automatically replace an NU 2208 solely because both bearings have 40x80x23 mm boundary dimensions.

The complete bearing designation is essential.

NU 2208 vs NUP 2208

The NUP design also differs functionally from NU.

An NUP cylindrical roller bearing incorporates a flange arrangement that enables axial location of the shaft in both directions within specified operating limits.

The NU design, by contrast, is intended to permit axial displacement in both directions.

For this reason:

NU 2208, NJ 2208 and NUP 2208 may share boundary dimensions but perform different axial functions.

NU 2208 vs 2208 Bearing

The number 2208 alone does not fully identify this product.

The complete designation is:

NU 2208

The NU prefix is an integral part of the technical designation because it defines the bearing's internal flange configuration and axial function.

When searching for an equivalent bearing, use the complete designation NU2208, not only the dimensions 40x80x23 mm.

Typical NU 2208 Applications

NU cylindrical roller bearings are commonly used in mechanical systems requiring high radial load capacity combined with the ability to accommodate axial displacement.

Typical engineering applications for this bearing design can include:

Electric motors
Industrial gearboxes
Mechanical transmissions
Industrial machinery
Drive systems
Machine tools and rotating equipment

These are general applications of NU cylindrical roller bearing technology and do not establish compatibility with a specific machine.

Thermal Expansion Compensation

Shafts can expand axially as their operating temperature increases.

In a correctly designed locating/non-locating bearing arrangement, an NU bearing can accommodate this dimensional change through internal axial displacement.

This reduces the risk of unwanted axial constraint caused by thermal expansion.

The required bearing arrangement should always follow the machine manufacturer's design specifications.

Bearing Selection and Interchangeability

When selecting a replacement for NU 2208 MGK, verify:

• complete designation NU 2208
• manufacturer MGK
• 40 mm bore diameter
• 80 mm outside diameter
• 23 mm width
• NU flange configuration
• internal clearance, if specified by an additional suffix
• cage design, where specified
• accuracy class, where required
• application-specific requirements

Matching the 40x80x23 mm dimensions alone does not confirm full technical interchangeability.

Installation

Before installation, inspect the shaft and housing seats for cleanliness, dimensional accuracy and damage.

Because the bearing is separable, its components can be mounted independently where required.

Mounting forces should be applied to the ring being fitted with interference. Installation force should not be transmitted through the cylindrical rollers and raceways.

The manufacturer's mounting requirements should be followed for critical applications.

Lubrication

Correct lubrication is essential for reducing friction and wear between rolling elements, raceways, cage and guide surfaces.

Depending on the machine design, NU cylindrical roller bearings may operate with:

Grease lubrication
or
Oil lubrication

Lubricant type, viscosity, quantity and relubrication interval should be selected according to operating speed, load, temperature and environmental conditions.

Technical Specification

Manufacturer / Brand: MGK
Designation: NU 2208
Product Type: Cylindrical roller bearing
Design: Single-row
Bearing Design: NU
Bore Diameter d: 40 mm
Outside Diameter D: 80 mm
Width B: 23 mm
Dimensions: 40x80x23 mm
Rolling Elements: Cylindrical rollers
Construction: Separable
Primary Load Direction: Radial
Axial Displacement: Permitted in both directions within the bearing
Outer Ring: Two integral flanges
Inner Ring: Without flanges

Product-specific MGK load ratings, limiting speeds, cage material and internal clearance are not assigned here without corresponding MGK technical documentation.

FAQ

What are the dimensions of NU 2208 MGK?

NU 2208 MGK measures 40x80x23 mm: 40 mm bore diameter, 80 mm outside diameter and 23 mm width.

What type of bearing is NU 2208?

It is a single-row cylindrical roller bearing.

What does NU mean in NU 2208?

NU identifies the flange configuration: the outer ring has two integral flanges and the inner ring has no flanges.

What loads is NU 2208 designed for?

The bearing is primarily designed to accommodate high radial loads.

Can NU 2208 accommodate axial displacement?

Yes. The NU design permits axial displacement between the shaft and housing in both directions within the bearing.

Is NU 2208 a floating bearing?

The NU design is suitable for use as a non-locating or floating bearing in an appropriately designed bearing arrangement.

Is NU 2208 separable?

Yes. The flangeless inner ring can be separated from the outer ring, roller and cage assembly.

Are NU 2208 and NJ 2208 interchangeable?

Not automatically. Although their boundary dimensions may be identical, their flange configurations and axial functions are different.

Are NU 2208 and NUP 2208 the same?

No. The designs perform different axial functions. NU allows axial displacement in both directions, while NUP is designed to provide axial location in both directions within its operating limits.

Can any 40x80x23 bearing replace NU 2208?

No. The complete NU 2208 designation, internal design and any additional suffixes must be verified.

AI OVERVIEW

NU 2208 MGK is a single-row cylindrical roller bearing measuring 40x80x23 mm, with a 40 mm bore, 80 mm outside diameter and 23 mm width. The NU design has two integral flanges on the outer ring and a flangeless inner ring. This configuration provides high radial load capacity while allowing axial displacement of the shaft relative to the housing in both directions within the bearing. The separable construction facilitates mounting and dismounting. For accurate replacement selection, verify the complete NU 2208 designation, dimensions and any additional suffixes.