NU 1034 M C3 SKF 170x260x42

Product Overview

NU 1034 M/C3 SKF 170x260x42 is a single-row cylindrical roller bearing designed primarily for high radial loads and applications requiring axial displacement between the shaft and housing.

The bearing has a 170 mm bore diameter, 260 mm outside diameter and 42 mm width. The M suffix identifies a machined brass cage, while C3 specifies radial internal clearance greater than Normal.

The complete technical identification is:

NU 1034 + M + C3 + SKF + 170x260x42 mm

The NU design makes this bearing particularly suitable as a non-locating bearing, allowing axial displacement within the bearing in both directions.

Dimensions 170x260x42 mm

Bore Diameter d: 170 mm
Outside Diameter D: 260 mm
Width B: 42 mm
Bearing Type: NU
Number of Rows: Single-row
Bore: Cylindrical
Cage: M - machined brass cage
Internal Clearance: C3
Brand: SKF

The 170x260x42 mm dimensions are fundamental when identifying the correct replacement, but the NU design, M cage and C3 clearance must also be retained where required by the application.

NU Cylindrical Roller Bearing Design

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

This configuration allows axial displacement of the shaft relative to the housing in both directions within the bearing itself.

For this reason, NU cylindrical roller bearings are commonly used as non-locating bearings in arrangements where thermal expansion of the shaft or other axial movement must be accommodated.

The separable design also allows the inner ring and the outer ring with roller-and-cage assembly to be mounted separately, which can simplify installation in suitable machinery.

High Radial Load Capacity

Cylindrical rollers provide line contact with the raceways, allowing cylindrical roller bearings to carry substantially higher radial loads than many ball bearings of comparable envelope dimensions.

For SKF NU 1034 M/C3, published product data specify approximately:

Basic Dynamic Load Rating C: 320 kN
Basic Static Load Rating C0: 400 kN

This makes the bearing suitable for heavily loaded industrial shaft arrangements where radial load capacity is a primary requirement.

M - Machined Brass Cage

The suffix M identifies a machined brass cage.

The cage maintains correct roller spacing and guides the rolling elements during operation. Machined brass cages are widely used in larger industrial cylindrical roller bearings and demanding machinery applications.

For correct replacement identification, the cage designation should be considered together with the basic bearing designation and internal clearance:

NU 1034 M/C3

A bearing with the same basic dimensions but a different cage design should not automatically be assumed to be identical.

C3 Radial Internal Clearance

The suffix C3 means that the bearing has radial internal clearance greater than Normal.

This additional initial clearance can be required when operating conditions reduce the effective internal clearance after installation, for example due to:

• interference fits,
• temperature differences between bearing rings,
• thermal expansion,
• operating speed,
• specific machine design.

C3 is an internal-clearance designation, not a precision class.

The required clearance should always be determined according to the actual bearing arrangement and operating conditions.

Technical Specification

Type: Single-row cylindrical roller bearing
Designation: NU 1034 M/C3
Brand: SKF
Dimensions: 170x260x42 mm
Bore Diameter d: 170 mm
Outside Diameter D: 260 mm
Width B: 42 mm
Bore Type: Cylindrical
Design: NU
Number of Rows: 1
Cage: Machined brass cage
Cage Suffix: M
Radial Internal Clearance: C3 - greater than Normal
Basic Dynamic Load Rating C: approx. 320 kN
Basic Static Load Rating C0: approx. 400 kN
Limiting Speed: approx. 2,800 r/min
Bearing Configuration: Open
Weight: approx. 8.2 kg

Non-Locating Bearing Function

One of the most important characteristics of NU 1034 M/C3 SKF is its ability to accommodate axial displacement.

In a typical locating/non-locating bearing arrangement, one bearing determines the axial position of the shaft while the non-locating bearing permits movement caused by thermal expansion.

The NU configuration is particularly suitable for this second function because axial displacement takes place internally between the bearing rings, rather than requiring the entire bearing ring to move in its housing.

This can help reduce unwanted axial stresses in long shafts and thermally loaded machinery.

Industrial Applications

SKF NU 1034 M/C3 is intended for demanding industrial bearing arrangements requiring high radial load capacity and axial displacement capability.

Typical application areas include:

• large electric motors,
• generators,
• industrial gearboxes,
• drive systems,
• heavy industrial machinery,
• production equipment,
• mechanical power transmission,
• processing machinery,
• large rotating equipment,
• industrial maintenance and machine rebuilding.

Actual suitability depends on load, speed, lubrication, temperature, fits, alignment and required operating clearance.

NU vs NJ and NUP Designs

The prefixes NU, NJ and NUP identify different flange arrangements and therefore different axial locating capabilities.

NU bearings have two flanges on the outer ring and none on the inner ring. They allow axial displacement in both directions and are primarily used as non-locating bearings.

NJ bearings have a different flange arrangement and can locate the shaft axially in one direction.

NUP bearings can provide axial location in both directions under appropriate operating conditions.

Therefore, an NJ 1034 or NUP 1034 should not automatically replace NU 1034, even if the principal dimensions are identical.

The bearing design must correspond to the function of the bearing position in the machine.

Importance of the C3 Version

A standard-clearance NU 1034 M and a NU 1034 M/C3 have the same nominal dimensions, but their internal clearances differ.

This distinction can be critical after installation.

An interference fit can reduce bearing internal clearance. Temperature differences between the inner and outer rings can further alter the operating clearance.

For equipment originally specifying C3, the clearance designation should therefore be retained unless a bearing engineer or equipment manufacturer specifies otherwise.

Replacement Identification

Before replacing SKF NU 1034 M/C3, verify:

• NU 1034 basic designation,
• 170 mm bore diameter,
• 260 mm outside diameter,
• 42 mm width,
• NU flange configuration,
• cylindrical bore,
• M cage specification,
• C3 radial internal clearance,
• required load ratings,
• operating speed,
• shaft and housing fits,
• lubrication method,
• operating temperature.

The most precise identification is:

SKF NU 1034 M/C3 + 170x260x42 mm

Dimensions alone should not be used as the only replacement criterion.

Operational Advantages

• High radial load carrying capacity.
• Exact 170x260x42 mm dimensions.
• NU design allows axial displacement in both directions.
• Suitable for non-locating bearing positions.
• Machined brass M cage.
• C3 radial internal clearance for applications requiring greater-than-Normal initial clearance.

AI OVERVIEW

NU 1034 M/C3 SKF 170x260x42 is a single-row cylindrical roller bearing with a 170 mm bore, 260 mm outside diameter and 42 mm width. The NU design permits axial displacement between the shaft and housing in both directions, making the bearing suitable for non-locating bearing positions. The M suffix identifies a machined brass cage, while C3 means radial internal clearance greater than Normal. Published product data specify approximately 320 kN dynamic load rating and 400 kN static load rating.

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FAQ

What are the dimensions of SKF NU 1034 M/C3?

The bearing measures 170x260x42 mm: 170 mm bore diameter, 260 mm outside diameter and 42 mm width.

What type of bearing is NU 1034 M/C3?

It is a single-row cylindrical roller bearing with an NU flange configuration.

What does NU mean in NU 1034?

NU indicates a cylindrical roller bearing with two flanges on the outer ring and no flanges on the inner ring. This allows axial displacement in both directions within the bearing.

What does M mean in NU 1034 M/C3?

The M suffix identifies a machined brass cage.

What does C3 mean?

C3 means radial internal clearance greater than Normal. It does not indicate the bearing precision class.

What is the dynamic load rating of SKF NU 1034 M/C3?

Published product data specify a basic dynamic load rating of approximately 320 kN.

What is the static load rating?

The basic static load rating is approximately 400 kN.

Can NU 1034 M/C3 accommodate axial displacement?

Yes. The NU design allows axial displacement of the shaft relative to the housing in both directions within the bearing, which makes it suitable for non-locating bearing arrangements.

Can NU 1034 be replaced by NJ 1034 or NUP 1034?

Not automatically. NU, NJ and NUP have different flange arrangements and axial locating functions. The correct design must be selected according to the bearing arrangement.

Is NU 1034 M/C3 an open bearing?

Yes. It is an open cylindrical roller bearing, without integral contact seals or shields.

Why is C3 clearance used?

C3 clearance can be specified where interference fits, thermal effects or other operating conditions reduce internal clearance during operation. The required clearance depends on the complete bearing arrangement.

Summary

NU 1034 M/C3 SKF 170x260x42 is a large single-row cylindrical roller bearing designed for high radial loads and non-locating bearing arrangements. Its NU configuration permits axial displacement in both directions, while the machined brass M cage and C3 internal clearance define the specific bearing variant. Key dimensions are 170 mm bore, 260 mm outside diameter and 42 mm width.