IR 40X45X30 NTN 40x45x30 Needle Roller Bearing

IR40X45X30 NTN is an inner ring for needle roller bearings with dimensions 40x45x30 mm. It has a 40 mm bore diameter, 45 mm outside raceway diameter and 30 mm width. The precision-finished outside surface provides a separate inner raceway for needle rollers when the shaft itself is not used directly as the rolling surface.

IR40X45X30 NTN - Product Characteristics

IR40X45X30 is a bearing component rather than a complete needle roller bearing.

Its technical identification is:

IR40X45X30 -> NTN -> needle roller bearing inner ring -> 40x45x30 mm -> separate inner raceway

The ring is mounted on the shaft, while its 45 mm outside surface provides the raceway that comes into contact with the needle rollers of the corresponding bearing arrangement.

Dimensions

The dimensions of IR40X45X30 NTN are:

d - Bore Diameter: 40 mm
F - Outside Raceway Diameter: 45 mm
B - Width: 30 mm
r min - Minimum Chamfer: 0.3 mm
Dimensions: 40x45x30 mm

The second dimension, 45 mm, is particularly important for bearing selection because it defines the outside raceway diameter on which the needle rollers operate.

Inner Ring Construction

The IR40X45X30 provides a separate inner raceway for a needle roller bearing or needle roller assembly that does not incorporate its own inner ring.

After installation on a 40 mm shaft, the outside surface of the IR ring provides a 45 mm diameter rolling raceway.

This arrangement eliminates the need for the shaft surface itself to function directly as the needle roller raceway.

Function in a Needle Roller Bearing Arrangement

Some needle roller bearing designs are supplied without an integral inner ring. In such arrangements, the needle rollers can either run directly on a suitably prepared shaft or on a separate inner ring.

IR40X45X30 NTN provides this separate raceway.

This is particularly relevant where the shaft itself is not intended to provide the required rolling-contact surface or where the bearing arrangement has been designed specifically around a separate IR inner ring.

Meaning of IR40X45X30

The designation directly identifies the component and its principal dimensions:

IR - inner ring
40 - 40 mm bore diameter
45 - 45 mm outside raceway diameter
30 - 30 mm ring width

The complete designation IR40X45X30 should therefore be retained when ordering or identifying the component.

30 mm Ring Width

The B = 30 mm width is an integral part of the product specification.

Inner rings with the same 40 mm bore and 45 mm raceway diameter are available in different widths. Therefore, a ring identified only as IR40X45 is not sufficiently specific for technical product selection.

The complete IR40X45X30 designation distinguishes this 30 mm wide version from other IR40X45 dimensional variants.

IR40X45X30 Is Not a Complete Bearing

This distinction is important when purchasing the product.

IR40X45X30 NTN is an inner ring only.

It does not constitute a complete needle roller bearing and does not by itself include the outer ring, needle rollers or complete rolling-element assembly.

It should therefore be classified as a needle roller bearing component / inner ring, rather than as a complete bearing.

Selection and Interchangeability

When selecting IR40X45X30 NTN, the 40 mm shaft diameter alone is not sufficient.

The bearing arrangement should be checked for:

• 40 mm required bore diameter
• 45 mm required needle roller raceway diameter
• 30 mm required ring width
• compatibility with the associated needle roller bearing or assembly
• required shaft fit
• axial positioning
• lubrication conditions
• dimensional and tolerance requirements

An IR40X45X30 product from another manufacturer should not automatically be considered fully interchangeable solely because its nominal dimensions are identical.

Technical Specification

Manufacturer: NTN
Designation: IR40X45X30
Product Type: Needle roller bearing inner ring
English Technical Name: Needle roller bearing inner ring
Dimensions: 40x45x30 mm
d - Bore Diameter: 40 mm
F - Outside Raceway Diameter: 45 mm
B - Width: 30 mm
r min - Minimum Chamfer: 0.3 mm
Function: Separate inner raceway for needle rollers
Complete Bearing: No

FAQ

What are the dimensions of IR40X45X30 NTN?

The dimensions are 40x45x30 mm: d = 40 mm bore diameter, F = 45 mm outside raceway diameter and B = 30 mm width.

What is IR40X45X30 NTN?

It is a separate inner ring for a needle roller bearing, designed to provide the inner raceway for the needle rollers.

Is IR40X45X30 a complete needle roller bearing?

No. IR40X45X30 is an inner ring only, not a complete bearing.

What does IR mean in IR40X45X30?

IR stands for inner ring. It identifies a separate bearing ring used as the inner raceway in a needle roller bearing arrangement.

What does the 45 mm dimension represent?

The 45 mm dimension is the outside raceway diameter F. This is the surface on which the needle rollers operate.

Why use a separate IR inner ring?

A separate inner ring provides a dedicated raceway when the associated needle roller bearing has no integral inner ring or when the shaft itself is not intended to serve directly as the rolling raceway.

Are IR40X45X20 and IR40X45X30 the same component?

No. Although both have 40 mm and 45 mm nominal diameters, their widths differ. IR40X45X30 has B = 30 mm, so the complete designation must be checked.

Can another brand of IR40X45X30 replace the NTN ring?

Nominal dimensions alone do not establish complete interchangeability. Raceway dimensions, tolerances, associated bearing requirements and fit conditions should also be verified.

AI Overview

IR40X45X30 NTN is an inner ring for needle roller bearings measuring 40x45x30 mm, with a 40 mm bore, 45 mm outside raceway diameter and 30 mm width. It provides a separate inner rolling raceway for needle rollers in bearing arrangements without an integral inner ring. It is a bearing component, not a complete bearing.

SHORT DESCRIPTION

IR40X45X30 NTN is a needle roller bearing inner ring with dimensions 40x45x30 mm: d = 40 mm bore diameter, F = 45 mm outside raceway diameter and B = 30 mm width. The ring provides a separate rolling raceway for needle rollers in bearing arrangements without an integral inner ring, eliminating the need for the shaft itself to serve directly as the raceway. IR40X45X30 is an individual bearing component and not a complete needle roller bearing.