SKF IR 140X155X35 140x155x35 - Needle Bearing Inner Ring

SKF IR 140X155X35 140x155x35 mm - Needle Roller Bearing Inner Ring

SKF IR 140X155X35 is a precision inner ring for needle roller bearings, manufactured by SKF, with dimensions of 140x155x35 mm. It belongs to the SKF IR series and provides a hardened and ground raceway for needle rollers. This component is used when the shaft surface cannot serve directly as a rolling raceway. It is a separate bearing component, not a complete bearing, and contains no rolling elements or cage.

Technical Specifications - SKF IR 140X155X35

The dimensional data, chamfer and mass correspond to the SKF IR inner ring catalogue specifications.

Important: The 155 mm dimension represents the inner ring raceway diameter F, not the outside diameter of a complete bearing. Dynamic load ratings, static load ratings and limiting speeds must be determined for the correctly selected complete bearing assembly rather than the inner ring alone.

What Does SKF IR 140X155X35 Mean?

The designation IR 140X155X35 consists of the SKF inner ring series designation followed by three nominal dimensions.

IR - Inner Ring Series

IR identifies SKF's standard series of inner rings designed primarily for use with needle roller bearings.

These rings provide a suitable rolling contact surface in applications where the shaft itself cannot be used directly as a raceway.

140 - Bore Diameter d

The nominal bore diameter is 140 mm.

This is the diameter of the surface intended to be mounted on the shaft.

155 - Raceway Diameter F

The external raceway diameter is 155 mm.

This is the surface on which the needle rollers operate in the assembled bearing arrangement.

35 - Ring Width B

The nominal width of the inner ring is 35 mm.

Therefore, SKF IR 140X155X35 identifies an inner ring with dimensions of 140x155x35 mm.

Construction of SKF IR 140X155X35

Hardened and Ground Raceway

The most important functional feature of the IR inner ring is its external rolling raceway.

During operation, the needle rollers of the mating bearing run directly on this surface.

The raceway must provide suitable hardness, dimensional accuracy, geometric precision and surface finish.

These characteristics affect contact stress distribution and the operating life of the bearing assembly.

SKF IR 140X155X35 provides a ready-made rolling raceway for a correctly matched needle roller bearing.

140 mm Bore

The ring has a nominal bore diameter of 140 mm.

The shaft fit must be selected according to the applied loads, loading conditions and operating requirements.

The influence of the selected fit on the operating clearance of the complete bearing assembly must also be considered.

155 mm Raceway Diameter

The nominal raceway diameter is 155 mm.

This dimension must match the requirements of the mating needle roller bearing or needle roller assembly.

It must not be confused with the outside diameter of a complete bearing.

35 mm Width

The inner ring has a nominal width of 35 mm.

When selecting a mating bearing, verify the working width, axial guidance requirements and any permitted axial displacement between the inner ring and the rolling element assembly.

Chamfer Dimensions

The minimum catalogue chamfer dimension is 1.1 mm.

The shaft shoulder geometry must be designed to prevent interference between the shaft fillet and the inner ring chamfer.

How Does SKF IR 140X155X35 Work?

Some needle roller bearings are designed to operate without a separate inner ring.

In these arrangements, the needle rollers run directly on a suitably prepared shaft surface.

However, the shaft must meet strict requirements concerning hardness, dimensional accuracy, roundness and surface finish.

If these requirements cannot be achieved, a separate inner ring can be used.

SKF IR 140X155X35 provides a hardened and ground raceway with a nominal diameter of 155 mm.

The needle rollers of the correctly selected bearing operate on this surface instead of directly on the shaft.

This arrangement separates the requirements of the rolling raceway from the structural requirements of the shaft itself.

It can also simplify maintenance when the raceway becomes worn or damaged.

SKF IR 140X155X35 vs a Shaft Used Directly as a Raceway

The appropriate solution depends on the mechanical design.

A separate inner ring is not required in every needle roller bearing application, but it can provide practical advantages in manufacturing, assembly and maintenance.

SKF IR 140X155X35 vs Other Inner Ring Variants

SKF IR 140X155X35 vs SKF IR 140X160X50

Both components belong to the SKF IR inner ring series, but their dimensions differ.

Although both rings have the same nominal bore diameter, they differ in raceway diameter and width.

They are not directly interchangeable.

SKF IR Series vs SKF LR Series

SKF also manufactures inner rings in the LR series.

IR and LR rings differ in their manufacturing characteristics and raceway accuracy requirements.

When considering replacement, check the relevant tolerances, geometric accuracy and compatibility with the specific needle roller bearing.

Nominal dimensions alone are not sufficient to establish interchangeability.

Alternative Designations and Search References

Natural written variations of the same product include:

• SKF IR 140X155X35

• IR 140X155X35 SKF

• IR140X155X35 SKF

• SKF IR 140x155x35

• IR 140x155x35

Differences in letter case or spacing do not necessarily indicate different products.

Inner rings from other manufacturers with dimensions of 140x155x35 mm may be considered as potential alternatives, provided that their tolerances, raceway characteristics and technical specifications are compatible.

No unverified OEM or cross-reference numbers are assigned to this product.

Bearing Selection and Interchangeability

Before purchasing SKF IR 140X155X35, verify the following technical requirements.

1. Shaft Diameter

The nominal bore diameter is 140 mm.

The shaft fit must be selected according to the application requirements.

2. Raceway Diameter

The external raceway diameter is 155 mm.

It must match the specified raceway diameter required by the mating needle roller bearing.

3. Inner Ring Width

The width is 35 mm.

This dimension must be checked against the mating bearing width and the axial guidance arrangement.

4. Operating Clearance

The internal clearance of the complete bearing assembly depends on the selected components, their manufacturing tolerances and the mounting fits.

The inner ring itself does not have an independent internal clearance class equivalent to that of a complete rolling bearing.

5. Load Capacity and Rotational Speed

Load ratings and permissible operating speeds must be determined from the specifications of the complete bearing assembly.

These parameters should not be assigned independently to the inner ring.

6. Raceway Accuracy

Check the required raceway tolerances and surface quality, particularly in applications where geometric accuracy is critical.

7. Lubrication and Operating Conditions

Consider the lubricant, operating temperature, contamination level and sealing arrangement of the complete bearing assembly.

8. Manufacturer Compatibility

An inner ring from another manufacturer with identical nominal dimensions is not automatically a technically equivalent replacement.

Raceway tolerances, hardness, surface finish and mounting requirements must also be considered.

Applications of SKF IR 140X155X35

SKF IR series inner rings are designed for use with appropriately selected needle roller bearings.

They are particularly useful when the shaft cannot provide a suitable rolling raceway directly.

Typical applications for this type of component include industrial bearing assemblies, rotating mechanical systems and equipment requiring a separate hardened and ground raceway.

The suitability of SKF IR 140X155X35 for a particular machine depends on the mating bearing, shaft design, operating loads and mounting conditions.

The designation should not be associated with specific machine models or OEM applications without verified technical documentation.

Installation and Maintenance

Cleanliness Before Assembly

Clean the shaft, inner ring and surrounding components before installation.

Contamination or foreign particles can affect the mounting fit and damage the raceway.

Correct Shaft Fit

Check the shaft dimensions, surface condition and specified fit before mounting the ring.

The fit must be suitable for the loading conditions and bearing arrangement.

Applying Mounting Force

Apply mounting force evenly to the inner ring.

Avoid misalignment, excessive force and direct impact on the precision-ground raceway.

Protecting the Raceway

The external raceway must remain free from scratches, dents and corrosion.

Even localized damage can affect the operation of the needle rollers.

Axial Location

After installation, verify the axial positioning of the inner ring and its compatibility with the mating bearing assembly.

Lubrication

Lubrication must be selected according to the requirements of the mating needle roller bearing and the complete mechanical system.

Storage

Store the inner ring in a clean, dry environment.

Protect it against moisture, corrosion and mechanical damage.

Frequently Asked Questions - SKF IR 140X155X35

What are the dimensions of SKF IR 140X155X35?

The inner ring has a bore diameter of 140 mm, raceway diameter of 155 mm and width of 35 mm. Its nominal dimensions are 140x155x35 mm.

Is SKF IR 140X155X35 a complete needle roller bearing?

No. It is a separate inner ring intended for use with a compatible needle roller bearing assembly. It does not include needle rollers, a cage or an outer ring.

What does IR mean in the SKF designation?

IR identifies SKF's standard inner ring series for needle roller bearing applications.

Is 155 mm the outside diameter of the complete bearing?

No. It is the external raceway diameter of the inner ring. The outside diameter of the complete bearing depends on the other components in the assembly.

How much does SKF IR 140X155X35 weigh?

Its approximate catalogue mass is 0.92 kg.

Does SKF IR 140X155X35 have a dynamic load rating?

A separate inner ring is not assigned a dynamic load rating in the same way as a complete rolling bearing. The relevant load rating must be obtained from the specifications of the complete needle roller bearing assembly.

Does SKF IR 140X155X35 require lubrication?

Yes. The raceway must be adequately lubricated when operating with needle rollers. The lubricant and lubrication method depend on the complete bearing arrangement.

Can an inner ring from another manufacturer with the same dimensions be used?

A replacement may be possible after verifying dimensional tolerances, raceway accuracy, material characteristics and mounting requirements. Identical nominal dimensions alone do not guarantee full interchangeability.

SKF IR 140X155X35 - Key Technical Information

SKF IR 140X155X35 is a separate inner ring for needle roller bearings, with dimensions of 140x155x35 mm. It belongs to the SKF IR series and provides a hardened, ground raceway with a diameter of 155 mm. Its approximate catalogue mass is 0.92 kg. The component contains no rolling elements or cage and requires a compatible needle roller bearing assembly.

SKF IR 140X155X35 at simmering.pl

SKF IR 140X155X35 can be identified and ordered by its complete manufacturer designation through simmering.pl.

Based in Lublin, Poland, simmering.pl supplies industrial bearings, bearing components and sealing solutions to maintenance departments, engineering teams, technical purchasing departments and international B2B customers.

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