INA IR 40x48x40 Inner Ring

Main Description

The INA IR 40x48x40 inner ring is a precision-machined, hardened bearing component designed for use in needle roller bearings, especially where the shaft cannot serve as a raceway. With dimensions 40 mm (bore) x 48 mm (outer diameter) x 40 mm (width), this inner ring provides a highly durable running surface, ensuring stable and long-lasting operation in demanding industrial environments.

Manufactured by INA / Schaeffler, the IR series inner rings are known for exceptional dimensional accuracy, hardness, and resistance to wear. The high-quality bearing steel and optimized heat-treatment process increase load capacity and reduce surface fatigue, even under continuous operation. Its precisely ground raceway guarantees smooth rolling of needle rollers, significantly extending the lifetime of the entire bearing assembly.

The IR 40x48x40 ring is widely used in industrial applications, gearboxes, drive units, automation systems, and machine tool assemblies. When combined with needle roller cages or full complement needle rollers, it forms a compact, high-load-capacity bearing suitable for limited-space designs. The ring also features chamfered edges, which facilitate safe and damage-free mounting, both manually and using assembly tools.

This component is frequently used when the shaft is not hardened or requires replacement of the raceway. Thanks to its robust construction, the IR inner ring allows engineers to build reliable bearing units without costly shaft machining.

Technical Data

• Type: Inner ring for needle roller bearings

• Model: IR 40x48x40

• Manufacturer: INA / Schaeffler

• Bore (d): 40 mm

• Outer Diameter (D): 48 mm

• Width (B): 40 mm

• Material: Hardened bearing steel

• Raceway: Precision-ground

• Features: Chamfered edges for easier assembly

• Use: For needle roller cages or full complement needle rollers

FAQ

1. Is IR 40x48x40 a complete bearing?
No. It is an inner ring that acts as the raceway in a needle-roller bearing arrangement.

2. When do I need an inner ring like this?
When the shaft is not hardened or ground and cannot be used as a raceway.

3. What needle bearings can be used with this ring?
Any compatible needle roller cage or full complement needle roller assembly sized for a 40 mm shaft and 48 mm raceway.

4. Does the chamfer make installation easier?
Yes. Chamfered edges reduce the risk of roller damage and support safe mounting.

5. Is this ring suitable for high-load industrial applications?
Yes. Hardened bearing steel and ground raceway ensure long service life under heavy loads.