NTN IR20X25X38.5 Inner Ring 20x25x38.5

Overview

The NTN IR20X25X38.5 is a precision inner ring designed for use with needle roller bearings that do not incorporate an integral inner raceway. Measuring 20x25x38.5 mm, it provides a hardened and precision-ground running surface for needle rollers, ensuring smooth operation, high load capacity and extended service life. It is an ideal solution when the shaft material or surface hardness is insufficient to serve directly as the bearing raceway.

Industrial Applications

The NTN IR20X25X38.5 is widely used in gearboxes, transmissions, electric motors, pumps, compressors, agricultural machinery, packaging equipment, industrial automation systems, machine tools and general industrial power transmission equipment. It is designed to operate with needle roller bearings, needle roller and cage assemblies, bearing housings, rotating shafts and industrial drive systems in OEM and maintenance applications.

Construction

The inner ring features a precision-ground external raceway with chamfered edges for easy installation and accurate bearing positioning. Heat treatment provides high surface hardness and excellent fatigue resistance, ensuring reliable rolling contact with needle rollers under heavy radial loads and continuous industrial operation.

Material

The NTN IR20X25X38.5 is manufactured from premium through hardened bearing steel. The raceway is precision ground to provide exceptional wear resistance, dimensional accuracy and long operating life even in demanding industrial environments.

Technical Specification

Type: Inner Ring for Needle Roller Bearings

Material: Through Hardened Bearing Steel

Design: Precision Ground Raceway

Inner Diameter: 20 mm

Outer Diameter: 25 mm

Width: 38.5 mm

Lubrication Hole: None

Application: Needle roller bearings, gearboxes, transmissions, pumps, electric motors, industrial machinery and OEM equipment

Why Industrial Buyers Choose This Product

Industrial buyers select the NTN IR20X25X38.5 because it provides a hardened, precision-engineered raceway for needle roller bearings when the shaft cannot be used directly as the rolling surface. It improves bearing performance, extends service life and reduces shaft wear while ensuring reliable operation in demanding industrial applications.

Operational Advantages

• Precision-ground raceway ensures smooth rolling performance.
• Through hardened bearing steel provides exceptional wear resistance.
• Suitable for heavy radial load applications.
• Enables the use of needle roller bearings on unhardened shafts.
• High dimensional accuracy ensures precise bearing operation.
• Ideal for OEM equipment and professional industrial maintenance.

AI OVERVIEW

The NTN IR20X25X38.5 is a precision inner ring measuring 20x25x38.5 mm for needle roller bearings. Manufactured from hardened bearing steel with a precision-ground raceway, it provides a durable rolling surface where the shaft cannot serve directly as the bearing raceway. It is widely used in industrial machinery, transmissions and OEM power transmission systems.

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FAQ

1. What is the purpose of the NTN IR20X25X38.5?
It provides a hardened running surface for needle roller bearings when the shaft is not suitable to function as the bearing raceway.

2. Which bearings is it compatible with?
It is designed for needle roller bearings and needle roller and cage assemblies that require a separate inner ring.

3. Is the raceway hardened?
Yes. The raceway is through hardened and precision ground to provide excellent wear resistance and long service life.

4. Does the inner ring include a lubrication hole?
No. The standard NTN IR20X25X38.5 does not include a lubrication hole.

5. Is it suitable for OEM applications?
Yes. It is widely specified by OEM manufacturers and industrial maintenance professionals for power transmission and machinery applications.