IKO RNA4904

IKO RNA 4904 Needle Roller Bearing

Description

The IKO RNA 4904 is a high-precision machined needle roller bearing without an inner ring. This design is ideal for applications where the shaft is hardened and ground, serving as the inner raceway. It provides high rigidity and a high load capacity within a very small radial space. Manufactured in Japan, this bearing ensures excellent quality and performance for demanding industrial applications.

Specifications

• Manufacturer: IKO
• Type: RNA 4904
• Inner Diameter (d): 25 mm
• Outer Diameter (D): 37 mm
• Width (C): 17 mm
• Cage Material: Steel
• Seals: No, open design
• Inner Ring: Not included
• Lubrication: Features a lubrication hole and groove in the outer ring

Label Info

• Brand: IKO
• Origin: JAPAN
• Model: RNA4904

Application

This bearing is suitable for a wide range of applications, including but not limited to machine tools, planetary gears, automotive and motorcycle transmissions, and industrial pumps where radial space is limited but high load-bearing capacity is required.

Country of Origin

This product is manufactured in Japan.

CO2 Impact

By purchasing this pre-owned bearing, you are helping to avoid the emission of approximately 0.11 kg of CO2. This is equivalent to the energy needed to charge a standard smartphone more than 13 times. A small choice for your machine can make a big difference for the planet.

Availability

This item is in stock and ready for immediate dispatch. Order now from spareparts2day for expert support and fast delivery.

FAQ

What shaft hardness is recommended for use with this RNA 4904 bearing?

For optimal performance and bearing life, the shaft (which serves as the inner raceway) should be hardened to 58-64 HRC and ground to a high surface finish.

Does the lubrication hole in the outer ring require a specific grease type?

The choice of grease depends on the application’s speed, load, and temperature. A high-quality lithium-based grease is generally suitable for standard conditions, but always consult your machine’s maintenance manual for specific requirements.

Can this bearing operate in high-temperature environments?

The standard IKO RNA 4904 with a steel cage is typically rated for continuous operation up to 120 deg C (250 deg F). For higher temperatures, special heat treatment and lubricants may be required.

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Current Date: Friday, March 13, 2026