NSK RNA4910 Needle Roller Bearing with Inner Ring – 50 × 72 × 22mm | Heavy Duty Industrial Bearing
NSK RNA4910 Needle Roller Bearing with Inner Ring – 50 × 72 × 22mm | Heavy Duty Industrial Bearing
Product Description
The NSK RNA4910 Needle Roller Bearing with Inner Ring is a high-quality, precision-engineered industrial bearing designed to support heavy radial loads while providing smooth rotation, excellent durability and reliable performance in demanding mechanical applications.
Featuring precision cylindrical needle rollers, a robust outer ring and a separate removable inner ring, this bearing delivers excellent load-carrying capacity within a compact, space-saving construction.
The included inner ring provides a hardened and precision-ground running surface for the needle rollers, making this bearing assembly suitable for applications where the shaft cannot be used directly as a bearing raceway.
Ideal for industrial machinery, gearboxes, conveyor systems, CNC equipment, agricultural machinery, industrial automation and mechanical transmission systems.
Key Features
-
NSK Quality: Precision-engineered bearing designed for demanding industrial applications.
-
Inner Ring Included: Supplied with a compatible removable inner ring for convenient installation and maintenance.
-
High Radial Load Capacity: Designed to support significant radial loads in industrial equipment.
-
Compact Construction: Provides excellent load capacity while minimising installation space.
-
Precision Needle Rollers: Ensure efficient load distribution and smooth rotational movement.
-
Durable Bearing Steel: Designed for strength, wear resistance and long service life.
-
Removable Inner Ring: Provides a hardened running surface and greater installation flexibility.
-
Industrial Performance: Suitable for rotating shafts, mechanical transmissions and automation equipment.
Technical Specifications
| Specification | Details |
|---|---|
| Brand | NSK |
| Bearing Model | RNA4910 with Inner Ring |
| Complete Assembly Equivalent | NA4910 |
| Bearing Type | Needle Roller Bearing |
| Inner Diameter (with ring) | 50 mm |
| Outer Diameter | 72 mm |
| Bearing Width | 22 mm |
| Roller-Inscribed Diameter (without ring) | 58 mm |
| Inner Ring | Included – Removable |
| Roller Arrangement | Single Row |
| Material | Bearing Steel |
| Seal Type | Open / Unsealed |
| Lubrication | Grease or Oil |
| Primary Load Direction | Radial |
| Basic Dynamic Load Rating | 42.5 kN |
| Basic Static Load Rating | 73.5 kN |
| Catalogue Limiting Speed (Oil) | 7,100 rpm |
| Approximate Weight (with ring) | 295 g |
Load ratings and limiting speed are based on the NSK catalogue. Actual operating limits depend on lubrication, installation and application conditions.
Common Applications
The NSK RNA4910 Needle Roller Bearing with Inner Ring is suitable for various industrial and mechanical applications, including:
-
Industrial Machinery: Manufacturing equipment, production machinery and rotating mechanical assemblies.
-
Gearboxes and Transmissions: Supports rotating shafts and gear assemblies subjected to radial loads.
-
Conveyor Systems: Suitable for mechanical drives, material handling machinery and industrial conveying equipment.
-
CNC Machinery: Used in compatible machine mechanisms and rotating equipment.
-
Agricultural Equipment: Suitable for mechanical assemblies in agricultural machinery.
-
Automotive Applications: Used in compatible transmission and mechanical systems.
-
Industrial Automation: Suitable for automated machinery, manufacturing equipment and mechanical drive mechanisms.
-
Maintenance and Repairs: Replacement bearing for compatible industrial equipment.
Benefits of Needle Roller Bearings
Needle roller bearings use long, slender cylindrical rollers that provide a large contact area between the rolling elements and bearing raceways.
This construction allows needle roller bearings to support substantial radial loads while maintaining a compact cross-section.
Main advantages include:
-
High radial load-carrying capacity
-
Compact and space-saving construction
-
Smooth and efficient rotational movement
-
Reduced friction with proper lubrication
-
Excellent durability under suitable operating conditions
-
Suitable for demanding industrial machinery
-
Convenient maintenance with a removable inner ring
Installation and Maintenance Recommendations
-
Verify shaft diameter, housing dimensions and bearing compatibility before installation.
-
Ensure mounting surfaces are clean, correctly machined and free from damage.
-
Use suitable bearing installation tools and appropriate fitting procedures.
-
Apply the recommended grease or oil according to the operating conditions.
-
Avoid excessive misalignment, contamination and improper loading.
-
Inspect bearings periodically for wear, overheating, vibration and unusual noise.
-
Follow the manufacturer's specified load, speed and lubrication requirements.
Important Product Information
RNA4910 – Without Inner Ring
-
Roller-Inscribed Diameter: 58 mm
-
Outer Diameter: 72 mm
-
Width: 22 mm
NA4910 – With Inner Ring
-
Inner Diameter: 50 mm
-
Outer Diameter: 72 mm
-
Width: 22 mm
This product is described as an NSK RNA4910 supplied with a compatible removable inner ring, corresponding dimensionally to an NA4910 bearing assembly.
Please confirm the bearing marking, supplied inner ring and dimensional compatibility before ordering.
Learn More – Watch Our Bearing Educational Video
Want to learn more about needle roller bearings, how they work and where they are used?
Watch our educational video from RM Engineering & Automation, where we explain different types of industrial bearings, their working principles, common applications and important factors when selecting bearings for machinery.
In this video, you can learn about:
-
Different types of industrial bearings
-
How needle roller bearings work
-
Ball bearings versus roller bearings
-
Common industrial bearing applications
-
How bearings reduce friction and support rotating shafts
-
Important considerations when selecting bearings
-
Bearing maintenance and common causes of failure
Watch Our Bearing Educational Video on YouTube
https://www.youtube.com/watch?v=G-B4zJTEwAk&t=5s
Subscribe to RM Engineering & Automation on YouTube for educational videos covering mechanical engineering, industrial automation, bearings, electric motors, sensors, conveyors, robotics and industrial machinery.
Contact RM Engineering & Automation
For more information about our needle roller bearings, industrial components, mechanical parts or automation solutions, please contact us.
RM Engineering & Automation
Website: https://www.rmengineeringautomation.com.au/
Email: info@rmenga.com.au
We supply a wide range of industrial bearings, mechanical components and automation products for manufacturing, maintenance, engineering and industrial applications.