NSK RNA4909 Needle Roller Bearing with Inner Ring – 45 × 68 × 22mm | Heavy Duty Industrial Bearing
NSK RNA4909 Needle Roller Bearing with Inner Ring – 45 × 68 × 22mm | Heavy Duty Industrial Bearing
Product Description
The NSK RNA4909 Needle Roller Bearing with Inner Ring is a precision-engineered industrial bearing designed to provide high radial load capacity, smooth rotation and reliable performance in demanding mechanical applications.
Featuring precision cylindrical needle rollers, a durable outer ring and a separate removable inner ring, this heavy-duty bearing offers excellent load-carrying capacity within a compact, space-saving design.
The included inner ring provides a hardened and precision-ground running surface for the needle rollers, making the 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, automation systems and mechanical transmission applications.
Key Features
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NSK Quality: Precision-engineered bearing for industrial applications.
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Inner Ring Included: Supplied with a separate compatible removable inner ring.
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High Radial Load Capacity: Designed to support heavy radial loads in demanding environments.
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Compact Construction: Excellent load capacity within limited installation space.
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Precision Needle Rollers: Provide smooth rotation and efficient load distribution.
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Durable Bearing Steel: Designed for strength, wear resistance and long service life.
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Removable Inner Ring: Allows convenient installation and maintenance.
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Industrial Performance: Suitable for mechanical drives, rotating shafts and industrial equipment.
Technical Specifications
| Specification | Details |
|---|---|
| Brand | NSK |
| Bearing Model | RNA4909 with Inner Ring |
| Complete Assembly Equivalent | NA4909 |
| Bearing Type | Needle Roller Bearing |
| Inner Diameter (with ring) | 45 mm |
| Outer Diameter | 68 mm |
| Bearing Width | 22 mm |
| Roller-Inscribed Diameter (without ring) | 52 mm |
| Inner Ring | Included – Removable |
| Roller Arrangement | Single Row |
| Material | Bearing Steel |
| Seal Type | Open / Unsealed |
| Lubrication | Grease or Oil |
| Primary Load Direction | Radial |
Common Applications
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Industrial Machinery: Manufacturing equipment, production machinery and rotating assemblies.
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Gearboxes and Transmissions: Supports rotating shafts and gear assemblies under radial loads.
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Conveyor Systems: Suitable for conveyor drives, material handling machinery and mechanical equipment.
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CNC Machinery: Used in compatible rotating mechanisms and industrial machinery.
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Agricultural Equipment: Suitable for selected agricultural machinery and mechanical assemblies.
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Automotive Applications: Used in compatible transmission and mechanical systems.
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Industrial Automation: Suitable for automated manufacturing machinery and drive mechanisms.
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Maintenance and Repairs: Replacement bearing for compatible industrial equipment.
Benefits of Needle Roller Bearings
Needle roller bearings utilise long, slender cylindrical rollers that provide a large contact area between the rolling elements and bearing raceways.
Their compact construction allows them to support significant radial loads without requiring excessive installation space.
Main advantages include:
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High radial load-carrying capacity
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Compact, space-saving design
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Smooth and efficient rotational movement
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Reduced friction with correct lubrication
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Durable performance under suitable operating conditions
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Suitable for demanding industrial environments
Installation and Maintenance Recommendations
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Verify shaft diameter, housing dimensions and bearing compatibility before installation.
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Ensure mounting surfaces are clean and free from damage.
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Use suitable bearing installation tools and correct fitting procedures.
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Apply appropriate grease or oil according to the operating conditions.
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Avoid excessive misalignment, contamination and improper loading.
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Inspect bearings periodically for wear, overheating, vibration and unusual noise.
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Follow the manufacturer's recommended operating limits and maintenance requirements.
Important Product Information
RNA4909 – Without Inner Ring
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Roller-Inscribed Diameter: 52 mm
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Outer Diameter: 68 mm
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Width: 22 mm
NA4909 – With Inner Ring
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Inner Diameter: 45 mm
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Outer Diameter: 68 mm
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Width: 22 mm
This product is described as an NSK RNA4909 supplied with a compatible removable inner ring, corresponding dimensionally to an NA4909 bearing assembly.
Please confirm the bearing marking, inner-ring compatibility and supplied components 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, applications and how to select the correct bearing for your machinery.
In this video, you can learn about:
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Different types of industrial bearings
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How needle roller bearings work
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Ball bearings versus roller bearings
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Common industrial bearing applications
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How bearings reduce friction and support rotating shafts
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Important factors when selecting bearings
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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, 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.