R3A
R Series Miniature Bearings
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Basic Information
Main Dimensions
Inner Ring Dimensions
Ball & Washer Dimensions
Performance
Materials
Environment & Compliance
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R3A Bearing Product Overview & Core Advantages
The R3A inch-series ball bearing is a precision-engineered single row radial ball bearing designed for reliable performance in demanding applications. Manufactured to ABEC1 precision class, it delivers consistent operation and excellent value. Its compact design with a 0.1875" bore and 0.625" outside diameter provides a robust solution for high-speed applications, with a limiting speed of 38,000 rpm. The bearing is constructed from high-grade chrome steel for both rings and balls, ensuring durability and a long service life under substantial radial dynamic load capacity of 283 lbf.
R3A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Significance |
|---|---|
| R3A | Denotes the specific bearing series and size in the inch measurement system. |
| Open (Seal Type) | Indicates the bearing is unsealed, allowing for custom lubrication schemes and minimizing friction for high-speed operation. |
| MC3 | Specifies the radial internal clearance group (0.00008" to 0.0005"), optimized for general operating conditions. |
R3A Bearing Structural Features & Performance Benefits
Optimized Single Row Design: The bearing features a standard inner ring and a stainless steel cage that reliably retains the 8 precision balls, ensuring smooth rotation and stability at high velocities.
High-Speed Capability: The combination of the open design, low-friction cage, and MC3 internal clearance allows the bearing to achieve its high limiting speed, making it suitable for demanding rotational applications.
Robust Load Capacity: Engineered with a radial dynamic load rating of 283 lbf and a static load rating of 112 lbf, this bearing provides dependable support for various radial loads.
Wide Temperature Range: Constructed from chrome steel components, the bearing operates effectively within a broad temperature range from -86 to 230 °F.
R3A Bearing Typical Application Areas
- High-Speed Electric Motors and Spindles
- Precision Instruments and Medical Devices
- Small Industrial Pumps and Gearboxes
- Office Automation Equipment and Computer Fans
- Radio Control Models and Precision Mechanisms
