71813 CD/P2DBA
71800 Series Super Precision Angular Contact Ball Bearings
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71813 CD/P2DBA Bearing Product Overview & Core Advantages
The 71813 CD/P2DBA is a precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. This metric bearing features a duplex back-to-back (DB) arrangement with an extra light preload (Class A), making it ideal for supporting combined loads—simultaneously handling radial forces and axial loads from both directions. Its P2 tolerance class ensures ultra-precise running characteristics, while the phenolic cage contributes to stable high-speed operation. This configuration offers a compact, high-performance solution for spindles and other precision machinery.
71813 CD/P2DBA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71813 | Basic bearing designation indicating the size series and bore diameter (65 mm). |
| C | Designates a 15° contact angle, optimized for high-speed applications with moderate axial load capacity. |
| D | Indicates the bearing is part of a duplex pair (two bearings supplied as a set). |
| P2 | Specifies the high precision tolerance class, ensuring minimal runout and superior dimensional accuracy. |
| DB | Denotes the back-to-back mounting arrangement, which provides high moment rigidity and maintains precise shaft positioning. |
| A | Signifies an extra light preload for minimal friction and optimal high-speed performance. |
71813 CD/P2DBA Bearing Structural Features & Performance Benefits
High Rigidity & Precision: The duplex back-to-back (DB) arrangement creates a rigid bearing system that effectively resists moment loads and maintains precise shaft alignment, which is critical for machine tool spindles. The P2 tolerance class guarantees exceptional dimensional precision and running accuracy.
Optimized Load Capacity: With a 15° contact angle, this bearing is engineered to handle combined radial and axial loads efficiently. The back-to-back configuration enables it to support axial loads from both directions, while the radial dynamic load rating of 4972 lbf ensures reliable performance under demanding conditions.
Superior High-Speed Performance: The phenolic cage offers excellent dimensional stability and low friction at high rotational speeds, contributing to the bearing's limiting speed of 36,000 rpm. The light preload minimizes heat generation, further enhancing high-speed capability.
Material Excellence: Manufactured from chrome steel for both rings and balls, this bearing delivers high hardness, wear resistance, and long service life under precision operating conditions.
71813 CD/P2DBA Bearing Typical Application Areas
The 71813 CD/P2DBA is specifically designed for high-precision, high-speed applications where accuracy and rigidity are paramount:
- Machine Tool Spindles: CNC machining centers, grinding spindles, and milling spindles
- Precision Instrumentation: Measuring equipment, optical instruments, and coordinate measuring machines
- High-Speed Rotary Systems: Dental handpieces, small precision motors, and laboratory equipment
- Robotics: Precision joints and high-accuracy positioning systems
