7213 CD/P4ADBB
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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7213 CD/P4ADBB Bearing Product Overview & Core Advantages
The 7213 CD/P4ADBB is a precision duplex angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. This back-to-back (DB) matched pair is preloaded to Light / Class B specifications, ensuring optimal performance under combined radial and axial loads. Manufactured to the stringent P4A tolerance class, it delivers superior running accuracy, high-speed capability, and reliable operation in precision machinery. Its compact design integrates two bearings into a single, highly rigid unit, making it ideal for high-precision spindles and other critical applications.
7213 CD/P4ADBB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7213 | Basic bearing series, indicating a 65mm bore, 120mm OD, and 46mm width. |
| C | Designates a 15° contact angle, optimized for high-speed operation and moderate axial loads. |
| D | Indicates the bearing is part of a duplex (matched pair) set. |
| P4A | Specifies the high-precision tolerance class, exceeding standard ABEC 7/ISO P4 levels for enhanced running accuracy. |
| DB | Specifies the Back-to-Back mounting arrangement, which provides high moment rigidity and excellent stability under complex loads. |
| B | Indicates the Light preload level (Class B), which minimizes deflection and ensures precise shaft positioning without excessive friction. |
7213 CD/P4ADBB Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The duplex back-to-back (DB) arrangement creates a highly rigid bearing system capable of withstanding significant combined radial and axial loads, as well as overturning moments. This configuration is essential for applications requiring minimal shaft deflection.
Precision & High-Speed Performance: Built to P4A tolerance class with a 15° contact angle and a lightweight phenolic resin cage, this bearing achieves a high limiting speed of 32,500 rpm. The precision-ground chrome steel components ensure smooth, quiet, and low-vibration operation.
Optimized for Performance: The bearings are supplied as a factory-matched set with a defined light preload, eliminating the need for complex preload adjustment during installation and guaranteeing immediate, consistent performance.
7213 CD/P4ADBB Bearing Typical Application Areas
The 7213 CD/P4ADBB is engineered for high-performance applications where precision, speed, and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Gearboxes: For robotics, aerospace, and high-end automotive systems.
- High-Frequency Motors and Spindles: Used in PCB drilling and precision engraving.
- Medical Equipment: Centrifuges and high-speed dental handpieces.
- Test and Measurement Equipment: Requiring ultra-precise rotational accuracy.
