7212 CD/P4ADBB
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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7212 CD/P4ADBB Bearing Product Overview & Core Advantages
The 7212 CD/P4ADBB is a precision duplex angular contact ball bearing designed for applications demanding exceptional rotational accuracy and high rigidity. This back-to-back (DB) matched set is preloaded to Light / Class B specifications, enabling it to handle combined loads—significant radial and axial loads from both directions—simultaneously. Manufactured to the exacting P4A tolerance class, it is the ideal solution for high-speed spindles and other high-precision machinery where minimal runout and maximum system stability are critical.
7212 CD/P4ADBB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Significance |
|---|---|---|
| 7212 | Basic bearing series and size designation (60mm bore, 110mm OD). | Defines the core bearing dimensions. |
| C | 15° contact angle. | Optimized for carrying axial loads and achieving high limiting speeds. |
| D | Duplex (Two single bearings as a set). | Enables the bearing to handle moment loads and increases system stiffness. |
| P4A | Tolerance class (High Precision). | Guarantees extremely tight dimensional and running accuracy for superior performance. |
| DB | Back-to-Back arrangement. | Provides a wide effective spread, offering high moment stiffness and excellent stability under combined loads. |
| B | Light Preload. | Reduces axial and radial play, enhancing rigidity and positioning accuracy without excessive heat generation. |
7212 CD/P4ADBB Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The back-to-back duplex design creates a rigid, statically determinate bearing system. This configuration provides excellent resistance to overturning moments and can support substantial combined radial and axial loads from both directions, making it exceptionally stable under complex loading conditions.
Optimized High-Speed Performance: The phenolic resin cage is lightweight and possesses excellent sliding properties, which is crucial for reducing centrifugal forces and friction at the high limiting speed of 36,000 rpm. The standard lubrication further supports reliable operation at these elevated speeds.
Precision Engineering: Manufactured to P4A tolerance class with a narrow bore and outside diameter tolerance band, this bearing ensures minimal runout and precise shaft positioning. The use of high-grade chrome steel for rings and balls ensures durability and long service life.
7212 CD/P4ADBB Bearing Typical Application Areas
The 7212 CD/P4ADBB is engineered for the most demanding high-precision and high-speed applications, including:
- Machine Tool Spindles: For CNC machining centers, grinding spindles, and milling heads where high rigidity and accuracy are paramount.
- High-Frequency Motors & Spindles: Used in applications requiring very high rotational speeds.
- Precision Rotary Tables & Indexers: Ensuring accurate angular positioning and repeatability.
- Aerospace & Defense Systems: In gyroscopes, radar equipment, and other critical positioning systems.
