7211 CD/P4ADFC
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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7211 CD/P4ADFC Bearing Product Overview & Core Advantages
The 7211 CD/P4ADFC is a precision angular contact ball bearing designed for demanding applications requiring high rotational accuracy and rigidity. This duplex face-to-face (DF) arrangement consists of two matched bearings preloaded to Moderate / Class C, delivering exceptional system stability. Its primary advantage lies in its ability to handle combined loads—significant radial loads alongside bidirectional axial loads—making it ideal for high-speed, high-precision machinery where high rigidity and precise shaft positioning are critical.
7211 CD/P4ADFC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7211 | Basic bearing series, indicating a 55 mm bore, 100 mm OD, and 42 mm width. |
| C | Specifies a 15° contact angle, optimized for handling combined loads. |
| D | Indicates a duplex face-to-face (DF) matched bearing arrangement. |
| P4A | Denotes a high-precision tolerance class (superior to ABEC 7), ensuring minimal runout and vibration. |
| DFC | Specifies the Moderate / Class C preload applied to the duplex set for optimal rigidity and performance. |
7211 CD/P4ADFC Bearing Structural Features & Performance Benefits
High Rigidity & System Stability: The duplex face-to-face (DF) arrangement with Class C preload creates a highly rigid bearing system that minimizes axial and radial deflection under load, crucial for maintaining precision in machine tools and spindles.
Superior Load Capacity: The 15° contact angle and duplex design enable the bearing to support substantial combined radial and bidirectional axial loads simultaneously. With a dynamic load rating of 20,340 lbf and a static load rating of 19,125 lbf, it offers reliable performance in strenuous conditions.
High-Speed Capability: The use of a lightweight, durable phenolic cage reduces centrifugal forces, allowing for a high limiting speed of 34,000 rpm. This makes it an excellent high-speed bearing solution.
Precision & Accuracy: Manufactured to P4A tolerance class with tight dimensional controls on the bore diameter, outside diameter, and width, this bearing ensures smooth, quiet operation with minimal runout, which is vital for applications requiring high rotational accuracy.
7211 CD/P4ADFC Bearing Typical Application Areas
- Machine Tool Spindles: High-precision milling, grinding, and turning centers where rigidity and speed are paramount.
- High-Speed Machining Centers: Applications demanding exceptional accuracy and the ability to handle complex loads at high rotational speeds.
- Precision Grinding Spindles: Where minimal vibration and runout are critical for achieving superior surface finishes.
- Industrial Pumps & Compressors: For shafts requiring robust support against combined radial and axial forces.
