7211 ACD/P4ADFA
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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7211 ACD/P4ADFA Bearing Product Overview & Core Advantages
The 7211 ACD/P4ADFA is a precision duplex angular contact ball bearing specifically designed for applications requiring exceptional rotational accuracy and rigidity. This P4A tolerance class bearing features a face-to-face (DF) matched arrangement, providing superior stability and the ability to handle combined radial and axial loads from both directions. With its extra light preload (Class A) and phenolic cage, it is optimized for high-speed operation and demanding applications where high rigidity and precise shaft positioning are critical.
7211 ACD/P4ADFA Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| AC | Angular Contact design with a 25° contact angle. |
| D | Duplex arrangement (two bearings supplied as a set). |
| P4A | High precision tolerance class (exceeding ABEC 7), ensuring minimal runout and superior running accuracy. |
| DF | Face-to-Face mounting arrangement. This configuration provides high moment stiffness and accommodates axial loads from both directions. |
| A | Specifies an extra light preload applied to the matched set, minimizing friction and heat generation at high speeds. |
7211 ACD/P4ADFA Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The duplex face-to-face (DF) design creates a highly rigid bearing system capable of withstanding significant combined loads and moments. This configuration is essential for applications requiring precise shaft location and minimal deflection under load.
Optimized High-Speed Performance: The lightweight phenolic resin cage reduces centrifugal forces, while the extra light preload minimizes friction and heat buildup, enabling a high limiting speed of 34,000 rpm.
Precision Engineering: Manufactured to P4A tolerance class with tight dimensional control on the bore diameter (55 mm), outside diameter (100 mm), and width (42 mm), this bearing guarantees exceptional running accuracy and consistency.
Durable Construction: Components made from chrome steel provide high fatigue life and durability under demanding operating conditions.
7211 ACD/P4ADFA Bearing Typical Application Areas
- Machine Tool Spindles: High-speed milling, grinding, and turning centers requiring extreme precision and rigidity.
- Precision Gearboxes: Applications where low noise, high speed, and accurate shaft alignment are paramount.
- High-Frequency Spindles: PCB drilling, precision engraving, and other high-RPM machining operations.
- Medical Equipment: Centrifuges and high-speed dental handpieces.
- Robotics: Precision joints and actuators demanding high stiffness and rotational accuracy.
