7211 ACD/P4ADBC
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
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Materials
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7211 ACD/P4ADBC Bearing Product Overview & Core Advantages
The 7211 ACD/P4ADBC is a precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. This duplex back-to-back (DB) arrangement is preloaded to provide high rigidity and superior stability under combined loads, including significant radial and axial forces. Manufactured to the stringent P4A tolerance class, it ensures minimal runout and consistent performance in high-precision machinery. Its phenolic cage and optimized geometry contribute to excellent high-speed capabilities, making it an ideal choice for spindles and other critical rotating components.
7211 ACD/P4ADBC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7211 | Basic bearing series, indicating a metric bore diameter of 55 mm, outside diameter of 100 mm, and width of 42 mm. |
| AC | Angular Contact design with a 25° contact angle for handling combined radial and axial loads. |
| D | Duplex Back-to-Back (DB) matched arrangement. Two bearings are supplied as a pre-mounted set. |
| P4A | High precision tolerance class, specifying extremely tight dimensional and running accuracy tolerances. |
| DBC | Specifies a moderate preload (Class C) applied to the duplex set for optimal rigidity and performance. |
7211 ACD/P4ADBC Bearing Structural Features & Performance Benefits
The performance of the 7211 ACD/P4ADBC is derived from its sophisticated design and material selection:
- High Rigidity & Stability: The duplex back-to-back configuration with a defined preload creates a rigid bearing system that effectively resists moment loads and shaft deflection, ensuring precise shaft positioning.
- Superior Load Capacity: The 25° contact angle and robust construction enable it to handle significant combined radial and axial loads simultaneously, with a dynamic load rating of 19,170 lbf and a static load rating of 18,338 lbf.
- Optimized High-Speed Performance: The lightweight phenolic cage reduces centrifugal forces, while the open design allows for efficient lubrication management, supporting a high limiting speed of 34,000 rpm.
- Precision & Longevity: Manufactured from high-grade chrome steel for rings and balls, and held to P4A tolerances, this bearing guarantees low vibration, minimal heat generation, and extended service life in precision applications.
7211 ACD/P4ADBC Bearing Typical Application Areas
The 7211 ACD/P4ADBC 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 and Pumps.
- Industrial Robotics: Arm joints and rotary actuators.
- Medical Equipment: High-speed dental handpieces and imaging devices.
- Aerospace Actuation Systems and test equipment.
