7210 ACD/P4ADGB
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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Product Overview and Core Advantages
The 7210 ACD/P4ADGB is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. As a universal matchable (SU) bearing, it can be paired with another identical bearing in various configurations to handle combined radial and axial loads simultaneously. Manufactured to P4A tolerance class, it offers superior dimensional and running accuracy, making it ideal for high-speed spindles and other precision machinery where minimal runout and vibration are critical. Its light preload (Class B) ensures consistent performance and extended service life under rigorous operating conditions.
7210 ACD/P4ADGB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7210 | Basic bearing designation indicating a 50mm bore, 90mm OD, and 40mm width. |
| ACD | Angular Contact design with a 25° contact angle for optimal axial load capacity. |
| P4A | Indicates a high-precision tolerance class exceeding ABEC 7 standards, ensuring superior running accuracy. |
| DGB | Universal Matchable (SU) designation, meaning two bearings can be paired in any combination (back-to-back, face-to-face, or tandem) to suit specific load requirements. |
Structural Features and Performance Benefits
High Rigidity and Load Capacity: The angular contact design with a 25° contact angle enables the bearing to efficiently support significant combined radial and axial loads. When universally matched, the bearing set provides enhanced system rigidity and stability.
High-Speed Performance: The lightweight phenolic cage minimizes centrifugal forces, reduces friction, and contributes to a high limiting speed of 46,000 rpm. This makes it suitable for very high-speed applications.
Precision Engineering: Manufactured to P4A tolerance class with tight dimensional controls on the bore, outside diameter, and width, this bearing guarantees precise shaft positioning and smooth, quiet operation.
Optimized Internal Geometry: With 15 precision balls of 12.7mm diameter, the bearing is engineered for balanced load distribution and reduced stress concentrations, contributing to its high dynamic and static load ratings.
7210 ACD/P4ADGB Bearing Typical Application Areas
The 7210 ACD/P4ADGB is ideally suited for high-performance machinery where precision and speed are paramount. Key application areas include:
- Machine Tool Spindles: For CNC machining centers, grinders, and lathes requiring high rigidity and running accuracy.
- High-Speed Motors and Spindles: Used in applications pushing rotational limits, such as in aerospace and semiconductor manufacturing equipment.
- Precision Instrumentation: Critical for medical devices, optical scanners, and measuring equipment where minimal vibration is essential.
- Robotics and Automation: Provides reliable, precise motion control in robotic arm joints and high-precision rotary tables.
