7208 CD/P4ADBA
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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7208 CD/P4ADBA Bearing Product Overview & Core Advantages
The 7208 CD/P4ADBA is a duplex back-to-back angular contact ball bearing designed for applications demanding high precision and superior rigidity. Operating under the stringent P4A tolerance class, this matched pair is engineered to handle combined loads—significant radial loads alongside thrust loads in both directions. Its extra light preload (Class A) ensures minimal deflection and smooth operation, making it ideal for high-speed spindles and other precision machinery where accuracy and stability are paramount.
7208 CD/P4ADBA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7208 | Basic bearing series, indicating a 40mm bore, 80mm OD, and 36mm width. |
| C | 15° contact angle, optimized for carrying combined loads. |
| D | Indicates a duplex (two-bearing) configuration. |
| DB | Back-to-Back arrangement, providing high moment rigidity and excellent operational stability. |
| P4A | High precision tolerance class with enhanced dimensional and running accuracy requirements. |
| A | Specifies Extra Light Preload, minimizing friction and heat generation for high-speed applications. |
7208 CD/P4ADBA Bearing Structural Features & Performance Benefits
High Rigidity & Stability: The duplex back-to-back (DB) arrangement creates a wide, rigid support system that effectively resists moment loads and shaft deflection, ensuring exceptional positional accuracy.
Superior Load Capacity: The angular contact design with a 15° contact angle enables the bearing to efficiently support high radial dynamic load ratings of 12442 lbf and radial static load ratings of 10800 lbf, as well as bidirectional axial loads.
Optimized High-Speed Performance: The lightweight phenolic cage reduces centrifugal forces, while the extra light preload minimizes friction. This combination allows for a high limiting speed of 41,000 rpm, making it a true high-speed bearing.
Precision Engineering: Manufactured to P4A tolerance class with tight dimensional controls on the bore, outside diameter, and width, this bearing guarantees consistent, high-precision performance in the most demanding applications.
7208 CD/P4ADBA Bearing Typical Application Areas
The 7208 CD/P4ADBA is ideally suited for high-performance machinery requiring extreme precision and speed, including:
- Machine Tool Spindles (CNC machining centers, grinding spindles)
- High-Frequency Motors and Spindles
- Precision Gearboxes
- Robotic Drives and Rotary Axes
- Aerospace & Defense Positioning Systems
