7208 ACD/P4ADBA
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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7208 ACD/P4ADBA Bearing Product Overview & Core Advantages
The 7208 ACD/P4ADBA is a precision duplex angular contact ball bearing designed for applications requiring exceptional rotational accuracy and rigidity. This P4A tolerance class bearing features a back-to-back (DB) matched arrangement, providing superior stability and the ability to handle combined loads (radial and axial) simultaneously. Its extra light preload (Class A) minimizes deflection under operational stresses, making it ideal for high-speed spindles and other high-precision machinery where maximum rigidity and running accuracy are critical.
7208 ACD/P4ADBA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7208 | Basic bearing series; 40 mm bore, 80 mm OD, 36 mm width. |
| AC | Angular Contact design with a 25° contact angle. |
| D | Duplex (two bearings supplied as a matched set). |
| P4A | High Precision Tolerance Class (exceeds ABEC-7), ensuring extremely tight dimensional and running accuracy. |
| DB | Back-to-Back Arrangement. This configuration provides high moment rigidity and effective compensation for axial loads from both directions. |
| A | Extra Light Preload (Class A), which minimizes friction and heat generation while maintaining high system stiffness. |
7208 ACD/P4ADBA Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The duplex back-to-back (DB) arrangement creates a wide effective spread, significantly increasing the bearing's resistance to moment loads and enhancing overall system stiffness.
- Superior Load Capacity: The 25° contact angle and optimized internal geometry allow the bearing to support substantial combined radial and axial loads efficiently.
- Precision & High-Speed Performance: Manufactured to P4A tolerance class with a lightweight phenolic resin cage, this bearing ensures smooth operation, reduced vibration, and is capable of achieving a limiting speed of 41,000 rpm.
- Optimized Material Selection: Constructed from high-grade chrome steel for both rings and balls, ensuring long-term durability and performance under demanding conditions.
- Pre-lubricated for Immediate Use: The bearing is factory-lubricated, ready for installation and initial operation, simplifying the assembly process.
7208 ACD/P4ADBA Bearing Typical Application Areas
The 7208 ACD/P4ADBA is engineered for high-performance applications where precision and rigidity are non-negotiable. Key industries and machinery include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Gearboxes: Robotics and high-accuracy transmission systems.
- High-Frequency Motors and Spindles: Applications requiring minimal runout and high rotational accuracy.
- Medical and Laboratory Equipment: Centrifuges and precision scanners.
- Aerospace Actuation Systems: Control surface mechanisms and other critical flight components.
