7208 ACD/P4ADBB
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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7208 ACD/P4ADBB Bearing Product Overview & Core Advantages
The **7208 ACD/P4ADBB** is a **precision duplex angular contact ball bearing** set configured in a back-to-back (DB) arrangement. Engineered for applications demanding exceptional **rotational accuracy** and **high rigidity**, this matched pair excels at handling **combined radial and axial loads** simultaneously. Manufactured to **P4A tolerance class**, it delivers superior running precision and is pre-lubricated for immediate installation. The **light preload (Class B)** ensures optimal performance in high-speed operations while minimizing deflection under complex loading conditions.
7208 ACD/P4ADBB Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning | Performance Benefit |
|---|---|---|
| ACD | Angular Contact Duplex | Indicates a matched pair of angular contact bearings |
| P4A | High Precision Tolerance Class | Superior dimensional and running accuracy for precision applications |
| DB | Back-to-Back Arrangement | Provides high moment rigidity and stable operation under complex loads |
7208 ACD/P4ADBB Bearing Structural Features & Performance Benefits
Enhanced Rigidity & Load Capacity: The duplex back-to-back configuration creates a rigid bearing system that effectively resists moment loads and maintains shaft positioning accuracy. With a 25° contact angle and 14 high-precision chrome steel balls, the bearing delivers exceptional combined load capacity (Radial dynamic: 11,700 lbf / Static: 10,238 lbf).
Precision Engineering: Manufactured to P4A tolerance standards with tight dimensional controls (bore/OD tolerance: -0.004mm to 0), ensuring minimal runout and vibration. The phenolic resin cage provides excellent dimensional stability and reduced friction at high speeds (limiting speed: 41,000 rpm).
Optimized Performance: The light preload (Class B) eliminates internal clearance, enhancing rotational accuracy while maintaining smooth operation. Pre-lubricated design ensures immediate operation across a wide temperature range (-30°C to 110°C).
7208 ACD/P4ADBB Bearing Typical Application Areas
- Machine Tool Spindles - High-precision machining centers and grinding spindles
- Precision Gearboxes - Industrial transmission systems requiring accurate shaft positioning
- High-Speed Motors - Servo motors and spindle drives demanding minimal runout
- Robotic Systems - Precision joints and rotary axes in industrial automation
- Medical Equipment - Diagnostic imaging systems and surgical tool rotors
- Aerospace Components - Actuator systems and auxiliary power units
