7208 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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7208 ACD/P4ADGB Bearing Product Overview & Core Advantages
The 7208 ACD/P4ADGB is a high-precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. As a universally matchable (SU) bearing supplied in a pre-loaded pair, it is engineered to accommodate combined loads—simultaneously handling significant radial and axial forces. Its P4A tolerance class and light preload (Class B) ensure smooth, quiet operation at high speeds, making it ideal for high-performance spindles and precision machinery where reliability is critical.
7208 ACD/P4ADGB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7208 | Basic bearing series, indicating a 40 mm bore, 80 mm OD. |
| AC | Angular Contact design with a 25° contact angle. |
| D | Signifies two bearings in a universally matchable (SU) set. |
| P4A | High-Precision Tolerance Class, providing extremely tight dimensional and running accuracy. |
| DGB | Universal Match (DU) arrangement, back-to-back (DB) mounting. The bearings are supplied as a pre-loaded pair. |
7208 ACD/P4ADGB Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The double-row angular contact design and universal matching create a highly rigid bearing system capable of supporting substantial combined radial and axial loads from both directions.
Superior High-Speed Performance: The lightweight phenolic resin cage minimizes centrifugal forces, while the optimized internal geometry and 25° contact angle contribute to a high limiting speed of 41,000 rpm.
Exceptional Precision: Manufactured to P4A tolerance class with a light preload, this bearing ensures minimal runout and vibration, which is critical for maintaining machining and positioning accuracy.
Optimized Material Selection: Constructed from chrome steel for both rings and balls, the bearing offers high durability and fatigue resistance under demanding operating conditions.
7208 ACD/P4ADGB Bearing Typical Application Areas
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and rotary actuators requiring high rigidity and accuracy.
- High-Frequency Motors & Spindles: Applications where minimal vibration at high RPM is essential.
- Medical Equipment: Dental handpieces and imaging scanner gantries.
- Aerospace & Defense Systems: Gyroscopes, radar platforms, and other precision instrumentation.
