708 CD/P4ADBC
Miniature Super Precision Angular Contact Ball Bearings
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708 CD/P4ADBC Bearing Product Overview & Core Advantages
The 708 CD/P4ADBC is a precision duplex angular contact ball bearing set designed for applications demanding exceptional rotational accuracy and rigidity. This metric bearing features a Back-to-Back (DB) matched arrangement and a P4A super-precision tolerance class, making it ideal for high-speed spindles and other precision machinery. Its core advantages include the ability to handle combined loads (radial and axial), high operational stability due to its duplex configuration, and superior performance enabled by its phenolic cage and precision-ground components.
708 CD/P4ADBC Bearing Model Code Explained, Specifications & Naming Convention
| 708 | Basic bearing series and size designation. |
| CD | Indicates a duplex bearing set with a moderate preload (Class C) applied in a Back-to-Back (DB) arrangement. This configuration provides high rigidity and moment load capacity. |
| P4A | Denotes an ABEC 7 / ISO P4A super-precision tolerance class. This ensures extremely tight dimensional and running accuracy for applications requiring minimal runout and vibration. |
| DB | Confirms the Back-to-Back (DB) matched arrangement of the two bearings in the set. |
708 CD/P4ADBC Bearing Structural Features & Performance Benefits
High Rigidity and Stability: The duplex Back-to-Back (DB) design significantly increases system rigidity, providing excellent resistance to moment loads and ensuring stable shaft positioning under combined loads.
Optimized for High-Speed Operation: The lightweight phenolic resin cage reduces centrifugal forces, minimizes friction, and contributes to the high limiting speed of 110,000 rpm. The 15° contact angle offers a balanced capability for radial and axial loads at high speeds.
Precision Performance: Manufactured to P4A tolerance standards with a bore diameter of 8 mm and an outside diameter of 22 mm, this bearing guarantees exceptional running accuracy and low noise levels, which is critical for precision bearing applications.
Pre-Lubricated for Immediate Use: The bearing comes lubricated from the factory, ensuring optimal performance from the start of operation within its specified temperature range.
708 CD/P4ADBC Bearing Typical Application Areas
The 708 CD/P4ADBC is engineered for high-performance applications where precision and speed are paramount. Key industries and equipment include:
- High-Frequency Spindles for PCB drilling and precision machining
- Precision Machine Tool main shafts and ball screws
- High-Speed Motors and encoders
- Medical and Dental Handpieces
- Aerospace Instrumentation and control systems
