708 CD/P4ADBB
Miniature Super Precision Angular Contact Ball Bearings
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708 CD/P4ADBB Bearing Product Overview & Core Advantages
The 708 CD/P4ADBB is a metric duplex pair of precision angular contact ball bearings, specifically configured in a Back-to-Back (DB) arrangement. This preloaded set is designed to provide exceptional high rigidity and stability, making it ideal for applications requiring high running accuracy. Its primary advantage lies in its ability to withstand combined loads (radial and axial loads from both directions) simultaneously, ensuring reliable performance in demanding, high-precision environments.
708 CD/P4ADBB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 708 CD | Basic bearing designation. |
| P4A | Indicates a high precision tolerance class (superior to ABEC 7), ensuring minimal runout and vibration for ultra-precise applications. |
| DB | Specifies the Duplex Back-to-Back matched arrangement. This configuration provides high moment rigidity and can accommodate axial loads in both directions. |
| B | Denotes a Light preload applied to the bearing pair. This preload eliminates internal clearance, increases stiffness, and improves rotational accuracy. |
708 CD/P4ADBB Bearing Structural Features & Performance Benefits
Duplex Back-to-Back Design: The two bearings are mounted with their faces opposed. This structure creates a wide effective spread, significantly increasing the moment load capacity and operational stability of the spindle or shaft.
High Rigidity & Precision: The combination of the DB arrangement and a Light preload (Class B) results in a system with very high axial and radial rigidity. The P4A tolerance class guarantees exceptional running accuracy and low noise levels.
Optimized for High Speeds: The phenolic resin cage is lightweight and possesses excellent sliding properties, contributing to lower friction and enabling high-speed performance up to 110,000 rpm.
Superior Material & Lubrication: Manufactured from chrome steel for both rings and balls, ensuring high durability and fatigue life. The bearings come pre-lubricated for immediate use within the specified temperature range.
708 CD/P4ADBB Bearing Typical Application Areas
This high-precision, preloaded bearing set is ideally suited for applications where extreme accuracy, high speed, and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles (High-speed milling, grinding, and drilling)
- Precision Robotic Drives and Actuators
- High-Frequency Spindles for PCB drilling and routing
- Medical and Dental Handpieces
- Optical and Measuring Instrument Rotating Assemblies
