708 CDGB/HCP4A
Hybrid Ceramic Super Precision Bearings
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708 CDGB/HCP4A Bearing Product Overview & Core Advantages
The 708 CDGB/HCP4A is a single-row angular contact ball bearing designed for high-precision applications requiring exceptional rotational accuracy and speed capability. Manufactured to ABEC 7 / P4A tolerance class, this bearing delivers superior running accuracy and dimensional stability. Its 15° contact angle is optimized for handling combined loads, effectively supporting both radial and axial loads in one direction. The ceramic ball construction significantly reduces centrifugal forces, enabling ultra-high speed operation up to 110,000 rpm while maintaining thermal stability across a wide temperature range (-30°C to 110°C).
708 CDGB/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Performance Benefit |
|---|---|---|
| 708 | Basic bearing series designation | Compact 8mm bore diameter with 22mm OD |
| CDGB | Universal Matchable (SU) bearing set | Precision matched for duplex arrangements |
| H | Ceramic balls (Silicon Nitride) | Reduced weight, higher stiffness, and thermal stability |
| C | 15° contact angle | Optimized for combined radial and axial loads |
| P4A | ABEC 7 / ISO P4A tolerance class | Ultra-precision running accuracy |
708 CDGB/HCP4A Bearing Structural Features & Performance Benefits
Hybrid Ceramic Construction: The combination of chrome steel rings with silicon nitride ceramic balls provides exceptional performance characteristics. Ceramic balls offer 40% lower density than steel, reducing centrifugal forces at high speeds and enabling the 110,000 rpm limiting speed. The ceramic-steel combination also provides superior electrical resistance and reduced thermal expansion.
Precision Phenolic Cage: The phenolic resin cage ensures smooth ball guidance and minimal friction at extreme speeds. This cage material provides excellent dimensional stability and operates effectively with minimal lubrication.
Light Preload (Class B): The bearing comes with controlled light preload which eliminates internal clearance, providing enhanced rigidity and precise rotational accuracy essential for high-speed spindles and precision applications.
Universal Matching Capability: Designed as Universal Matchable (SU) bearings, these units can be paired in various configurations (back-to-back, face-to-face, or tandem) to accommodate specific load and rigidity requirements in complex bearing arrangements.
708 CDGB/HCP4A Bearing Typical Application Areas
- High-Speed Machine Tool Spindles: CNC machining centers, grinding spindles, and precision milling applications requiring ultra-high rotational accuracy
- Precision Medical Equipment: Dental handpieces, surgical tools, and laboratory instrumentation demanding contamination-free operation
- Aerospace Components: Guidance systems, gyroscopes, and avionics requiring reliability across extreme temperature ranges
- Semiconductor Manufacturing: Wafer handling robots, precision positioning stages, and cleanroom equipment
- High-Frequency Motors: Servo motors, spindle motors, and other high-RPM electric motor applications
