71900 CD/HCP4ADT
Hybrid Ceramic Super Precision Bearings
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Main Dimensions
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71900 CD/HCP4ADT Bearing Product Overview & Core Advantages
The 71900 CD/HCP4ADT is a super-precision angular contact ball bearing designed for the most demanding high-speed and high-rigidity applications. This duplex tandem (DT) matched set is preloaded and manufactured to an exceptional P4A tolerance class, ensuring ultra-low runout and extreme rotational accuracy. Its core advantage lies in its ability to handle combined loads with superior performance, making it an ideal choice for advanced machinery requiring maximum stiffness and speed.
Model Code In-Depth Analysis
| Code Segment | Technical Meaning |
|---|---|
| 71900 | Basic bearing series, indicating a super-precision, light-series angular contact bearing. |
| C | 15° contact angle, optimized for high-speed operation. |
| D | Indicates a duplex (two-bearing) set. |
| HC | Hybrid Ceramic: Features ceramic balls and steel rings for reduced friction, lower heat generation, and higher speed capability. |
| P4A | The highest tolerance class, specifying extremely tight dimensional and running accuracy limits superior to ABEC 7/ISO P4. |
| DT | Duplex Tandem arrangement. The two bearings are mounted in tandem to increase axial load capacity in one direction. |
71900 CD/HCP4ADT Bearing Structural Features & Performance Benefits
Hybrid Ceramic Construction: The combination of chrome steel rings and silicon nitride (Si3N4) ceramic balls significantly reduces centrifugal forces, lowers operating temperature, and extends bearing life, especially at very high speeds. This is a key feature for high-speed spindles.
Phenolic Resin Cage: The lightweight and robust phenolic cage ensures excellent guidance and stability of the ceramic balls at ultra-high rotational speeds, contributing to the impressive limiting speed of 165,000 rpm.
Duplex Tandem Preload: The set is supplied as a factory-matched and preloaded DT pair. This configuration provides maximum axial rigidity and precise shaft positioning, eliminating the need for complex preload adjustment during installation.
Super-Precision P4A Tolerances: Manufactured to the strictest P4A tolerance class, this bearing guarantees minimal vibration and exceptional running accuracy, which is critical for achieving superior surface finishes in machining applications.
71900 CD/HCP4ADT Bearing Typical Application Areas
- High-Frequency CNC Spindles for PCB drilling and precision milling
- High-Speed Machine Tool Spindles
- Precision Grinding Spindles
- Dental and Medical Handpiece Drives
- Turbocharger shafts and other very high-speed instrumentation
