71904 CD/HCP4ADBA
Hybrid Ceramic Super Precision Bearings
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71904 CD/HCP4ADBA Bearing Product Overview & Core Advantages
The 71904 CD/HCP4ADBA is a metric duplex angular contact ball bearing designed for high-precision applications requiring exceptional rotational accuracy and rigidity. This matched set of two bearings in a back-to-back (DB) arrangement is preloaded to Extra Light (Class A) specifications, ensuring minimal axial and radial play for superior system stability. Its construction with a phenolic cage and ceramic balls enables outstanding high-speed performance, making it an ideal solution for machine tool spindles and other demanding equipment where combination loads and thermal stability are critical.
71904 CD/HCP4ADBA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71904 | Basic bearing series and size designation. |
| C | 15° contact angle. |
| D | Duplex bearing (a matched set). |
| HC | Hybrid Ceramic: Signifies the use of ceramic balls. |
| P4A | Tolerance class P4A, indicating very high running accuracy. |
| DB | Back-to-Back mounting arrangement. |
| A | Extra light preload class. |
71904 CD/HCP4ADBA Bearing Structural Features & Performance Benefits
High Rigidity and Precision: The duplex back-to-back (DB) arrangement creates a wide, rigid support system that effectively resists moment loads, ensuring exceptional positional accuracy and system stability under combination loads.
Superior High-Speed Capability: The combination of a lightweight phenolic cage and low-density, hard ceramic balls significantly reduces centrifugal forces, allowing for a very high limiting speed of 75,000 rpm. This hybrid construction also minimizes heat generation.
Enhanced Load Capacity: The angular contact design with a 15° contact angle is optimized to handle combined radial and axial loads simultaneously, providing reliable performance in demanding applications.
Pre-Lubricated for Immediate Use: The bearing is supplied lubricated, ready for installation and immediate operation within its specified temperature range.
71904 CD/HCP4ADBA Bearing Typical Application Areas
This high-precision, high-speed bearing is engineered for advanced applications, including:
- Machine Tool Spindles (High-speed milling, grinding, and turning centers)
- Precision Robotics and Automation Arms
- High-Frequency Spindle Motors
- Medical and Dental Drill Handpieces
- Aerospace Instrumentation and Gyroscopes
