71920 CB/HCP4A
Hybrid Ceramic Super Precision Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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Product Overview and Core Advantages
The 71920 CB/HCP4A is a single-row angular contact ball bearing engineered for high-precision applications requiring exceptional rotational accuracy and speed capability. As a P4 (ABEC-7) tolerance class bearing, it guarantees minimal dimensional variation for superior performance. Its core advantage lies in its ability to accommodate combined loads, efficiently handling both radial and significant axial loads in one direction. The combination of a phenolic cage and ceramic balls makes it an ideal solution for demanding, high-speed environments where low friction, high rigidity, and thermal stability are paramount.
71920 CB/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Significance |
|---|---|---|
| 71920 | Basic bearing series and size designation | Indicates a 100mm bore, 140mm OD, 20mm width bearing. |
| CB | Specific internal design and contact angle | Denotes a 15° contact angle and optimized internal geometry for controlled axial play and high rigidity. |
| HC | Hybrid Ceramic | Signifies the use of ceramic balls (typically Silicon Nitride) with steel rings, reducing weight, friction, and heat generation. |
| P4 | Tolerance Class | Corresponds to ABEC-7, indicating ultra-precision dimensional and running accuracy. |
| A | Preload | Indicates that the bearing is supplied with a specific light preload to enhance system stiffness and rotational accuracy. |
Structural Features and Performance Benefits
Hybrid Ceramic Construction: The use of ceramic balls with chrome steel rings significantly reduces centrifugal forces, lowers operating temperature, and extends service life, especially at very high speeds. This construction also offers superior resistance to electrical erosion.
High-Speed Phenolic Cage: The phenolic resin cage is lightweight and possesses excellent sliding properties and dimensional stability under high centrifugal forces, contributing directly to the bearing's limiting speed of 24,000 rpm.
Precision and Rigidity: Manufactured to P4 tolerance and supplied with a light preload, this bearing delivers exceptional running accuracy, minimal vibration, and high system rigidity, which is critical for precise positioning applications.
Optimized Load Capacity: With a 15° contact angle, the 71920 CB/HCP4A is designed to support substantial axial loads in addition to radial loads, making it suitable for applications with combined loading conditions.
71920 CB/HCP4A Bearing Typical Application Areas
This precision angular contact bearing is ideally suited for high-performance machinery where speed, accuracy, and reliability are non-negotiable. Key application areas include:
- High-Frequency Machine Tool Spindles
- Precision Grinding Spindles
- High-Speed Robotic Drives and Actuators
- Advanced Aerospace and Defense Systems
- Turbocharger and Turbomachinery Shafts
