71906 ACB/HCP4A
Hybrid Ceramic Super Precision Bearings
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Basic Information
Main Dimensions
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71906 ACB/HCP4A Bearing Product Overview & Core Advantages
The 71906 ACB/HCP4A is a high-precision angular contact ball bearing designed for applications demanding exceptional accuracy and performance. This single bearing features a 25° contact angle and is supplied with a preload, enabling it to handle combined loads (simultaneous radial and axial loads) with high rigidity and rotational accuracy. Its construction with ceramic balls and a phenolic cage contributes to superior high-speed performance, reduced weight, and extended service life, making it ideal for high-reliability, high-RPM applications.
71906 ACB/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71906 | Basic bearing series and size designation (30mm bore, 47mm OD, 9mm width). |
| ACB | Angular Contact Bearing with a 25° contact angle. |
| H | Indicates the use of ceramic balls (Hybrid Ceramic). |
| C | Refers to the phenolic (composite) cage material. |
| P4 | Specifies the tolerance class P4 (ABEC-7), denoting very high running accuracy. |
| A | Indicates the bearing is supplied with a preload for enhanced rigidity. |
71906 ACB/HCP4A Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: The angular contact design and applied preload minimize axial and radial play, providing exceptional stiffness and precise shaft positioning, crucial for high-precision machinery.
- Superior High-Speed Capability: The combination of a lightweight phenolic cage and low-density, hard ceramic balls reduces centrifugal forces, enabling a high limiting speed of 67,000 rpm. This also results in lower operating temperatures.
- Enhanced Load Capacity: The 25° contact angle is optimized to handle significant axial loads in one direction while also supporting substantial radial loads, making it suitable for combined load applications.
- Extended Service Life: Ceramic balls are harder and more wear-resistant than steel, and they are electrically insulating, reducing the risk of electrical erosion. This leads to a longer operational lifespan, especially in demanding environments.
71906 ACB/HCP4A Bearing Typical Application Areas
This high-performance bearing is engineered for advanced applications where speed, precision, and reliability are paramount. Key industries and equipment include:
- High-Frequency Machine Tool Spindles
- Precision Grinding Spindles
- High-Speed Motors and Drives
- Aerospace Actuators and Control Systems
- Semiconductor Manufacturing Equipment
