71917 CB/HCP4A
Hybrid Ceramic Super Precision Bearings
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71917 CB/HCP4A Bearing Product Overview & Core Advantages
The 71917 CB/HCP4A is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. Engineered with a 15° contact angle and P4 (ABEC-7) tolerance class, this bearing excels at accommodating combined loads—simultaneously handling significant radial loads and axial loads in one direction. Its ceramic ball construction and phenolic cage contribute to superior high-speed performance and reduced weight, making it an ideal solution for high-reliability, precision machinery where thermal stability and minimal vibration are critical.
71917 CB/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Benefit/Feature |
|---|---|---|
| 71917 | Basic bearing designation (85mm bore, 120mm OD, 18mm width) | Standard bearing dimensions for system integration |
| CB | Specific internal design and contact angle (15°) | Optimized for combined loads and precise axial positioning |
| HC | Hybrid Ceramic (Silicon Nitride balls) | Enhanced high-speed capability, reduced friction, and electrical insulation |
| P4 | Precision tolerance class (ABEC-7) | Ultra-precise running accuracy for precision bearing applications |
| A | Light preload | Increased rigidity and reduced vibration during operation |
71917 CB/HCP4A Bearing Structural Features & Performance Benefits
Hybrid Ceramic Construction: The use of ceramic balls significantly reduces centrifugal forces, lowers operating temperature, and enables higher limiting speeds (28,000 rpm) compared to all-steel equivalents. This construction also provides inherent electrical insulation.
Phenolic Resin Cage: The lightweight phenolic cage offers excellent dimensional stability at high speeds and provides superior guidance for the ceramic balls, contributing to smooth operation and extended service life.
Precision Ground Raceways: Manufactured to P4 tolerance with tight dimensional control on bore, outside diameter, and width, ensuring precise shaft and housing fits for optimal performance and high rigidity.
Optimized Load Capacity: The 15° contact angle is engineered to handle substantial combined loads, making it suitable for applications with significant axial and radial force components.
71917 CB/HCP4A Bearing Typical Application Areas
The 71917 CB/HCP4A is ideally suited for high-performance machinery where speed, precision, and reliability are paramount. Key industries and equipment include:
- High-Speed Machine Tool Spindles: For milling, grinding, and drilling centers requiring extreme accuracy and thermal stability.
- Precision Robotics: In robotic arm joints and actuators demanding high rigidity and responsiveness.
- Aerospace & Defense Systems: Gyroscopes, navigation systems, and other critical avionics components.
- Medical Equipment: High-speed dental handpieces and surgical drill spindles.
- Turbocharger Systems: Supporting shafts in high-RPM automotive and industrial turbochargers.
