71911 CD/HCP4A
Hybrid Ceramic Super Precision Bearings
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71911 CD/HCP4A Bearing Product Overview & Core Advantages
The 71911 CD/HCP4A is a single-row angular contact ball bearing engineered for high-precision and high-speed applications. Its defining feature is the 15° contact angle, optimized to support significant combined loads—handling both radial and unidirectional axial loads simultaneously with high efficiency. Manufactured to the exacting P4 (ABEC-7) tolerance class, it guarantees exceptional running accuracy and rotational stability. The combination of a ceramic ball material and a phenolic cage contributes to reduced weight, lower friction, and superior performance at high rotational speeds, making it an ideal component for demanding, precision-driven machinery.
71911 CD/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71911 | The basic bearing designation, indicating a lightweight, high-precision series with a 55mm bore, 80mm outside diameter, and 13mm width. |
| C | Designates a 15° contact angle, optimized for high-speed operation and moderate axial load capacity. |
| D | Indicates the bearing is part of a matched set (Duplex) for preloaded arrangements, though this specific unit is supplied as a Single. |
| HC | Signifies the use of Hybrid Ceramic balls (Silicon Nitride), which provide benefits like electrical insulation, reduced weight, and superior high-speed capability. |
| P4 | Specifies the tolerance class equivalent to ABEC-7, ensuring extremely tight dimensional and running accuracy for precision applications. |
| A | Indicates that a specific preload is available for this bearing, allowing for optimized rigidity and minimal run-out in the assembled application. |
71911 CD/HCP4A Bearing Structural Features & Performance Benefits
High-Speed & High-Rigidity Performance: The 15° contact angle and hybrid ceramic ball design significantly reduce centrifugal forces and friction, enabling the bearing to achieve a high limiting speed of 30,000 rpm. The lightweight phenolic resin cage ensures excellent dimensional stability and guidance under high rotational stresses.
Superior Load Capacity: The angular contact design is inherently capable of supporting combined loads. With a dynamic load rating of 4388 lbf and a static load rating of 3285 lbf, it provides reliable performance in applications with significant radial and axial force components.
Precision & Longevity: Manufactured to P4 precision class with tight bore and outside diameter tolerances, this bearing ensures minimal vibration and high positional accuracy. The open seal type allows for customized lubrication schemes to further enhance service life and performance in controlled environments.
71911 CD/HCP4A Bearing Typical Application Areas
The 71911 CD/HCP4A is designed for high-performance machinery where speed, precision, and reliability are paramount. Its key application fields include:
- Machine Tool Spindles: For high-speed milling, grinding, and turning centers.
- Precision Robotics: In arm joints and spindle drives requiring high rigidity and accuracy.
- Aerospace & Defense Systems: In gyroscopes, navigation instruments, and auxiliary power units.
- High-Frequency Motors and Spindles: Used in PCB drilling, dental handpieces, and small precision motors.
