71911 CD/HCPA9ADBB
Hybrid Ceramic Super Precision Bearings
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71911 CD/HCPA9ADBB Bearing Product Overview & Core Advantages
The 71911 CD/HCPA9ADBB is a precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. This duplex back-to-back (DB) matched set delivers superior performance under combined loads, effectively handling radial and axial forces simultaneously. Manufactured to an ultra-precise PA9A tolerance class and featuring a ceramic ball and phenolic cage construction, it is engineered for high-speed operation and extended service life in critical machinery.
71911 CD/HCPA9ADBB Bearing Model Code Explained, Specifications & Naming Convention
- 71911: Basic designation denoting a light series, 55mm bore angular contact bearing.
- C: Represents a 15° contact angle, optimized for high-speed applications with moderate axial load capacity.
- D: Indicates the bearing is part of a duplex pair.
- HC: Signifies the use of Hybrid Ceramic components (ceramic balls with steel rings).
- PA9A: Denotes an ultra-high precision tolerance class, ensuring minimal runout and vibration.
- DB: Specifies the Back-to-Back mounting arrangement, which provides high moment rigidity.
- B: Indicates a Light preload (Class B) is applied to the matched set, enhancing stiffness and rotational accuracy.
71911 CD/HCPA9ADBB Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The duplex back-to-back (DB) arrangement creates a wide, stable support system that significantly increases moment stiffness, making it ideal for applications subject to overturning moments. This configuration provides excellent capability for handling combined radial and axial loads.
High-Speed Performance: The combination of a lightweight phenolic resin cage and hybrid ceramic construction (silicon nitride balls) reduces centrifugal forces, lowers operating temperatures, and allows for a limiting speed of 34,000 rpm. The 15° contact angle is optimally balanced for rapid acceleration and deceleration.
Precision & Longevity: Manufactured to PA9A tolerance standards, this bearing ensures exceptional running accuracy. The ceramic balls are harder, lighter, and more resistant to wear and electrical erosion than steel, contributing to a longer operational life and consistent performance.
71911 CD/HCPA9ADBB Bearing Typical Application Areas
This high-precision, high-speed bearing set is typically specified for the most demanding applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and high-accuracy rotary axes.
- Aerospace & Defense Systems: Gyroscopes, radar platforms, and auxiliary power units.
- High-Frequency Motors and Spindles for the semiconductor and electronics manufacturing industries.
