71911 CD/P4ADBB
71900 Series Super Precision Angular Contact Ball Bearings
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71911 CD/P4ADBB Bearing Product Overview & Core Advantages
The 71911 CD/P4ADBB 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 is preloaded to Light / Class B specifications, ensuring optimal stiffness and minimal axial/radial runout right from installation. Its primary advantage lies in its ability to handle combined loads—significant radial loads alongside thrust loads in both directions—making it ideal for high-precision spindles and machinery. Manufactured to the stringent P4A tolerance class, it guarantees superior running accuracy and consistent performance in high-speed operations.
71911 CD/P4ADBB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71911 | Basic bearing designation, indicating a high-precision angular contact bearing series with a 55 mm bore, 80 mm OD, and 26 mm width. |
| C | Specifies a 15° contact angle, optimized for high-speed performance and moderate axial load capacity. |
| D | Indicates the bearing is part of a duplex (paired) set. |
| P4A | Denotes an ultra-precision tolerance class exceeding ABEC 7 standards, ensuring minimal dimensional and running inaccuracies. |
| DB | Specifies the Duplex Back-to-Back arrangement. This configuration provides high moment rigidity and excellent stability under complex loading conditions. |
| B | Indicates the Light preload applied to the matched set, which minimizes deflection and improves system rigidity. |
71911 CD/P4ADBB Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The duplex back-to-back (DB) arrangement creates a wide, rigid support system that effectively resists moment loads and shaft deflection, which is critical for maintaining precision in machine tool spindles.
- Superior Precision: Manufactured to P4A tolerance class with a phenolic resin cage, this bearing ensures extremely low vibration and noise levels, contributing to superior surface finishes in machining operations.
- Optimized High-Speed Performance: The 15° contact angle and lightweight phenolic cage are engineered for reduced centrifugal forces and lower operating temperatures, enabling a high limiting speed of 34,000 rpm.
- Robust Load Capacity: With a dynamic load rating of 7020 lbf and static load rating of 6525 lbf, the bearing is capable of sustaining significant combined radial and axial loads.
- Premium Material Construction: The rings and balls are made from high-grade chrome steel, providing excellent wear resistance and long service life under demanding conditions.
71911 CD/P4ADBB Bearing Typical Application Areas
The 71911 CD/P4ADBB is engineered for high-performance applications where precision, speed, and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Rotary Systems: CNC indexing heads, rotary tables, and robotic arm joints.
- High-Frequency Motors: Spindles for PCB drilling and high-speed electric motors.
- Medical & Laboratory Equipment: Centrifuges and precision analytical instruments.
- Aerospace & Defense Systems: Gyroscopes, radar platforms, and guidance systems.
