71917 ACD/P4AQBCD
71900 Series Super Precision Angular Contact Ball Bearings
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71917 ACD/P4AQBCD Bearing Product Overview & Core Advantages
The 71917 ACD/P4AQBCD is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional rigidity and load capacity. This quadruplex matched set in a back-to-back configuration (QBC) delivers superior system stability under combined loads (radial and axial). Manufactured to P4A tolerance class with a heavy preload (Class D), it ensures precise rotational accuracy and minimal runout, making it ideal for high-speed, high-rigidity spindles and other precision machinery.
71917 ACD/P4AQBCD Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| ACD | Angular Contact Design with a 25° contact angle, optimized for high axial load capacity. |
| P4A | High precision tolerance class exceeding ABEC 7, ensuring extremely tight dimensional and running accuracy. |
| QBC | Indicates the bearing is part of a Quadruplex Back-to-Back matched set. This arrangement provides maximum rigidity and moment load capacity. |
| D | Signifies a Heavy Preload applied to the bearing set, minimizing deflection under load for superior positional accuracy. |
71917 ACD/P4AQBCD Bearing Structural Features & Performance Benefits
- Exceptional Rigidity: The quadruplex back-to-back (QBC) arrangement creates a highly rigid bearing system that effectively resists moment loads and shaft deflection, crucial for maintaining precision in machining operations.
- Superior Load Capacity: The 25° contact angle and four-bearing stack provide a high dynamic and static load rating (25,650 lbf / 41,175 lbf), enabling reliable performance under significant combined radial and axial loads.
- Optimized High-Speed Performance: The lightweight phenolic cage reduces centrifugal forces, while the precision-ground chrome steel components and optimized internal geometry contribute to stable operation at high speeds, with a limiting speed of 28,000 rpm.
- Pre- Lubricated for Immediate Use: The bearing comes lubricated from the factory, ready for installation and initial operation, simplifying the assembly process.
71917 ACD/P4AQBCD Bearing Typical Application Areas
This bearing 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 Gearboxes: High-torque, low-backlash transmission systems.
- Industrial Pumps and Compressors: For handling high axial and radial forces.
- Robotic Drives and Rotary Tables: Where high positional accuracy and stiffness are required.
