71917 ACD/HCP4A
Hybrid Ceramic Super Precision Bearings
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71917 ACD/HCP4A Bearing Product Overview & Core Advantages
The 71917 ACD/HCP4A is a single-row angular contact ball bearing engineered for applications demanding high precision and superior performance. Its primary advantage lies in its ability to accommodate combined loads—significant radial and unidirectional axial loads—simultaneously. This is made possible by its specific 25° contact angle. Manufactured to the exacting P4 (ABEC-7) tolerance class, it is an ideal choice for high-speed spindles and other precision machinery requiring exceptional running accuracy and rigidity. The combination of a phenolic cage and ceramic balls contributes to its high-speed capability and reduced operational friction.
71917 ACD/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71917 | Basic bearing series and size designation (85mm bore, 120mm OD, 18mm width). |
| AC | Angular Contact design with a 25° contact angle. |
| D | Indicates a high rigid design and internal optimization. |
| HC | Signifies the use of Hybrid Ceramic balls (Silicon Nitride). |
| P4 | Specifies the P4 tolerance class (equivalent to ABEC-7), denoting ultra-high precision. |
| A | Indicates that the bearing is supplied with a specific preload for optimal stiffness. |
71917 ACD/HCP4A Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: The single-row angular contact design, combined with a P4 tolerance class and applied preload, ensures maximum system stiffness and minimal runout, which is critical for machining accuracy.
- Superior High-Speed Performance: The lightweight phenolic cage and low-density ceramic balls significantly reduce centrifugal forces, enabling a high limiting speed of 18,000 rpm. This hybrid construction also reduces heat generation.
- Enhanced Load Capacity: The 25° contact angle is optimized to handle substantial combined loads, providing excellent resistance to both radial and axial forces in one direction.
- Reduced Friction and Long Life: Ceramic balls are harder and smoother than steel, leading to lower friction, reduced wear, and extended service life, especially in high-speed applications.
- Standard Lubrication: The bearing is pre-lubricated for immediate use, suitable for a temperature range of -30°C to 110°C.
71917 ACD/HCP4A Bearing Typical Application Areas
- Machine Tool Spindles (CNC milling, grinding, and turning centers)
- High-Frequency Motors and Spindles
- Precision Robotics and Automation Equipment
- Aerospace and Defense Instrumentation
- Medical and Dental Equipment Spindles
