71917 ACEGA/HCP4AL
Hybrid Ceramic Super Precision Bearings
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71917 ACEGA/HCP4AL Bearing Product Overview & Core Advantages
The 71917 ACEGA/HCP4AL is a single-row angular contact ball bearing engineered for applications demanding ultra-high precision and exceptional performance. Positioned in the P4A super-precision tolerance class, it is designed to handle significant axial loads in one direction and moderate radial loads simultaneously. Its core advantages stem from its ceramic ball material and phenolic resin cage, which contribute to lower friction, higher limiting speeds, and superior performance in demanding conditions. This bearing is universally matchable (SU), allowing for precise preload control when mounted in pairs, making it ideal for high-rigidity, high-speed spindle applications.
71917 ACEGA/HCP4AL Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Significance |
|---|---|---|
| 71917 | Basic bearing series and size designation | Indicates a metric, 85mm bore, 120mm OD, 18mm width bearing. |
| AC | Angular Contact design | Optimized for combined radial and axial loads. |
| EGA | Contact angle and preload designation | Specifies a 25° contact angle and Extra Light (Class A) preload. |
| HC | Hybrid Ceramic | Indicates the use of ceramic balls, offering reduced weight, lower thermal expansion, and higher speed capability. |
| P4A | Tolerance Class | Denotes super-precision dimensional and running accuracy, superior to ABEC 7/ISO P4. |
71917 ACEGA/HCP4AL Bearing Structural Features & Performance Benefits
Hybrid Ceramic Construction: The use of silicon nitride (Si3N4) ceramic balls significantly reduces centrifugal forces, lowers operating temperature, and enables a limiting speed of 28,000 rpm. This makes it an ideal high-speed bearing solution.
Phenolic Resin Cage: The lightweight and robust phenolic cage provides excellent dimensional stability and guidance at high speeds, contributing to smooth operation and extended service life.
High Load Capacity: With a 25° contact angle and precision-ground raceways, this bearing delivers a high dynamic load rating of 6322 lbf and static load rating of 4860 lbf, ensuring reliable performance under combined loads.
Universal Matchability (SU): This feature allows for flexible mounting arrangements. When two bearings are mounted as a universal pair, they provide optimized axial and radial rigidity and precise preload setting, which is critical for machine tool spindles.
Precision Tolerances: The P4A tolerance class and tight bore/OD tolerances ensure minimal runout and vibration, which is essential for achieving superior surface finishes and machining accuracy.
71917 ACEGA/HCP4AL Bearing Typical Application Areas
The 71917 ACEGA/HCP4AL is specifically designed for high-performance machinery where precision, speed, and reliability are paramount. Key application areas include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and high-accuracy positioning systems.
- Aerospace Equipment: Gyroscopes, navigation systems, and auxiliary power units.
- Medical Devices: High-speed dental handpieces and surgical drill spindles.
- Advanced Pumps and Compressors: For handling high rotational speeds with minimal vibration.
