71913 ACD/HCP4A
Hybrid Ceramic Super Precision Bearings
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71913 ACD/HCP4A Bearing Product Overview & Core Advantages
The 71913 ACD/HCP4A is a single-row angular contact ball bearing engineered for high-precision applications requiring exceptional rotational accuracy and rigidity. Designed to accommodate primarily axial loads in one direction and combined loads, this bearing features a 25° contact angle for optimal thrust capacity. Its P4 (ABEC-7) tolerance class ensures superior running accuracy, making it ideal for high-speed spindles and precision machinery. The combination of a phenolic cage and ceramic balls contributes to reduced weight, lower friction, and enhanced high-speed performance.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 71913 | Basic bearing series and size designation (65mm bore, 90mm OD, 13mm width) |
| AC | Angular Contact design with a 25° contact angle |
| D | High load capacity internal design |
| HC | Hybrid Ceramic: Features ceramic balls for enhanced performance |
| P4 | P4 tolerance class (ABEC-7), indicating very high precision |
| A | Optimized internal geometry for high-speed operation |
71913 ACD/HCP4A Bearing Structural Features & Performance Benefits
- High Rigidity & Precision: The single-row angular contact design, manufactured to P4 tolerance, provides exceptional dimensional stability and running accuracy, crucial for applications demanding minimal runout.
- Enhanced Speed & Performance: The phenolic resin cage offers excellent strength-to-weight ratio and guidance, while the ceramic (Si3N4) balls reduce centrifugal forces, lower operating temperatures, and enable a limiting speed of 24,000 rpm. This makes it a true high-speed bearing.
- Superior Load Capacity: The 25° contact angle and optimized raceway geometry are designed to handle significant axial loads in one direction and combined (radial and axial) loads efficiently.
- Preload & Matched Sets: The bearing is supplied with a preload, increasing system stiffness and positioning accuracy. It is typically used in matched arrangements (back-to-back or face-to-face) to accommodate bidirectional axial loads.
71913 ACD/HCP4A Bearing Typical Application Areas
The 71913 ACD/HCP4A is specified for high-performance machinery where precision, speed, and reliability are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and high-accuracy rotary axes.
- Medical Equipment: Dental handpieces, centrifuges, and imaging scanners.
- Aerospace & Defense: Gyroscopes, radar systems, and auxiliary power units (APUs).
- High-Frequency Motors and Spindles: For PCB drilling, semiconductor manufacturing, and small precision tools.
