71913 ACB/HCP4ADT
Hybrid Ceramic Super Precision Bearings
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71913 ACB/HCP4ADT Bearing Product Overview & Core Advantages
The 71913 ACB/HCP4ADT is a precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and performance. This duplex tandem (DT) matched set features two bearings preloaded against each other, delivering superior high rigidity and axial load capacity in one direction. Manufactured to an ultra-precise P4A tolerance class and utilizing ceramic balls, it is engineered for high-speed operation, reduced friction, and extended service life in critical machinery.
71913 ACB/HCP4ADT Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71913 | Basic bearing series and size designation (65mm bore, 90mm OD). |
| ACB | Angular Contact Bearing with a 25° contact angle. |
| HCP4A | Indicates a P4A tolerance class (higher than ABEC 7) and a phenolic (Polyamide) cage for high-speed capability. |
| DT | Duplex Tandem arrangement. Two bearings are mounted in tandem to maximize axial load capacity in one direction. |
71913 ACB/HCP4ADT Bearing Structural Features & Performance Benefits
- High Rigidity & Axial Stiffness: The duplex tandem (DT) arrangement with applied preload creates a highly rigid bearing system, minimizing axial deflection under load for exceptional positional accuracy.
- Superior High-Speed Performance: The combination of a lightweight phenolic cage and low-density ceramic (Si3N4) balls reduces centrifugal forces, enabling a high limiting speed of 36,000 rpm.
- Reduced Friction and Heat Generation: Ceramic balls have a lower coefficient of thermal expansion and are harder than steel, leading to less friction, lower operating temperatures, and potentially longer lubrication life.
- Precision Operation: Manufactured to a P4A tolerance class, this bearing ensures minimal runout and vibration, which is critical for applications requiring smooth, precise rotation.
71913 ACB/HCP4ADT Bearing Typical Application Areas
This high-precision, high-speed bearing set is ideally suited for advanced applications where rigidity, speed, and accuracy are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: High-accuracy robotic arms and joints.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and auxiliary power units.
- High-Frequency Motors and Spindles: Motors for PCB drilling and dental handpieces.
