71913 CD/P4ADBC
71900 Series Super Precision Angular Contact Ball Bearings
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71913 CD/P4ADBC Bearing Product Overview & Core Advantages
The 71913 CD/P4ADBC is a precision angular contact ball bearing designed for demanding applications requiring high rotational accuracy and rigidity. This duplex back-to-back (DB) arrangement consists of two matched bearings, preloaded to provide exceptional system stiffness and minimize axial and radial runout. Its P4A tolerance class ensures superior dimensional and running accuracy, making it ideal for high-speed spindles and other precision machinery where moderate preload and reliable performance under combined loads are critical.
71913 CD/P4ADBC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71913 | Basic bearing series and size designation (65mm bore, 90mm OD, 26mm width). |
| C | 15° contact angle, optimized for carrying combined radial and axial loads. |
| D | Indicates a duplex pair of two bearings. |
| P4A | High precision tolerance class, offering very tight dimensional and running accuracy limits. |
| DB | Back-to-Back arrangement. This configuration provides high moment rigidity and excellent stability. |
| C (Preload) | Moderate preload class, balancing rigidity, speed, and thermal performance. |
71913 CD/P4ADBC Bearing Structural Features & Performance Benefits
High Rigidity & Stability: The duplex back-to-back (DB) arrangement creates a wide, rigid support system that effectively resists moment loads and shaft deflection, ensuring precise rotational alignment.
Superior Load Capacity: With a 15° contact angle and duplex design, this bearing is engineered to handle significant combined radial and axial loads simultaneously. The dynamic load rating of 7470 lbf and static load rating of 7538 lbf confirm its robust performance.
Optimized High-Speed Performance: The lightweight phenolic cage minimizes centrifugal forces, contributing to a high limiting speed of 31,000 rpm. The moderate preload is specifically calibrated for high-speed operation, reducing friction and heat generation.
Precision & Reliability: Manufactured to P4A tolerance class with tight bore, OD, and width tolerances, this bearing guarantees minimal runout and vibration. The use of high-grade chrome steel for rings and balls ensures long-term durability and consistent performance within a temperature range of -30°C to 110°C.
71913 CD/P4ADBC Bearing Typical Application Areas
The 71913 CD/P4ADBC is ideally suited for high-precision, high-speed applications, including:
- Machine Tool Spindles: CNC machining centers, grinding spindles, and milling heads.
- High-Speed Drives: Precision spindles for routers, engravers, and PCB drilling machines.
- Robotics: High-accuracy joints and rotary actuators.
- Medical Equipment: Dental handpieces and laboratory centrifuges.
- Aerospace & Defense: Gyroscopes, radar systems, and navigation instruments.
