71819 CD/P4DGC
71800 Series Super Precision Angular Contact Ball Bearings
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Main Dimensions
Ball & Washer Dimensions
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71819 CD/P4DGC Bearing Product Overview & Core Advantages
The 71819 CD/P4DGC is a precision angular contact ball bearing designed for applications demanding high rotational accuracy and rigidity. As a universally matchable (SU) bearing supplied in a pre-set pair, it is engineered to accommodate combined loads—simultaneously handling significant radial and axial forces. Its P4 tolerance class ensures exceptional dimensional and running accuracy, making it ideal for high-speed spindles and other high-precision machinery. The moderate preload (Class C) provides optimal stiffness and minimizes deflection under operational stresses.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 71819 | Basic bearing series and size designation (95mm bore, 120mm OD, 26mm width). |
| C | Designates a 15° contact angle, optimized for high-speed performance and moderate axial load capacity. |
| D | Indicates the bearing is part of a universally matchable (SU) pair. Two such bearings can be mounted in any configuration (face-to-face, back-to-back, or tandem) to achieve the required stiffness and load support. |
| P4 | Specifies the high-precision tolerance class, ensuring tight dimensional control and minimal runout for superior rotational accuracy. |
| DG | Represents the moderate preload (Class C). This preload eliminates internal clearance, increasing system rigidity and improving positional accuracy. |
| C | Indicates the phenolic resin cage material. This lightweight cage contributes to lower inertia and is suitable for high-speed operation. |
71819 CD/P4DGC Bearing Structural Features & Performance Benefits
High Rigidity and Load Capacity: The angular contact design and universal matching capability allow two bearings to be paired, creating a highly rigid system that effectively supports combined radial and axial loads from both directions. The moderate preload further enhances this rigidity, reducing system deflection under load.
High-Speed Performance: The combination of a 15° contact angle and a lightweight phenolic cage minimizes centrifugal forces and friction, enabling the bearing to achieve a high limiting speed of 15,000 rpm. This makes it an excellent choice for high-speed applications.
Precision Engineering: Manufactured to P4 tolerance standards, this bearing guarantees precise internal geometry and running accuracy, which is critical for applications requiring minimal vibration and high positional repeatability.
Optimized Material Selection: The use of chrome steel for both rings and balls ensures high durability and fatigue life, capable of operating within a temperature range of -30°C to 110°C.
71819 CD/P4DGC Bearing Typical Application Areas
The 71819 CD/P4DGC is ideally suited for high-performance machinery where precision, speed, and rigidity are paramount. Key application areas include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling machines and high-frequency motor spindles.
- Robotics: High-accuracy joints and rotary actuators.
- Medical Equipment: Dental handpieces and imaging device rotors.
- Axial Compressors and Pumps: Where reliable handling of combined loads is required.
