71813 CD/P4DFB
71800 Series Super Precision Angular Contact Ball Bearings
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71813 CD/P4DFB Bearing Product Overview & Core Advantages
The 71813 CD/P4DFB is a precision duplex angular contact ball bearing specifically designed for applications requiring exceptional rotational accuracy and rigidity. This matched pair in a face-to-face (DF) arrangement is preloaded to Class B (Light), delivering superior system stability and minimizing axial and radial runout. Its primary advantage lies in its ability to handle combined loads (radial and axial) simultaneously with high precision, making it ideal for high-speed spindles and other demanding machinery where high rigidity and minimal deflection are critical.
71813 CD/P4DFB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71813 | Basic bearing designation, indicating a metric, single-row angular contact ball bearing with a 65mm bore, 85mm OD, and 20mm width. |
| C | Specifies a 15° contact angle, optimized for handling moderate axial loads. |
| D | Indicates the bearing is part of a duplex pair (two bearings supplied as a set). |
| P4 | Denotes a high precision tolerance class (equivalent to ABEC 7), ensuring extremely tight dimensional and running accuracy. |
| DF | Specifies the Duplex Face-to-Face mounting arrangement. This configuration increases system rigidity and is less sensitive to misalignment compared to other duplex setups. |
| B | Indicates a specific light preload is applied to the matched set, eliminating internal clearance for enhanced stiffness and precise rotational performance. |
71813 CD/P4DFB Bearing Structural Features & Performance Benefits
The performance of the 71813 CD/P4DFB is a direct result of its meticulous design and material selection:
- High Rigidity & System Stability: The duplex face-to-face (DF) arrangement with a light preload (Class B) creates a highly rigid bearing system that effectively resists moment loads and minimizes shaft deflection under operational forces.
- Precision Performance: Manufactured to P4 tolerance class, this bearing guarantees exceptional running accuracy, low noise, and low vibration, which is essential for applications like high-speed machining.
- Optimized High-Speed Capability: The phenolic resin cage is lightweight and possesses excellent sliding properties, contributing to lower friction, reduced centrifugal forces, and a high limiting speed of 36,000 rpm. The standard lubrication is suitable for this operational range.
- Superior Load Capacity: With a 15° contact angle and high-grade chrome steel construction for both rings and balls, this bearing is engineered to reliably support significant combined radial and axial loads.
71813 CD/P4DFB Bearing Typical Application Areas
This precision duplex bearing is engineered for high-performance applications across various industries, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers where precision and rigidity are paramount.
- Precision Grinding Spindles: Applications demanding the utmost in rotational accuracy and surface finish quality.
- High-Frequency Motors: Spindles for PCB drilling and other high-RPM electric motors.
- Industrial Pumps and Compressors: For shafts requiring precise axial location and handling of combined loads.
- Robotic Arms and Precision Gearboxes: Where compact, high-stiffness bearing arrangements are critical for positioning accuracy.
