71818 CD/P4DGC
71800 Series Super Precision Angular Contact Ball Bearings
Image may differ from product. See technical specification for details.
Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
71818 CD/P4DGC Bearing Product Overview & Core Advantages
The 71818 CD/P4DGC is a precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. As a universally matchable (SU) bearing supplied in a moderate preload (Class C) duplex set, it is engineered to handle combined loads—simultaneously supporting significant radial and axial forces. Its P4 tolerance class ensures ultra-precise dimensions and running accuracy, making it ideal for high-speed spindles and other high-precision machinery. The phenolic cage and optimized 15° contact angle contribute to its superior high-speed performance and smooth operation.
71818 CD/P4DGC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71818 | Basic bearing series and size designation (90mm bore, 115mm OD, 26mm width). |
| CD | Indicates a universally matchable (SU) duplex pair with a moderate preload (Class C). This configuration provides high rigidity and is designed for mounting in either a back-to-back (DB) or face-to-face (DF) arrangement. |
| P4 | Denotes a high-precision tolerance class, with extremely tight limits on bore, outside diameter, and width tolerances for superior running accuracy. |
| DGC | Specifies the cage material and lubrication. The phenolic (polyamide) cage is suitable for high speeds and the bearing is factory lubricated for immediate use. |
71818 CD/P4DGC Bearing Structural Features & Performance Benefits
- High Rigidity and Load Capacity: The duplex (matched pair) design and 15° contact angle create a highly rigid bearing system capable of withstanding combined radial and axial loads from both directions. This is essential for applications requiring minimal shaft deflection.
- Superior High-Speed Performance: The lightweight phenolic cage reduces centrifugal forces, while the optimized internal geometry and precision P4 grading allow for a high limiting speed of 15,000 rpm, making it an excellent high-speed bearing.
- Precision Engineering: Manufactured to P4 tolerance class, this bearing guarantees precise internal clearances and running accuracy, which is critical for applications like machine tool spindles.
- Optimized Internal Geometry: With 31 high-grade chrome steel balls of 7.144mm diameter, the bearing ensures smooth rotation and a high dynamic load rating of 8055 lbf.
71818 CD/P4DGC Bearing Typical Application Areas
The 71818 CD/P4DGC is ideally suited for high-performance applications across various industries, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Instrumentation: Measuring devices and high-accuracy rotary tables.
- High-Frequency Motors and Spindles: Where high rotational speed and rigidity are paramount.
- Medical Equipment: Dental handpieces and imaging device rotors.
- Robotics: Precision joints and arm actuators requiring high stiffness.
