71918 CD/P4ADFB
71900 Series Super Precision Angular Contact Ball Bearings
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71918 CD/P4ADFB Bearing Product Overview & Core Advantages
The 71918 CD/P4ADFB is a precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. This duplex face-to-face (DF) matched set is preloaded to Light / Class B specifications, providing superior system stability and minimizing axial and radial runout. Its primary advantage lies in its ability to handle combined loads—significant radial loads alongside substantial axial loads in both directions—making it ideal for high-precision, high-rigidity spindles and machinery. Manufactured to the exacting P4A tolerance class, it ensures consistent performance in the most demanding operational environments.
71918 CD/P4ADFB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71918 | Basic bearing designation, indicating a metric, angular contact bearing with a 90 mm bore, 125 mm OD, and 36 mm width. |
| C | Specifies a 15° contact angle, optimized for high-speed operation and high axial load capacity. |
| D | Indicates the bearing is part of a duplex face-to-face (DF) matched set. |
| P4A | Denotes an ultra-precision tolerance class with enhanced dimensional and running accuracy, superior to ABEC 7. |
| DF | Confirms the duplex face-to-face arrangement of the two bearings in the set. |
| B | Specifies a Light preload (Class B), which increases system rigidity and minimizes deflection under load. |
71918 CD/P4ADFB Bearing Structural Features & Performance Benefits
- High Rigidity & System Stability: The duplex face-to-face (DF) arrangement and light preload work in tandem to create an exceptionally rigid bearing system. This configuration effectively counteracts moment loads and significantly reduces axial and radial displacement under operational stresses, which is critical for maintaining precision in machine tool spindles.
- Superior Load Capacity: With a 15° contact angle and a high dynamic load rating of 17,122 lbf, this bearing is engineered to handle demanding combined loads, ensuring reliable performance under complex force conditions.
- Optimized High-Speed Performance: The lightweight phenolic resin cage minimizes centrifugal forces and ensures stable guidance of the balls at high rotational speeds, contributing to the bearing's high limiting speed of 15,000 rpm. The open design facilitates efficient lubrication and heat dissipation.
- Precision Engineering: Manufactured to P4A tolerance class with tight dimensional tolerances on the bore, outside diameter, and width, this bearing guarantees minimal runout and consistent, predictable performance in high-precision applications.
71918 CD/P4ADFB Bearing Typical Application Areas
The 71918 CD/P4ADFB is specifically designed 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 Grinding Spindles: Applications requiring extreme accuracy and surface finish quality.
- High-Frequency Spindles: For PC board drilling and other high-RPM machining operations.
- Industrial Pumps and Compressors: Where reliable operation under combined loads is essential.
