71911 CD/P4ADFA
71900 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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Product Overview and Core Advantages
The 71911 CD/P4ADFA is a precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. As a duplex face-to-face (DF) matched set, it offers superior performance in handling combined loads (radial and axial) from both directions simultaneously. Manufactured to the stringent P4A tolerance class, this bearing ensures minimal runout and vibration, making it ideal for high-precision, high-speed spindles. Its compact design, featuring a 55 mm bore and 26 mm width, provides a high load capacity within a minimal envelope.
71911 CD/P4ADFA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71911 | Basic bearing series, indicating a high-precision, light series angular contact bearing with a 55 mm bore and 80 mm outside diameter. |
| C | Designates a 15° contact angle, optimized for high-speed applications with moderate axial load capacity. |
| D | Indicates the bearing is part of a duplex pair (two bearings mounted together). |
| P4A | Specifies the tolerance class, denoting very high precision levels for both dimensional and running accuracy. |
| DF | Specifies the matched arrangement as Face-to-Face (Duplex DF). This configuration increases rigidity and is effective for moment loads. |
| A | Indicates the preload level is Extra Light (Class A), minimizing friction and heat generation for optimal high-speed operation. |
Structural Features and Performance Benefits
High Rigidity and Load Capacity: The duplex face-to-face (DF) arrangement of two bearings creates a highly rigid system capable of withstanding significant combined radial and axial loads from both directions, as well as moment loads. This is critical for maintaining accuracy under heavy cutting forces or operational stresses.
Superior High-Speed Performance: The combination of a 15° contact angle and a lightweight, durable phenolic resin cage minimizes centrifugal forces and friction, enabling a high limiting speed of 34,000 rpm. The extra light preload (Class A) further reduces operating torque and heat buildup.
Exceptional Precision and Stability: Manufactured to ABEC 7 / P4A tolerance standards with extremely tight bore, outside diameter, and width tolerances, this bearing guarantees minimal runout and smooth, quiet operation, which is essential for achieving superior surface finishes and machining accuracy.
Optimized Material Selection: The use of high-grade chrome steel for both rings and balls ensures high durability, wear resistance, and long service life under demanding conditions.
71911 CD/P4ADFA Bearing Typical Application Areas
- Machine Tool Spindles: High-speed milling, grinding, and turning centers where precision, rigidity, and speed are paramount.
- Precision Grinding Spindles: Applications requiring the highest levels of rotational accuracy and surface finish quality.
- High-Frequency Motors: Spindles for PCB drilling and other high-RPM electric motor applications.
- Industrial Pumps and Compressors: For shafts requiring precise axial location and high-speed capability.
