71811 CD/P4QFCC
71800 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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71811 CD/P4QFCC Bearing Product Overview & Core Advantages
The 71811 CD/P4QFCC is a precision quadruplex matched set of angular contact ball bearings designed for applications demanding exceptional rigidity and accuracy. This metric system bearing is pre-lubricated and features a Moderate (Class C) preload, making it ideal for high-precision spindles and other machinery requiring minimal deflection under complex combined loads. Its compact design and P4 tolerance class ensure superior running accuracy and reliable performance in demanding operational conditions.
71811 CD/P4QFCC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71811 | Basic bearing designation, indicating a 55 mm bore diameter, 72 mm outside diameter, and 36 mm width. |
| C | Designates a 15° contact angle, optimized for high-speed operation and accommodating significant axial loads. |
| D | Indicates the bearing is supplied with a Moderate preload (Class C) for enhanced system rigidity. |
| P4 | Specifies the tolerance class, denoting very high precision levels for dimensional and running accuracy. |
| QFC | Denotes the matched arrangement as a Quadruplex Face-to-Face set of four bearings, providing maximum rigidity and stability. |
| C | (Final C) Indicates the cage material is Phenolic, suitable for high-speed operation. |
71811 CD/P4QFCC Bearing Structural Features & Performance Benefits
This bearing set's performance is defined by its specific construction:
- High Rigidity & Load Capacity: The Quadruplex Face-to-Face (QFC) arrangement of four bearings creates an extremely rigid support system, capable of handling heavy combined radial and axial loads from both directions with minimal deflection.
- Precision & High-Speed Performance: Manufactured to P4 tolerance class with a 15° contact angle and a lightweight Phenolic cage, this set is engineered for smooth operation and a high limiting speed of 34,000 rpm, making it an excellent high-speed bearing solution.
- Optimized Preload: The factory-set Moderate (Class C) preload eliminates internal clearance, ensuring precise shaft positioning, reducing vibration, and enhancing the system's dynamic response.
- Durable Materials: Constructed from Chrome Steel for both rings and balls, the bearing provides high fatigue life and reliable operation within a temperature range of -30°C to 110°C.
71811 CD/P4QFCC Bearing Typical Application Areas
The 71811 CD/P4QFCC is ideally suited for high-precision, high-rigidity applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling and routing machines.
- High-Frequency Motors
- Other precision machinery requiring maximum stiffness and accuracy.
