71811 CD/P4QGB
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/P4QGB Bearing Product Overview & Core Advantages
The 71811 CD/P4QGB is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. Engineered with P4 tolerance class and universal matchable (SU) design, this bearing excels in handling combined radial and axial loads simultaneously. Its light preload (Class B) ensures smooth operation with minimal deflection, making it ideal for high-speed spindles and precision machinery where dimensional stability is critical.
71811 CD/P4QGB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71811 | Basic bearing designation indicating metric dimensions (55mm bore, 72mm OD) |
| CD | Contact angle of 15° and optimized internal design for high-speed operation |
| P4 | Ultra-precision tolerance class ensuring minimal runout and vibration |
| QGB | Special grouping code indicating universal matching capability for preloaded sets |
71811 CD/P4QGB Bearing Structural Features & Performance Benefits
Precision Engineering: Manufactured to P4 tolerance standards with bore and outside diameter tolerances of -0.004mm to 0, ensuring exceptional dimensional accuracy and runout control.
High-Speed Capability: Features a phenolic resin cage and 15° contact angle, enabling stable operation at limiting speeds up to 34,000 rpm while maintaining thermal stability.
Superior Load Capacity: With a dynamic load rating of 6,075 lbf and static load rating of 9,675 lbf, this bearing reliably handles combined loads in demanding applications.
Universal Matching Design: The SU designation allows for flexible bearing arrangements with precise preload control when used in matched sets of up to 4 bearings.
Material Excellence: Constructed from chrome steel rings and balls with 29 precision balls of 4.762mm diameter, ensuring durability and consistent performance.
71811 CD/P4QGB Bearing Typical Application Areas
- Machine Tool Spindles: High-precision machining centers and grinding spindles requiring minimal runout
- Precision Instrumentation: Measuring equipment and optical systems demanding exceptional rotational accuracy
- High-Speed Motors: Spindle motors and high-frequency applications where thermal stability is critical
- Robotic Systems: Precision joints and rotary tables in automated manufacturing equipment
- Aerospace Components: Guidance systems and auxiliary equipment requiring reliable performance under combined loads
