71806 CD/P4QBCB
71800 Series Super Precision Angular Contact Ball Bearings
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71806 CD/P4QBCB Bearing Product Overview & Core Advantages
The 71806 CD/P4QBCB is a super-precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. As part of a quadruplex matched set in a back-to-back (QBC) arrangement, this bearing is engineered to handle complex combined loads (radial and axial) simultaneously. Its P4 tolerance class and light preload (Class B) ensure smooth, high-speed operation with minimal runout, making it ideal for high-precision spindles and other critical machinery components where uncompromising performance is required.
71806 CD/P4QBCB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71806 | Basic bearing designation, indicating a metric series, 30mm bore, 42mm OD super-precision bearing. |
| CD | Indicates a 15° contact angle, optimized for high-speed applications with significant axial load capacity. |
| P4 | Specifies the tolerance class, corresponding to ABEC 7 / ISO P4, denoting extremely tight dimensional and running accuracy. |
| QBC | Denotes the bearing is one of four in a Quadruplex Back-to-Back (QBC) matched set, providing maximum rigidity and moment load capacity. |
| B | Indicates the preload level, in this case, Light Preload (Class B), which minimizes friction and heat generation at high speeds. |
71806 CD/P4QBCB Bearing Structural Features & Performance Benefits
Unmatched Rigidity and Load Capacity: The back-to-back quadruplex arrangement creates an extremely rigid bearing system capable of withstanding heavy combined loads and significant moment loads, which is critical for maintaining precision under operational stress.
Optimized for High-Speed Operation: The combination of a 15° contact angle and a lightweight, durable phenolic cage reduces centrifugal forces and friction, enabling a high limiting speed of 83,000 rpm. The light preload further enhances high-speed performance by controlling axial play without generating excessive heat.
Precision and Longevity: Manufactured to P4 tolerance class with chrome steel rings and balls, this bearing guarantees exceptional running accuracy and long-term dimensional stability. The open seal type allows for optimal lubrication management in controlled environments, maximizing service life.
71806 CD/P4QBCB Bearing Typical Application Areas
This high-precision quadruplex bearing set is specifically designed for the most demanding applications, including:
- High-Speed Machine Tool Spindles (e.g., for milling, grinding, and drilling)
- Precision Robotic Drives and Rotary Joints
- Aerospace and Defense Gyroscopes and Instrumentation
- High-Frequency Medical and Dental Handpieces
- Advanced Semiconductor Manufacturing Equipment
