71804 CD/P4QBCC
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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71804 CD/P4QBCC Bearing Product Overview & Core Advantages
The 71804 CD/P4QBCC is a super-precision angular contact ball bearing designed for the most demanding applications. As part of a quadruplex back-to-back (QBC) matched set, this bearing is engineered to provide exceptional system rigidity and accuracy. Its key advantage lies in its ability to handle combined loads (radial and axial) simultaneously while maintaining high rotational accuracy under moderate preload (Class C). Built to P4 tolerance standards, it is the ideal choice for high-speed spindles and precision machinery requiring maximum stability and minimal runout.
71804 CD/P4QBCC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71804 | Basic bearing designation: 20 mm bore, 32 mm OD, 28 mm width |
| CD | Contact angle of 15° |
| P4 | High precision tolerance class (equivalent to ABEC 7) |
| QBCC | Quadruplex Back-to-Back matched set with moderate preload (Class C) |
71804 CD/P4QBCC Bearing Structural Features & Performance Benefits
Optimized Rigidity & Load Capacity: The back-to-back quadruplex arrangement creates a wide effective spread, significantly increasing system rigidity and moment load capacity. This configuration is exceptionally stable under combined radial and axial loads.
High-Speed Capability: The phenolic resin cage provides excellent strength-to-weight ratio, reducing centrifugal forces and enabling operation at limiting speeds up to 100,500 rpm. The 15° contact angle is optimized for high-speed performance.
Precision Engineering: Manufactured to P4 tolerance class with tight dimensional control (bore/OD tolerance: -0.004mm to 0), ensuring minimal runout and vibration for superior rotational accuracy.
Material Excellence: Constructed from chrome steel for both rings and balls, providing high hardness, wear resistance, and dimensional stability across the operating temperature range (-30°C to 110°C).
71804 CD/P4QBCC Bearing Typical Application Areas
- Machine Tool Spindles: High-speed milling, grinding, and turning centers requiring extreme precision and rigidity
- Precision Robotics: High-accuracy robotic arms and CNC automation systems
- Aerospace Components: Gyroscopes, navigation systems, and auxiliary power units
- Medical Equipment: Dental handpieces, surgical robots, and high-speed centrifuges
- Semiconductor Manufacturing: Wafer handling robots and precision positioning stages
