71804 ACD/P4QFCC
71800 Series Super Precision Angular Contact Ball Bearings
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71804 ACD/P4QFCC Bearing Product Overview & Core Advantages
The 71804 ACD/P4QFCC is a high-precision quadruplex matched set of angular contact ball bearings designed for the most demanding applications. This metric system bearing set is characterized by its P4 super-precision tolerance class and Moderate (Class C) preload, ensuring exceptional running accuracy and system rigidity. Its core advantage lies in the Quadruplex Face-to-Face (QFC) arrangement, which provides superior stability and the ability to handle complex combined loads (radial and axial) from multiple directions simultaneously, making it ideal for high-speed, high-rigidity spindles.
71804 ACD/P4QFCC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71804 | Basic bearing series and size designation (20mm bore, 32mm OD, 28mm width). |
| ACD | Angular Contact design with a 25° contact angle. |
| P4 | Indicates a super-precision tolerance class, signifying extremely tight dimensional and running accuracy. |
| QFC | Specifies the Quadruplex Face-to-Face matched arrangement of four bearings. |
| C | Denotes a Moderate preload (Class C) for optimal balance between rigidity and speed. |
71804 ACD/P4QFCC Bearing Structural Features & Performance Benefits
- Extreme Rigidity and Stability: The Quadruplex Face-to-Face (QFC) arrangement creates an exceptionally stiff bearing system that minimizes deflection under heavy combined loads, crucial for maintaining precision in machining operations.
- Superior Load Capacity: With a 25° contact angle and four bearings working in tandem, the set offers high radial and axial load capacity, effectively managing complex load conditions from various directions.
- High-Speed Capability: The lightweight phenolic resin cage reduces centrifugal forces, while the precision-ground chrome steel balls and raceways contribute to a high limiting speed of 121,000 rpm, enabling smooth operation at extreme velocities.
- Precision Performance: The P4 tolerance class ensures minimal runout and vibration, which is fundamental for achieving superior surface finishes and high positional accuracy in the final application.
- Optimized Preload: The factory-set Moderate (Class C) preload eliminates internal clearance, enhancing system stiffness and rotational accuracy without generating excessive heat, simplifying installation and ensuring immediate peak performance.
71804 ACD/P4QFCC Bearing Typical Application Areas
This bearing set is engineered for high-performance machinery where ultimate precision, speed, and rigidity are non-negotiable. Key applications include:
- High-Frequency CNC Machining Spindles
- Precision Grinding Spindles
- High-Speed Router and Milling Machine Spindles
- Advanced Dental and Medical Equipment Drives
- Aerospace Test and Measurement Equipment
