71804 ACD/P4QBCC
71800 Series Super Precision Angular Contact Ball Bearings
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71804 ACD/P4QBCC Bearing Product Overview & Core Advantages
The 71804 ACD/P4QBCC is a super-precision angular contact ball bearing designed for the most demanding applications. Its core advantage lies in its quadruplex back-to-back (QBC) matched arrangement, which provides exceptional system rigidity and stability under complex combined loads (radial and axial). Manufactured to P4 tolerance class, it guarantees ultra-high running accuracy, making it ideal for high-speed spindles and other precision machinery requiring maximum performance and reliability.
71804 ACD/P4QBCC Bearing Model Code Explained, Specifications & Naming Convention
- 71804: Basic series designation for a metric, super-precision angular contact ball bearing.
- ACD: Angular Contact design with a D contact angle (25°).
- P4: Denotes the tolerance class, indicating very high precision levels for runout and dimensions.
- QBCC: Specifies the Quadruplex Back-to-Back arrangement, Class C preload. This matched set of four bearings is optimized for maximum rigidity.
71804 ACD/P4QBCC Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The quadruplex back-to-back configuration creates a highly rigid bearing system capable of withstanding significant moment loads and combined radial and axial loads from both directions. The 25° contact angle is optimized for high axial load capacity.
Super-Precision & High-Speed Performance: Built to ABEC 7 / P4 tolerance standards, this bearing ensures minimal vibration and superior running accuracy. The lightweight phenolic resin cage and optimized internal geometry contribute to excellent high-speed performance, with a limiting speed of 121,000 rpm.
Optimized Preload: The Class C (moderate) preload is applied in the factory, ensuring immediate high stiffness and precise rotational accuracy upon installation, eliminating the need for complex setup.
71804 ACD/P4QBCC Bearing Typical Application Areas
This bearing is engineered for ultra-precise, high-speed, and high-rigidity applications, including:
- High-Frequency Machine Tool Spindles
- Precision Grinding Spindles
- High-Speed Machining Centers
- Advanced Robotics and Automation
- Medical and Dental Equipment Spindles
