71904 CD/P4AQBCC
71900 Series Super Precision Angular Contact Ball Bearings
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71904 CD/P4AQBCC Bearing Product Overview & Core Advantages
The 71904 CD/P4AQBCC is a precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. This metric bearing features a matched quadruplex back-to-back (QBC) arrangement, providing superior stability and the ability to withstand combined loads (radial and axial). With a P4A tolerance class and moderate preload (Class C), it is engineered for high-precision, high-reliability scenarios such as precision spindles and machine tools.
71904 CD/P4AQBCC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71904 | Basic bearing series and size designation |
| CD | Contact angle of 15° |
| P4A | High precision tolerance class for superior running accuracy |
| QBCC | Quadruplex Back-to-Back arrangement with moderate preload (Class C) |
71904 CD/P4AQBCC Bearing Structural Features & Performance Benefits
High Rigidity & Stability: The quadruplex back-to-back (QBC) matched arrangement creates a highly rigid bearing system that effectively resists moment loads and maintains precise shaft positioning.
Optimized Load Capacity: With a 15° contact angle, this bearing is engineered to handle significant combined radial and axial loads simultaneously. The dynamic load rating of 3578 lbf and static load rating of 2902 lbf ensure reliable performance under demanding conditions.
Precision Performance: Manufactured to P4A tolerance class with tight dimensional tolerances on bore, outside diameter, and width, this bearing delivers exceptional running accuracy and minimal vibration.
High-Speed Capability: The phenolic cage and optimized internal design contribute to a high limiting speed of 80,000 rpm, making it suitable for high-speed applications.
71904 CD/P4AQBCC Bearing Typical Application Areas
The 71904 CD/P4AQBCC is ideally suited for precision applications requiring high rigidity and accuracy, including:
- Machine Tool Spindles - High-precision machining centers and grinding spindles
- Precision Instrumentation - Measuring devices and laboratory equipment
- High-Speed Machining Centers - Where rotational accuracy and stability are critical
- Robotic Systems - Precision joints and positioning mechanisms
- Aerospace Components - Guidance systems and control mechanisms
