71908 CE/HCP4AQBCA
Hybrid Ceramic Super Precision Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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Product Overview and Core Advantages
The 71908 CE/HCP4AQBCA is a high-precision quadruplex angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. This matched set configuration features four bearings arranged in a back-to-back (QBC) duplex, enabling it to withstand combined radial and axial loads from multiple directions simultaneously. Manufactured to P4A tolerance class with a 15° contact angle and ceramic balls, it delivers superior performance in high-speed operation and offers excellent dimensional stability under complex loading conditions.
71908 CE/HCP4AQBCA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71908 | Basic bearing designation (40mm bore, 62mm OD) |
| CE | 15° contact angle |
| HC | Hybrid ceramic balls |
| P4A | High precision tolerance class |
| QBC | Quadruplex back-to-back arrangement |
Structural Features and Performance Benefits
Exceptional Rigidity and Load Capacity: The quadruplex back-to-back configuration creates a highly rigid bearing system capable of handling complex combined loads including moment loads. This arrangement provides optimal preload distribution for maximum system stability.
High-Speed Performance: Featuring hybrid ceramic balls and a phenolic cage, this bearing achieves superior limiting speeds of 56,000 rpm. The ceramic balls reduce centrifugal forces and provide excellent thermal stability during high-speed operation.
Precision Engineering: Manufactured to P4A tolerance class with tight dimensional control (bore tolerance: -0.004mm to 0), this bearing ensures precise rotational accuracy and minimal runout for critical applications.
Advanced Material Selection: The combination of chrome steel rings and ceramic balls provides enhanced durability, reduced friction, and extended service life under demanding operating conditions.
71908 CE/HCP4AQBCA Bearing Typical Application Areas
- Machine Tool Spindles: High-precision machining centers and grinding spindles requiring extreme accuracy and rigidity
- High-Speed Machining Centers: Applications demanding superior rotational precision at elevated speeds
- Precision Instrumentation: Medical equipment, measuring devices, and laboratory instruments
- Aerospace Components: Guidance systems, actuators, and other critical aerospace applications
- Robotics and Automation: High-precision robotic arms and automated manufacturing equipment
