71909 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 71909 CE/HCP4AQBCA is a high-precision quadruplex angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. This metric system bearing features a back-to-back quadruplex arrangement (QBC), enabling it to withstand significant combined loads including radial and bidirectional axial forces. Manufactured to P4A tolerance class with ceramic balls and a phenolic cage, it delivers superior high-speed performance and thermal stability, making it ideal for ultra-precision machinery where reliability is critical.
71909 CE/HCP4AQBCA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71909 | Basic bearing series and size designation |
| CE | Contact angle of 15° |
| HC | Hybrid ceramic balls |
| P4A | High precision tolerance class |
| QBC | Quadruplex back-to-back arrangement |
Structural Features and Performance Benefits
Enhanced Rigidity and Load Capacity: The quadruplex back-to-back configuration creates an exceptionally rigid bearing system capable of handling substantial combined radial and axial loads in both directions. This arrangement provides superior moment load resistance compared to single or duplex bearings.
High-Speed Capability: The combination of ceramic balls (lower density, reduced centrifugal forces) and phenolic cage (lightweight with excellent sliding properties) enables operation at limiting speeds up to 41,000 rpm. The 15° contact angle optimizes the balance between axial and radial load capacity for high-speed applications.
Precision Performance: Manufactured to P4A tolerance class with tight dimensional controls (bore and OD tolerance: -0.004mm to 0), this bearing ensures minimal runout and vibration for applications requiring exceptional rotational accuracy.
Thermal Stability: The phenolic cage material provides excellent dimensional stability across the operating temperature range (-30°C to 110°C), maintaining consistent performance under thermal variations.
71909 CE/HCP4AQBCA Bearing Typical Application Areas
- High-speed machine tool spindles for precision machining centers
- Precision grinding machine spindles requiring minimal thermal expansion
- High-frequency motor spindles in semiconductor manufacturing equipment
- Aerospace positioning systems demanding high rigidity and accuracy
- Medical device rotary systems where reliability and precision are critical
- Robotic arm joints requiring high moment load capacity
