71904 CE/HCPA9ADT
Hybrid Ceramic Super Precision Bearings
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71904 CE/HCPA9ADT Bearing Product Overview & Core Advantages
The 71904 CE/HCPA9ADT is a precision angular contact ball bearing designed for high-performance applications requiring exceptional rigidity and speed capabilities. This duplex tandem (DT) matched set features two bearings preloaded against each other, enabling it to handle significant combined loads (radial and axial) in one direction with maximum stiffness. Manufactured to PA9A tolerance class with ceramic balls and a phenolic cage, it delivers superior high-speed performance, thermal stability, and extended service life in demanding environments.
71904 CE/HCPA9ADT Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71904 | Basic bearing series and size designation (20mm bore, 37mm OD) |
| CE | Contact angle of 15° |
| HC | Hybrid ceramic balls (silicon nitride) |
| PA9A | High-precision tolerance class (PA9A) |
| DT | Duplex Tandem arrangement (2 bearings preloaded in tandem) |
71904 CE/HCPA9ADT Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The duplex tandem arrangement provides exceptional axial stiffness, making it ideal for applications requiring minimal deflection under heavy combined loads. The 15° contact angle optimizes axial load carrying capacity.
High-Speed Performance: The combination of ceramic balls (lower density, reduced centrifugal forces) and phenolic cage (lightweight, self-lubricating) enables operation at limiting speeds up to 100,000 rpm with reduced friction and heat generation.
Precision & Accuracy: Manufactured to PA9A tolerance class with precise bearing dimensions and optimized internal geometry, ensuring smooth operation and positional accuracy in precision machinery.
Preloaded Configuration: The bearings are supplied as a matched set with preload applied, eliminating internal clearance and providing immediate high rigidity without requiring additional adjustment during installation.
71904 CE/HCPA9ADT Bearing Typical Application Areas
- High-speed machine tool spindles for precision machining centers
- Precision grinding spindles requiring high rigidity and accuracy
- High-frequency motor spindles in industrial automation
- Dental handpieces and medical instrumentation
- Aerospace components and instrumentation requiring high-speed precision
- High-performance robotics and automation systems
