71905 CD/HCP4A
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 71905 CD/HCP4A is a single-row angular contact ball bearing engineered for high-precision applications requiring exceptional rotational accuracy and speed capability. This metric-series bearing features a 15° contact angle and is supplied with preload, delivering superior axial rigidity and precise shaft positioning. Manufactured to P4 (ABEC-7) tolerance class, it incorporates ceramic balls and a phenolic cage, making it ideally suited for high-speed operation and demanding conditions where minimal vibration and thermal stability are critical.
71905 CD/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71905 | Basic bearing series and size designation (25mm bore, 42mm OD, 9mm width) |
| CD | Contact angle designation (15° contact angle) |
| HC | Hybrid Ceramic construction (steel rings with ceramic balls) |
| P4A | P4 tolerance class with specific accuracy requirements and preload |
Structural Features and Performance Benefits
Hybrid Ceramic Design: The combination of chrome steel rings with silicon nitride (Si3N4) ceramic balls significantly reduces centrifugal forces, enabling higher limiting speeds (70,000 rpm) while providing excellent electrical insulation and corrosion resistance.
Precision Preload: The bearing is supplied with preload, eliminating internal clearance to deliver enhanced stiffness and minimal axial/radial runout, crucial for high-precision spindle applications.
Advanced Cage Technology: The phenolic resin cage offers excellent strength-to-weight ratio, reduced friction, and superior performance at high rotational speeds compared to metallic cages.
Superior Lubrication: Factory lubrication with high-performance grease ensures optimal performance across the operating temperature range (-30° to 110°C).
71905 CD/HCP4A Bearing Typical Application Areas
- Machine Tool Spindles: High-speed machining centers, grinding spindles, and precision lathes
- High-Speed Motors: CNC spindle motors, dental handpieces, and turbo-molecular pumps
- Aerospace Systems: Gyroscopes, navigation instruments, and auxiliary power units
- Medical Equipment: Dental drills, surgical hand tools, and laboratory centrifuges
- Semiconductor Manufacturing: Wafer handling robots, precision positioning stages
