S71903 CD/HCP4A
Hybrid Ceramic Super Precision Bearings
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Ball & Washer Dimensions
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S71903 CD/HCP4A Bearing Product Overview & Core Advantages
The S71903 CD/HCP4A is a high-precision angular contact ball bearing engineered for applications demanding exceptional accuracy and performance. This sealed bearing is designed to accommodate combined loads (radial and axial) simultaneously, with its 15° contact angle optimizing axial load capacity. Manufactured to a P4 (ABEC-7) tolerance class, it guarantees superior running accuracy. Key advantages include its compact design with a 7 mm width, high-speed capability enabled by a phenolic cage and ceramic balls, and long service life through pre-lubrication and sealing.
Model Code Breakdown
| Code Segment | Technical Meaning | Significance |
|---|---|---|
| S71903 | Bearing series and size designation | Indicates a metric, high-precision angular contact bearing with a 17mm bore. |
| CD | Contact angle and preload designation | Specifies a 15° contact angle and a light preload for high rigidity and precise shaft positioning. |
| HC | Hybrid Ceramic | Signifies the use of ceramic balls, which reduce weight, friction, and heat generation, enabling higher speeds. |
| P4A | Precision Tolerance Class | Denotes manufacturing to P4 (ABEC-7) tolerance, ensuring ultra-precise dimensions and minimal runout for critical applications. |
S71903 CD/HCP4A Bearing Structural Features & Performance Benefits
Hybrid Ceramic Construction: The combination of chrome steel rings and ceramic balls significantly reduces centrifugal forces, lowers operating temperature, and extends bearing life, especially at high speeds.
High Rigidity & Preload: The bearing is supplied with a controlled preload, which increases system stiffness, minimizes deflection under load, and improves rotational accuracy.
Optimized High-Speed Performance: The lightweight phenolic cage and low-friction ceramic balls work in tandem to support a high limiting speed of 63,000 rpm.
Sealed & Lubricated for Life: As a sealed bearing that is pre-lubricated, it is protected from contamination and is typically maintenance-free, reducing total cost of ownership.
S71903 CD/HCP4A Bearing Typical Application Areas
The S71903 CD/HCP4A is ideally suited for high-performance machinery requiring precision and speed, including:
- High-Frequency Spindles for CNC machining centers and PCB drilling machines
- Precision Instrumentation and optical scanners
- High-Speed Motors and turbo-molecular pumps
- Advanced robotics and aerospace actuation systems
