S71904 ACD/HCP4A
Hybrid Ceramic Super Precision Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
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S71904 ACD/HCP4A Bearing Product Overview & Core Advantages
The S71904 ACD/HCP4A is a high-precision angular contact ball bearing designed for applications demanding exceptional accuracy and reliability. As a single-row bearing with P4 (ABEC-7) tolerance class, it is engineered to provide superior rotational precision. Its key advantage lies in its ability to accommodate combined loads—simultaneously handling significant radial loads and axial loads in one direction. The combination of a ceramic ball material and a phenolic cage contributes to its high-speed capabilities and reduced weight, making it an ideal solution for compact, high-performance machinery requiring high rigidity and low friction.
S71904 ACD/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning | Benefit |
|---|---|---|
| ACD | 25° Contact Angle | Optimized for carrying high axial loads in one direction. |
| HC | Hybrid Ceramic (Silicon Nitride Balls) | Enables higher speeds, reduces friction and heat generation, and increases bearing life. |
| P4A | ABEC-7 / ISO P4 Tolerance Class | Guarantees extremely tight dimensional and running accuracy for superior performance. |
S71904 ACD/HCP4A Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: Manufactured to P4 tolerance class with a 25° contact angle, this bearing provides a stiff and precise rotational element, minimizing deflection under load.
- Superior High-Speed Performance: The lightweight phenolic resin cage and low-density ceramic balls significantly reduce centrifugal forces, allowing for a high limiting speed of 48,000 rpm.
- Enhanced Durability and Life: Hybrid ceramic construction offers excellent wear resistance and electrical insulation properties, leading to extended service life, especially in demanding environments.
- Pre-lubricated and Sealed: The bearing comes lubricated and sealed from the factory, protecting against contamination and ensuring consistent performance from installation.
S71904 ACD/HCP4A Bearing Typical Application Areas
- High-Frequency Spindles for PCB drilling and milling
- Precision Machine Tool main shafts
- High-Speed Motors and encoders
- Medical and Dental Handpieces
- Aerospace Instrumentation and control systems
