71904 ACEGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
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Materials
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71904 ACEGA/HCP4A Bearing Product Overview & Core Advantages
The 71904 ACEGA/HCP4A is a super-precision angular contact ball bearing engineered for the most demanding high-speed and high-rigidity applications. Operating under the P4A tolerance class, it delivers exceptional rotational accuracy and running smoothness. Its 25° contact angle is optimized to handle significant combined loads—both radial and axial—simultaneously. Featuring a phenolic resin cage and ceramic balls, this bearing achieves superior limiting speeds while maintaining dimensional stability across a wide temperature range. As a Universal Matchable (SU) bearing supplied in a set of two, it enables precise preload control for optimal system performance.
Model Code Breakdown
| Code Segment | Technical Meaning | Significance |
|---|---|---|
| 71904 | Basic designation: 20mm bore, 37mm OD, 9mm width | Defines the bearing dimensions |
| AC | Angular Contact design | Optimized for combined loads |
| EGA | Extra Light preload / Class A | Minimizes friction and heat generation |
| HC | Hybrid Ceramic (Silicon Nitride balls) | Enables higher speeds and longer service life |
| P4A | Super Precision Tolerance Class | Guarantees exceptional running accuracy |
71904 ACEGA/HCP4A Bearing Structural Features & Performance Benefits
Hybrid Ceramic Construction: The combination of chrome steel rings and silicon nitride (ceramic) balls significantly reduces centrifugal forces, lowers operating temperatures, and extends service life, making it ideal for high-speed applications.
Phenolic Resin Cage: This lightweight, high-strength cage material provides excellent dimensional stability and low friction at high rotational speeds, contributing directly to the bearing's impressive limiting speed of 75,000 rpm.
Precision Engineering: Manufactured to P4A tolerance class with tight dimensional controls on bore, outside diameter, and width, ensuring predictable performance and precise fit in critical assemblies.
Universal Matching (SU): Supplied as a matched set of two bearings, this feature allows for simplified installation and consistent preload establishment, maximizing system rigidity and accuracy.
71904 ACEGA/HCP4A Bearing Typical Application Areas
- High-Speed Machine Tool Spindles: For CNC machining centers, grinding spindles, and milling applications requiring extreme precision and rotational velocity.
- Precision Robotics: In robot arm joints and servo motors where high rigidity and positional accuracy are critical.
- Aerospace & Defense Systems: In gyroscopes, navigation instruments, and other critical flight control mechanisms.
- Medical Equipment: For dental handpieces, surgical drills, and high-speed laboratory centrifuges demanding reliability and contamination control.
- Semiconductor Manufacturing: In wafer handling robots, precision stages, and other cleanroom equipment requiring ultra-precise motion control.
