S71904 ACEGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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S71904 ACEGA/HCP4A Bearing Product Overview & Core Advantages
The S71904 ACEGA/HCP4A is a single-row angular contact ball bearing designed for applications demanding ultra-high precision and exceptional speed performance. Positioned in the P4A super-precision tolerance class, it delivers superior running accuracy and rotational stability. Its ceramic balls and phenolic resin cage enable significantly higher limiting speeds and reduced operational friction. This bearing is universally matchable, allowing for precise preload control when mounted in pairs, making it an ideal solution for high-rigidity spindles and other demanding machinery.
S71904 ACEGA/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Significance |
|---|---|---|
| S71904 | Basic bearing designation | Indicates a 20mm bore, 37mm OD, 9mm width angular contact bearing. |
| AC | 25° Contact Angle | Optimized for handling combined radial and axial loads. |
| EGA | Extra Light Preload (Class A) | Provides minimal starting torque and is ideal for very high-speed operation. |
| HC | Hybrid Ceramic | Signifies the use of ceramic balls for reduced weight, lower friction, and higher speed capability. |
| P4A | Tolerance Class | Denotes super-precision dimensional and running accuracy, exceeding ABEC 7 standards. |
S71904 ACEGA/HCP4A Bearing Structural Features & Performance Benefits
Hybrid Ceramic Construction: The combination of chrome steel rings and silicon nitride (Si3N4) ceramic balls drastically reduces centrifugal forces, lowers operating temperature, and extends bearing life, especially in high-speed applications.
Phenolic Resin Cage: The lightweight and robust phenolic cage offers excellent dimensional stability and guidance at high rotational speeds, contributing to the bearing's impressive 75,000 rpm limiting speed.
Super-Precision P4A Tolerance: With bore and outside diameter tolerances held within -0.004mm to 0, this bearing ensures minimal runout and vibration, which is critical for achieving superior surface finishes in machining and high positional accuracy.
Universal Matchable Design (SU): This feature allows two bearings to be mounted together in any combination (face-to-face, back-to-back, or tandem) to create a stiff, preloaded bearing set capable of handling complex combined loads.
S71904 ACEGA/HCP4A Bearing Typical Application Areas
The S71904 ACEGA/HCP4A is engineered for the most demanding high-speed and high-precision machinery, including:
- High-Frequency CNC Spindles for milling, grinding, and drilling
- Precision Machine Tool Main Shafts
- High-Speed Robotic Drives and Actuators
- Advanced Dental and Medical Handpieces
- Aerospace Instrumentation and Gyroscopes
