S71912 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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S71912 ACEGA/HCP4A Bearing Product Overview & Core Advantages
The S71912 ACEGA/HCP4A is a super-precision angular contact ball bearing engineered for applications demanding the highest levels of accuracy and performance. As a single bearing in a universally matchable (SU) set, it is designed to accommodate combined radial and axial loads simultaneously. Its defining characteristics include an extra light preload (Class A) and a P4A tolerance class, ensuring exceptional running accuracy, minimal vibration, and high operational stability. The combination of a phenolic cage and ceramic balls facilitates outstanding high-speed capabilities and reduced rotational inertia, making it ideal for ultra-precise, high-RPM spindles.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| S7 | Series designation for high-precision angular contact ball bearings. |
| 1912 | Bore diameter code (60 mm) and outside diameter series. |
| AC | 25° contact angle, optimized for high axial load capacity. |
| EGA | Internal design code specifying optimized internal geometry and preload. |
| HC | Indicates the use of hybrid ceramic balls (Silicon Nitride). |
| P4A | Super-precision tolerance class, exceeding ABEC 7/ISO P4 standards for enhanced runout and dimensional accuracy. |
S71912 ACEGA/HCP4A Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Construction: The use of ceramic balls with a steel ring significantly reduces centrifugal forces, lowers operating temperature, and extends bearing life, especially under high-speed conditions.
- Phenolic Resin Cage: This lightweight and robust cage material offers excellent dimensional stability and low friction, contributing to smooth operation at the limiting speed of 32,500 rpm.
- Super-Precision P4A Tolerance: Guarantees minimal radial and axial runout, which is critical for applications requiring extreme positional accuracy and reduced vibration.
- Optimized Preload (Class A): The extra light preload ensures high rigidity and precise rotational characteristics from the moment of installation, minimizing deflection under load.
- Sealed & Grease-Lubricated: The sealed design with factory-applied grease protects against contamination and provides long-term, maintenance-free operation within a temperature range of -30°C to 110°C.
S71912 ACEGA/HCP4A Bearing Typical Application Areas
The S71912 ACEGA/HCP4A is specifically designed for the most demanding high-precision and high-speed machinery, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Grinding Spindles: Internal and external grinding applications.
- High-Frequency Motors and High-Speed Routers.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and other precision instruments.
- Semiconductor Manufacturing Equipment: Wafer handling and inspection machines.
