71912 CEGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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71912 CEGA/HCP4A Bearing Product Overview & Core Advantages
The 71912 CEGA/HCP4A is a single-row angular contact ball bearing engineered for applications demanding the highest levels of precision and performance. Positioned in the P4A super-precision tolerance class, this bearing is designed to handle combined loads with exceptional accuracy and rotational stability. Its core advantages stem from a 15° contact angle and the use of ceramic balls, which significantly reduce centrifugal forces and heat generation, enabling superior high-speed capabilities up to 31,000 rpm. The combination of a lightweight phenolic cage and universal matching designation (SU) makes it ideal for high-rigidity, preloaded arrangements in the most demanding machinery.
71912 CEGA/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Significance |
|---|---|---|
| 71912 | Basic bearing series and size designation | Defines the core dimensions: 60mm bore, 85mm OD, 13mm width. |
| C | 15° contact angle | Optimized for high-speed operation and moderate axial load capacity. |
| E | Optimized internal design | Enhanced internal geometry for improved performance and load rating. |
| GA | Light preload (Class A) | Provides minimal internal clearance for high rigidity and precise shaft positioning. |
| HC | Hybrid Ceramic | Indicates the use of ceramic balls with steel rings for high-speed and long life. |
| P4A | Tolerance Class | Denotes super-precision levels for runout and dimensional accuracy. |
71912 CEGA/HCP4A Bearing Structural Features & Performance Benefits
Hybrid Ceramic Construction: The use of silicon nitride ceramic balls provides significant performance benefits. Ceramic balls are lighter and harder than steel, drastically reducing centrifugal loading and wear. This results in lower operating temperatures, reduced friction, and substantially higher limiting speeds.
Phenolic Resin Cage: The lightweight and robust phenolic cage offers excellent dimensional stability and guidance under high-speed rotation and temperature variations, contributing to smooth operation and extended service life.
Precision & Rigidity: Manufactured to P4A tolerance class and supplied with a light preload (GA), this bearing ensures minimal runout and high system rigidity. This is critical for applications requiring exceptional rotational accuracy and resistance to operational deflection.
Universal Matchable (SU): This bearing is universally matchable, meaning any two bearings can be paired in a duplex set (e.g., DB or DF) without selective assembly, simplifying installation and ensuring optimal preload and performance.
71912 CEGA/HCP4A Bearing Typical Application Areas
The 71912 CEGA/HCP4A is specified for high-performance machinery where speed, precision, and reliability are non-negotiable. Key application areas include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling and routing equipment.
- High-Frequency Motors: Spindles for CNC applications.
- Aerospace & Defense Systems: Gyroscopes, navigation instruments, and auxiliary power units.
- Medical Equipment: High-speed dental handpieces and laboratory centrifuges.
