71902 CEGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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71902 CEGA/HCP4A Bearing Product Overview & Core Advantages
The 71902 CEGA/HCP4A is a single-row angular contact ball bearing engineered for applications demanding ultra-high precision and superior 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 include a 15° contact angle for optimal axial load capacity, a lightweight phenolic resin cage enabling high-speed operation up to 140,000 rpm, and ceramic balls that reduce friction, heat generation, and wear. The bearing is universally matchable (SU), allowing for precise preload control when mounted in pairs, making it an ideal solution for high-rigidity, high-speed spindles.
71902 CEGA/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71902 | Basic bearing designation, indicating a light series, 15mm bore angular contact ball bearing. |
| C | Specifies a 15° contact angle, optimized for high-speed applications with moderate axial loads. |
| E | Indicates an optimized internal design, often including a larger ball complement and reinforced raceways for increased load capacity. |
| GA | Signifies a specific preload group: Extra Light (Class A). This ensures minimal starting and running torque and low heat generation. |
| HC | Denotes the use of Hybrid Ceramic components, specifically ceramic balls running in steel rings. |
| P4A | Defines the tolerance class. P4A is a super-precision grade with extremely tight running accuracy and dimensional tolerances. |
71902 CEGA/HCP4A Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Construction: The combination of chrome steel rings and silicon nitride (Si3N4) ceramic balls significantly reduces centrifugal forces, lowers operating temperature, and extends service life, especially in high-speed applications. This also provides electrical insulation and corrosion resistance.
- High-Speed Phenolic Cage: The lightweight and robust phenolic resin cage ensures excellent dimensional stability and guidance at very high rotational speeds, contributing directly to the bearing's 140,000 rpm limiting speed.
- Precision Ground Raceways: Manufactured to P4A super-precision standards, the raceways guarantee minimal runout and vibration, resulting in smooth, quiet operation and superior machining finish in end applications.
- Universal Matchability (SU): This bearing is supplied as a universally matchable single unit. When two bearings are mounted together in a back-to-back or face-to-face arrangement, they can be preloaded to achieve the exact level of system rigidity and rotational accuracy required.
71902 CEGA/HCP4A Bearing Typical Application Areas
The 71902 CEGA/HCP4A is specifically designed for the most demanding high-precision and high-speed machinery, including:
- Machine Tool Spindles: High-frequency milling, grinding, and turning centers.
- Precision Grinding Spindles: Internal and external grinding applications.
- High-Speed Motors and Drives: Motors for PCB drilling, dental handpieces, and small turbochargers.
- Aerospace & Defense Systems: Gyroscopes, navigation instruments, and radar systems.
- Semiconductor Manufacturing Equipment: Wafer handling robots and precision stages.
