7002 CEGC/HCP4A
Hybrid Ceramic Super Precision Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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7002 CEGC/HCP4A Bearing Product Overview & Core Advantages
The 7002 CEGC/HCP4A is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and performance. As a single bearing that is Universal Matchable (SU), it can be precisely paired with a second identical bearing to form a preloaded duplex set, offering superior rigidity and rotational accuracy. Its core advantages include a P4A tolerance class for extremely tight dimensional control, a moderate preload (Class C) for optimal stiffness, and the use of ceramic balls which reduce centrifugal forces, lower operating temperatures, and enable high-speed operation up to 127,000 rpm. This combination makes it ideal for applications where high rigidity and minimal runout are critical.
7002 CEGC/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Benefit |
|---|---|---|
| 7002 | Basic bearing series and size designation (15mm bore, 32mm OD, 9mm width). | Defines the compact bearing dimensions. |
| C | 15° contact angle. | Optimized for combined loads, providing excellent thrust capacity. |
| E | Optimized internal geometry (internal design). | Enhances load capacity and high-speed performance. |
| GC | Specifies a moderate preload (Class C). | Increases system rigidity and reduces vibration for improved positional accuracy. |
| HC | Indicates the use of hybrid ceramic balls (Silicon Nitride). | Reduces weight and friction, enabling higher limiting speeds and longer service life. |
| P4A | Specifies a high-precision tolerance class. | Ensures extremely tight running accuracy for applications requiring minimal runout. |
7002 CEGC/HCP4A Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Construction: The combination of chrome steel rings and ceramic balls significantly reduces rolling friction and heat generation. This construction is less sensitive to thermal expansion, maintains preload more consistently, and is suitable for the specified temperature range of -30°C to 110°C.
- Phenolic Resin Cage: The lightweight and robust phenolic cage provides excellent guidance for the ceramic balls, contributing to smooth operation and stability at very high speeds.
- Universal Matching Design (SU): This bearing is manufactured to universal matching standards, allowing it to be mounted in pairs (back-to-back, face-to-face, or tandem) to handle combined radial and axial loads from any direction, significantly increasing system rigidity.
- Optimized Preload: The factory-set moderate preload (Class C) eliminates internal clearance, resulting in higher natural frequency, improved shaft guidance, and enhanced positional accuracy under load.
- Open Seal & Lubrication: The open design allows for custom lubrication schemes to be applied, optimized for the specific application's speed and temperature requirements.
7002 CEGC/HCP4A Bearing Typical Application Areas
The 7002 CEGC/HCP4A is engineered for high-performance systems where speed, precision, and rigidity are paramount. Key application areas include:
- High-Frequency CNC Spindles
- Precision Grinding Machine Spindles
- High-Speed Machining Centers
- Robotic Arm Drives and Precision Gearboxes
- Advanced Medical and Dental Equipment Drives
- Aerospace Instrumentation and Control Systems
