7004 CEGB/HCP4A
Hybrid Ceramic Super Precision Bearings
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Main Dimensions
Ball & Washer Dimensions
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7004 CEGB/HCP4A Bearing Product Overview & Core Advantages
The 7004 CEGB/HCP4A is a high-precision angular contact ball bearing designed for applications demanding exceptional accuracy and performance. This single bearing is part of a universally matchable (SU) set, allowing for precise preload control when paired. Its core advantages include the ability to handle combined radial and axial loads, facilitated by a 15° contact angle. Manufactured to a P4A tolerance class, it guarantees superior running accuracy and high system rigidity, making it ideal for high-speed spindles and other precision machinery.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 7004 | Basic bearing series, indicating a 20mm bore, 42mm OD, and 12mm width. |
| C | 15° nominal contact angle. |
| E | Optimized internal design and P4A tolerance class. |
| GB | Light preload (Class B). |
| HC | Hybrid Ceramic: Chrome steel rings with ceramic balls. |
| P4A | High precision tolerance class exceeding ABEC 7. |
7004 CEGB/HCP4A Bearing Structural Features & Performance Benefits
Hybrid Ceramic Construction: The combination of steel rings and ceramic balls (Si3N4) significantly reduces friction, heat generation, and wear. This construction enables higher limiting speeds (121,000 rpm) and provides electrical insulation, extending bearing service life.
Phenolic Resin Cage: The lightweight and robust phenolic cage ensures excellent dimensional stability and low centrifugal forces at high rotational speeds, contributing to smooth operation and reduced vibration.
Universal Matching (SU): This bearing is universally matchable, meaning any two bearings can be paired in a duplex set to achieve a defined light preload without selective mounting, simplifying installation and ensuring consistent, high-performance operation.
High-Precision & Rigidity: The P4A tolerance class and precise 15° contact angle deliver exceptional running accuracy and system rigidity, which is critical for applications requiring minimal runout and high positional accuracy.
7004 CEGB/HCP4A Bearing Typical Application Areas
The 7004 CEGB/HCP4A is engineered for the most demanding high-speed and high-precision applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling and routing spindles.
- High-Frequency Motors: Spindles for aerospace and automotive testing.
- Medical Equipment: High-speed dental handpieces and surgical tools.
- Robotics: Precision joints and arms requiring high rigidity and speed.
