7004 CEGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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7004 CEGA/HCP4A Bearing Product Overview & Core Advantages
The 7004 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, it is designed to provide exceptional rotational accuracy, high rigidity, and reliable operation at very high speeds. Its key advantage lies in its ability to support combined loads (radial and axial) simultaneously, making it an ideal choice for high-precision spindles and other critical machinery components. The combination of a ceramic ball material and a phenolic cage further enhances its high-speed capabilities and thermal stability.
7004 CEGA/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Significance |
|---|---|---|
| 7004 | Standard bearing series and size designation. | Indicates a metric bearing with a 20mm bore, 42mm OD, and 12mm width. |
| C | 15° Contact Angle | Optimized for high-speed operation and moderate axial load capacity. |
| E | Optimized internal geometry | Enhanced design for improved performance and lower running torque. |
| GA | Light Preload (Class A) | Provides controlled internal clearance for maximum rigidity and precise shaft positioning. |
| HCP4A | Universal Matchable (SU) set in P4A tolerance | Bearing is one of a pair (2 bearings in set) that can be universally matched in any combination to achieve a specific preload or rigidity, manufactured to the ultra-precise P4A tolerance class. |
7004 CEGA/HCP4A Bearing Structural Features & Performance Benefits
High Precision and Rigidity: Manufactured to the P4A tolerance class with extremely tight dimensional and running accuracy tolerances. The light preload (GA) eliminates internal clearance, resulting in superior shaft guidance and system rigidity, which is critical for minimizing deflection under load.
Exceptional High-Speed Performance: The use of a lightweight phenolic resin cage and low-density ceramic (silicon nitride) balls significantly reduces centrifugal forces, allowing for a limiting speed of 121,000 rpm. This combination also offers superior resistance to thermal expansion and operates effectively within a wide temperature range of -30°C to 110°C.
Optimized Load Capacity: The 15° contact angle is engineered to efficiently handle combined radial and axial loads. With a dynamic load rating of 1667 lbf and a static load rating of 754 lbf, it offers reliable performance in demanding applications.
Universal Matching Capability: Designated as Universal Matchable (SU), these bearings are supplied in sets of two. They can be mounted in any combination (back-to-back, face-to-face, or tandem) to precisely configure the preload and stiffness required for the specific application, offering immense design flexibility.
7004 CEGA/HCP4A Bearing Typical Application Areas
The 7004 CEGA/HCP4A is ideally suited for high-performance machinery where precision, speed, and rigidity are paramount. Key application areas include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling, engraving, and high-frequency motor spindles.
- Robotics: High-accuracy joints and arm actuators.
- Medical Equipment: Dental handpieces and surgical drill spindles.
- Aerospace & Defense: Gyroscopes, navigation systems, and other critical instrumentation.
