7008 CEGA/HCP4A
Hybrid Ceramic Super Precision Bearings
Image may differ from product. See technical specification for details.
Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
- Fast delivery
- Free shipping on orders over $200
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
7008 CEGA/HCP4A Bearing Product Overview & Core Advantages
The 7008 CEGA/HCP4A is a high-precision, single-row angular contact ball bearing engineered for superior performance in demanding applications. Its defining characteristic is the use of ceramic balls, which significantly enhances its operational capabilities. This bearing is designed to handle high combined loads (radial and axial) simultaneously and is optimized for high-speed operation. Manufactured to the exacting P4A tolerance class and featuring a Universal Matchable (SU) designation, it offers exceptional running accuracy, rigidity, and reliability for the most critical machinery.
7008 CEGA/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Benefit |
|---|---|---|
| 7008 | Standard bore diameter (40 mm) and series designation. | Defines the core bearing dimensions. |
| CE | Hybrid bearing with ceramic balls and steel rings. | Reduced weight, lower friction, higher speed capability, and non-conductive properties. |
| GA | Preload: Extra light (Class A). | Minimizes friction and heat generation, ideal for very high-speed applications requiring high precision. |
| HC | High Capacity internal geometry. | Increased dynamic load rating for longer service life under heavy loads. |
| P4A | Tolerance class superior to ABEC 7/ISO P4. | Guarantees extremely tight dimensional and running accuracy for superior performance in precision systems. |
7008 CEGA/HCP4A Bearing Structural Features & Performance Benefits
Hybrid Ceramic Design: The use of silicon nitride (ceramic balls) with steel rings results in a bearing with significantly lower density, reduced centrifugal forces, and higher stiffness. This directly translates to a higher limiting speed (56,000 rpm), reduced operating temperature, and extended lubricant life.
High-Precision Construction: Manufactured to P4A tolerances, this bearing ensures minimal runout and vibration, which is critical for maintaining accuracy in high-speed spindles and precision instruments.
Optimized Internal Geometry (HC): The High Capacity design features a larger ball complement and optimized raceway curvature, providing a higher radial dynamic load rating (2790 lbf) for its compact bearing size (40x68x15 mm).
Phenolic Cage: The lightweight and robust phenolic resin cage offers excellent dimensional stability at high speeds and is well-suited for the demanding conditions created by the ceramic balls.
Universal Matching (SU): This bearing is supplied as a Universal Matchable single bearing, allowing for easy and precise arrangement in pairs (DB, DF, DT) to handle complex load configurations without additional selection or machining.
7008 CEGA/HCP4A Bearing Typical Application Areas
The 7008 CEGA/HCP4A is the bearing of choice for ultra-high-speed and high-precision machinery where reliability and accuracy are paramount.
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Instruments: Measuring and testing equipment.
- High-Frequency Motors & Spindles: PCB drilling spindles and dental handpieces.
- Aerospace & Defense Systems: Gyroscopes, navigation systems, and auxiliary power units.
- Turbochargers and Compressors: Applications requiring high rotational speeds and reliability.
