7008 CEGB/HCP4A
Hybrid Ceramic Super Precision Bearings
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7008 CEGB/HCP4A Bearing Product Overview & Core Advantages
The 7008 CEGB/HCP4A is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. Engineered to a P4A super-precision tolerance class, this single bearing features a 15° contact angle and is universally matchable (SU designation), allowing for precise preload control when paired with a second, identical bearing. Its core advantages include the ability to accommodate combined loads (radial and axial), superior high-speed performance facilitated by a phenolic cage and ceramic balls, and outstanding operational reliability within a wide temperature range.
7008 CEGB/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7008 | Basic bearing series and size designation (40mm bore, 68mm OD, 15mm width). |
| C | Specifies a 15° contact angle. |
| E | Indicates optimized internal design and high-precision grinding. |
| GB | Signifies a Light preload / Class B. |
| HC | Denotes the use of Hybrid Ceramic components (ceramic balls with steel rings). |
| P4A | The tolerance class, representing superior dimensional and running accuracy exceeding ABEC 7. |
7008 CEGB/HCP4A Bearing Structural Features & Performance Benefits
Hybrid Ceramic Construction: The combination of chrome steel rings and silicon nitride (Si3N4) ceramic balls significantly reduces friction, heat generation, and wear. This construction enables higher limiting speeds, extended service life, and is suitable for applications where electrical arcing is a concern.
Phenolic Resin Cage: The lightweight and robust phenolic cage contributes to exceptional high-speed stability and low vibration, which is critical for maintaining precision at the limiting speed of 56,000 rpm.
Precision & Rigidity: Manufactured to P4A tolerance standards with a Light preload, this bearing delivers minimal runout and high system rigidity, ensuring precise positioning and repeatability under combined loads.
Universal Matching (SU): This bearing is universally matchable, meaning any two 7008 CEGB/HCP4A bearings can be paired in a duplex set (DB, DF, or DT) without selective assembly, simplifying installation and achieving the desired preload for optimal performance.
7008 CEGB/HCP4A Bearing Typical Application Areas
The 7008 CEGB/HCP4A is ideally suited for high-performance machinery requiring superior precision and speed. Key application areas include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling and routing equipment.
- High-Frequency Motors: Spindles for electric vehicles and industrial automation.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and navigation instruments.
- Medical Equipment: High-speed dental handpieces and laboratory centrifuges.
