7004 CEGA/HCP4AH1
Hybrid Ceramic Super Precision Bearings
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7004 CEGA/HCP4AH1 Bearing Product Overview & Core Advantages
The 7004 CEGA/HCP4AH1 is a single-row angular contact ball bearing engineered for ultra-high precision applications requiring exceptional rotational accuracy and speed capability. Positioned in the P4A super-precision tolerance class, this bearing delivers superior running accuracy and dimensional stability. Its core advantages include the ability to accommodate combined radial and axial loads in one direction, facilitated by a 15° contact angle. The combination of a ceramic ball material and a phenolic resin cage enables outstanding high-speed performance and thermal stability, making it an ideal choice for demanding, high-rotation machinery.
7004 CEGA/HCP4AH1 Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Significance |
|---|---|---|
| 7004 | Basic Bearing Series & Size | Indicates a metric, 20mm bore, 42mm OD, 12mm width bearing. |
| CE | Contact Angle & Design | Specifies a 15° contact angle, optimized for high-speed operation and axial load capacity. |
| GA | Preload Level | Denotes an Extra Light (Class A) preload, minimizing friction and heat generation for maximum speed. |
| HCP4A | Tolerance & Material Code | H: Indicates the use of ceramic (hybrid) balls. C: Phenolic resin cage. P4A: Super-precision tolerance class. |
7004 CEGA/HCP4AH1 Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Design: The use of ceramic balls significantly reduces centrifugal forces, lowers operating temperature, and extends bearing life, especially under high-speed conditions. This also provides electrical insulation and corrosion resistance.
- High-Speed Phenolic Cage: The phenolic resin cage offers excellent strength-to-weight ratio and operates smoothly with minimal friction at very high rotational speeds (up to 121,000 rpm dmN value).
- Precision & Rigidity: Manufactured to P4A tolerance standards with a very tight bore and OD tolerance of -0.004mm to 0, ensuring minimal runout and high system rigidity for precise positioning.
- Universal Matching (SU): This bearing is universally matchable, allowing two bearings to be mounted in a back-to-back (DB) or face-to-face (DF) arrangement without selective assembly, simplifying installation and providing pre-defined axial rigidity.
- Optimized Load Capacity: The 15° contact angle is ideal for applications requiring high radial dynamic load rating (1667 lbf) combined with moderate axial loads.
7004 CEGA/HCP4AH1 Bearing Typical Application Areas
This high-precision, high-speed angular contact bearing is specifically designed for advanced machinery where accuracy and rotational velocity are critical. Key application areas include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and high-accuracy rotary axes.
- Semiconductor Manufacturing Equipment: Wafer handling robots and precision stages.
- High-Frequency Motors and Spindles: Used in PCB drilling and dental handpieces.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and navigation instruments.
