7004 FEGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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Main Dimensions
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7004 FEGA/HCP4A Bearing Product Overview & Core Advantages
The 7004 FEGA/HCP4A is a precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and high-speed performance. Manufactured to P4A tolerance class, this bearing delivers superior running accuracy and dimensional stability. Its extra light preload (Class A) minimizes friction and heat generation, making it ideal for high-speed spindles. The combination of a ceramic ball material and phenolic cage contributes to reduced weight, lower centrifugal forces, and enhanced high-speed capability, achieving a limiting speed of 121,000 rpm. This single bearing is universally matchable (SU), allowing for precise duplex arrangements to handle combined loads effectively.
7004 FEGA/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7004 | Basic bearing series designation, indicating a metric bearing size with a 20mm bore, 42mm OD, and 12mm width. |
| FE | Indicates a phenolic resin cage, which is lightweight and suitable for high-speed operation. |
| GA | Specifies an extra light preload (Class A) for minimal starting and running torque. |
| HCP4A | Denotes the tolerance class P4A, signifying very high precision for spindle applications. The "HC" may refer to a specific internal design or material grade. |
7004 FEGA/HCP4A Bearing Structural Features & Performance Benefits
- High-Speed & Rigidity: The phenolic cage and ceramic balls (Si3N4) significantly reduce mass and inertial forces, enabling stable operation at extreme speeds (121,000 rpm) while maintaining system rigidity.
- Precision & Accuracy: Manufactured to P4A tolerance class with tight dimensional controls on bore, outside diameter, and width, ensuring precise fit and minimal runout for superior rotational accuracy.
- Load Handling: The 18° contact angle is optimized to handle combined radial and axial loads efficiently. The universal matchable (SU) design allows for creating preloaded pairs (DB, DF, DT) to increase load capacity and stiffness.
- Thermal & Operational Stability: Ceramic balls have a lower coefficient of thermal expansion than steel, reducing sensitivity to thermal gradients. The open seal type and factory lubrication ensure optimal performance within the specified temperature range (-30°C to 110°C).
7004 FEGA/HCP4A Bearing Typical Application Areas
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Instruments: Measuring devices, optical scanners, and coordinate measuring machines (CMM).
- High-Speed Motors & Drives: Spindles for PCB drilling, dental handpieces, and small turbochargers.
- Aerospace & Defense Systems: Gyroscopes, navigation instruments, and radar equipment.
