7008 FE/HCP4AH1DGA
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
7008 FE/HCP4AH1DGA
Basic Information
System of measurement
Metric
Weight
0.34 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
40 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
68 mm
Outside diameter tolerance
-0.004mm to 0
Width
30 mm
Width tolerance
-0.2mm to 0
Contact angle
18 °
Ball & Washer Dimensions
Ball diameter
7.144 mm
Ball quantity
19
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
4388 lbf
Radial static load rating
3375 lbf
Limiting speed
53 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Universal Matchable (SU)
Number of bearings in matched set
2
Universal matching bearing
Universal Matchable (SU)
Preload
Extra light / Class A
Materials
Ring material
Chrome Steel
Ball material
Ceramic
Cage material
Phenolic
Technical Drawings
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7008 FE/HCP4AH1DGA Bearing Product Overview & Core Advantages
The 7008 FE/HCP4AH1DGA is a high-precision angular contact ball bearing engineered for demanding applications requiring exceptional accuracy and performance. As a universal matchable (SU) bearing supplied in a pre-lubricated, matched pair set, it delivers outstanding rigidity and can accommodate combined radial and axial loads. Its P4A super-precision tolerance and ceramic ball construction make it ideal for high-speed, high-reliability scenarios where minimal runout and thermal stability are critical.
7008 FE/HCP4AH1DGA Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| FE | Indicates a pre-lubricated bearing. |
| HC | Hybrid Ceramic construction, featuring ceramic balls for reduced friction and higher speed capability. |
| P4A | Denotes a super-precision tolerance class (equivalent to ABEC 7), ensuring extremely tight dimensional and running accuracy. |
| H1 | Specifies an extra light preload (Class A), optimizing the bearing for high-speed operation with minimal internal clearance. |
| DGA | Universal Matchable (SU) designation. Two bearings with this suffix can be mounted in any arrangement (back-to-back, face-to-face, or tandem) to achieve the required stiffness and load capacity. |
7008 FE/HCP4AH1DGA Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Design: The combination of chrome steel rings and ceramic (Si3N4) balls significantly reduces friction, heat generation, and wear. This allows for a higher limiting speed (53,000 rpm), increased stiffness, and extended service life compared to all-steel bearings.
- Super-Precision & Preload: Manufactured to P4A tolerance class and assembled with an extra light preload (H1), this bearing provides exceptional running accuracy, reduced vibration, and immediate responsiveness under high-speed rotation.
- Universal Matchability (SU): The DGA suffix ensures that two bearings are precision-matched. This allows for flexible mounting configurations to optimize system rigidity and handle complex combined loads effectively.
- Phenolic Cage: The lightweight and robust phenolic resin cage ensures stable ball guidance at high speeds, contributing to smooth operation and low noise levels.
- Open Seal & Pre-Lubrication: The open design minimizes torque for ultra-high-speed applications, while the factory-applied lubrication ensures immediate startup and reliable initial operation.
7008 FE/HCP4AH1DGA Bearing Typical Application Areas
This bearing is specifically designed for ultra-high-performance machinery, including:
- High-Frequency Machine Tool Spindles
- Precision Grinding Spindles
- High-Speed Robotics and Automation
- Aerospace Actuators and Control Systems
- Medical and Dental Drill Handpieces
- Advanced Semiconductor Manufacturing Equipment
