7008 CDGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
7008 CDGA/HCP4A
Basic Information
System of measurement
Metric
Weight
0.17 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
15 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
7.938 mm
Ball quantity
18
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
3780 lbf
Radial static load rating
2475 lbf
Limiting speed
43 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Number of bearings in matched set
3
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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In Stock
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7008 CDGA/HCP4A Bearing Product Overview & Core Advantages
The 7008 CDGA/HCP4A is a high-precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. As a single bearing with an extra light preload (Class A), it delivers smooth operation and minimal deflection under load. Its ceramic balls and phenolic cage contribute to superior high-speed performance and reduced weight. This bearing is universally matchable (SU), allowing for precise axial play adjustment when mounted with other bearings, making it ideal for high-precision spindles and other critical machinery.
7008 CDGA/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| CDGA | Indicates a universally matchable bearing designed with a 15° contact angle. When mounted with other bearings, they can be arranged to achieve a specific preload or axial clearance. |
| HCP4A | Denotes the tolerance class P4A, which specifies extremely tight dimensional and running accuracy tolerances, exceeding standard ABEC 7 / ISO P4 levels for superior precision. |
7008 CDGA/HCP4A Bearing Structural Features & Performance Benefits
- High Rigidity & Precision: The P4A tolerance class ensures minimal runout and vibration, providing stable and accurate rotation essential for precision machining.
- High-Speed Capability: The combination of ceramic balls (lower density, reduced centrifugal force) and a lightweight phenolic cage enables a high limiting speed of 43,000 rpm.
- Superior Load Capacity: The 15° contact angle is optimized to handle combined radial and axial loads simultaneously, with a dynamic load rating of 3780 lbf.
- Thermal Stability: The phenolic cage and ceramic balls offer stable performance across the specified temperature range from -30°C to 110°C.
- Matched Set Flexibility: As a universally matchable (SU) bearing, it can be supplied in sets (3 bearings in a matched set) for simplified assembly and optimal preload control in complex arrangements.
7008 CDGA/HCP4A Bearing Typical Application Areas
This bearing is engineered for high-performance applications where speed, precision, and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and high-accuracy actuators.
- Medical Equipment: Dental handpieces and laboratory centrifuges.
- Aerospace Systems: Gyroscopes and navigation instruments.
- High-Frequency Motors: Spindles for PCB drilling and routing.
