7008 CD/HCP4ADGC
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
7008 CD/HCP4ADGC
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
15 °
Ball & Washer Dimensions
Ball diameter
7.938 mm
Ball quantity
18
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
6210 lbf
Radial static load rating
4950 lbf
Limiting speed
41 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Universal Matchable (SU)
Number of bearings in matched set
2
Universal matching bearing
Universal Matchable (SU)
Preload
Moderate / Class C
Materials
Ring material
Chrome Steel
Ball material
Ceramic
Cage material
Phenolic
Technical Drawings
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In Stock
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7008 CD/HCP4ADGC Bearing Product Overview & Core Advantages
The 7008 CD/HCP4ADGC is a high-precision angular contact ball bearing engineered for demanding applications requiring exceptional rotational accuracy and rigidity. This universal matchable bearing is supplied as a pre-set pair (SU arrangement), delivering superior performance in handling combined loads—simultaneously supporting significant radial and axial loads. Its ceramic ball construction and P4A super-precision tolerance class make it an ideal solution for high-speed spindles and other precision machinery where minimal runout and thermal stability are critical.
7008 CD/HCP4ADGC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7008 | Basic bearing series, 40mm bore, 68mm OD, 30mm width |
| CD | Universal matchable bearing design (can be paired in any combination) |
| HCP4A | High-precision designation with P4A tolerance class and enhanced running accuracy |
| DGC | Specifies ceramic balls and phenolic cage construction |
7008 CD/HCP4ADGC Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The paired angular contact bearing arrangement creates a rigid support system capable of handling heavy combined radial and axial loads from multiple directions.
- Exceptional High-Speed Performance: The combination of ceramic balls (reduced centrifugal forces) and phenolic cage enables operation at limiting speeds up to 41,000 rpm with minimal friction and heat generation.
- Precision Engineering: Manufactured to P4A super-precision standards with tight dimensional tolerances (bore/OD: -0.004mm to 0) for applications requiring extreme running accuracy and minimal vibration.
- Thermal Stability: The 15° contact angle and optimized internal geometry provide stable preload characteristics across the operating temperature range (-30°C to 110°C).
- Moderate Preload (Class C): Factory-set preload ensures consistent performance without requiring additional adjustment during installation.
7008 CD/HCP4ADGC Bearing Typical Application Areas
- Machine Tool Spindles: High-speed machining centers, grinding spindles, and CNC milling machines
- Precision Instrumentation Semiconductor manufacturing equipment, measuring instruments, and optical systems
- High-Speed Motors: Servo motors, spindle motors, and other high-RPM industrial drives
- Aerospace Components: Gyroscopes, navigation systems, and auxiliary power units
- Medical Equipment: Dental handpieces, laboratory centrifuges, and imaging system rotors
