7008 ACE/HCP4AH1DT
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
7008 ACE/HCP4AH1DT
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
25 °
Ball & Washer Dimensions
Ball diameter
7.144 mm
Ball quantity
19
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
4275 lbf
Radial static load rating
3218 lbf
Limiting speed
56 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Duplex Tandem (DT)
Number of bearings in matched set
2
Universal matching bearing
No (Standard)
Preload
Available
Materials
Ring material
Chrome Steel
Ball material
Ceramic
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
In Stock
Price available upon request.
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7008 ACE/HCP4AH1DT Bearing Product Overview & Core Advantages
The 7008 ACE/HCP4AH1DT is a precision angular contact ball bearing designed for demanding applications requiring exceptional speed and rigidity. This duplex tandem (DT) matched set is preloaded, delivering superior axial rigidity and enabling it to handle significant combined loads (radial and axial) simultaneously. Manufactured to the exacting P4A tolerance class and featuring a ceramic ball and phenolic cage construction, it is engineered for high-speed operation and reliable performance in precision machinery.
7008 ACE/HCP4AH1DT Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7008 | Basic bearing series and size designation (40mm bore, 68mm OD). |
| ACE | Internal design code specifying a 25° contact angle and optimized internal geometry. |
| HC | Indicates the use of Hybrid Ceramic balls (Silicon Nitride). |
| P4A | Denotes a high-precision tolerance class with enhanced running accuracy. |
| H1 | Specifies a pre-set preload level for immediate high rigidity. |
| DT | Identifies the Duplex Tandem mounting arrangement, where two bearings are matched to carry axial load in the same direction. |
7008 ACE/HCP4AH1DT Bearing Structural Features & Performance Benefits
- High Rigidity & Preload: The duplex tandem (DT) arrangement with factory-set preload eliminates internal clearance, resulting in exceptional system stiffness and precise shaft positioning, critical for minimizing deflection under load.
- Superior High-Speed Performance: The combination of a lightweight phenolic resin cage and low-density ceramic (Si3N4) balls reduces centrifugal forces, lowers operating temperature, and allows for a limiting speed of 56,000 rpm.
- Enhanced Load Capacity: The 25° contact angle is optimized to handle substantial combined radial and axial loads efficiently, making it ideal for applications with complex loading conditions.
- Extended Service Life & Reliability: Hybrid ceramic construction offers superior wear resistance, reduced thermal expansion, and extended lubrication life compared to all-steel bearings, ensuring long-term operational reliability.
7008 ACE/HCP4AH1DT Bearing Typical Application Areas
This high-performance bearing set is ideally suited for advanced machinery where precision, speed, and rigidity are paramount. Key applications include:
- Machine Tool Spindles: High-speed machining centers, grinding spindles, and CNC milling spindles.
- Precision Rotary Systems: High-frequency motors, robotics, and precision measuring instruments.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and auxiliary power units (APUs).
- Semiconductor Manufacturing Equipment: Wafer handling robots and precision stages.
