7008 ACE/HCP4AL1DT
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
7008 ACE/HCP4AL1DT
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
Price:
$ 382.39
/ each
In Stock
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7008 ACE/HCP4AL1DT Bearing Product Overview & Core Advantages
The 7008 ACE/HCP4AL1DT is a high-precision duplex tandem angular contact ball bearing designed for applications requiring exceptional accuracy and rigidity. This matched bearing set features a P4A super-precision tolerance class and is preloaded for immediate, high-stiffness operation. Its ability to handle combined radial and axial loads simultaneously makes it ideal for high-speed, high-rigidity spindles and other precision machinery where positional accuracy is critical. The combination of a ceramic ball material and phenolic cage contributes to superior high-speed performance and reduced rotational mass.
7008 ACE/HCP4AL1DT Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Significance |
|---|---|---|
| 7008 | Basic Bearing Series & Size | Denotes a 40mm bore, 68mm OD, 30mm width bearing. |
| ACE | Internal Design & Contact Angle | Specifies a 25° contact angle and optimized internal geometry for high-speed operation. |
| HC | Hybrid Ceramic | Indicates the use of ceramic balls for reduced friction, higher speed capability, and longer service life. |
| P4A | Tolerance Class | Specifies super-precision dimensional and running accuracy, superior to ABEC 7. |
| L1 | Light Preload | The bearing set is supplied with a light preload to eliminate internal clearance, ensuring maximum system rigidity. |
| DT | Duplex Tandem Arrangement | Two bearings are matched and mounted in tandem to primarily handle axial loads in one direction, increasing axial load capacity and stiffness. |
7008 ACE/HCP4AL1DT Bearing Structural Features & Performance Benefits
- Superior Rigidity and Preload: The duplex tandem (DT) arrangement and built-in light preload (L1) create an exceptionally rigid bearing system that minimizes deflection under load, crucial for maintaining precision in machining and positioning applications.
- Enhanced High-Speed Performance: The hybrid ceramic design (HC) with silicon nitride balls significantly reduces centrifugal forces and friction, enabling a high limiting speed of 56,000 rpm. The lightweight phenolic cage further supports stable, high-speed rotation.
- High Load Capacity: The 25° contact angle and tandem configuration are optimized to handle significant axial loads in one direction, while also supporting substantial radial loads.
- Precision and Accuracy: Manufactured to P4A super-precision tolerances, this bearing ensures minimal runout and vibration, which is essential for applications demanding the highest levels of accuracy and surface finish.
- Optimized for Lubrication: The open seal type allows for optimal lubrication flow and is supplied lubricated, ready for integration into systems with centralized or oil-mist lubrication.
7008 ACE/HCP4AL1DT Bearing Typical Application Areas
This high-performance duplex tandem angular contact ball bearing is engineered for the most demanding applications:
- High-Speed Machine Tool Spindles: For CNC milling, grinding, and precision lathes where high rigidity and speed are paramount.
- Precision Spindles: In PCB drilling, dental handpieces, and other small, high-speed tools.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and other instrumentation requiring high precision and reliability.
- High-Frequency Motors: Spindle motors and other electric motors operating at very high rotational speeds.
