7008 CD/HCP4A
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
7008 CD/HCP4A
Basic Information
System of measurement
Metric
Weight
0.17 kg
Tolerance class
P4 (ABEC-7)
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
40 mm
Bore diameter tolerance
-0.006mm to 0
Outside diameter
68 mm
Outside diameter tolerance
-0.007mm 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° to 110 °C
Radial dynamic load rating
3780 lbf
Radial static load rating
2475 lbf
Limiting speed
38 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
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:
$ 214.59
/ each
In Stock
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7008 CD/HCP4A Bearing Product Overview & Core Advantages
The 7008 CD/HCP4A is a high-precision angular contact ball bearing engineered for demanding applications requiring exceptional rotational accuracy and reliability. This single-row bearing features a 15° contact angle and is supplied with a preload, delivering superior high-speed performance and high rigidity. Its construction with a phenolic cage and ceramic balls enables stable operation at the specified limiting speed of 38,000 rpm. Designed to handle combined loads, it efficiently supports substantial axial loads in one direction alongside radial loads, making it an ideal choice for precision machinery and high-performance spindles.
7008 CD/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| CD | Indicates a duplex bearing arrangement with a specific preload. In this context, it signifies the bearing is supplied as a matched set (single) with a preload applied for enhanced stiffness and precision. |
| HC | Refers to Hybrid Ceramic construction, denoting the use of ceramic balls combined with steel rings. This reduces friction, heat generation, and allows for higher speeds. |
| P4 | Specifies the tolerance class (P4 / ABEC-7), indicating very high precision levels for runout and dimensional accuracy. |
7008 CD/HCP4A Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: The preload applied to this angular contact bearing eliminates internal clearance, resulting in significantly increased system rigidity and precise shaft positioning, which is critical for machining accuracy.
- Superior High-Speed Capability: The combination of a lightweight phenolic cage and low-density ceramic balls minimizes centrifugal forces and friction, enabling stable operation at the high limiting speed of 38,000 rpm.
- Enhanced Durability and Performance: Hybrid ceramic construction provides excellent wear resistance, lower operating temperatures, and extended service life compared to all-steel bearings, especially in high-speed applications.
- Optimized Load Capacity: The 15° contact angle is optimized to handle significant combined loads, offering a robust solution for applications with demanding axial and radial load requirements.
7008 CD/HCP4A Bearing Typical Application Areas
This bearing is specifically designed for high-performance applications where speed, precision, and rigidity are paramount. Key industries and equipment include:
- High-Frequency Machine Tool Spindles
- Precision Grinding Spindles
- High-Speed Motors and Turbines
- Advanced Robotics and Automation
- Medical and Dental Equipment Spindles
- Aerospace Instrumentation
