7008 CD/P4ADT
7000 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7008 CD/P4ADT
Basic Information
System of measurement
Metric
Weight
0.38 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
43 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
Chrome Steel
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 CD/P4ADT Bearing Product Overview & Core Advantages
The 7008 CD/P4ADT is a precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and performance. This duplex tandem (DT) arrangement consists of two matched bearings, preloaded to deliver superior high rigidity and axial stiffness. Engineered to a P4A tolerance class, it is optimized for high-speed operation and can accommodate combined radial and axial loads efficiently. Its compact design and phenolic cage contribute to reliable performance in precision machinery.
7008 CD/P4ADT Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| CD | Indicates a duplex tandem (DT) arrangement with universal matching. The two bearings are mounted in tandem to primarily handle heavy axial loads in one direction. |
| P4A | Denotes a high precision tolerance class with enhanced running accuracy, stricter than ABEC 7 (P4), ensuring minimal vibration and superior performance. |
7008 CD/P4ADT Bearing Structural Features & Performance Benefits
- High Rigidity & Axial Stiffness: The duplex tandem arrangement and available preload create an exceptionally rigid bearing set, minimizing deflection under heavy axial loads and ensuring precise shaft positioning.
- Superior Load Capacity: Designed to handle significant combined loads, with a high 15° contact angle providing excellent axial load-carrying capacity in one direction.
- High-Speed Performance: The lightweight phenolic cage and precision P4A grading allow for a high limiting speed of 43,000 rpm, making it suitable for demanding high-speed spindles.
- Precision & Reliability: Manufactured to P4A tolerance class with tight dimensional control on bore, outside diameter, and width, ensuring smooth, quiet operation and long service life in precision applications.
7008 CD/P4ADT Bearing Typical Application Areas
This bearing is ideally suited for high-precision, high-speed machinery, including:
- Machine Tool Spindles
- High-Frequency Motors
- Precision Grinding Spindles
- Aerospace Control Systems
- Other equipment requiring high rigidity and precise axial positioning.
