7008 CD/P4ADFA
7000 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7008 CD/P4ADFA
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 Face-to-Face (DF)
Number of bearings in matched set
2
Universal matching bearing
No (Standard)
Preload
Extra light / Class A
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
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7008 CD/P4ADFA Bearing Product Overview & Core Advantages
The 7008 CD/P4ADFA is a precision duplex angular contact ball bearing designed for applications requiring exceptional rotational accuracy and rigidity. This metric system bearing features a Face-to-Face (DF) matched arrangement and an Extra light (Class A) preload, making it ideal for high-speed spindles and other precision machinery where minimal deflection under combined loads is critical. Its P4A tolerance class ensures superior running accuracy, enabling smooth operation and extended service life in demanding conditions.
7008 CD/P4ADFA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7008 | Basic bearing series and size designation. |
| CD | Indicates a Duplex Face-to-Face (DF) matched arrangement. |
| P4A | Specifies the high precision tolerance class, exceeding ABEC 7 standards. |
| DF | Reinforces the Duplex Face-to-Face mounting configuration. |
| A | Denotes Extra light preload for minimal friction and optimal high-speed performance. |
7008 CD/P4ADFA Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The duplex face-to-face arrangement creates a highly rigid bearing system capable of withstanding combined radial and axial loads from both directions. This configuration significantly increases system stability and reduces shaft deflection under operational stresses.
- Precision Performance: Manufactured to P4A tolerance class with a 15° contact angle, this bearing delivers exceptional running accuracy and smooth operation, which is essential for applications requiring high positional precision.
- High-Speed Capability: The combination of an Extra light preload (Class A) and a lightweight, durable phenolic cage allows for a high limiting speed of 43,000 rpm, minimizing centrifugal forces and operational temperatures.
- Optimized Material Selection: Constructed from chrome steel for both rings and balls, the bearing offers high hardness, wear resistance, and long-term dimensional stability. The phenolic cage contributes to smooth operation at high speeds.
7008 CD/P4ADFA Bearing Typical Application Areas
- Machine Tool Spindles: High-precision milling, grinding, and turning centers.
- High-Speed Machining Centers: Where accuracy and rigidity are paramount.
- Precision Rotary Tables and Indexing Heads.
- High-Frequency Spindles for PCB drilling and engraving.
- Medical and Dental Equipment spindles.
