S7008 CD/P4ADT
Sealed Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
S7008 CD/P4ADT
Basic Information
System of measurement
Metric
Weight
0.39 kg
Tolerance class
P4A
Seal type
Sealed
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
41 X 1000 rpm
Lubrication
Grease
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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S7008 CD/P4ADT Bearing Product Overview & Core Advantages
The S7008 CD/P4ADT is a precision duplex tandem angular contact ball bearing designed for high-performance applications requiring exceptional rigidity and accuracy. This matched pair bearing set features a 15° contact angle and is preloaded for immediate operational stability. Its primary advantage lies in its ability to handle combined radial and axial loads simultaneously in one direction with superior precision, making it ideal for high-speed spindles and other demanding machinery where minimal deflection and high rotational accuracy are critical.
S7008 CD/P4ADT Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| S7008 | Basic bearing series and size designation (40mm bore, 68mm OD). |
| C | 15° contact angle design. |
| D | Duplex arrangement. |
| P4A | High precision tolerance class, exceeding standard ABEC-7/ISO P4 levels for enhanced running accuracy. |
| DT | Duplex Tandem mounting configuration. Two bearings are matched and mounted in tandem to primarily increase axial load capacity in one direction. |
S7008 CD/P4ADT Bearing Structural Features & Performance Benefits
- High Rigidity & Preload: The duplex tandem (DT) arrangement and factory-applied preload eliminate internal clearance, resulting in a very stiff bearing system that minimizes shaft deflection under load, crucial for high-precision machining.
- Superior Load Capacity: The tandem setup is engineered to share and significantly increase the axial load carrying capacity in one direction, while the angular contact design efficiently handles combined loads.
- Optimized High-Speed Performance: The lightweight phenolic resin cage reduces centrifugal forces, and the precision-ground chrome steel components contribute to smooth operation, enabling a high limiting speed of 41,000 rpm.
- Sealed & Lubricated for Life: As a sealed bearing, it is filled with grease and protected from contamination, offering a maintenance-free solution within its specified temperature range (-30°C to 110°C).
S7008 CD/P4ADT Bearing Typical Application Areas
This bearing is specifically designed for high-performance applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling, engraving, and high-frequency motor spindles.
- Axial Load-Dominant Machinery: Certain pumps and compressors requiring high unidirectional thrust capacity.
