S7208 CD/P4ADBB
Sealed Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
S7208 CD/P4ADBB
Basic Information
System of measurement
Metric
Weight
0.75 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
80 mm
Outside diameter tolerance
-0.004mm to 0
Width
36 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
11.112 mm
Ball quantity
14
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
12442 lbf
Radial static load rating
10800 lbf
Limiting speed
41 X 1000 rpm
Lubrication
Grease
Matched arrangement
Duplex Back-to-Back (DB)
Number of bearings in matched set
2
Universal matching bearing
No (Standard)
Preload
Light / Class B
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
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In Stock
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S7208 CD/P4ADBB Bearing Product Overview & Core Advantages
The S7208 CD/P4ADBB is a precision angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. This duplex back-to-back (DB) arrangement provides superior stability and can accommodate combined radial and axial loads from both directions. Manufactured to P4A tolerance class, it ensures extremely tight dimensional and running accuracy, making it ideal for high-speed spindles and other precision machinery where minimal runout and high rotational accuracy are critical.
S7208 CD/P4ADBB Bearing Model Code Explained, Specifications & Naming Convention
| Model Segment | Technical Meaning |
|---|---|
| S7 | Bearing series, indicating a specific internal design for high precision and performance. |
| 208 | Standard bore (40 mm) and outside diameter (80 mm) designation. |
| C | Designates a 15° contact angle, optimized for high-speed operation and axial load capacity. |
| D | Indicates the bearing is part of a duplex (paired) set. |
| P4A | The tolerance class, signifying very high precision with tight limits on bore, OD, width, and runout tolerances. |
| DB | Specifies the Back-to-Back arrangement of the duplex pair, providing high moment rigidity. |
S7208 CD/P4ADBB Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The duplex back-to-back (DB) configuration creates a wide effective spread of the load-carrying balls, significantly increasing the bearing's resistance to moment loads and providing exceptional system rigidity.
- Superior Load Capacity: The 15° contact angle and optimized internal geometry enable the bearing to handle significant combined radial and axial loads simultaneously.
- Optimized High-Speed Performance: The lightweight phenolic resin cage reduces centrifugal forces, while the preload class B (Light) minimizes friction and heat generation, allowing for a high limiting speed of 41,000 rpm.
- Precision & Longevity: Manufactured from high-grade chrome steel and held to P4A precision tolerances, this bearing ensures smooth, quiet operation, extended service life, and consistent performance in precision applications.
- Sealed & Pre-Lubricated: The sealed design with grease lubrication protects against contamination and provides long-term, maintenance-free operation within the specified temperature range.
S7208 CD/P4ADBB Bearing Typical Application Areas
This bearing is engineered for high-performance applications, including:
- Machine Tool Spindles: For CNC machining centers, grinding spindles, and other high-precision, high-speed machine tools.
- Precision Gearboxes: Where high rigidity and accurate shaft positioning are required.
- High-Frequency Motors & Spindles: In applications demanding minimal vibration and high rotational accuracy.
- Industrial Pumps & Compressors: For handling axial and radial loads in demanding fluid-handling equipment.
