S7008 CB/P4A
Sealed Super Precision Angular Contact Ball Bearings
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S7008 CB/P4A Bearing Product Overview & Core Advantages
The S7008 CB/P4A is a precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and high rigidity. As a single-row bearing, it excels at supporting combined loads (radial and axial) simultaneously, with its 15° contact angle optimized for high-speed operation. Manufactured to P4 (ABEC-7) tolerance class, it ensures minimal runout and vibration, making it ideal for high-precision, high-reliability machinery. The bearing comes preloaded and pre-lubricated from the factory, simplifying installation and providing immediate, maintenance-free performance.
S7008 CB/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning | Performance Implication |
|---|---|---|
| S | Super-precision bearing series | Denotes bearings manufactured to the highest precision grades (P4/ABEC-7 and above). |
| 7008 | Standard size designation | Indicates a 40 mm bore, 68 mm OD, and 15 mm width. |
| CB | Specific internal clearance and preload | A universal pairing designation, typically indicating a light preload for optimal rigidity and speed. |
| P4A | Tolerance class | Equivalent to ABEC-7, specifying extremely tight dimensional and running accuracy tolerances. |
S7008 CB/P4A Bearing Structural Features & Performance Benefits
- High Rigidity & Precision: The single-row design with a 15° contact angle and factory-applied preload (CB) provides superior shaft positioning accuracy and system stiffness, critical for minimizing deflection under load.
- Optimized Load Capacity: Engineered to handle combined radial and axial loads efficiently. With a dynamic load rating of 1667 lbf and a static load rating of 1260 lbf, it offers reliable performance in demanding conditions.
- Superior High-Speed Performance: The lightweight phenolic resin cage reduces centrifugal forces, while the optimized internal geometry and pre-lubrication contribute to a high limiting speed of 28,000 rpm.
- Sealed & Lubricated for Life: As a sealed bearing, it is protected from contamination. The factory-applied lubricant is suitable for a wide operating temperature range of -30°C to 110°C, ensuring long service life with minimal maintenance.
S7008 CB/P4A Bearing Typical Application Areas
The S7008 CB/P4A is the preferred choice for high-performance applications where precision, speed, and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Gearboxes: Robotics, aerospace, and automotive transmission systems.
- High-Frequency Motors and Spindles: PCB drilling spindles and dental handpieces.
- Medical and Laboratory Equipment: Centrifuges and high-speed scanners.
- Pumps and Compressors: High-speed turbo-molecular pumps and compressors.
