7008 CD/P4ATBTA
7000 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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7008 CD/P4ATBTA Bearing Product Overview & Core Advantages
The 7008 CD/P4ATBTA is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and rigidity. This bearing is supplied as a matched triplex set in a back-to-back (TBT) arrangement, providing superior stability and moment load capacity. Its P4A tolerance class ensures ultra-precise running accuracy, making it ideal for high-speed spindles and other precision machinery where minimal runout and high system rigidity are critical.
7008 CD/P4ATBTA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7008 | Basic bearing series and size designation (40mm bore, 68mm OD). |
| CD | Specifies a 15° contact angle, optimized for high-speed operation and combined loads. |
| P4A | Indicates an ultra-high precision tolerance class, exceeding ABEC 7 standards. |
| TBT | Denotes a Triplex Back-to-Back matched set of three bearings. |
| A | Signifies an Extra Light preload within the matched set for optimal rigidity and minimal friction. |
7008 CD/P4ATBTA Bearing Structural Features & Performance Benefits
High Rigidity & Stability: The triplex back-to-back arrangement creates a highly rigid bearing system capable of withstanding significant moment loads and complex combined loads, ensuring exceptional positional accuracy of the shaft.
Superior Precision: Manufactured to P4A tolerance class with tight dimensional tolerances on the bore, outside diameter, and width, this bearing guarantees smooth, low-vibration operation essential for high-precision applications.
Optimized High-Speed Performance: The 15° contact angle (CD) and lightweight phenolic resin cage are engineered to minimize centrifugal forces and friction, enabling a high limiting speed of 43,000 rpm.
Premium Material Construction: Manufactured from chrome steel for both rings and balls, the bearing provides high fatigue life and durability. The open design allows for customized lubrication schemes to suit specific operational needs.
7008 CD/P4ATBTA Bearing Typical Application Areas
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Grinding Spindles: Applications requiring the utmost in rotational accuracy.
- High-Frequency Machining Centers: Where high rigidity and damping are critical.
- Industrial Pumps & Compressors: For precise shaft positioning under combined loads.
