7208 CD/P4ADBB
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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7208 CD/P4ADBB Bearing Product Overview & Core Advantages
The 7208 CD/P4ADBB is a precision duplex angular contact ball bearing designed for applications requiring exceptional rotational accuracy and rigidity. This metric system bearing features a back-to-back (DB) matched arrangement and a P4A super-precision tolerance class, making it ideal for high-speed spindles and other demanding machinery. Its primary advantage lies in its ability to handle combined loads (radial and axial) simultaneously while maintaining high stability and operational precision under light preload (Class B) conditions.
7208 CD/P4ADBB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7208 | Basic bearing series, indicating a 40mm bore, 80mm OD, and 36mm width. |
| C | 15° contact angle, optimized for carrying significant axial loads. |
| D | Indicates the bearing is part of a duplex (matched) set. |
| P4A | Super-precision tolerance class, exceeding ABEC 7/ISO P4 standards for exceptional running accuracy. |
| DB | Back-to-Back arrangement. This configuration provides high moment rigidity and excellent stability under complex load conditions. |
| B | Specifies a light preload (Class B), which minimizes deflection and ensures precise shaft positioning without generating excessive heat. |
7208 CD/P4ADBB Bearing Structural Features & Performance Benefits
Optimized Rigidity and Load Capacity: The duplex back-to-back (DB) arrangement creates a wide effective spread, significantly increasing the bearing's resistance to moment loads and providing high rigidity. This setup, combined with a 15° contact angle, enables the bearing to efficiently support combined radial and axial loads.
High-Speed Capability: The lightweight phenolic resin cage ensures stable operation and reduced centrifugal forces, contributing to the high limiting speed of 41,000 rpm. The open design facilitates efficient lubrication management for cooler running.
Precision Engineering: Manufactured to P4A tolerance class with tight dimensional controls on bore, outside diameter, and width, this bearing guarantees minimal runout and superior rotational accuracy.
Durable Construction: Components made from chrome steel offer high fatigue life and wear resistance, ensuring long-term reliability in demanding applications.
7208 CD/P4ADBB Bearing Typical Application Areas
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Gearboxes: Where high rigidity and accurate shaft alignment are critical.
- High-Frequency Motors and Spindles: Applications requiring ultra-precise rotation at high speeds.
- Medical and Laboratory Equipment: Centrifuges and other precision instruments.
- Robotic Arm Joints and Rotary Tables: For accurate positioning and moment load support.
