7208 ACD/P4ADT
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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7208 ACD/P4ADT Bearing Product Overview & Core Advantages
The 7208 ACD/P4ADT is a precision angular contact ball bearing supplied as a matched duplex tandem (DT) set. Engineered to the exacting P4A tolerance class, it delivers exceptional running accuracy and rotational stability. Its primary advantage lies in its ability to handle combined loads—specifically high axial loads in one direction—making it an ideal choice for applications demanding high rigidity and precise shaft positioning. The preloaded tandem arrangement ensures minimal axial play and is optimized for high-speed operation up to 41,000 rpm.
7208 ACD/P4ADT Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7208 | Basic bearing series, indicating a 40mm bore, 80mm OD, and 36mm width. |
| AC | Angular Contact design with a 25° contact angle. |
| D | The bearing is supplied as one half of a Duplex pair. |
| P4A | Indicates a high-precision tolerance class, with enhanced dimensional and running accuracy. |
| DT | Duplex Tandem arrangement. Two bearings are matched to share the axial load in the same direction. |
7208 ACD/P4ADT Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The duplex tandem arrangement and 25° contact angle create an exceptionally rigid system capable of supporting high axial loads in one direction. The dynamic load rating of 11,700 lbf ensures reliable performance under demanding conditions.
- Optimized High-Speed Performance: The lightweight phenolic cage reduces centrifugal forces, while the precision-ground chrome steel components minimize vibration, collectively enabling stable operation at the limiting speed of 41,000 rpm.
- Precision Engineering: Manufactured to P4A tolerance class with tight bore, OD, and width tolerances, this bearing guarantees superior running accuracy and minimal rotational runout for critical applications.
- Preload & Stability: The bearings are supplied with a preload, eliminating internal clearance for immediate high rigidity and precise shaft positioning without the need for initial adjustment.
7208 ACD/P4ADT Bearing Typical Application Areas
The 7208 ACD/P4ADT is specifically designed for high-performance machinery where precision, speed, and rigidity are paramount. Key applications include:
- Machine Tool Spindles (e.g., milling, grinding, and machining centers)
- High-Frequency Spindles
- Precision Gearboxes
- Industrial Pumps and Compressors
- Robotic Drives and Precision Axes
