7220 ACDGB/P4A
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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7220 ACDGB/P4A Bearing Product Overview & Core Advantages
The 7220 ACDGB/P4A is a single row angular contact ball bearing engineered for high-precision applications demanding exceptional rotational accuracy and rigidity. Positioned in the P4A super-precision tolerance class, it is designed to handle significant combined loads, primarily heavy thrust loads in one direction, complemented by moderate radial loads. Its optimized internal geometry, featuring a 25° contact angle and phenolic cage, makes it an ideal solution for high-speed spindles and other machinery where superior running accuracy and minimal heat generation are critical.
7220 ACDGB/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Interpretation | Technical Significance |
|---|---|---|
| 7220 | Basic Designation | Specifies the bearing series and size: 100 mm bore, 180 mm OD, 34 mm width. |
| AC | Angular Contact | Designed to support combined radial and axial loads. |
| DGB | Contact Angle & Universal Match | Indicates a 25° contact angle and that the bearing is Universal Matchable (SU), allowing for precise preload setting when mounted in pairs or sets. |
| P4A | Tolerance Class | Denotes super-precision tolerances for bore, outer diameter, and width, ensuring extremely low runout and vibration for high-performance applications. |
7220 ACDGB/P4A Bearing Structural Features & Performance Benefits
High Rigidity and Load Capacity: The 25° contact angle is optimized to support high axial loads in one direction while also accommodating substantial radial loads. This design provides excellent operational stability and system rigidity.
Superior High-Speed Performance: The lightweight and robust phenolic resin cage ensures smooth operation and guides the balls effectively at high rotational speeds, contributing to the high limiting speed of 16,000 rpm. The open design facilitates efficient lubrication and cooling.
Precision Engineering: Manufactured to P4A tolerance class, this bearing guarantees minimal dimensional variation and superior running accuracy, which is paramount for applications like machine tool spindles.
Universal Matching Capability: As a Universal Matchable (SU) bearing, it can be universally paired with other bearings of the same designation in any combination to achieve a specific preload (Light / Class B in this case) without selective mounting, simplifying installation and enhancing performance consistency.
7220 ACDGB/P4A Bearing Typical Application Areas
The 7220 ACDGB/P4A is ideally suited for high-performance machinery requiring precision, speed, and rigidity. Key sectors include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Gearboxes: Especially in high-power, high-speed transmission systems.
- High-Frequency Motors and Spindles: Where low vibration and high running accuracy are critical.
- Aerospace and Defense Equipment: Including gyroscopes and radar systems.
