7228 ACDGA/P4A
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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7228 ACDGA/P4A Bearing Product Overview & Core Advantages
The 7228 ACDGA/P4A is a single-row angular contact ball bearing designed for high-precision applications requiring exceptional rotational accuracy and rigidity. Engineered to a P4A super-precision tolerance class, this bearing is optimized to handle combined loads, with a specific 25° contact angle that provides superior axial load capacity in one direction. Its extra light preload (Class A) ensures minimal running torque and precise shaft positioning, making it ideal for high-speed spindles and other demanding machinery where high rigidity and minimal deflection are critical. The bearing is supplied pre-lubricated and is part of a universally matchable (SU) set, allowing for flexible arrangement in duplex pairs to handle bidirectional thrust loads.
7228 ACDGA/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| AC | Angular Contact design with a 25° contact angle. |
| DGA | Specific manufacturer designation for a duplex pair, ground for a specific preload and universal matching. |
| P4A | Denotes a super-precision tolerance class, providing extremely tight dimensional and running accuracy for high-performance applications. |
7228 ACDGA/P4A Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: The single-row design, manufactured to P4A tolerances and with an extra light preload, delivers exceptional running accuracy and system stiffness, minimizing deflection under load.
- Optimized Load Capacity: The 25° contact angle is engineered to efficiently support significant axial loads in one direction while also accommodating radial loads, making it suitable for combined load conditions.
- High-Speed Capability: The lightweight phenolic resin cage reduces centrifugal forces, contributing to a high limiting speed of 11,000 rpm. This, combined with the optimized internal geometry, ensures stable performance at high rotational velocities.
- Universal Matching (SU): This bearing is universally matchable, meaning individual bearings can be paired in any combination (back-to-back, face-to-face, or tandem) to create a matched set that meets specific application requirements for preload and rigidity.
- Durable Construction: Manufactured from chrome steel for both rings and balls, ensuring high durability and long service life under demanding operating conditions.
7228 ACDGA/P4A Bearing Typical Application Areas
- Machine Tool Spindles: High-speed milling, grinding, and turning centers where precision and rigidity are paramount.
- Precision Gearboxes: Applications requiring accurate shaft positioning and high rotational speeds.
- High-Frequency Motors and Spindles: Used in applications demanding minimal vibration and high rotational accuracy.
- Medical and Laboratory Equipment: Centrifuges and other precision instruments.
- Aerospace and Defense Systems: Guidance systems and other critical rotational components.
