7028 ACDGA/P4A
7000 Series Super Precision Angular Contact Ball Bearings
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7028 ACDGA/P4A Bearing Product Overview & Core Advantages
The 7028 ACDGA/P4A is a single row angular contact ball bearing designed for applications requiring high precision and exceptional running accuracy. Operating under the P4A tolerance class, it delivers superior dimensional stability and rotational precision. Its key advantage lies in its ability to accommodate combined loads—handling significant radial loads alongside unidirectional axial loads—thanks to its 25° contact angle. Manufactured with chrome steel rings and balls and featuring a phenolic cage, this bearing is optimized for high-speed operation up to 6,300 rpm, making it ideal for demanding, precision-oriented machinery.
7028 ACDGA/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning | Significance & Advantage |
|---|---|---|
| AC | Angular Contact | Designed to support combined radial and axial loads. |
| DGA | Universal Matchable (SU) with Extra Light Preload (Class A) | Bearing is part of a universally matchable set (3 bearings) and comes with a pre-established extra light preload for minimal friction and optimal high-speed performance. |
| P4A | Tolerance Class P4A | Denotes a high-precision bearing with extremely tight dimensional and running accuracy tolerances, superior to standard ABEC 7/ISO P4. |
7028 ACDGA/P4A Bearing Structural Features & Performance Benefits
- High Precision & Rigidity: The P4A tolerance class ensures minimal runout and vibration, providing the dimensional stability required for ultra-precise applications. The single row design, combined with the 25° contact angle, offers excellent rigidity against combined loading.
- Superior Load Capacity: With a dynamic load rating of 32,850 lbf and a static load rating of 35,100 lbf, this bearing is engineered to handle demanding combined loads effectively.
- Optimized High-Speed Performance: The lightweight phenolic cage reduces centrifugal forces, while the open design and high-grade chrome steel construction contribute to a high limiting speed of 6,300 rpm.
- Universal Matching Capability: Designated as Universal Matchable (SU), these bearings can be mounted in tandem, back-to-back, or face-to-face arrangements with other bearings from the same set to achieve specific stiffness and load-sharing characteristics.
7028 ACDGA/P4A Bearing Typical Application Areas
The 7028 ACDGA/P4A is specified for high-performance machinery where precision, speed, and reliability are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Gearboxes and High-Frequency Motors.
- Aerospace & Defense Systems: Gyroscopes, radar equipment, and navigation systems.
- Medical Equipment: High-speed dental handpieces and imaging device rotors.
- Industrial Pumps & Compressors requiring high-speed and precision shaft support.
