7028 ACDGB/P4A
7000 Series Super Precision Angular Contact Ball Bearings
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7028 ACDGB/P4A Bearing Product Overview & Core Advantages
The 7028 ACDGB/P4A is a single-row angular contact ball bearing engineered for applications demanding exceptional precision and high-speed performance. Manufactured to the stringent P4A tolerance class, this bearing is designed to primarily accommodate high axial loads in one direction, combined with moderate radial loads. Its 25° contact angle and Universal Matchable (SU) designation make it ideal for preloaded arrangements in pairs or triplex sets, delivering superior rotational accuracy, high rigidity, and reliable operation in demanding environments. The open design and phenolic cage contribute to its high-speed capabilities.
7028 ACDGB/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Significance |
|---|---|---|
| 7028 | Basic Bearing Series & Size | Denotes a metric series bearing with a 140mm bore, 210mm OD, and 33mm width. |
| AC | Angular Contact | Optimized geometry for handling combined (axial and radial) loads. |
| DGB | Contact Angle & Universal Matching | Indicates a 25° contact angle and that the bearing is Universal Matchable (SU), allowing for flexible mounting in preloaded sets. |
| P4A | Tolerance Class | Signifies a high-precision bearing with extremely tight dimensional and running accuracy tolerances, superior to ABEC-7. |
7028 ACDGB/P4A Bearing Structural Features & Performance Benefits
High-Precision Construction: The P4A tolerance class ensures minimal runout and vibration, which is critical for applications requiring smooth, precise rotation. The tight dimensional tolerances on the bore diameter and outside diameter guarantee a perfect fit.
Optimized Load Capacity: The 25° contact angle is engineered to efficiently handle high one-direction axial loads while also supporting significant radial loads. With a dynamic load rating of 32,850 lbf and a static load rating of 35,100 lbf, it offers robust performance under demanding conditions.
Superior High-Speed Performance: The lightweight phenolic cage reduces centrifugal forces, while the open design facilitates efficient lubrication and heat dissipation. This combination allows the bearing to achieve a high limiting speed of 6,300 rpm.
Universal Matching Capability: As a Universal Matchable (SU) bearing, the 7028 ACDGB/P4A can be universally mounted with other SU bearings in back-to-back, face-to-face, or tandem arrangements. This simplifies assembly and enables the creation of highly rigid bearing systems with preload.
7028 ACDGB/P4A Bearing Typical Application Areas
This precision angular contact bearing is ideally suited for high-performance machinery where accuracy, speed, and rigidity are paramount. Key application areas include:
- Machine Tool Spindles: For high-speed milling, grinding, and turning centers.
- High-Frequency Motors and Spindles: Where minimal vibration and high rotational accuracy are required.
- Precision Gearboxes and Robotic Drives: To ensure accurate positioning and smooth motion control.
- Medical and Laboratory Equipment: Such as centrifuges and high-speed scanners.
- Aerospace Actuation Systems: Demanding high reliability and performance under load.
