7028 ACD/P4ADBB
7000 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
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Materials
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Product Overview and Core Advantages
The 7028 ACD/P4ADBB is a precision duplex angular contact ball bearing designed for applications requiring exceptional rigidity and accuracy. This matched back-to-back arrangement (DB) provides superior stability when handling combined radial and axial loads. Manufactured to P4A tolerance class, it delivers high running accuracy and is pre-lubricated for immediate use. Its compact design and light preload (Class B) make it ideal for high-precision, high-rigidity applications in demanding environments.
7028 ACD/P4ADBB Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| ACD | Angular Contact Design, 25° contact angle |
| P4A | High precision tolerance class (superior to ABEC 7) |
| DB | Duplex Back-to-Back matched arrangement |
Structural Features and Performance Benefits
Enhanced Rigidity: The duplex back-to-back configuration creates a rigid bearing system that effectively resists moment loads and shaft deflection, ensuring precise rotational accuracy.
Superior Load Capacity: With a 25° contact angle and optimized internal geometry, this bearing efficiently handles combined radial and axial loads in both directions. The dynamic load rating of 52,650 lbf and static load rating of 70,875 lbf demonstrate its robust performance capabilities.
High-Speed Capability: The phenolic cage provides excellent strength-to-weight ratio, contributing to stable operation at high speeds up to 11,000 rpm. The precision-ground chrome steel components ensure smooth rotation and minimal vibration.
Precision Performance: Manufactured to P4A tolerance standards with tight dimensional controls (bore and OD tolerance: -0.004mm to 0), this bearing delivers exceptional running accuracy and consistent performance in precision applications.
7028 ACD/P4ADBB Bearing Typical Application Areas
- Machine Tool Spindles - High-precision machining centers and grinding spindles
- Precision Gearboxes - Industrial transmission systems requiring high rigidity
- Robotic Systems - High-accuracy robotic arms and positioning systems
- Medical Equipment - CT scanners and high-speed medical imaging devices
- Aerospace Systems - Flight control mechanisms and auxiliary power units
- High-Speed Pumps - Chemical processing and industrial pump applications
