7028 ACD/P4ADBA
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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7028 ACD/P4ADBA Bearing Product Overview & Core Advantages
The 7028 ACD/P4ADBA is a precision duplex angular contact ball bearing designed for applications requiring exceptional rigidity and accuracy. This back-to-back (DB) matched set features an Extra Light (Class A) preload and a P4A tolerance class, making it ideal for high-precision machinery. Its primary advantage lies in its ability to handle combined radial and axial loads simultaneously with high stability, thanks to the optimized 25° contact angle and phenolic cage construction. This configuration ensures minimal deflection under load, providing superior performance in demanding, high-speed environments.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 7028 | Basic bearing designation (140mm bore, 210mm OD) |
| AC | Angular Contact design with 25° contact angle |
| D | Duplex Back-to-Back (DB) arrangement |
| P4A | High precision tolerance class (superior to ABEC 7) |
| DB | Duplex Back-to-Back mounting |
| A | Extra Light preload classification |
7028 ACD/P4ADBA Bearing Structural Features & Performance Benefits
High Rigidity & Precision: The duplex back-to-back configuration creates a rigid bearing system that effectively resists moment loads and shaft deflection. Combined with P4A precision tolerances and extra light preload, this ensures exceptional running accuracy and positional stability.
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 radial dynamic load rating of 52,650 lbf and static load rating of 70,875 lbf demonstrate its robust performance capabilities.
High-Speed Performance: The phenolic cage provides excellent strength-to-weight ratio and smooth operation at high speeds, supporting the limiting speed of 11,000 rpm. The open design facilitates efficient lubrication distribution for optimal thermal management.
Premium Material Construction: Manufactured from chrome steel for both rings and balls, this bearing offers high hardness, wear resistance, and dimensional stability across the operating temperature range of -30°C to 110°C.
7028 ACD/P4ADBA Bearing Typical Application Areas
The 7028 ACD/P4ADBA is specifically engineered for high-precision applications requiring exceptional rigidity and accuracy, including:
- Machine tool spindles for milling, grinding, and turning operations
- High-speed machining centers and precision manufacturing equipment
- Industrial pumps and compressors requiring precise shaft positioning
- Precision gearboxes and transmission systems
- Robotic positioning systems and automation equipment
- Aerospace positioning mechanisms and flight control systems
