S7028 ACD/P4ADGC
Sealed Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
S7028 ACD/P4ADGC
Basic Information
System of measurement
Metric
Weight
6.89 kg
Tolerance class
P4A
Seal type
Sealed
For load direction
Angular Contact
Main Dimensions
Bore diameter
140 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
210 mm
Outside diameter tolerance
-0.004mm to 0
Width
66 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
22.225 mm
Ball quantity
22
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
52650 lbf
Radial static load rating
70875 lbf
Limiting speed
11 X 1000 rpm
Lubrication
Grease
Matched arrangement
Universal Matchable (SU)
Number of bearings in matched set
2
Universal matching bearing
Universal Matchable (SU)
Preload
Moderate / Class C
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
In Stock
Price available upon request.
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S7028 ACD/P4ADGC Bearing Product Overview & Core Advantages
The S7028 ACD/P4ADGC is a precision double row angular contact ball bearing designed for applications requiring exceptional rigidity and accuracy. Engineered to simultaneously handle combined radial and axial loads from both directions, this bearing offers a compact and robust solution. Its P4A tolerance class ensures ultra-precise running accuracy, making it ideal for high-speed spindles and other demanding machinery where high rigidity and reliability are paramount.
Model Code Breakdown
| Suffix Code | Technical Meaning |
|---|---|
| ACD | Angular Contact Design with a 25° contact angle, optimized for combined loads. |
| P4A | High precision tolerance class, exceeding ABEC 7/ISO P4 standards for superior running accuracy. |
| DGC | Indicates the bearing is part of a universally matchable (SU) pair with a moderate preload (Class C). |
S7028 ACD/P4ADGC Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The double row design provides superior radial and axial stiffness, enabling stable performance under heavy combined loads. The 25° contact angle is optimally balanced for thrust capacity.
- Precision & High-Speed Performance: The phenolic cage and P4A precision grading contribute to smooth operation and low vibration, supporting a high limiting speed of 11,000 rpm. The optimized internal geometry minimizes friction and heat generation.
- Sealed & Pre-lubricated: As a sealed bearing pre-filled with grease, it is protected from contamination and offers long-term, maintenance-free operation within its specified temperature range.
- Universal Matchability (SU): These bearings are supplied as a matched set of 2, designed for universal mounting (arranged back-to-back, face-to-face, or tandem) to create a pre-loaded bearing system without the need for selective assembly.
S7028 ACD/P4ADGC Bearing Typical Application Areas
This bearing is engineered for high-performance applications, including:
- Machine Tool Spindles (e.g., milling, grinding, and turning centers)
- High-frequency Precision Spindles
- High-Speed Compressors and Pumps
- Precision Robotics and Automation Equipment
