7028 ACD/P4AQGB
7000 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7028 ACD/P4AQGB
Basic Information
System of measurement
Metric
Weight
13.7 kg
Tolerance class
P4A
Seal type
Open
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
132 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
84825 lbf
Radial static load rating
141750 lbf
Limiting speed
6.3 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Universal Matchable (SU)
Number of bearings in matched set
4
Universal matching bearing
Universal Matchable (SU)
Preload
Light / Class B
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
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7028 ACD/P4AQGB Bearing Product Overview & Core Advantages
The 7028 ACD/P4AQGB is a precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. Engineered to a P4A tolerance class, it delivers superior running precision. Its 25° contact angle and Universal Matchable (SU) design enable it to handle combined loads efficiently, making it ideal for high-speed spindles and other precision machinery where uncompromising performance and reliability are critical.
7028 ACD/P4AQGB Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| ACD | Angular Contact Design with a 25° contact angle. |
| P4A | Indicates a high-precision tolerance class superior to ABEC 7, ensuring minimal runout and vibration. |
| QGB | Specifies a Light preload (Class B) and Universal Matchable (SU) arrangement, allowing bearings to be mounted in sets (back-to-back, face-to-face, or tandem) without selective shimming. |
7028 ACD/P4AQGB Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The bearing's design and 25° contact angle provide excellent resistance to combined radial and axial loads, ensuring stable operation under demanding conditions.
- Precision & High-Speed Performance: Manufactured to P4A tolerances and featuring a lightweight phenolic cage, this bearing achieves a high limiting speed of 6,300 rpm with minimal friction and heat generation.
- Optimized for Matched Sets: The Universal Matchable (SU) feature allows four bearings to be supplied as a pre-configured set, simplifying installation and ensuring optimal preload and stiffness in the application.
- Superior Material Construction: Made from chrome steel for both rings and balls, the bearing offers high durability and fatigue resistance, contributing to a long service life.
7028 ACD/P4AQGB Bearing Typical Application Areas
This precision angular contact ball bearing is ideally suited for:
- Machine Tool Spindles (High-speed milling, grinding, and turning centers)
- Precision Gearboxes
- High-Frequency Motors
- Industrial Pumps and Compressors
- Aerospace and Defense Positioning Systems
