7028 ACD/P4ADT
7000 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7028 ACD/P4ADT
Basic Information
System of measurement
Metric
Weight
6.84 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
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
6.3 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Duplex Tandem (DT)
Number of bearings in matched set
2
Universal matching bearing
No (Standard)
Preload
Available
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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7028 ACD/P4ADT Bearing Product Overview & Core Advantages
The 7028 ACD/P4ADT is a precision angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. This duplex tandem (DT) arrangement consists of two preloaded bearings, enabling it to handle high combined loads—significant radial and unidirectional axial loads—simultaneously. Manufactured to the stringent P4A tolerance class, it offers superior running accuracy and rotational precision. Its compact design and high load capacity make it an ideal solution for high-performance spindles and other precision machinery where high rigidity and reliability are paramount.
7028 ACD/P4ADT Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning | Significance & Advantage |
|---|---|---|
| AC | Angular Contact (25° Contact Angle) | Optimized for carrying combined radial and axial loads efficiently. |
| D | Duplex Tandem (DT) Arrangement | Two bearings are mounted in tandem to increase axial load capacity in one direction and provide high rigidity. |
| P4A | High Precision Tolerance Class | Guarantees extremely tight dimensional and running accuracy, essential for high-speed, high-precision applications. |
| Open (No Seal) | Open bearing design | Allows for custom lubrication schemes and is suitable for applications where external sealing is provided. |
7028 ACD/P4ADT Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The duplex tandem arrangement and the 25° contact angle create an exceptionally rigid bearing system capable of supporting high radial loads (52,650 lbf dynamic) and substantial unidirectional axial loads simultaneously.
- Precision & High-Speed Performance: Manufactured to P4A tolerance class with a phenolic cage, this bearing ensures minimal vibration and stable operation at high rotational speeds, with a limiting speed of 6,300 rpm. The open design facilitates optimal lubrication flow for cooling and high-speed operation.
- Optimized Internal Geometry: Featuring 22 precision balls made of chrome steel with a diameter of 22.225 mm, the bearing is engineered for smooth operation and long service life under heavy loads.
- Preload & Matched Set: Supplied as a preloaded, matched set of two bearings, ensuring immediate optimal performance, simplified installation, and consistent axial and radial stiffness.
7028 ACD/P4ADT Bearing Typical Application Areas
This precision angular contact ball bearing is ideally suited for high-performance applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers requiring extreme accuracy and rigidity.
- Precision Spindles: Applications in PCB drilling, high-frequency motors, and other precision engineering equipment.
- Industrial Pumps & Compressors: Where reliable performance under significant axial and radial loads is critical.
