7028 ACD/P4ADGB
7000 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7028 ACD/P4ADGB
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
11 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Universal Matchable (SU)
Number of bearings in matched set
2
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
Price available upon request.
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7028 ACD/P4ADGB Bearing Product Overview & Core Advantages
The 7028 ACD/P4ADGB is a precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. As a universal matchable (SU) bearing supplied in a preloaded pair (DB arrangement), it delivers superior performance in handling combined radial and axial loads. Manufactured to a P4A tolerance class, it ensures minimal runout and high positional accuracy, making it ideal for high-speed spindles and other precision machinery where reliability is critical.
7028 ACD/P4ADGB Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| ACD | Angular Contact Design with a 25° contact angle, optimized for high axial load capacity. |
| P4A | High-Precision Tolerance Class, providing extremely tight dimensional and running accuracy exceeding ABEC 7/ISO P4. |
| DB | Universal Matchable (SU) bearing pair supplied in a Back-to-Back (DB) arrangement, offering high moment stiffness. |
7028 ACD/P4ADGB Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The 25° contact angle and universal matching (SU) design enable the bearing pair to withstand significant combined radial and axial loads from both directions, providing exceptional system stiffness.
- Precision & High-Speed Performance: Manufactured to P4A tolerance standards with a phenolic resin cage, this bearing ensures smooth operation and stability at high rotational speeds, with a limiting speed of 11,000 rpm.
- Optimized Material & Construction: Components made from chrome steel offer high durability and fatigue resistance. The open design allows for customized lubrication schemes to suit specific application needs.
- Preloaded Pair: Supplied as a Light Preload (Class B) matched set, eliminating internal clearance for immediate high precision and reduced vibration upon installation.
7028 ACD/P4ADGB Bearing Typical Application Areas
The 7028 ACD/P4ADGB is engineered for high-performance applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Gearboxes and High-Frequency Motors.
- Industrial Pumps and Compressors requiring reliable axial positioning.
- Aerospace & Defense Systems: Gyroscopes, radar equipment, and other precision instruments.
