7028 CD/P4ATGA
7000 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7028 CD/P4ATGA
Basic Information
System of measurement
Metric
Weight
10.3 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
99 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
22.225 mm
Ball quantity
22
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
74700 lbf
Radial static load rating
112500 lbf
Limiting speed
6.3 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Universal Matchable (SU)
Number of bearings in matched set
3
Universal matching bearing
Universal Matchable (SU)
Preload
Extra light / Class A
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
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In Stock
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7028 CD/P4ATGA Bearing Product Overview & Core Advantages
The 7028 CD/P4ATGA is a high-precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. Manufactured to P4A tolerance class, this bearing delivers superior running precision. Its universal matchable (SU) design allows for flexible mounting in various preload configurations, making it ideal for high-speed spindles and other high-performance machinery. The bearing comes pre-lubricated and features an open design for controlled lubrication systems, ensuring optimal performance within its specified temperature range.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 7028 | Basic bearing series, indicating a 140mm bore, 210mm OD, and 99mm width. |
| CD | Contact angle of 15° and universal matchable (SU) design. |
| P4A | High precision tolerance class, exceeding ABEC 7/ISO P4 standards. |
| TGA | Indicates a phenolic (Polyamide) cage and specific internal design optimized for high-speed operation. |
7028 CD/P4ATGA Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The 15° contact angle and robust construction enable the bearing to support significant combined loads (radial and axial). The extra light preload (Class A) minimizes deflection under load, enhancing system stiffness.
- High-Speed Performance: The lightweight phenolic cage reduces centrifugal forces, contributing to a high limiting speed of 6,300 rpm. This makes it suitable for demanding high-speed applications.
- Precision Engineering: Manufactured to P4A tolerance class with tight dimensional control on the bore, outside diameter, and width, ensuring predictable and precise performance in the most demanding assemblies.
- Universal Matching: As a Universal Matchable (SU) bearing, it can be paired with other identical bearings in various arrangements (back-to-back, face-to-face, or tandem) to achieve specific preload and stiffness characteristics without selective mounting.
7028 CD/P4ATGA Bearing Typical Application Areas
This precision angular contact bearing is engineered for high-performance applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Gearboxes and High-Speed Drives.
- Industrial Pumps and Compressors.
- Aerospace & Defense Systems: Gyroscopes, radar equipment, and other precision mechanisms.
