7028 ACD/P4ATBTB
7000 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7028 ACD/P4ATBTB
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
25 °
Ball & Washer Dimensions
Ball diameter
22.225 mm
Ball quantity
22
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
70200 lbf
Radial static load rating
106875 lbf
Limiting speed
6.3 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Triplex Back-to-Back (TBT)
Number of bearings in matched set
3
Universal matching bearing
No (Standard)
Preload
Light / Class B
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 ACD/P4ATBTB Bearing Product Overview & Core Advantages
The 7028 ACD/P4ATBTB is a super-precision angular contact ball bearing designed for the most demanding applications. This triplex back-to-back (TBT) matched set delivers exceptional system rigidity and stability, capable of handling complex combined loads including high radial and moment loads. Manufactured to P4A tolerance class, it guarantees superior running accuracy and positional precision. The phenolic cage and optimized contact angle of 25° contribute to outstanding high-speed performance, making it an ideal solution for high-precision, high-rigidity spindle systems.
7028 ACD/P4ATBTB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7028 | Basic bearing designation indicating a 140mm bore, 210mm OD, and 99mm width. |
| ACD | Angular Contact Design with a 25° contact angle. |
| P4A | High-precision tolerance class exceeding ABEC 7/ISO P4 standards. |
| TBT | Triplex Back-to-Back arrangement of three matched bearings. |
7028 ACD/P4ATBTB Bearing Structural Features & Performance Benefits
- Exceptional Rigidity & Stability: The triplex back-to-back (TBT) matched set configuration provides maximum system stiffness, effectively resisting moment loads and minimizing shaft deflection under heavy combined loads.
- Superior Load Capacity: With a radial dynamic load rating of 70,200 lbf and a radial static load rating of 106,875 lbf, this bearing set is engineered for high-load applications.
- Optimized High-Speed Performance: The lightweight phenolic cage reduces centrifugal forces, while the 25° contact angle provides an ideal balance between radial and axial load capacity, enabling a high limiting speed of 6,300 rpm.
- Precision Engineering: The P4A tolerance class ensures minimal runout and vibration, which is critical for maintaining accuracy in precision machinery. The open design allows for customized lubrication schemes to suit specific operational needs.
7028 ACD/P4ATBTB Bearing Typical Application Areas
This super-precision angular contact ball bearing set is ideally suited for:
- High-Precision Machine Tool Spindles (e.g., grinding, milling, and turning centers)
- High-Speed Machining Centers
- Precision Grinding Spindles
- Other applications requiring extreme rigidity, high rotational accuracy, and the ability to handle complex combined loads.
