S7028 CD/P4ATBTA
Sealed Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
S7028 CD/P4ATBTA
Basic Information
System of measurement
Metric
Weight
10.3 kg
Tolerance class
P4A
Seal type
Sealed
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
11 X 1000 rpm
Lubrication
Grease
Matched arrangement
Triplex Back-to-Back (TBT)
Number of bearings in matched set
3
Universal matching bearing
No (Standard)
Preload
Extra light / Class A
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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S7028 CD/P4ATBTA Bearing Product Overview & Core Advantages
The S7028 CD/P4ATBTA is a metric precision angular contact ball bearing designed for ultra-high performance applications. This triplex matched set in a back-to-back (TBT) arrangement delivers exceptional system rigidity and stability. Engineered to a P4A tolerance class, it offers superior running accuracy, making it ideal for machine tool spindles and other high-precision, high-speed equipment. The sealed design and pre-lubrication ensure long-term, maintenance-free operation.
S7028 CD/P4ATBTA Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning | Benefit |
|---|---|---|
| CD | High precision, 15° contact angle | Optimized for high-speed operation and combined loads. |
| P4A | Tolerance class superior to ABEC 7/ISO P4 | Guarantees exceptional running accuracy and minimal vibration. |
| TB | Triplex Back-to-Back matched set | Provides maximum system rigidity and moment load capacity. |
| TA | Universal matching not required (standard) | Simplifies installation as the set is pre-matched for optimal performance. |
S7028 CD/P4ATBTA Bearing Structural Features & Performance Benefits
- Exceptional Rigidity & Load Capacity: The triplex back-to-back arrangement of three bearings creates an extremely stiff bearing system, capable of withstanding heavy combined radial and axial loads as well as significant moment loads. The 15° contact angle is optimized for high axial load support.
- High-Speed Capability: The phenolic resin cage is lightweight and robust, contributing to low friction and enabling a high limiting speed of 11,000 rpm. This makes it suitable for demanding spindle applications.
- Precision Performance: Manufactured to P4A tolerance class with tight dimensional tolerances on the bore, outside diameter, and width, this bearing ensures superior running accuracy, reduced vibration, and enhanced positional control.
- Sealed & Pre-Lubricated Design: The integrated seals protect against contamination, while the factory-applied grease lubrication provides reliable operation across a wide temperature range from -30°C to 110°C, offering a long, maintenance-free service life.
S7028 CD/P4ATBTA Bearing Typical Application Areas
This high-precision triplex bearing set is engineered for the most demanding applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling machines and high-frequency motor spindles.
- Industrial Pumps & Compressors: Where high rigidity and reliability are critical.
- Advanced Robotics: High-accuracy rotary joints and arms.
