S7028 ACD/P4ATBTA
Sealed Super Precision Angular Contact Ball Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
S7028 ACD/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
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
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 ACD/P4ATBTA Bearing Product Overview & Core Advantages
The S7028 ACD/P4ATBTA is a super-precision angular contact ball bearing designed for the most demanding industrial applications. This triplex back-to-back (TBT) matched set delivers exceptional system rigidity and rotational accuracy, making it ideal for high-speed spindles. Its P4A tolerance class ensures superior running accuracy, while the 25° contact angle provides excellent capacity for combined radial and axial loads. The phenolic cage and pre-lubrication contribute to its outstanding high-speed performance and reliability.
S7028 ACD/P4ATBTA Bearing Model Code Explained, Specifications & Naming Convention
The model number S7028 ACD/P4ATBTA is decoded as follows:
- S70: Super-precision angular contact ball bearing series
- 28: Bore diameter code (140 mm)
- A: 25° contact angle
- CD: Triplex Back-to-Back (TBT) matched set
- P4A: High precision tolerance class (exceeding ABEC 7)
- TB: Phenolic (textile laminate) cage
- T: TBT arrangement designation
- A: Extra light preload
S7028 ACD/P4ATBTA Bearing Structural Features & Performance Benefits
- Exceptional Rigidity: The triplex back-to-back (TBT) arrangement of three bearings creates an extremely rigid bearing system, capable of resisting complex moment loads and maintaining precision under heavy cutting forces.
- Superior Load Capacity: The 25° contact angle and optimized internal geometry provide high radial and axial load ratings (70,200 lbf dynamic, 106,875 lbf static), enabling reliable operation under combined loading conditions.
- High-Speed Performance: The lightweight phenolic cage and precision-ground components allow for a high limiting speed of 11,000 rpm. The pre-applied grease lubrication ensures immediate and consistent performance at startup.
- Precision Engineering: Manufactured to P4A tolerance class with tight dimensional tolerances on bore, outside diameter, and width, this bearing guarantees minimal runout and vibration for ultra-precise applications.
S7028 ACD/P4ATBTA Bearing Typical Application Areas
This bearing is specifically engineered for high-performance machinery requiring maximum precision and speed, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers
- Precision Spindles: PCB drilling machines, jig borers, and coordinate measuring machines
- High-Frequency Motors: Spindles for CNC routers and high-speed machining
- Aerospace Equipment: Gyroscopes and navigation system components
