S7028 CD/P4AQBCA
Sealed Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
S7028 CD/P4AQBCA
Basic Information
System of measurement
Metric
Weight
13.8 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
132 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
90675 lbf
Radial static load rating
147375 lbf
Limiting speed
11 X 1000 rpm
Lubrication
Grease
Matched arrangement
Quadruplex Back-to-Back (QBC)
Number of bearings in matched set
4
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/P4AQBCA Bearing Product Overview & Core Advantages
The S7028 CD/P4AQBCA is a precision quadruplex back-to-back angular contact ball bearing designed for applications demanding exceptional rigidity and accuracy. This P4A tolerance class bearing features a sealed design and phenolic cage, enabling it to handle significant combined loads (radial and axial) simultaneously. Its compact quadruplex arrangement provides maximum stiffness and rotational precision, making it ideal for high-speed, high-reliability machinery where minimal deflection is critical.
S7028 CD/P4AQBCA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| S7028 | Basic bearing series and size designation (140mm bore, 210mm OD). |
| CD | Indicates a 15° contact angle, optimized for high-speed operation and axial load capacity. |
| P4A | Denotes a high-precision tolerance class with enhanced running accuracy for demanding applications. |
| QBC | Signifies a Quadruplex Back-to-Back matched set of four bearings, providing superior rigidity. |
| A | Specifies an Extra Light preload for minimal friction and optimal high-speed performance. |
S7028 CD/P4AQBCA Bearing Structural Features & Performance Benefits
- Exceptional Rigidity: The quadruplex back-to-back arrangement creates an extremely rigid bearing system that effectively resists moment loads and shaft deflection, ensuring precise rotational alignment.
- High Load Capacity: Engineered with a 15° contact angle and robust construction, this bearing is capable of supporting high combined radial and axial loads.
- Optimized High-Speed Performance: The lightweight phenolic resin cage reduces centrifugal forces, while the extra light preload minimizes friction, collectively enabling a high limiting speed of 11,000 rpm.
- Sealed & Pre-Lubricated Design: The integrated seals protect against contamination, and the factory-applied grease lubrication ensures immediate operation and long-term reliability within a wide temperature range of -30°C to 110°C.
- Precision Engineering: Manufactured to P4A tolerance class with tight dimensional controls on bore diameter, outside diameter, and width, guaranteeing consistent, high-accuracy performance.
S7028 CD/P4AQBCA Bearing Typical Application Areas
This bearing is specifically designed for high-performance applications, including:
- Machine Tool Spindles (e.g., grinding, milling, and turning centers)
- High-Speed Precision Spindles for PCB drilling and routing
- Industrial Pumps and Compressors
- Robotic Arm Rotary Joints and precision gearboxes
- Other machinery requiring a high-rigidity, high-speed angular contact bearing solution.
