7028 ACD/P4AQBCA
7000 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7028 ACD/P4AQBCA
Basic Information
System of measurement
Metric
Weight
13.7 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
132 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
84825 lbf
Radial static load rating
141750 lbf
Limiting speed
6.3 X 1000 rpm
Lubrication
Lubricated
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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7028 ACD/P4AQBCA Bearing Product Overview & Core Advantages
The 7028 ACD/P4AQBCA is a precision quadruplex angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. Engineered as a matched set of four bearings in a Back-to-Back (QBC) arrangement, it delivers superior performance under combined loads, including significant radial and axial loads. Manufactured to the stringent P4A tolerance class, this bearing offers high running accuracy, making it ideal for high-speed, high-precision machinery where maximum system rigidity and operational reliability are paramount.
7028 ACD/P4AQBCA Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| ACD | Angular Contact Design with a 25° contact angle. |
| P4A | Indicates a high precision tolerance class exceeding ABEC 7 (P4), with specific running accuracy requirements. |
| QBC | Denotes a Quadruplex Back-to-Back matched set arrangement, providing high moment stiffness. |
7028 ACD/P4AQBCA Bearing Structural Features & Performance Benefits
- Exceptional Rigidity: The quadruplex back-to-back arrangement creates a highly rigid bearing system capable of withstanding complex moment loads, making it suitable for applications where shaft deflection must be minimized.
- High Load Capacity: The 25° contact angle and robust construction enable the bearing to handle significant combined radial and axial loads simultaneously.
- Optimized High-Speed Performance: The lightweight phenolic cage reduces centrifugal forces, contributing to a high limiting speed of 6,300 rpm. The bearing is pre-lubricated for immediate operation.
- Precision Engineering: Manufactured to P4A tolerance standards with tight dimensional control on the bore diameter, outside diameter, and width, ensuring smooth, quiet, and accurate operation.
- Durable Construction: Components made from chrome steel for both rings and balls provide high fatigue resistance and long service life.
7028 ACD/P4AQBCA Bearing Typical Application Areas
This bearing is specifically engineered for high-performance machinery, including:
- Machine Tool Spindles (e.g., grinding, milling, and turning centers)
- High-Speed Precision Spindles
- Industrial Pumps and Compressors
- Robotic and Automation Systems
- Aerospace and Defense Actuation Systems
