7028 ACD/P4ADGC
7000 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7028 ACD/P4ADGC
Basic Information
System of measurement
Metric
Weight
6.84 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
66 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
52650 lbf
Radial static load rating
70875 lbf
Limiting speed
6.3 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Universal Matchable (SU)
Number of bearings in matched set
2
Universal matching bearing
Universal Matchable (SU)
Preload
Moderate / Class C
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/P4ADGC Bearing Product Overview & Core Advantages
The 7028 ACD/P4ADGC is a precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. Engineered to a P4A tolerance class, this bearing excels in high-speed scenarios, with a limiting speed of 6,300 rpm. Its defining feature is the Universal Matchable (SU) designation, allowing two bearings to be preloaded against each other in a universal arrangement, simplifying installation and ensuring optimal performance. The combination of a 25° contact angle and moderate preload (Class C) provides superior capability to handle combined loads, making it an ideal solution for high-rigidity, high-precision spindles and machinery.
7028 ACD/P4ADGC Bearing Model Code Explained, Specifications & Naming Convention
The model number 7028 ACD/P4ADGC provides detailed technical specifications through its suffixes:
- 7028: Basic designation indicating a 140mm bore, 210mm OD, and 66mm width.
- AC: Angular Contact design, optimized for combined radial and axial loads.
- D: Signifies a high rigid internal design and construction.
- P4A: Denotes an ultra-precision tolerance class superior to ABEC 7, ensuring minimal runout and vibration.
- DGC: Indicates the bearing is supplied lubricated and comes as part of a Universal Matchable (SU) pair.
7028 ACD/P4ADGC Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The double-row design and robust construction using chrome steel rings and balls provide exceptional stiffness, enabling the bearing to support high radial dynamic load ratings of 52,650 lbf and radial static load ratings of 70,875 lbf. The 25° contact angle is optimally designed to handle significant thrust loads in addition to radial loads.
- High-Speed Performance: The lightweight phenolic resin cage minimizes centrifugal forces, reduces friction, and contributes to the high limiting speed of 6,300 rpm. This makes the bearing suitable for high-speed spindle applications.
- Precision & Stability: Manufactured to a P4A tolerance class, this bearing guarantees extreme dimensional accuracy and running precision, which is critical for applications requiring minimal vibration and high positional accuracy.
- Universal Matchability (SU): This feature allows two identical bearings to be mounted together in a back-to-back, face-to-face, or tandem arrangement without the need for selective matching, ensuring simplified assembly and consistent, preloaded performance.
7028 ACD/P4ADGC Bearing Typical Application Areas
This precision bearing is ideally suited for high-performance machinery where accuracy, speed, and rigidity are paramount. Key applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Grinding Spindles
- High-Frequency Motors
- Industrial Pumps and Compressors
- Advanced Robotics and Automation Equipment
