7028 ACD/HCP4A
Hybrid Ceramic Super Precision Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
7028 ACD/HCP4A
Basic Information
System of measurement
Metric
Weight
2.83 kg
Tolerance class
P4 (ABEC-7)
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
140 mm
Bore diameter tolerance
-0.01mm to 0
Outside diameter
210 mm
Outside diameter tolerance
-0.011mm to 0
Width
33 mm
Width tolerance
-0.24mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
22.225 mm
Ball quantity
22
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
32850 lbf
Radial static load rating
35100 lbf
Limiting speed
11 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Preload
Available
Materials
Ring material
Chrome Steel
Ball material
Ceramic
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
Price:
$ 1894.18
/ each
In Stock
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7028 ACD/HCP4A Bearing Product Overview & Core Advantages
The 7028 ACD/HCP4A is a high-precision angular contact ball bearing engineered for demanding applications requiring exceptional rotational accuracy and rigidity. This single-row bearing is designed to accommodate high combined loads, primarily thrust loads in one direction, and is supplied with a specified preload for immediate high-stiffness performance. Its construction with a phenolic resin cage and ceramic balls enables superior high-speed capabilities, making it an ideal solution for high-performance spindles and precision machinery where reliability and accuracy are paramount.
7028 ACD/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7028 | Standard bore diameter (140 mm), outside diameter (210 mm), and width (33 mm) dimensions. |
| ACD | Angular Contact Design with a 25° contact angle, optimized for high thrust load capacity. |
| HCP4A | Indicates P4 (ABEC-7) tolerance class for ultra-precision and the application of a specific preload grade (A). |
7028 ACD/HCP4A Bearing Structural Features & Performance Benefits
- High Rigidity & Preload: The bearing is supplied with a preload, eliminating internal clearance and providing immediate high rigidity for precise shaft positioning and reduced vibration under load.
- Superior High-Speed Performance: The combination of a lightweight phenolic resin cage and low-density, high-hardness ceramic balls significantly reduces centrifugal forces, enabling a high limiting speed of 11,000 rpm.
- Excellent Load Capacity: The 25° contact angle and robust chrome steel rings are engineered to handle high radial dynamic load ratings (32,850 lbf) and static load ratings (35,100 lbf).
- Extended Service Life: Ceramic balls are non-corrosive and provide lower friction and wear, contributing to longer bearing life, especially in high-speed and potentially unlubricated start-up conditions.
- Precision Operation: Manufactured to P4 (ABEC-7) tolerance class, this bearing ensures minimal runout and exceptional rotational accuracy for critical applications.
7028 ACD/HCP4A Bearing Typical Application Areas
This precision bearing is ideally suited for:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and high-accuracy rotary axes.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and auxiliary power units.
- High-Frequency Motors and Spindles: Where minimal vibration and high rotational accuracy are required.
