7028 ACD/HCP4ADGA
Hybrid Ceramic Super Precision Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
7028 ACD/HCP4ADGA
Basic Information
System of measurement
Metric
Weight
5.65 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
11 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Universal Matchable (SU)
Number of bearings in matched set
2
Universal matching bearing
Universal Matchable (SU)
Preload
Extra light / Class A
Materials
Ring material
Chrome Steel
Ball material
Ceramic
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
Price:
$ 1540.12
/ each
In Stock
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7028 ACD/HCP4ADGA Bearing Product Overview & Core Advantages
The 7028 ACD/HCP4ADGA is a high-precision angular contact ball bearing engineered for demanding applications requiring exceptional accuracy and performance. This universal matchable bearing is supplied as a pre-lubricated, pre-set pair, designed to accommodate combined loads (radial and axial) simultaneously. Its extra light preload (Class A) and P4A tolerance class ensure smooth, quiet operation with minimal runout, making it ideal for high-speed spindles and other precision machinery where high rigidity and rotational accuracy are critical.
7028 ACD/HCP4ADGA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7028 | Standard bore diameter (140 mm), outside diameter (210 mm), and width (66 mm) dimensions. |
| AC | Angular Contact design with a 25° contact angle. |
| D | The bearing is supplied as a universal matchable pair (DU). |
| HCP4A | Indicates P4A tolerance class (geometric and running accuracy superior to ABEC 7) and a phenolic resin cage. |
| DGA | Specifies an extra light preload (Class A) on the matched set. |
7028 ACD/HCP4ADGA Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The dual bearing arrangement and 25° contact angle provide superior stiffness, enabling the bearing to handle significant combined radial and axial loads.
- Ultra-High-Speed Capability: The combination of a lightweight phenolic cage and ceramic balls (Silicon Nitride) reduces centrifugal forces and friction, allowing for a very high limiting speed of 11,000 rpm. This construction also reduces heat generation.
- Precision Performance: Manufactured to P4A tolerance class with tight dimensional tolerances on all surfaces, this bearing guarantees exceptional running accuracy and minimal vibration for precision applications.
- Optimized for Matched Sets: As a Universal Matchable (SU) bearing, two bearings can be paired in any combination (back-to-back, face-to-face, or tandem) to precisely meet the specific stiffness and load requirements of the application without additional selective assembly.
7028 ACD/HCP4ADGA Bearing Typical Application Areas
This bearing is specifically designed for high-performance machinery, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling, semiconductor manufacturing equipment.
- High-Frequency Motors: Motors and generators operating at extreme rotational speeds.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and other critical rotating assemblies.
