7028 ACD/P4A
7000 Series Super Precision Angular Contact Ball Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
7028 ACD/P4A
Basic Information
System of measurement
Metric
Weight
3.42 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
8.5 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Preload
Available
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
Price:
$ 1893.61
/ each
In Stock
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7028 ACD/P4A Bearing Product Overview & Core Advantages
The 7028 ACD/P4A is a high-precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. As a single-row bearing with a 25° contact angle, it is optimized to support combined loads, handling significant radial loads and axial loads in one direction simultaneously. Manufactured to P4 (ABEC-7) tolerance class, it guarantees ultra-precise running accuracy. Its preload availability ensures maximum system stiffness and minimizes axial and radial runout, making it an ideal choice for high-speed and high-rigidity spindles.
7028 ACD/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Suffix | Technical Meaning |
|---|---|
| ACD | Indicates a 25° contact angle and that the bearing is designed for Universal Match mounting (can be paired in various arrangements). |
| P4A | Denotes a P4 tolerance class (equivalent to ABEC-7) with specific dimensional and running accuracy requirements narrower than P5. |
7028 ACD/P4A Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: The 25° contact angle and availability of preload provide superior axial and radial stiffness, critical for minimizing deflection under load in precision machinery.
- Optimized for Combined Loads: The angular contact design is inherently capable of supporting combined radial and axial loads efficiently.
- High-Speed Capability: The lightweight phenolic resin cage reduces centrifugal forces, contributing to stable operation at high rotational speeds, with a limiting speed of 8,500 rpm.
- Premium Material Construction: Manufactured from chrome steel for both rings and balls, ensuring high durability, wear resistance, and a long operational lifespan.
- Pre-Lubricated: The bearing comes lubricated from the factory, ready for immediate installation and initial operation.
7028 ACD/P4A Bearing Typical Application Areas
This bearing is engineered for high-performance applications where precision and speed are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Grinding Spindles
- High-Frequency Motors
- Industrial Pumps and Compressors
- Aerospace and Defense Positioning Systems
