S7028 ACD/P4A
Sealed Super Precision Angular Contact Ball Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
S7028 ACD/P4A
Basic Information
System of measurement
Metric
Weight
3.44 kg
Tolerance class
P4 (ABEC-7)
Seal type
Sealed
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
5.6 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:
$ 2272.12
/ each
In Stock
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S7028 ACD/P4A Bearing Product Overview & Core Advantages
The S7028 ACD/P4A is a precision angular contact ball bearing engineered for high-performance applications requiring exceptional rigidity and rotational accuracy. As a single-row bearing with a 25° contact angle and P4 (ABEC-7) tolerance class, it is designed to handle significant combined loads—simultaneous radial and axial forces. Its preload availability ensures minimal deflection and precise shaft positioning, making it an ideal choice for high-speed spindles and other demanding machinery where high rigidity and operational reliability are paramount.
S7028 ACD/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| ACD | Angular Contact Design with a 25° contact angle, optimized for high axial load capacity. |
| P4A | Indicates a high-precision tolerance class equivalent to ABEC-7, ensuring extremely tight dimensional and running accuracy for smooth, high-speed operation. |
S7028 ACD/P4A Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The optimized 25° contact angle and robust construction enable the bearing to support high combined radial and axial loads effectively. The availability of preload further enhances system stiffness, reducing vibration and improving machining accuracy.
- High-Speed Performance: The lightweight, durable phenolic cage minimizes centrifugal forces and friction, contributing to a high limiting speed of 5,600 rpm. This makes it suitable for high-speed applications.
- Precision Engineering: Manufactured to P4 tolerance standards with tight dimensional controls on the 140 mm bore, 210 mm outside diameter, and 33 mm width, this bearing guarantees consistent, high-accuracy performance.
- Sealed & Lubricated Design: The sealed configuration protects against contamination and retains lubrication, ensuring long service life and reliable operation within a temperature range of -30°C to 110°C.
S7028 ACD/P4A Bearing Typical Application Areas
This precision angular contact ball bearing is ideally suited for high-demand sectors, including:
- Machine Tool Spindles: Providing the necessary rigidity and speed for high-precision milling, grinding, and turning centers.
- High-Speed Motors & Spindles: Used in applications requiring rapid acceleration and deceleration.
- Precision Industrial Pumps & Compressors: Where reliable performance under combined loads is critical.
- Robotics and Automation Equipment: For accurate and repeatable motion control.
