S7028 ACD/P4ADGA
Sealed Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
S7028 ACD/P4ADGA
Basic Information
System of measurement
Metric
Weight
6.89 kg
Tolerance class
P4A
Seal type
Sealed
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
Grease
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
Chrome Steel
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
In Stock
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S7028 ACD/P4ADGA Bearing Product Overview & Core Advantages
The S7028 ACD/P4ADGA is a precision double row angular contact ball bearing designed for applications demanding exceptional rigidity and accuracy. Engineered with an extra light preload (Class A) and manufactured to P4A tolerance class, this bearing excels in high-speed, high-precision environments. Its double row design enables it to support combined loads—significant radial loads and bidirectional axial loads—simultaneously, making it an ideal, compact solution for spindles and other critical rotating assemblies where high reliability and high rigidity are paramount.
S7028 ACD/P4ADGA Bearing Model Code Explained, Specifications & Naming Convention
The S7028 ACD/P4ADGA model number provides detailed technical specifications:
- S70: Denotes a high-precision angular contact ball bearing series.
- 28: Indicates the bore diameter code (140 mm).
- AC: Signifies the 25° contact angle, optimized for supporting combined loads.
- D: Represents the double row design.
- P4A: The tolerance class, indicating extremely tight dimensional and running accuracy.
- DGA: Specifies the universal matchable (SU) designation, allowing two bearings to be mounted in a universal arrangement for optimal performance.
S7028 ACD/P4ADGA Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The double row angular contact design provides superior radial and axial stiffness, effectively handling combined loads and ensuring stable operation under demanding conditions.
- Precision & Speed: Manufactured to P4A tolerance class and featuring a lightweight phenolic cage, this bearing achieves a high limiting speed of 11,000 rpm with minimal vibration and heat generation.
- Optimized for Matching: The Universal Matchable (SU) feature allows two bearings to be paired in a universal arrangement, simplifying installation and ensuring preload consistency for maximum system performance.
- Sealed & Lubricated for Life: As a sealed bearing pre-lubricated with grease, it offers protection from contamination and is suitable for the specified temperature range of -30°C to 110°C, ensuring long service life with minimal maintenance.
S7028 ACD/P4ADGA Bearing Typical Application Areas
This precision bearing is ideally suited for high-performance applications including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Gearboxes and Industrial Pumps.
- High-Frequency Motors and Compressors.
- Medical Equipment and Aerospace Instrumentation requiring high accuracy and reliability.
