7028 ACDGC/P4A
7000 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7028 ACDGC/P4A
Basic Information
System of measurement
Metric
Weight
3.42 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
33 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
32850 lbf
Radial static load rating
35100 lbf
Limiting speed
6.3 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Number of bearings in matched set
3
Universal matching bearing
Universal Matchable (SU)
Preload
Moderate / Class C
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
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In Stock
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7028 ACDGC/P4A Bearing Product Overview & Core Advantages
The 7028 ACDGC/P4A is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. Manufactured to P4A tolerance class, this bearing delivers superior running accuracy and dimensional stability. Its 25° contact angle and moderate preload (Class C) are optimized to handle significant combined loads—simultaneous radial and axial loads—making it an ideal choice for high-speed spindles and precision machinery where high rigidity and operational reliability are paramount.
7028 ACDGC/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| AC | Angular Contact design with a 25° contact angle. |
| DGC | Universal Matchable (SU) bearing, designed to be paired in sets (3 bearings in a matched set). |
| P4A | High precision tolerance class, exceeding ABEC 7 standards, ensuring minimal runout and vibration. |
7028 ACDGC/P4A Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The angular contact design and phenolic cage provide a robust structure capable of supporting high combined loads. With a dynamic load rating of 32,850 lbf and static load rating of 35,100 lbf, it ensures reliable performance under strenuous operating conditions.
- High-Speed Performance: The lightweight phenolic cage and optimized internal geometry contribute to a high limiting speed of 6,300 rpm, making it suitable for high-speed applications.
- Precision Engineering: Manufactured to P4A tolerances with tight dimensional controls on the bore diameter (140mm), outside diameter (210mm), and width (33mm), guaranteeing consistent, high-accuracy performance.
- Universal Matching: Designed as a Universal Matchable (SU) bearing, it can be pre-loaded in sets (typically 3 bearings) to achieve the desired stiffness and accuracy without additional adjustments.
7028 ACDGC/P4A Bearing Typical Application Areas
- Machine Tool Spindles
- High-Frequency Motors
- Precision Grinding Equipment
- Aerospace Actuation Systems
- Medical and Laboratory Instrumentation
