7028 CD/P4ADGB
7000 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7028 CD/P4ADGB
Basic Information
System of measurement
Metric
Weight
6.84 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
15 °
Ball & Washer Dimensions
Ball diameter
22.225 mm
Ball quantity
22
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
55575 lbf
Radial static load rating
75375 lbf
Limiting speed
6.3 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Universal Matchable (SU)
Number of bearings in matched set
2
Universal matching bearing
Universal Matchable (SU)
Preload
Light / Class B
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:
$ 1291.04
/ each
In Stock
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7028 CD/P4ADGB Bearing Product Overview & Core Advantages
The 7028 CD/P4ADGB is a precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and high rigidity. Manufactured to P4A tolerance class, it offers superior dimensional stability and running accuracy. Its universal matchable (SU) design allows two bearings to be paired in a back-to-back (DB) or face-to-face (DF) arrangement without selective mounting, simplifying installation and ensuring optimal preload for handling combined loads (radial and axial). The phenolic cage and light preload (Class B) contribute to its excellent high-speed performance, making it an ideal choice for high-precision, high-reliability machinery.
7028 CD/P4ADGB Bearing Model Code Explained, Specifications & Naming Convention
The model number 7028 CD/P4ADGB provides detailed technical specifications through its suffixes:
- 7028: Basic bearing designation (140mm bore, 210mm OD).
- C: Denotes a 15° contact angle, optimized for high axial load capacity.
- D: Indicates the bearing is part of a universally matchable pair (SU).
- P4A: Specifies a very high precision tolerance class, exceeding ABEC 7/ISO P4 standards, ensuring minimal runout and vibration.
- DGB: "Duplex, Back-to-Back" arrangement. This signifies the bearing is supplied as a pre-set, universally matchable pair in a back-to-back configuration, providing high moment rigidity.
7028 CD/P4ADGB Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The duplex back-to-back (DGB) arrangement creates a wide effective spread, significantly increasing the bearing set's resistance to moment loads and providing high system rigidity. The 15° contact angle is engineered to efficiently support substantial combined radial and axial loads.
- Precision & High-Speed Performance: Built to P4A tolerance class with a phenolic resin cage, this bearing achieves smooth operation with minimal vibration and friction, enabling very high limiting speeds (6,300 rpm). The light preload ensures consistent performance under high-speed rotation.
- Optimized for Matched Sets: The Universal Matchable (SU) feature guarantees that any two bearings can be paired without selective grinding, ensuring predictable and repeatable preload characteristics, which simplifies inventory and assembly processes.
- Durable Material Construction: Manufactured from chrome steel for both rings and balls, the bearing offers high fatigue life and wear resistance, suitable for a wide operating temperature range from -30°C to 110°C.
7028 CD/P4ADGB Bearing Typical Application Areas
This high-precision bearing is ideally suited for demanding applications where accuracy, speed, and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Gearboxes and High-Frequency Motors.
- Industrial Pumps and Compressors.
- Aerospace & Defense Systems: Gyroscopes, radar equipment, and navigation systems.
- Medical Equipment: High-speed dental handpieces and imaging devices.
