7028 CD/P4ADBC
7000 Series Super Precision Angular Contact Ball Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
7028 CD/P4ADBC
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
Duplex Back-to-Back (DB)
Number of bearings in matched set
2
Universal matching bearing
No (Standard)
Preload
Moderate / Class C
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
Price available upon request.
Our sales team will respond within 24 hours with a competitive quote tailored to your requirements.
REQUEST A QUOTE
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
7028 CD/P4ADBC Bearing Product Overview & Core Advantages
The 7028 CD/P4ADBC is a precision duplex angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. This matched back-to-back (DB) arrangement is preloaded to provide high rigidity and superior stability under combined loads, including radial and bidirectional axial forces. Manufactured to P4A tolerance class, it ensures minimal runout and is ideal for high-precision, high-speed machinery. Its phenolic cage and optimized 15° contact angle contribute to smooth operation at elevated speeds.
7028 CD/P4ADBC Bearing Model Code Explained, Specifications & Naming Convention
The model number 7028 CD/P4ADBC is decoded as follows:
- 7028: Basic bearing series and size designation (140mm bore, 210mm OD).
- C: Denotes a 15° contact angle.
- D: Indicates a specific internal design and preload level (Moderate / Class C).
- /P4A: Specifies the tolerance class for ultra-precision applications (equivalent to ABEC 7).
- DB: Identifies the Duplex Back-to-Back matched arrangement.
- C: Specifies the Moderate preload level for optimal rigidity.
7028 CD/P4ADBC Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The duplex back-to-back (DB) configuration and moderate preload create a highly rigid bearing system that effectively resists moment loads and shaft deflection, ensuring precise shaft positioning.
- Superior Load Capacity: Engineered to handle significant combined radial and axial loads simultaneously. The 15° contact angle is optimized for supporting substantial axial loads in both directions.
- High-Speed Performance: The lightweight phenolic resin cage reduces centrifugal forces, lowers friction, and enables a high limiting speed of 6,300 rpm. This makes it suitable for high-speed spindles and other rapid rotation applications.
- Precision Operation: Manufactured to P4A tolerance class with tight dimensional control on bore, outside diameter, and width, resulting in extremely low vibration and noise levels for smooth, accurate rotation.
7028 CD/P4ADBC Bearing Typical Application Areas
This bearing is ideally suited for high-performance machinery where precision, speed, and rigidity are paramount. Key applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Gearboxes and High-Frequency Motors.
- Industrial Pumps and Compressors.
- Medical Equipment and Aerospace Actuators.
