7028 ACD/P4ADBC
7000 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7028 ACD/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
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
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
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In Stock
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7028 ACD/P4ADBC Bearing Product Overview & Core Advantages
The 7028 ACD/P4ADBC is a precision duplex angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. This back-to-back (DB) matched pair is preloaded to Moderate / Class C standards, ensuring optimal stiffness and minimal axial/radial runout under complex loading conditions. Its primary advantage lies in its ability to handle combined radial and axial loads simultaneously with high precision, making it an ideal choice for high-performance spindles and machinery where high rigidity and operational stability are critical.
7028 ACD/P4ADBC Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| ACD | Angular Contact Design with a 25° contact angle for optimal axial load capacity. |
| P4A | Indicates a high precision tolerance class, exceeding standard ABEC 7 (P4) requirements for enhanced running accuracy. |
| DB | Signifies the bearings are supplied as a Duplex Back-to-Back matched set, preloaded for maximum rigidity. |
| C | Denotes the Moderate preload level (Class C), balancing rigidity and heat generation. |
7028 ACD/P4ADBC Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The back-to-back duplex arrangement creates a wide, rigid support system that effectively resists moment loads and maintains shaft positioning under heavy combined loads.
- Superior Load Capacity: With a 25° contact angle and robust construction, this bearing excels at carrying significant radial and axial loads simultaneously.
- Precision Performance: Manufactured to P4A tolerance class with tight dimensional controls on bore diameter (140 mm) and outside diameter (210 mm), ensuring smooth, low-vibration operation essential for high-speed applications.
- Optimized High-Speed Capability: The lightweight phenolic cage minimizes centrifugal forces, contributing to a high limiting speed of 11,000 rpm. The bearings are pre-lubricated for immediate operation.
- Durable Construction: Components made from chrome steel for both rings and balls provide high fatigue life and wear resistance, suitable for a temperature range of -30°C to 110°C.
7028 ACD/P4ADBC Bearing Typical Application Areas
This precision bearing is engineered for high-performance machinery where accuracy and stiffness are non-negotiable. Key applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Gearboxes and Pumps.
- High-Frequency Motors and Spindle Drives.
- Industrial Robotics and Automation Equipment.
