7211 ACD/P4ADT
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7211 ACD/P4ADT
Basic Information
System of measurement
Metric
Weight
1.23 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
55 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
100 mm
Outside diameter tolerance
-0.004mm to 0
Width
42 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
14.288 mm
Ball quantity
15
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
19170 lbf
Radial static load rating
18338 lbf
Limiting speed
34 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Duplex Tandem (DT)
Number of bearings in matched set
2
Universal matching bearing
No (Standard)
Preload
Available
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.
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7211 ACD/P4ADT Bearing Product Overview & Core Advantages
The 7211 ACD/P4ADT is a precision angular contact ball bearing configured in a Duplex Tandem (DT) arrangement. This matched set of two bearings is engineered to deliver exceptional performance in applications requiring high rigidity and the capacity to handle significant combined loads. With a P4A tolerance class and a 25° contact angle, it offers superior running accuracy and is optimized for high-speed operation, making it an ideal choice for demanding, precision machinery.
7211 ACD/P4ADT Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7211 | Basic bearing series, defining the standard dimensions: 55mm bore, 100mm OD, 42mm width. |
| AC | Angular Contact design, enabling it to support combined radial and axial loads. |
| D | Duplex arrangement. In this context, it signifies the bearing is supplied as one half of a pre-configured set. |
| P4A | High precision tolerance class, offering extremely tight dimensional and running accuracy for superior performance. |
| DT | Duplex Tandem arrangement. The two bearings are matched to face the same direction, increasing axial load capacity in one direction. |
7211 ACD/P4ADT Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The Duplex Tandem (DT) arrangement creates a highly rigid bearing system capable of withstanding heavy combined loads and high unidirectional axial loads, which is critical for maintaining precision under demanding operating conditions.
- Precision & High-Speed Performance: Manufactured to a P4A tolerance class, this bearing ensures minimal runout and vibration. The phenolic resin cage and 25° contact angle contribute to stable operation at the high limiting speed of 34,000 rpm.
- Optimized Material Selection: Constructed from chrome steel for both rings and balls, the bearing provides high fatigue life and durability. The phenolic cage is lightweight and robust, ideal for high-speed applications.
- Preload & Matched Set: Supplied as a pre-loaded, matched set of two bearings, ensuring immediate optimal performance and simplified installation without the need for on-site adjustment.
7211 ACD/P4ADT Bearing Typical Application Areas
This bearing is specifically designed for high-performance applications, including:
- Machine Tool Spindles: For high-speed milling, grinding, and turning centers requiring extreme precision and rigidity.
- High-Frequency Motors & Spindles: Where high rotational speeds and accuracy are paramount.
- Precision Gearboxes: In applications demanding low noise, high speed, and accurate shaft positioning.
- Aerospace & Defense Systems: Including gyroscopes, radar equipment, and other critical rotating assemblies.
