7211 CD/P4ADBA
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7211 CD/P4ADBA
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
15 °
Ball & Washer Dimensions
Ball diameter
14.288 mm
Ball quantity
15
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
20340 lbf
Radial static load rating
19125 lbf
Limiting speed
34 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
Extra light / Class A
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 CD/P4ADBA Bearing Product Overview & Core Advantages
The 7211 CD/P4ADBA is a precision duplex angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. This back-to-back (DB) matched set is preloaded to Extra Light (Class A) specifications, ensuring minimal axial and radial runout for superior performance in high-precision machinery. Its primary advantage lies in its ability to handle combined loads (simultaneous radial and axial loads) with high stability, making it ideal for spindles and other critical rotating components. Manufactured to P4A tolerance class, it guarantees tight dimensional control and consistent, reliable operation.
7211 CD/P4ADBA Bearing Model Code Explained, Specifications & Naming Convention
The model number 7211 CD/P4ADBA provides detailed technical specifications:
- 7211: Basic bearing designation (55mm bore, 100mm OD, 21mm single width).
- C: Denotes a 15° contact angle, optimized for high-speed operation with moderate axial load capacity.
- D: Indicates the bearing is part of a Duplex (paired) set.
- DB: Specifies the Back-to-Back mounting arrangement, which provides high moment rigidity.
- /P4A: Signifies the P4A tolerance class, indicating very high dimensional and running accuracy.
- A: Designates the Extra Light preload level applied to the matched set.
7211 CD/P4ADBA Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The back-to-back duplex design creates a wide effective spread between load centers, significantly increasing the bearing's resistance to moment loads and ensuring exceptional operational stiffness.
- Precision & Speed: Built to P4A tolerance class and featuring a lightweight phenolic resin cage, this bearing achieves smooth operation and a high limiting speed of 34,000 rpm, making it suitable for high-speed applications.
- Superior Load Capacity: The angular contact design with a 15° contact angle is engineered to efficiently support combined radial and axial loads, with a dynamic load rating of 20,340 lbf.
- Optimized for Precision: The Extra Light preload eliminates internal clearance, reducing vibration and noise while enhancing positional accuracy of the shaft.
7211 CD/P4ADBA Bearing Typical Application Areas
This high-precision duplex 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 Robotic Drives.
- High-Frequency Motors and Spindle Drives.
- Medical Equipment: CT scanners and advanced diagnostic machinery.
- Aerospace & Defense Systems: Gyroscopes and navigation instruments.
