7211 ACD/P4AQBCB
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7211 ACD/P4AQBCB
Basic Information
System of measurement
Metric
Weight
2.45 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
84 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
31500 lbf
Radial static load rating
36675 lbf
Limiting speed
34 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Quadruplex Back-to-Back (QBC)
Number of bearings in matched set
4
Universal matching bearing
No (Standard)
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
In Stock
Price available upon request.
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7211 ACD/P4AQBCB Bearing Product Overview & Core Advantages
The 7211 ACD/P4AQBCB is a precision angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. Its Quadruplex Back-to-Back (QBC) matched arrangement provides superior stability and the ability to withstand combined loads (radial and axial). Manufactured to a P4A tolerance class with a Light (Class B) preload, this bearing is engineered for high-speed operation and long-term reliability in precision machinery. Its compact design integrates four bearings into a single, highly rigid unit.
7211 ACD/P4AQBCB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7211 | Basic bearing series, indicating a 55 mm bore, 100 mm OD, and 21 mm nominal width per bearing. |
| ACD | Angular Contact design with a 25° contact angle. |
| P4A | Indicates a high-precision tolerance class (superior to ABEC 7), ensuring minimal runout and vibration. |
| QBC | Specifies a Quadruplex Back-to-Back matched set of 4 bearings, providing maximum rigidity against moment loads. |
| B | Denotes a specific Light preload (Class B) applied to the set, optimizing bearing performance and minimizing deflection under load. |
7211 ACD/P4AQBCB Bearing Structural Features & Performance Benefits
- Exceptional Rigidity: The Quadruplex Back-to-Back (QBC) arrangement creates an extremely stiff bearing system, ideal for applications where shaft deflection must be minimized. This configuration effectively resists complex combined loads and moment forces.
- High-Speed Capability: The phenolic cage is lightweight and robust, contributing to lower centrifugal forces and stable operation at the high limiting speed of 34,000 rpm. The 25° contact angle provides an excellent balance between radial and axial load capacity for high-speed applications.
- Precision Performance: Manufactured to P4A tolerance standards with a controlled preload, this bearing ensures precise rotational accuracy, reduced non-repetitive runout, and smooth operation, which is critical for machine tool spindles and other precision equipment.
- High Load Capacity: With a dynamic load rating of 31,500 lbf and a static load rating of 36,675 lbf, this bearing set is built to handle significant combined loads over a long service life.
7211 ACD/P4AQBCB Bearing Typical Application Areas
This precision bearing is ideally suited for high-performance machinery where accuracy, speed, and rigidity are paramount. Key applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Grinding Spindles: Applications requiring ultra-fine surface finishes.
- High-Frequency Motors and Spindles: Where minimal runout and high rotational accuracy are critical.
- Industrial Pumps and Compressors: For robust and reliable operation under demanding conditions.
