S7211 CD/P4AQBCC
Sealed Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
S7211 CD/P4AQBCC
Basic Information
System of measurement
Metric
Weight
2.49 kg
Tolerance class
P4A
Seal type
Sealed
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
15 °
Ball & Washer Dimensions
Ball diameter
14.288 mm
Ball quantity
15
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
32850 lbf
Radial static load rating
38250 lbf
Limiting speed
34 X 1000 rpm
Lubrication
Grease
Matched arrangement
Quadruplex Back-to-Back (QBC)
Number of bearings in matched set
4
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.
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S7211 CD/P4AQBCC Bearing Product Overview & Core Advantages
The S7211 CD/P4AQBCC is a metric precision angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. This quadruplex back-to-back (QBC) matched set delivers superior performance under combined radial and axial loads. Manufactured to P4A tolerance class with a 15° contact angle and moderate preload (Class C), it provides high running accuracy, excellent stability, and is ideal for high-speed, high-rigidity spindle systems.
S7211 CD/P4AQBCC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| S7211 | Basic bearing designation, 55mm bore, 100mm OD, 84mm width. |
| CD | Contact angle of 15°. |
| P4A | High precision tolerance class, exceeding ABEC 7/ISO P4 standards. |
| QBCC | Indicates a Quadruplex (4-bearing) Back-to-Back matched set with moderate preload (Class C). |
S7211 CD/P4AQBCC Bearing Structural Features & Performance Benefits
- Exceptional Rigidity and Stability: The quadruplex back-to-back arrangement creates an extremely rigid bearing system that effectively resists moment loads and shaft deflection, ensuring precise rotational accuracy.
- High Load Capacity: Engineered to handle significant combined radial and axial loads simultaneously, making it suitable for complex loading conditions.
- Optimized High-Speed Performance: The phenolic resin cage offers low weight and excellent performance at high speeds, contributing to the high limiting speed of 34,000 rpm. The 15° contact angle is ideal for high-speed applications where axial load is present.
- Precision and Longevity: Manufactured from chrome steel for rings and balls, and built to P4A precision tolerances, this bearing ensures smooth, quiet operation and extended service life. The set is pre-lubricated with grease for immediate use.
S7211 CD/P4AQBCC Bearing Typical Application Areas
This bearing is specifically designed for high-performance machinery requiring the ultimate in precision and rigidity. Key applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling machines, high-frequency motor spindles.
- Robotics: High-accuracy joints and actuators.
- Advanced Industrial Pumps and Compressors.
