7211 ACD/P4AQGB
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7211 ACD/P4AQGB
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
Universal Matchable (SU)
Number of bearings in matched set
4
Universal matching bearing
Universal Matchable (SU)
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
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7211 ACD/P4AQGB Bearing Product Overview & Core Advantages
The 7211 ACD/P4AQGB is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and reliability. This universal matchable bearing is part of a matched set of 4, allowing for precise preload configuration when mounted in pairs. Its 25° contact angle and P4A tolerance class enable it to handle significant combined loads (radial and axial) simultaneously with high rigidity. The light preload (Class B) ensures smooth operation and minimal deflection, making it ideal for high-speed applications up to 34,000 rpm. Manufactured from chrome steel with a phenolic cage, it offers robust performance across a wide temperature range from -30°C to 110°C.
7211 ACD/P4AQGB Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning | Performance Implication |
|---|---|---|
| ACD | 25° Contact Angle, Universal Matchable Design | Optimized for combined radial and axial loads; bearings can be mounted in any combination (face-to-face, back-to-back, or tandem) |
| P4A | High Precision Tolerance Class | Superior running accuracy, reduced vibration, and enhanced positional precision for critical applications |
| QGB | Special Grease Lubrication | Pre-lubricated for immediate operation, providing reliable performance across the specified temperature range |
7211 ACD/P4AQGB Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The angular contact design with a 25° contact angle and double-row ball complement (15 balls per row) provides superior stiffness and enables the bearing to support substantial combined loads. With a dynamic load rating of 31,500 lbf and static load rating of 36,675 lbf, it ensures long-term operational reliability under heavy loads.
- Precision High-Speed Performance: The phenolic resin cage offers excellent dimensional stability and low friction, contributing to the high limiting speed of 34,000 rpm. The P4A precision class ensures minimal runout and vibration, which is critical for maintaining accuracy at high rotational speeds.
- Optimized Universal Matching: As a Universal Matchable (SU) bearing supplied in a set of 4, it provides maximum flexibility in mounting configurations. This allows for precise preload setting (Light / Class B in this case) to achieve the desired stiffness and thermal management in the application.
- Durable Material Construction: Both rings and balls are made from high-grade chrome steel, providing excellent wear resistance and fatigue life. The open seal design facilitates relubrication if required for extended service life.
7211 ACD/P4AQGB Bearing Typical Application Areas
- Machine Tool Spindles: High-precision machining centers, grinding spindles, and CNC lathes requiring exceptional accuracy and rigidity
- High-Speed Industrial Machinery: Pumps, compressors, and gearboxes operating at elevated speeds where combined loads are present
- Precision Motion Systems: Robotics, semiconductor manufacturing equipment, and medical devices demanding smooth, precise rotational movement
- Aerospace & Defense Systems: Actuators, control systems, and instrumentation requiring reliable performance under varying load conditions
