S7211 ACD/P4ADBB
Sealed Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
S7211 ACD/P4ADBB
Basic Information
System of measurement
Metric
Weight
1.25 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
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
Grease
Matched arrangement
Duplex Back-to-Back (DB)
Number of bearings in matched set
2
Universal matching bearing
No (Standard)
Preload
Light / Class B
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
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In Stock
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S7211 ACD/P4ADBB Bearing Product Overview & Core Advantages
The S7211 ACD/P4ADBB is a precision duplex angular contact ball bearing designed for high-performance applications. This back-to-back (DB) matched pair configuration offers exceptional high rigidity and stability, making it ideal for supporting combined loads (radial and bidirectional axial loads) simultaneously. Manufactured to P4A tolerance class and preloaded to Light / Class B, it delivers superior running accuracy and is optimized for high-speed operation up to 34,000 rpm. Its compact design and sealed construction ensure reliable, long-lasting performance in demanding environments.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| S7211 | Basic bearing series, indicating a 55 mm bore, 100 mm OD, and 42 mm width. |
| ACD | Angular Contact design with a 25° contact angle and Duplex (DB) Back-to-Back arrangement. |
| P4A | Indicates a high-precision tolerance class (superior to ABEC 7), ensuring minimal runout and vibration. |
| DBB | Specifies the bearing is a factory-matched Duplex Back-to-Back set, providing pre-set axial rigidity. |
S7211 ACD/P4ADBB Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The back-to-back duplex arrangement creates a wide effective spread, significantly increasing moment rigidity and operational stability under complex loads.
- Superior Load Capacity: Engineered with a 25° contact angle and high-grade chrome steel components, this bearing efficiently handles significant combined radial and axial loads from both directions.
- Optimized High-Speed Performance: The lightweight phenolic resin cage reduces centrifugal forces, while the precision P4A grading and optimized internal geometry contribute to a high limiting speed of 34,000 rpm.
- Sealed & Pre-Lubricated: The sealed design with grease lubrication effectively excludes contaminants and provides long-term, maintenance-free operation within a temperature range of -30°C to 110°C.
S7211 ACD/P4ADBB Bearing Typical Application Areas
This bearing is ideally suited for high-precision, high-speed machinery, including:
- Machine Tool Spindles
- High-Frequency Electric Spindles
- Precision Grinding Machines
- Industrial Pumps and Compressors
- Robotic Arm Joints and Precision Gearboxes
