S7211 ACDGB/P4A
Sealed Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
S7211 ACDGB/P4A
Basic Information
System of measurement
Metric
Weight
0.62 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
21 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
11858 lbf
Radial static load rating
9112 lbf
Limiting speed
34 X 1000 rpm
Lubrication
Grease
Matched arrangement
Single
Number of bearings in matched set
2
Universal matching bearing
Universal Matchable (SU)
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 ACDGB/P4A Bearing Product Overview & Core Advantages
The S7211 ACDGB/P4A is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and reliability. As a single bearing from a Universal Matchable (SU) pair, it excels at simultaneously handling combined radial and axial loads. Manufactured to the stringent P4A tolerance class, it offers superior running accuracy, high rigidity, and is pre-lubricated with grease for long-term, maintenance-free operation, making it ideal for high-speed spindles and other precision machinery.
S7211 ACDGB/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7211 | Basic bearing series, indicating a metric bearing with a 55 mm bore, 100 mm OD, and 21 mm width. |
| AC | Angular Contact design with a 25° contact angle, optimized for combined loads. |
| DGB | Duplex arrangement designation (Back-to-Back), indicating this is a single bearing intended to be mounted in a specific duplex pair (DB) configuration. |
| P4A | Super precision tolerance class, exceeding ABEC 7 standards, ensuring extremely tight dimensional and running accuracy for high-performance applications. |
S7211 ACDGB/P4A Bearing Structural Features & Performance Benefits
- High Rigidity and Load Capacity: The angular contact design with a 25° contact angle and duplex (DGB) configuration provides high rigidity, enabling the bearing to effectively support significant combined radial and axial loads.
- Superior High-Speed Performance: The lightweight phenolic resin cage minimizes centrifugal forces, contributing to a high limiting speed of 34,000 rpm. This makes it suitable for high-speed spindle applications.
- Exceptional Precision: Manufactured to P4A tolerance class with very tight bore, OD, and width tolerances, this bearing guarantees minimal runout and vibration for superior operational accuracy.
- Optimized for Matched Sets: As a Universal Matchable (SU) bearing, it is designed to be paired with another identical bearing to form a pre-adjusted set, simplifying installation and ensuring optimal preload and performance.
- Durable Construction: Components made from chrome steel and a robust phenolic cage ensure long service life and reliability under demanding conditions.
S7211 ACDGB/P4A Bearing Typical Application Areas
This precision angular contact ball bearing is ideally suited for applications where high speed, accuracy, and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles (e.g., milling, grinding, and lathe spindles)
- High-Frequency Motors and Spindle Drives
- Precision Gearboxes
- Robotics and Automation equipment
- Medical Equipment (e.g., high-speed dental handpieces)
- Aerospace instrumentation and control systems
