S7211 ACD/P4ADBC
Sealed Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
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S7211 ACD/P4ADBC Bearing Product Overview & Core Advantages
The S7211 ACD/P4ADBC is a precision duplex back-to-back angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. This P4A tolerance class bearing is preloaded and matched as a set, enabling it to handle combined radial and axial loads simultaneously with high running accuracy. Its compact design and moderate preload (Class C) make it ideal for high-speed spindles and other precision machinery where high rigidity and reliable performance are critical.
S7211 ACD/P4ADBC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| S | Indicates a phenolic resin cage. |
| 7 | Denotes a contact angle of 25°. |
| 211 | Standard bore diameter (55mm), outside diameter (100mm), and width (42mm) dimensions. |
| AC | Angular Contact design. |
| D | Duplex Back-to-Back (DB) arrangement. |
| P4A | High precision tolerance class, exceeding ABEC-7 standards, with specific running accuracy requirements. |
| DBC | Specifies a moderate preload (Class C) applied to the duplex back-to-back set. |
S7211 ACD/P4ADBC Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The duplex back-to-back (DB) arrangement creates a rigid bearing system that effectively resists moment loads and can handle significant combined radial and axial loads from both directions. The 25° contact angle is optimized for sustaining high axial loads.
High-Speed Performance: The lightweight phenolic cage ensures stable operation and low centrifugal forces, contributing to the high limiting speed of 34,000 rpm. The bearing is pre-lubricated with grease suitable for its operational temperature range.
Precision & Accuracy: Manufactured to P4A tolerance class with tight dimensional tolerances on the bore, outside diameter, and width, this bearing guarantees minimal runout and high rotational accuracy for precision applications.
Sealed & Pre-Lubricated: As a sealed bearing, it is protected from contamination and is pre-lubricated for long-term, maintenance-free operation in its designated application environment.
S7211 ACD/P4ADBC Bearing Typical Application Areas
The S7211 ACD/P4ADBC is engineered for high-performance applications, including:
- Machine Tool Spindles (e.g., for milling, grinding, and turning centers)
- High-Frequency Motors and Spindles
- Precision Gearboxes
- Industrial Pumps and Compressors
- Other machinery requiring high rigidity, high speed, and precision.
