7211 ACDGB/P4A
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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Product Overview and Core Advantages
The 7211 ACDGB/P4A is a precision angular contact ball bearing designed for applications requiring exceptional rotational accuracy and high-speed performance. As a single bearing with Universal Matchable (SU) designation, it can be paired with identical bearings in various arrangements to achieve optimal preload (Light / Class B) and system rigidity. Its 25° contact angle enables it to efficiently handle combined loads—significant radial forces alongside substantial axial loads in one direction. Manufactured to P4A tolerance class, it guarantees minimal dimensional variation and smooth operation, making it ideal for high-precision, high-reliability machinery.
7211 ACDGB/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| AC | Angular Contact design, optimized for combined loads. |
| DGB | Universal Matchable (SU) bearing, designed to be mounted in pairs or sets (in this case, a set of 3) to achieve specific preload and rigidity. |
| P4A | High precision tolerance class, exceeding ABEC 7 standards, ensuring extremely tight dimensional control for superior running accuracy. |
Structural Features and Performance Benefits
Optimized Internal Geometry: The 25° contact angle and carefully calculated ball diameter (14.288 mm) and quantity (15) are engineered to provide an excellent balance between high axial load capacity and high-speed capability.
High-Speed Phenolic Cage: The phenolic resin cage offers low weight, high strength, and excellent performance at the limiting speed of 34,000 rpm, reducing centrifugal forces and friction for cooler, more efficient operation.
Superior Rigidity and Load Rating: The robust construction results in a high dynamic load rating of 11,858 lbf and a static load rating of 9,112 lbf, ensuring long service life and minimal deformation under load for enhanced machine tool accuracy.
Precision Materials and Tolerances: Manufactured from high-grade chrome steel for rings and balls, and held to P4A tolerances with tight bore, OD, and width tolerances, this bearing delivers consistent, reliable performance.
7211 ACDGB/P4A Bearing Typical Application Areas
- Machine Tool Spindles: High-speed milling, grinding, and turning spindles where precision, rigidity, and speed are critical.
- Precision Gearboxes: Applications requiring accurate shaft positioning and the ability to handle combined radial and axial loads.
- High-Frequency Motors and Spindles: Electric motors and motorized spindles operating at very high rotational speeds.
- Industrial Pumps and Compressors: For shaft support in high-performance pumps and compressors demanding reliability and efficiency.
