7211 CD/P4ADT
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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7211 CD/P4ADT Bearing Product Overview & Core Advantages
The 7211 CD/P4ADT is a precision angular contact ball bearing configured in a Duplex Tandem (DT) arrangement. This matched pair is designed to deliver exceptional performance in applications requiring high rigidity and the capacity to handle significant axial loads in one direction. Manufactured to P4A tolerance class, it offers superior running accuracy, making it ideal for high-speed spindles and other precision machinery where reliability and minimal runout are critical.
7211 CD/P4ADT Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7211 | Basic bearing series, indicating a 55 mm bore, 100 mm OD, and 42 mm width. |
| C | Designates a 15° contact angle, optimized for high-speed operation and axial load capacity. |
| D | Indicates the bearing is part of a Duplex (matched pair) set. |
| P4A | Specifies a high precision tolerance class, exceeding ABEC 7 (ISO Class 4) standards for enhanced running accuracy. |
| DT | Defines the Duplex Tandem arrangement, where two bearings are mounted together to increase axial load capacity in a single direction. |
7211 CD/P4ADT Bearing Structural Features & Performance Benefits
High Rigidity and Load Capacity: The Duplex Tandem (DT) arrangement creates a highly rigid bearing system capable of supporting high combined loads, particularly substantial thrust loads in one direction. The 15° contact angle is engineered to efficiently manage these axial forces.
Precision and High-Speed Performance: Built to P4A tolerance class, this bearing ensures minimal vibration and precise shaft positioning. The lightweight phenolic cage contributes to lower centrifugal forces, enabling a high limiting speed of 34,000 rpm, which is essential for high-speed applications like machine tool spindles.
Optimized Internal Geometry: With 15 precision-ground chrome steel balls of 14.288 mm diameter, the bearing provides smooth operation and long service life under demanding conditions.
Preload and Matched Set: Supplied as a pre-loaded matched set of 2 bearings, this configuration eliminates internal clearance, ensuring immediate stiffness and accurate rotational performance upon installation.
7211 CD/P4ADT Bearing Typical Application Areas
The 7211 CD/P4ADT is engineered for high-performance applications, including:
- Machine Tool Spindles (milling, grinding, and turning centers)
- High-Frequency Motors
- Precision Robotics and Automation Equipment
- High-Speed Pumps and Compressors
