7211 ACD/P4ADBDGMM
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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7211 ACD/P4ADBDGMM Bearing Product Overview & Core Advantages
The 7211 ACD/P4ADBDGMM is a precision duplex angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. This matched back-to-back (DB) arrangement is preloaded to Class D (Heavy), providing superior stiffness and minimizing axial and radial runout. It excels at handling combined loads (radial and axial) simultaneously, making it ideal for high-precision spindles and machinery where positional accuracy is critical. Manufactured to P4A tolerance class, this bearing ensures consistent, high-performance operation in rigorous environments.
7211 ACD/P4ADBDGMM Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7211 | Basic bearing series, 55 mm bore, 100 mm OD, 42 mm width |
| ACD | Angular Contact design with a 25° contact angle |
| P4A | High precision tolerance class, exceeding ABEC 7 standards |
| DB | Duplex Back-to-Back mounting arrangement |
| DGMM | Universal matching designation; bearings are supplied as a pre-matched set |
7211 ACD/P4ADBDGMM Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The duplex back-to-back configuration with a heavy preload (Class D) creates an extremely rigid bearing system, effectively resisting moment loads and maintaining shaft positioning under combined radial and axial loads. The 25° contact angle is optimized for substantial axial load capacity.
Precision & Speed: Built to P4A tolerance class with a phenolic cage, this bearing ensures smooth operation and is capable of achieving a limiting speed of 34,000 rpm. The precision-ground chrome steel components contribute to low vibration and noise levels.
Durability & Reliability: The open seal type allows for efficient lubrication management. The bearing is pre-lubricated with grease, suitable for a temperature range of -30°C to 110°C, ensuring reliable performance from startup.
7211 ACD/P4ADBDGMM Bearing Typical Application Areas
This high-precision, high-rigidity bearing is engineered for advanced applications, including:
- Machine Tool Spindles (High-speed milling, grinding, and turning centers)
- Precision Gearboxes
- High-Frequency Motors
- Industrial Pumps and Compressors
- Robotic Arm Joints and Precision Positioning Systems
