7211 ACD/P4ADBB
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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7211 ACD/P4ADBB Bearing Product Overview & Core Advantages
The 7211 ACD/P4ADBB is a precision duplex angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. This metric system bearing is configured in a back-to-back (DB) arrangement and comes with a light preload (Class B), making it ideal for managing combined loads—simultaneously supporting substantial radial and axial forces in both directions. Its open seal type allows for optimal lubrication management in controlled environments. Manufactured to a P4A tolerance class, it guarantees ultra-precise running accuracy, minimal vibration, and high operational reliability, establishing it as a superior choice for high-performance machinery.
7211 ACD/P4ADBB Bearing Model Code Explained, Specifications & Naming Convention
- 7211: Basic designation indicating a bearing with a 55 mm bore diameter.
- AC: Signifies Angular Contact design with a 25° contact angle.
- D: Denotes that the bearing is part of a Duplex (pre-mounted pair) set.
- P4A: Specifies an extremely high precision tolerance class, exceeding ABEC 7 standards.
- DBB: Indicates the specific Duplex Back-to-Back mounting arrangement, which provides high moment rigidity.
7211 ACD/P4ADBB Bearing Structural Features & Performance Benefits
- High Rigidity and Stability: The duplex back-to-back (DB) arrangement creates a wide, rigid support system that effectively resists moment loads and shaft misalignment, ensuring exceptional operational stability.
- Superior Load Capacity: The 25° contact angle and optimized internal geometry enable the bearing to handle significant combined radial and axial loads from both directions simultaneously.
- Precision and High-Speed Capability: Manufactured to P4A tolerance standards with a lightweight phenolic resin cage, the bearing achieves smooth operation, low vibration, and a high limiting speed of 34,000 rpm, suitable for demanding high-speed applications.
- Durable Material Construction: Both rings and balls are made from high-grade chrome steel, providing excellent wear resistance and long service life under heavy loads.
7211 ACD/P4ADBB Bearing Typical Application Areas
- Machine Tool Spindles: For milling, grinding, and turning centers requiring high accuracy and rigidity.
- Precision Gearboxes: In industrial automation and robotics where backlash and deflection must be minimized.
- High-Frequency Motors and Spindles: Applications demanding smooth operation at very high rotational speeds.
- Medical and Laboratory Equipment: Such as centrifuges and precision scanners.
- Aerospace Actuation Systems: Where reliability and precision under load are critical.
