7210 ACD/P4ADBC
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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7210 ACD/P4ADBC Bearing Product Overview & Core Advantages
The 7210 ACD/P4ADBC is a precision duplex angular contact ball bearing set, engineered for applications demanding exceptional rotational accuracy and high rigidity. This matched pair is pre-configured in a Back-to-Back (DB) arrangement, enabling it to withstand significant combined loads—both radial and bidirectional axial loads—simultaneously. Manufactured to the stringent P4A tolerance class, it offers superior running accuracy, making it ideal for high-speed spindles and other precision machinery where minimal runout and high operational reliability are critical. The moderate preload (Class C) ensures optimal stiffness right from installation, reducing deflection and enhancing system performance.
7210 ACD/P4ADBC Bearing Model Code Explained, Specifications & Naming Convention
- 7210: Basic bearing designation (70mm Bore, 90mm OD, 40mm Width).
- AC: Angular Contact design with a 25° contact angle.
- D: Indicates a Duplex (two-bearing) set.
- P4A: Denotes a super-precision tolerance class, exceeding standard ABEC-7/ISO P4 specifications for enhanced accuracy.
- DB: Specifies the Back-to-Back mounting arrangement of the duplex set.
- C: Indicates the Moderate preload level applied to the matched set.
7210 ACD/P4ADBC Bearing Structural Features & Performance Benefits
High Rigidity and Load Capacity: The duplex back-to-back configuration creates a wide, rigid support system that effectively resists overturning moments and complex combined loads. This setup provides high operational stiffness, which is crucial for maintaining precision under load.
Precision Performance: Built to P4A tolerance class with a 25° contact angle, this bearing ensures extremely low vibration and high running accuracy, essential for applications like machine tool spindles.
High-Speed Capability: The lightweight, robust phenolic resin cage minimizes centrifugal forces, reduces friction, and allows for a high limiting speed of 46,000 rpm, making it a true high-speed bearing.
Durability and Reliability: Manufactured from high-grade chrome steel for both rings and balls, the bearing offers excellent fatigue life and wear resistance. It comes pre-lubricated for immediate operation.
7210 ACD/P4ADBC Bearing Typical Application Areas
The 7210 ACD/P4ADBC is ideally suited for high-performance applications where precision, speed, and rigidity are non-negotiable. Key industries and equipment include:
- Machine Tool Spindles: For CNC machining centers, grinding spindles, and milling heads.
- Precision Grinding Equipment: Internal and external grinding machines.
- High-Frequency Motors and Spindles: Where high rotational speeds are required.
- Industrial Pumps and Compressors: For applications requiring accurate shaft positioning.
- Robotics and Automation: In high-accuracy rotary joints and arm assemblies.
