7212 ACD/P4ADFA
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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7212 ACD/P4ADFA Bearing Product Overview & Core Advantages
The 7212 ACD/P4ADFA is a precision duplex angular contact ball bearing designed for applications requiring exceptional rotational accuracy and rigidity. This matched set features a Face-to-Face (DF) duplex arrangement and is manufactured to the stringent P4A tolerance class, ensuring superior running precision. Its primary advantage lies in its ability to accommodate combined radial and axial loads simultaneously, making it ideal for high-speed, high-rigidity spindles and precision machinery where stability and accuracy are paramount.
7212 ACD/P4ADFA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7212 | Basic bearing series, indicating a 60 mm bore, 110 mm OD, and 44 mm width. |
| AC | Angular Contact design with a 25° contact angle. |
| D | Duplex Face-to-Face (DF) preloaded pair. |
| P4A | High precision tolerance class (superior to ABEC 7), ensuring minimal runout and vibration. |
| DFA | Specific internal design and Extra light preload (Class A) for optimal stiffness and speed performance. |
7212 ACD/P4ADFA Bearing Structural Features & Performance Benefits
High Rigidity & Stability: The duplex DF arrangement provides significantly increased system rigidity and moment load capacity compared to a single bearing, essential for maintaining precision under heavy cutting forces or complex loads.
Superior Load Capacity: The 25° contact angle is optimized to handle substantial combined radial and axial loads in both directions, a key feature of angular contact ball bearings.
High-Speed Capability: The phenolic resin cage offers low weight and excellent performance at high speeds, contributing to the bearing's limiting speed of 36,000 rpm. The open design facilitates efficient lubrication and cooling.
Precision Engineering: Manufactured to P4A tolerance class with tight dimensional control on bore, OD, and width, this bearing ensures minimal runout and superior rotational accuracy for demanding applications.
7212 ACD/P4ADFA Bearing Typical Application Areas
The 7212 ACD/P4ADFA is engineered for high-performance machinery where precision, speed, and rigidity are non-negotiable. Key applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling, engraving, and high-frequency motor spindles.
- Robotics: High-accuracy rotary joints and arm actuators.
- Medical Equipment: Dental handpieces and high-speed surgical tools.
