7213 ACD/P4ADFA
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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Main Dimensions
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7213 ACD/P4ADFA Bearing Product Overview & Core Advantages
The 7213 ACD/P4ADFA is a precision duplex angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. This matched bearing set features a Face-to-Face (DF) arrangement and an Extra Light (A) preload, making it ideal for high-precision spindles and other machinery where minimal deflection under combined loads is critical. Its P4A tolerance class ensures superior running accuracy, while the phenolic cage contributes to smooth operation at high speeds.
7213 ACD/P4ADFA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7213 | Basic bearing designation: 65 mm bore, 120 mm OD, 46 mm width. |
| AC | Angular Contact design with a 25° contact angle. |
| D | Duplex (two bearings supplied as a matched set). |
| P4A | High precision tolerance class (P4) with specific accuracy enhancements for spindle applications. |
| DF | Matched arrangement: Face-to-Face (DF). This configuration provides high moment rigidity. |
| A | Preload level: Extra Light (Class A), optimized for high-speed operation with minimal friction and heat generation. |
7213 ACD/P4ADFA Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The duplex DF arrangement creates a highly rigid bearing system capable of withstanding significant combined radial and axial loads from both directions. This setup is essential for applications requiring precise shaft positioning and minimal runout.
High-Speed Performance: The lightweight phenolic resin cage ensures excellent dimensional stability and low friction, enabling smooth operation up to the limiting speed of 36,000 rpm. The 25° contact angle provides an optimal balance between axial load capacity and speed capability.
Precision Engineering: Manufactured to P4A tolerance class, this bearing guarantees extremely tight dimensional and running accuracy, which is paramount for applications like machine tool spindles to achieve superior surface finishes and machining precision.
Superior Material: Constructed from high-grade chrome steel for both rings and balls, ensuring long service life and consistent performance under demanding conditions.
7213 ACD/P4ADFA Bearing Typical Application Areas
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Grinding Spindles: Applications requiring extreme rotational accuracy and rigidity.
- High-Frequency Motors: Spindles for PCB drilling and other high-RPM applications.
- Robotic Drives: Precision joints and arm actuators.
- Medical Equipment: High-speed dental handpieces and imaging device rotors.
