7212 ACD/P4ADBA
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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Product Overview and Core Advantages
The 7212 ACD/P4ADBA is a precision duplex back-to-back angular contact ball bearing designed for applications requiring exceptional rigidity and accuracy. This P4A tolerance class bearing features an extra light preload (Class A) and is supplied as a matched set, enabling it to handle combined radial and axial loads simultaneously with high precision. Its duplex back-to-back configuration provides high rigidity and excellent moment load capacity, making it ideal for high-speed, high-precision machinery where positioning accuracy is critical.
7212 ACD/P4ADBA Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning | Performance Advantage |
|---|---|---|
| ACD | Angular Contact Duplex Back-to-Back | Provides high rigidity and moment load capacity |
| P4A | High Precision Tolerance Class | Ensures exceptional running accuracy and dimensional stability |
| DB | Duplex Back-to-Back Arrangement | Optimized for combined load applications |
Structural Features and Performance Benefits
High Rigidity Design: The duplex back-to-back configuration creates a rigid bearing system that effectively resists moment loads and maintains precise shaft positioning under combined radial and axial loads.
Precision Performance: Manufactured to P4A tolerance class with bore and outside diameter tolerances of -0.004mm to 0, ensuring exceptional running accuracy and dimensional stability for precision applications.
High-Speed Capability: The phenolic cage material and optimized internal design enable a limiting speed of 36,000 rpm, making it suitable for high-speed applications requiring minimal vibration.
Enhanced Load Capacity: With a 25° contact angle and 16 precision balls of 14.288mm diameter, this bearing delivers a radial dynamic load rating of 19,890 lbf and radial static load rating of 20,250 lbf for demanding applications.
7212 ACD/P4ADBA Bearing Typical Application Areas
- Machine Tool Spindles: High-precision milling, grinding, and turning centers requiring exceptional rigidity and accuracy
- Precision Gearboxes: Industrial transmission systems demanding high-speed performance and load capacity
- High-Speed Motors: Electric motors and spindles operating at elevated speeds with precise positioning requirements
- Industrial Pumps and Compressors: Applications requiring reliable performance under combined radial and axial loads
- Robotics and Automation: Precision joints and positioning systems where accuracy and rigidity are critical
