71912 ACD/P4ADT
71900 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
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71912 ACD/P4ADT Bearing Product Overview & Core Advantages
The 71912 ACD/P4ADT is a precision angular contact ball bearing featuring a duplex tandem (DT) arrangement and P4A tolerance class. This configuration is engineered to deliver exceptional high-speed performance and superior axial rigidity. Its primary advantage lies in its ability to handle significant combined loads (radial and axial) in one direction, making it ideal for applications demanding high precision and rotational accuracy. The preloaded tandem setup ensures minimal axial play and outstanding operational stability.
71912 ACD/P4ADT Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71912 | Basic bearing series and size designation. |
| AC | Angular Contact design with a 25° contact angle. |
| D | Duplex bearing (two single bearings supplied as a set). |
| P4A | High precision tolerance class, exceeding ABEC 7/ISO P4, with specific focus on axial runout accuracy. |
| DT | Duplex Tandem arrangement. The two bearings are mounted in tandem to increase axial load capacity and rigidity in one direction. |
71912 ACD/P4ADT Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The duplex tandem arrangement combines two bearings to create a highly rigid system capable of supporting very high axial loads in one direction. The 25° contact angle is optimized for this load type.
High-Speed Performance: The lightweight phenolic resin cage minimizes centrifugal forces, reduces friction, and contributes to the high limiting speed of 33,000 rpm. This makes it a true high-speed bearing.
Precision Engineering: Manufactured to P4A tolerance class, this bearing guarantees extremely tight dimensional and running accuracy, which is critical for applications requiring minimal vibration and high positional accuracy.
Material Quality: Constructed from high-grade chrome steel for both rings and balls, ensuring long service life and consistent performance under demanding conditions.
71912 ACD/P4ADT Bearing Typical Application Areas
The 71912 ACD/P4ADT is designed for high-performance machinery where precision, speed, and axial rigidity are paramount. Key applications include:
- Machine Tool Spindles (High-speed milling, grinding)
- Precision Spindles for PCB drilling and routing
- High-frequency Main Shafts
- Axial compressors and pumps
- Advanced robotics and automation systems
