71906 ACD/P4ADT
71900 Series Super Precision Angular Contact Ball Bearings
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71906 ACD/P4ADT Bearing Product Overview & Core Advantages
The 71906 ACD/P4ADT is a precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and performance. This duplex tandem (DT) arrangement bearing set is preloaded and manufactured to P4A tolerance class, ensuring superior running accuracy and rotational precision. Its primary advantage lies in its ability to handle high combined loads (radial and axial) in one direction with maximum rigidity, making it ideal for high-speed spindles and precision machinery where minimal deflection is critical.
71906 ACD/P4ADT Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71906 | Basic bearing designation, indicating a light series, 30mm bore angular contact bearing. |
| AC | Angular Contact design with a 25° contact angle. |
| D | Duplex Tandem (DT) arrangement. Two bearings are mounted together to share the load in the same direction. |
| P4A | Indicates a high-precision tolerance class, with very tight limits on bore, outside diameter, and width tolerances for superior running accuracy. |
71906 ACD/P4ADT Bearing Structural Features & Performance Benefits
High Rigidity and Load Capacity: The duplex tandem arrangement combines two bearings to significantly increase axial and radial stiffness, allowing the set to withstand heavy combined loads in one direction without excessive deformation.
Precision Performance: Manufactured to P4A tolerance class with a phenolic cage, this bearing ensures minimal vibration and high rotational accuracy, which is essential for high-speed applications.
Optimized for Speed: The lightweight phenolic cage and optimized internal geometry contribute to a high limiting speed of 83,000 rpm, making it suitable for very fast rotational equipment.
Material and Lubrication: Constructed from chrome steel for both rings and balls, the bearing offers high durability and fatigue resistance. It comes pre-lubricated for immediate operation within a specified temperature range.
71906 ACD/P4ADT Bearing Typical Application Areas
This high-precision, preloaded duplex bearing set is specifically engineered for applications requiring extreme accuracy and high-speed capability. Typical uses include:
- Machine Tool Spindles (High-speed milling, grinding)
- Precision Spindles in PCB drilling and routing machines
- High-frequency Main Shafts
- Other precision rotary equipment where maximum rigidity and high-speed performance are paramount.
