71940 ACD/P4ADBB
71900 Series Super Precision Angular Contact Ball Bearings
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71940 ACD/P4ADBB Bearing Product Overview & Core Advantages
The 71940 ACD/P4ADBB is a precision duplex angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. This matched set features a back-to-back (DB) arrangement and a P4A super-precision tolerance class, making it ideal for high-speed spindles and other precision machinery. Its core advantage lies in its ability to support combined loads (radial and axial) simultaneously while providing high running accuracy and system stiffness. The light preload (Class B) ensures minimal deflection under operational stresses, contributing to superior performance and longevity in demanding environments.
71940 ACD/P4ADBB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71940 | Basic bearing series and size designation. |
| AC | Angular Contact design with a 25° contact angle. |
| D | Duplex (two single bearings as a set). |
| P4A | Super-precision tolerance class, tighter than ABEC 7/ISO P4, ensuring extremely high running accuracy. |
| DB | Matched arrangement: Back-to-Back. This configuration provides high moment rigidity and is optimal for withstanding overturning moments. |
| B | Specifies the light preload (Class B) applied to the matched set. |
71940 ACD/P4ADBB Bearing Structural Features & Performance Benefits
High Rigidity and System Stability: The duplex back-to-back (DB) arrangement significantly increases the bearing's resistance to moment loads, providing exceptional system stiffness and shaft positioning accuracy. This is critical for applications like machine tool spindles where deflection must be minimized.
Superior Load Capacity: With a 25° contact angle and a dynamic load rating of 73,125 lbf, this bearing is engineered to handle significant combined radial and axial loads efficiently.
High-Speed Performance: The use of a lightweight, durable phenolic resin cage reduces centrifugal forces, allowing for a high limiting speed of 16,250 rpm. The open design facilitates efficient lubrication and heat dissipation.
Precision Engineering: Manufactured to P4A tolerance class with tight dimensional controls on the bore diameter and outside diameter, this bearing guarantees smooth, quiet, and vibration-free operation.
71940 ACD/P4ADBB Bearing Typical Application Areas
This high-precision duplex bearing is specifically designed for advanced machinery where accuracy, speed, and rigidity are paramount. Key applications include:
- High-Speed Machine Tool Spindles (e.g., for milling, grinding, and turning centers)
- Precision Grinding Spindles
- High-frequency Main Spindles
- Other high-performance rotational systems in aerospace and semiconductor manufacturing equipment.
