71940 ACD/P4AH1
71900 Series Super Precision Angular Contact Ball Bearings
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71940 ACD/P4AH1 Bearing Product Overview & Core Advantages
The 71940 ACD/P4AH1 is a high-precision angular contact ball bearing designed for applications requiring exceptional rotational accuracy and rigidity. Engineered to simultaneously handle combined radial and axial loads, this bearing features a 25° contact angle and is supplied with a preload (P4AH1) for enhanced system stiffness and precise shaft positioning. Its P4A tolerance class ensures superior dimensional and running accuracy, making it ideal for high-speed, high-reliability machinery where minimal runout and vibration are critical.
71940 ACD/P4AH1 Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71940 | Basic bearing series and size designation (200mm bore, 280mm OD) |
| AC | Angular Contact design with a 25° contact angle |
| D | Signifies a matched set of two bearings for optimized performance |
| P4A | High Precision Tolerance Class for superior dimensional and running accuracy |
| H1 | Indicates a specific preload level applied to the bearing set |
71940 ACD/P4AH1 Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The angular contact design and 25° contact angle enable the bearing to efficiently support substantial combined radial and axial loads in one direction. The matched set arrangement (D) and applied preload (H1) significantly increase system stiffness, reducing deflection under load for superior positioning accuracy.
High-Speed Performance: Featuring a lightweight phenolic resin cage, this bearing achieves a high limiting speed of 6,300 rpm. The cage design minimizes centrifugal forces and ensures stable operation at elevated rotational speeds.
Precision Engineering: Manufactured to P4A tolerance class, this bearing guarantees tight control over internal clearances and running geometry, resulting in smooth, quiet operation with minimal vibration—a critical requirement for precision applications.
Material & Lubrication: Constructed from chrome steel for both rings and balls, the bearing offers high durability and fatigue resistance. It is pre-lubricated for immediate operation within a temperature range of -30°C to 110°C.
71940 ACD/P4AH1 Bearing Typical Application Areas
- Machine Tool Spindles: For high-speed milling, grinding, and turning centers requiring extreme precision and rigidity.
- Precision Gearboxes: In industrial automation and robotics where accurate motion control is essential.
- High-Frequency Motors & Spindles: Supporting shafts in applications demanding high rotational speeds and low vibration.
- Medical Equipment: In advanced diagnostic imaging systems and surgical tools.
- Aerospace & Defense Systems: For guidance systems, actuators, and other critical rotating assemblies.
