71944 CD/P4ADBB
71900 Series Super Precision Angular Contact Ball Bearings
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71944 CD/P4ADBB Bearing Product Overview & Core Advantages
The 71944 CD/P4ADBB is a metric precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. This duplex back-to-back (DB) arrangement provides superior stiffness and moment load capacity, making it ideal for high-precision spindles. Preloaded to Light / Class B, it ensures minimal axial and radial play, delivering consistent performance under combined loads. Manufactured to the exacting P4A tolerance class, this bearing guarantees ultra-precise running accuracy for the most critical machinery.
71944 CD/P4ADBB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71944 | Basic bearing series, defining the internal geometry and size. |
| C | Specific internal design with a 15° contact angle. |
| D | Indicates the bearing is part of a duplex pair. |
| P4A | The tolerance class, signifying very high precision for dimensional and running accuracy. |
| DB | The matched arrangement: Back-to-Back (DB). This configuration provides high rigidity against moment loads. |
| B | Specifies the preload level: Light (Class B). |
71944 CD/P4ADBB Bearing Structural Features & Performance Benefits
- High Rigidity & Moment Load Capacity: The duplex back-to-back (DB) arrangement creates a wide, stable support system that significantly increases bearing rigidity and resistance to overturning moments, which is critical for maintaining precision under heavy combined loads.
- Optimized Load Capacity: With a 15° contact angle and a radial dynamic load rating of 80,550 lbf, this bearing is engineered to handle significant radial and axial loads simultaneously.
- High-Speed Capability: The lightweight, high-strength phenolic cage minimizes centrifugal forces, reduces friction, and allows for a high limiting speed of 11,000 rpm. The open design facilitates efficient lubrication for heat dissipation.
- Precision Performance: The P4A tolerance class ensures extremely tight dimensional control on the bore diameter (220 mm) and outside diameter (300 mm), resulting in superior running accuracy and reduced vibration.
- Premium Materials: Constructed from chrome steel for both rings and balls, the bearing offers high fatigue life and durability under demanding operating conditions.
71944 CD/P4ADBB Bearing Typical Application Areas
This high-precision, preloaded duplex bearing is specifically designed for applications where extreme accuracy, high rigidity, and speed are paramount. Key industries and machinery include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Gearboxes and high-torque drives.
- Industrial Pumps and Compressors requiring high shaft stability.
- Aerospace Test Rigs and precision positioning systems.
- Medical Imaging Equipment such as CT and MRI scanners.
