71920 CDGB/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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71920 CDGB/P4A Bearing Product Overview & Core Advantages
The 71920 CDGB/P4A is a single-row angular contact ball bearing manufactured to ultra-precision P4A tolerance class. Engineered for applications demanding exceptional rotational accuracy and high-speed performance, this bearing is designed to primarily accommodate combined loads (simultaneous radial and axial loads) in one direction. Its light preload (Class B) ensures minimal deflection under operational stresses, making it ideal for high-precision, high-reliability machinery where rigidity and precision are paramount. The bearing comes pre-lubricated and is part of a universally matchable (SU) set, allowing for flexible mounting configurations in complex spindle arrangements.
71920 CDGB/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71920 | Basic bearing series and size designation (100mm bore, 140mm OD, 20mm width). |
| C | Specifies a 15° contact angle, optimized for high-speed operation and axial load capacity. |
| DGB | Indicates a light preload (Class B) and that the bearing is universally matchable (SU), allowing for any combination in a set. |
| P4A | Denotes an ultra-precision tolerance class with enhanced running accuracy and dimensional stability. |
71920 CDGB/P4A Bearing Structural Features & Performance Benefits
- High Precision & Rigidity: Manufactured to P4A tolerance standards with extremely tight dimensional tolerances on the bore, outside diameter, and width. The light preload eliminates internal clearance, resulting in superior shaft positioning accuracy and high rigidity, which is critical for minimizing deflection under load.
- Optimized Load Capacity: The 15° contact angle and high-quality chrome steel construction provide an excellent balance, enabling the bearing to handle significant combined loads. It offers a dynamic load rating of 13,612 lbf and a static load rating of 14,738 lbf.
- Superior High-Speed Performance: The phenolic resin cage is lightweight and strong, reducing centrifugal forces and friction. This, combined with the optimized internal geometry and pre-lubrication, allows for a high limiting speed of 16,000 rpm.
- Universal Matchability: As an SU-type bearing, it can be mounted in any combination (back-to-back, face-to-face, or tandem) with other bearings from the same set to create a pre-loaded arrangement, offering immense design flexibility for spindle builders.
71920 CDGB/P4A Bearing Typical Application Areas
The 71920 CDGB/P4A is a critical component in high-performance machinery where precision and speed are non-negotiable. Its primary applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling machines, high-frequency routers.
- Industrial Pumps & Compressors: For applications requiring high rotational accuracy.
- Robotics: High-precision joints and rotary actuators.
