71948 CDGB/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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71948 CDGB/P4A Bearing Product Overview & Core Advantages
The 71948 CDGB/P4A is a super-precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and high-speed capability. As a single bearing with a Universal Matchable (SU) designation, it can be precisely paired with a second, identical bearing to form a preloaded duplex set, delivering superior system rigidity. Its Light preload (Class B) minimizes deflection under operational stresses, making it ideal for high-precision spindles. Manufactured to the stringent P4A tolerance class, this bearing ensures minimal runout and consistent performance, solidifying its role in high-rigidity and high-speed environments.
71948 CDGB/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71948 | Basic bearing series and size designation (240mm bore, 320mm OD). |
| C | Specifies a 15° contact angle, optimized for high-speed operation and moderate axial load capacity. |
| D | Indicates a phenolic (polyamide) cage, which reduces friction, allows for higher speeds, and is suitable for a wide temperature range. |
| GB | Signifies a Light preload (Class B), which enhances system stiffness and positioning accuracy without generating excessive heat. |
| P4A | Denotes an ultra-precision tolerance class with even tighter controls on dimensional and running accuracy than standard P4, ensuring superior performance in the most demanding applications. |
71948 CDGB/P4A Bearing Structural Features & Performance Benefits
High Rigidity and Precision: The bearing's angular contact design and Light preload work in concert to provide exceptional resistance to deflection under combined loads (radial and axial), which is critical for maintaining accuracy in machining and positioning systems.
Optimized High-Speed Performance: The lightweight phenolic cage minimizes centrifugal forces and ensures stable guidance of the balls at the limiting speed of 7,500 rpm. The 15° contact angle further contributes to lower heat generation at high rotational velocities.
Superior Load Capacity: With a dynamic load rating of 51,525 lbf and a static load rating of 73,125 lbf, this bearing is engineered to handle significant operational stresses, ensuring long-term reliability.
Universal Matching Capability (SU): This feature allows for the flexible arrangement of two identical bearings in back-to-back (DB), face-to-face (DF), or tandem (DT) configurations. This versatility enables engineers to tailor the bearing set to the specific stiffness and moment load requirements of the application.
71948 CDGB/P4A Bearing Typical Application Areas
The 71948 CDGB/P4A is the bearing of choice for high-performance machinery where precision, speed, and rigidity are non-negotiable. Key application areas include:
- Machine Tool Spindles: For CNC machining centers, grinding spindles, and milling heads.
- High-Speed Motors and Spindles: Used in electric motors, precision spindles, and other high-RPM drives.
- Precision Rotary Tables: In indexing and positioning systems requiring minimal runout.
- Aerospace and Defense Systems: For gyroscopes, radar platforms, and other critical guidance equipment.
- Medical Equipment: In high-speed dental handpieces and imaging device rotors.
