71930 CD/P4ADBA
71900 Series Super Precision Angular Contact Ball Bearings
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71930 CD/P4ADBA Bearing Product Overview & Core Advantages
The 71930 CD/P4ADBA is a precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. This metric bearing features a duplex back-to-back (DB) arrangement and an extra light preload (Class A), making it ideally suited for high-speed spindles and other precision machinery. Its primary advantage lies in its ability to handle combined loads—simultaneously supporting substantial radial and axial forces—while maintaining high running accuracy and system stability. The open design allows for optimized lubrication management in sophisticated systems.
71930 CD/P4ADBA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71930 | Basic bearing designation indicating size series and 150 mm bore diameter. |
| C | Designates a 15° contact angle, optimized for high-speed operation and moderate axial load capacity. |
| D | Indicates the bearing is part of a duplex pair. |
| P4A | Specifies a high precision tolerance class (superior to ABEC 7/ISO P4), ensuring minimal runout and vibration. |
| DB | Specifies the Back-to-Back duplex arrangement. This configuration provides high moment rigidity and excellent stability under complex loading conditions. |
| A | Denotes the extra light preload class, which minimizes friction and heat generation for maximum high-speed performance. |
71930 CD/P4ADBA Bearing Structural Features & Performance Benefits
High Rigidity & Stability: The duplex back-to-back (DB) arrangement significantly increases system rigidity by creating a wide effective spread between the load centers. This configuration is exceptionally resistant to moment loads, making it ideal for applications like machine tool spindles.
Superior Load Capacity: With a dynamic load rating of 41,850 lbf and a static load rating of 58,500 lbf, this bearing is engineered to handle demanding combined radial and axial loads.
Optimized High-Speed Performance: The combination of a 15° contact angle, light preload, and a phenolic cage contributes to low friction, reduced centrifugal forces, and a high limiting speed of 11,000 rpm. The phenolic cage offers excellent strength-to-weight ratio and operates smoothly at high velocities.
Precision Engineering: Manufactured to P4A tolerance class with tight dimensional control on the bore, outside diameter, and width, this bearing ensures high running accuracy and consistent performance in precision assemblies.
71930 CD/P4ADBA Bearing Typical Application Areas
The 71930 CD/P4ADBA is specified for high-performance applications where precision, speed, and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Rotary Systems: Industrial robots, CNC indexing heads, and rotary tables.
- High-Frequency Motors & Spindles: Where low vibration and high rotational accuracy are critical.
- Aerospace & Defense Systems: Gyroscopes, radar platforms, and other precision instrumentation.
