71930 CD/P4ATBTA
71900 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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Product Overview and Core Advantages
The 71930 CD/P4ATBTA is a precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. As part of a triplex back-to-back (TBT) matched set, this bearing configuration provides superior stiffness and stability, making it ideal for handling combined loads (radial and axial) simultaneously. Manufactured to P4A tolerance class, it ensures minimal runout and high positional accuracy, which is critical in high-speed, high-precision machinery.
71930 CD/P4ATBTA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71930 | Basic bearing series and size designation (150mm bore, 210mm OD). |
| C | 15° contact angle. |
| D | Optimized internal geometry for enhanced performance. |
| P4A | High precision tolerance class (superior to ABEC 7). |
| TBT | Triplex Back-to-Back matched arrangement of three bearings. |
| A | Extra light preload for minimal friction and optimal high-speed operation. |
Structural Features and Performance Benefits
- High Rigidity and Stability: The triplex back-to-back (TBT) arrangement creates a highly rigid bearing system that effectively resists moment loads and shaft deflection, ensuring precise shaft positioning under heavy combined loads.
- Superior Load Capacity: With a radial dynamic load rating of 55,575 lbf and a static load rating of 87,750 lbf, this bearing is engineered to withstand significant operational stresses.
- Optimized High-Speed Performance: The phenolic cage offers low weight and excellent operational characteristics at high speeds, contributing to a limiting speed of 11,000 rpm. The 15° contact angle provides a balanced capacity for axial and radial loads at high velocities.
- Precision Engineering: Manufactured to P4A tolerance standards with tight dimensional control on the bore, outside diameter, and width, this bearing guarantees smooth, quiet, and vibration-free operation.
- Material Quality: Constructed from chrome steel for both rings and balls, ensuring high durability, wear resistance, and a long service life.
71930 CD/P4ATBTA Bearing Typical Application Areas
The 71930 CD/P4ATBTA is specifically designed 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 Gearboxes and Industrial Pumps.
- Aerospace Actuation Systems and Robotic Rotary Joints.
- Medical Imaging Equipment such as CT scanners.
- High-Frequency Motors and Spindles.
