71956 CD/P4ATBTA
71900 Series Super Precision Angular Contact Ball Bearings
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71956 CD/P4ATBTA Bearing Product Overview & Core Advantages
The 71956 CD/P4ATBTA is a precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. This bearing is supplied as a triplex back-to-back (TBT) matched set, consisting of three individual bearings pre-configured to deliver superior system stability and load-sharing capabilities. Its extra light preload (Class A) ensures minimal friction and optimal performance in high-speed, high-precision environments. Engineered to withstand combined loads, it is an ideal solution for machine tool spindles and other critical equipment.
71956 CD/P4ATBTA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71956 | Basic bearing series and size designation (280mm bore, 380mm OD). |
| CD | Indicates a 15° contact angle, optimized for high-speed operation and moderate axial loads. |
| P4A | Specifies a high-precision tolerance class (superior to ABEC 7/ISO P4), ensuring minimal runout and vibration. |
| TBT | Denotes the bearing is part of a Triplex Back-to-Back matched set of three bearings, providing maximum system rigidity. |
| A | Signifies an Extra Light Preload for reduced friction and heat generation at high speeds. |
71956 CD/P4ATBTA Bearing Structural Features & Performance Benefits
High Rigidity & System Stability: The triplex back-to-back (TBT) arrangement creates a highly rigid bearing system capable of resisting complex moment loads and shaft deflection, which is critical for maintaining machining accuracy.
Superior Load Capacity: With a dynamic load rating of 140,400 lbf and a static load rating of 308,250 lbf, this bearing set is engineered to handle significant combined (radial and axial) loads.
Optimized High-Speed Performance: The combination of a 15° contact angle, light preload, and a phenolic resin cage allows for a high limiting speed of 7,500 rpm. The phenolic cage offers excellent strength-to-weight ratio and operates smoothly with minimal friction.
Precision & Accuracy: Manufactured to P4A tolerance class with tight dimensional control on bore, outside diameter, and width, this bearing ensures precise shaft positioning and minimal runout.
71956 CD/P4ATBTA Bearing Typical Application Areas
The 71956 CD/P4ATBTA is ideally suited for high-performance applications where precision, speed, and rigidity are paramount. Key industries and machinery include:
- Machine Tool Spindles: For CNC machining centers, grinding spindles, and milling machines.
- High-Speed Precision Drives: In robotics, high-frequency motors, and precision gearboxes.
- Aerospace & Defense Systems: Gyroscopes, radar equipment, and other critical rotational mechanisms.
