71907 ACD/P4ATBTA
71900 Series Super Precision Angular Contact Ball Bearings
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71907 ACD/P4ATBTA Bearing Product Overview & Core Advantages
The 71907 ACD/P4ATBTA is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and rigidity. This triplex matched set in a back-to-back (TBT) arrangement provides superior system stability and can accommodate combined radial and axial loads. Manufactured to the stringent P4A tolerance class, it delivers high running accuracy and is preloaded for extra-light preload (Class A), making it ideal for high-speed spindles and other precision machinery where minimal deflection and high rotational accuracy are critical.
71907 ACD/P4ATBTA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71907 | Basic bearing series and size designation (35mm bore, 55mm OD, 30mm width) |
| ACD | Angular Contact Design with a 25° contact angle for optimal axial load capacity |
| P4A | High precision tolerance class (superior to ABEC 7), ensuring minimal runout and vibration |
| TBT | Triplex Back-to-Back matched set arrangement, providing high moment rigidity and system stability |
| A | Specifies Extra Light Preload (Class A) for high-speed operation with minimal friction |
71907 ACD/P4ATBTA Bearing Structural Features & Performance Benefits
High Rigidity & System Stability: The triplex back-to-back (TBT) matched arrangement of three bearings creates a highly rigid bearing system capable of withstanding complex moment loads and shaft misalignments, ensuring precise shaft positioning.
Superior Load Capacity: With a 25° contact angle and a dynamic load rating of 4478 lbf, this bearing is engineered to handle significant combined radial and axial loads simultaneously.
Optimized High-Speed Performance: The phenolic resin cage offers low weight and excellent high-speed characteristics, contributing to a limiting speed of 56,000 rpm. The extra-light preload (Class A) minimizes heat generation at high rotational speeds.
Precision Engineering: Adherence to the P4A tolerance class guarantees tight dimensional control (bore/OD tolerance: -0.004mm to 0) and superior running accuracy, which is essential for applications requiring minimal vibration and high positional accuracy.
71907 ACD/P4ATBTA Bearing Typical Application Areas
The 71907 ACD/P4ATBTA is ideally suited for high-performance machinery where precision, speed, and rigidity are non-negotiable. Key application areas include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotic Drives: Articulated arms and high-accuracy gearboxes.
- High-Frequency Motors and Spindles: Applications demanding ultra-high rotational speeds.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and other critical navigation equipment.
