71948 ACD/P4ATBTB
71900 Series Super Precision Angular Contact Ball Bearings
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71948 ACD/P4ATBTB Bearing Product Overview & Core Advantages
The 71948 ACD/P4ATBTB is a precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. This triplex back-to-back (TBT) matched set is preloaded to Light / Class B specifications, delivering superior system stability and resistance to complex combined loads. Manufactured to an ultra-precision P4A tolerance class, it is the ideal solution for high-speed spindles and other precision machinery where minimal runout and high dynamic performance are critical.
71948 ACD/P4ATBTB Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning | Significance |
|---|---|---|
| ACD | Angular Contact, 25° Contact Angle | Optimized for carrying significant axial loads in one direction and radial loads simultaneously. |
| P4A | Ultra-Precision Tolerance Class | Exceeds standard ABEC-7 precision, ensuring extremely tight dimensional and running accuracy for high-performance applications. |
| TBT | Triplex Back-to-Back Matched Arrangement | A set of three bearings mounted back-to-back, providing maximum rigidity and moment load capacity. |
71948 ACD/P4ATBTB Bearing Structural Features & Performance Benefits
- High Rigidity & Moment Stiffness: The triplex back-to-back (TBT) configuration creates a highly rigid bearing system that effectively resists moment loads and shaft deflection, crucial for maintaining precision under heavy cutting forces or operational stresses.
- Superior Load Capacity: With a 25° contact angle and a robust design featuring 31 balls, this bearing is engineered to handle high combined radial and axial loads. The dynamic load rating of 103,950 lbf and static load rating of 205,875 lbf ensure long-term reliability.
- Optimized High-Speed Performance: The lightweight phenolic cage minimizes centrifugal forces and friction, contributing to a high limiting speed of 7,500 rpm. This makes it suitable for high-speed spindle applications.
- Precision & Stability: The P4A tolerance class and tight dimensional tolerances on the bore, outside diameter, and width guarantee consistent, high-precision performance with minimal vibration and noise.
71948 ACD/P4ATBTB Bearing Typical Application Areas
The 71948 ACD/P4ATBTB is specified for high-end machinery where precision, speed, and rigidity are non-negotiable. Key applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Gearboxes: For robotics, aerospace, and other high-tech industries.
- High-Frequency Motors and Spindles: Where minimal runout and thermal stability are required.
