71917 ACD/P4AQBCC
71900 Series Super Precision Angular Contact Ball Bearings
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71917 ACD/P4AQBCC Bearing Product Overview & Core Advantages
The 71917 ACD/P4AQBCC is a high-precision quadruplex angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. This metric bearing features a back-to-back (QBC) matched arrangement of four bearings, enabling it to withstand combined loads—significant radial and axial loads in both directions simultaneously. Its P4A tolerance class ensures ultra-precise running accuracy, while the moderate preload (Class C) provides optimal stiffness for high-speed operation, making it an ideal solution for high-performance spindles and precision machinery.
71917 ACD/P4AQBCC Bearing Model Code Explained, Specifications & Naming Convention
- 71917: Basic designation indicating a 85 mm bore, 120 mm OD angular contact ball bearing.
- ACD: Signifies Angular Contact design with a 25° contact angle.
- P4A: Denotes an ultra-high precision tolerance class, exceeding ABEC 7/ISO P4 standards.
- QBCC: Indicates the bearing is part of a Quadruplex Back-to-Back (QBC) matched set with Moderate (Class C) preload.
71917 ACD/P4AQBCC Bearing Structural Features & Performance Benefits
Unmatched Rigidity and Load Capacity: The quadruplex back-to-back (QBC) arrangement creates an extremely rigid bearing system, effectively resisting complex moment loads. This configuration, combined with the 25° contact angle, provides a high radial dynamic load rating of 25,650 lbf and a static load rating of 41,175 lbf.
High-Speed Performance: The lightweight phenolic resin cage minimizes centrifugal forces, contributing to a high limiting speed of 28,000 rpm. The moderate preload is optimized to control deflection without generating excessive heat at high rotational speeds.
Precision Engineering: Manufactured to P4A tolerance class with tight dimensional control on the bore, outside diameter, and width, this bearing ensures minimal runout and vibration for superior operational accuracy.
71917 ACD/P4AQBCC Bearing Typical Application Areas
This bearing is engineered for the most demanding high-precision and high-speed machinery, including:
- Machine Tool Spindles for CNC milling, grinding, and turning centers
- High-Frequency Machining Spindles
- Precision Gearboxes
- Industrial Pumps and Compressors requiring high axial and radial stiffness
