S71917 ACD/P4AQBCC
Sealed Super Precision Angular Contact Ball Bearings
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S71917 ACD/P4AQBCC Bearing Product Overview & Core Advantages
The S71917 ACD/P4AQBCC is a precision quadruplex back-to-back angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. This P4A tolerance class bearing is engineered to handle combined radial and axial loads simultaneously. Its matched set of four bearings provides superior stiffness and rotational precision, making it ideal for high-speed, high-rigidity spindles and other precision machinery where uncompromising performance is critical.
S71917 ACD/P4AQBCC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| S71917 | Basic bearing designation, indicating a 85 mm bore, 120 mm OD angular contact ball bearing. |
| ACD | Contact angle of 25°, optimized for high axial load capacity. |
| P4A | Indicates a high precision tolerance class for superior running accuracy. |
| QBCC | Specifies a Quadruplex Back-to-Back (QBC) matched arrangement with a Moderate (Class C) preload for maximum system rigidity. |
S71917 ACD/P4AQBCC Bearing Structural Features & Performance Benefits
Exceptional Rigidity: The quadruplex back-to-back configuration creates an extremely rigid bearing system, capable of resisting complex moment loads and maintaining precise shaft positioning under heavy combined loads.
High Load Capacity: With a 25° contact angle and a robust design, this bearing delivers high radial and axial load ratings (25,650 lbf dynamic / 41,175 lbf static), making it suitable for applications with significant thrust and radial forces.
Optimized High-Speed Performance: The lightweight phenolic cage minimizes centrifugal forces, contributing to a high limiting speed of 28,000 rpm. The grease lubrication and precision construction ensure stable operation at high rotational speeds.
Sealed & Pre-lubricated Design: As a sealed bearing pre-filled with grease, it is protected from contamination and is ready for immediate installation, offering long-term, maintenance-free operation within its specified temperature range of -30°C to 110°C.
S71917 ACD/P4AQBCC Bearing Typical Application Areas
The S71917 ACD/P4AQBCC is ideally suited for high-performance applications including:
- Machine Tool Spindles for milling, grinding, and turning centers
- High-Speed Precision Spindles in PCB drilling and routing equipment
- Industrial Pumps and Compressors requiring high rigidity and accuracy
- Precision Robotics and automated handling systems
