S7011 ACD/P4AQBCB
Sealed Super Precision Angular Contact Ball Bearings
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S7011 ACD/P4AQBCB Bearing Product Overview & Core Advantages
The S7011 ACD/P4AQBCB is a P4A super-precision quadruplex matched angular contact ball bearing in a back-to-back (QBC) arrangement. Engineered for the most demanding applications, this bearing set delivers exceptional high rigidity and stability under complex combined loads, including radial and multi-directional axial forces. Its compact design integrates four bearings into a single, pre-configured unit, providing superior running accuracy and reliability for high-performance machinery. The light preload (Class B) ensures optimal stiffness with minimal friction, making it ideal for high-speed operation.
S7011 ACD/P4AQBCB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| S7011 | Basic bearing designation, indicating a 55mm bore, 90mm OD, and 18mm single width. |
| ACD | 25° contact angle, a standard design optimized for supporting significant axial loads. |
| P4A | Indicates super-precision tolerance class (superior to ABEC 7), ensuring extremely tight dimensional and running accuracy for critical applications. |
| QBC | Signifies a Quadruplex Back-to-Back matched set. Four bearings are selectively matched and pre-loaded in a back-to-back configuration for maximum system rigidity and moment load capacity. |
S7011 ACD/P4AQBCB Bearing Structural Features & Performance Benefits
- Unmatched Rigidity and Stability: The quadruplex back-to-back (QBC) arrangement creates an extremely rigid bearing system that effectively resists moment loads and shaft deflection, which is critical for maintaining precision under heavy combined loads.
- Superior Load Capacity: With a dynamic load rating of 22,388 lbf and a static load rating of 28,125 lbf, this set is built to handle significant radial and bidirectional axial loads simultaneously, thanks to the 25° contact angle and multi-bearing support.
- Optimized High-Speed Performance: The phenolic resin cage offers low weight and excellent performance at high speeds, contributing to a high limiting speed of 34,000 rpm. The factory-applied grease lubrication is selected for stable operation within this range.
- Precision and Longevity: Manufactured to P4A tolerance class with chrome steel rings and balls, this bearing guarantees minimal runout and consistent performance. The sealed design protects the precision-ground components from contamination, preserving accuracy and extending service life.
S7011 ACD/P4AQBCB Bearing Typical Application Areas
This high-precision, high-rigidity bearing set is specifically designed for advanced machinery requiring ultimate accuracy and stiffness. Key applications include:
- High-Speed Machine Tool Spindles (e.g., for milling, grinding, and turning centers)
- Precision Robotics and Automation Arms
- Aerospace & Defense Actuation and Control Systems
- Medical Equipment such as high-speed dental handpieces and imaging scanners
- High-Frequency Spindles for PCB drilling and routing
