S7018 ACD/P4AQBCC
Sealed Super Precision Angular Contact Ball Bearings
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S7018 ACD/P4AQBCC Bearing Product Overview & Core Advantages
The S7018 ACD/P4AQBCC is a precision angular contact ball bearing engineered for the most demanding applications. Its defining feature is the Quadruplex Back-to-Back (QBC) matched arrangement, providing exceptional system rigidity and stability. This bearing is designed to handle combined loads (radial and axial) simultaneously with high accuracy. Manufactured to a P4A tolerance class and preloaded for moderate stiffness, it is the ideal solution for high-speed spindles and machinery requiring uncompromising precision and reliability.
S7018 ACD/P4AQBCC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| S7018 | Basic bearing series and size designation (90mm bore, 140mm OD). |
| ACD | Angular Contact Design with a 25° contact angle for optimal axial load capacity. |
| P4A | Indicates a high-precision tolerance class, superior to ABEC 7, ensuring minimal runout and vibration. |
| QBC | Specifies a Quadruplex Back-to-Back matched set of 4 bearings, pre-configured for maximum moment rigidity. |
| C | Denotes a Moderate preload (Class C), balancing rigidity and operational temperature. |
S7018 ACD/P4AQBCC Bearing Structural Features & Performance Benefits
Unmatched Rigidity: The Quadruplex Back-to-Back (QBC) arrangement creates an extremely rigid bearing system, capable of resisting complex moment loads and shaft deflection, which is critical for maintaining machining accuracy.
High Load Capacity: With a 25° contact angle and robust construction, this bearing excels at supporting significant combined radial and axial loads. The dynamic and static load ratings of 44,775 lbf and 65,250 lbf respectively, ensure long-term durability under heavy-duty operation.
Optimized High-Speed Performance: The phenolic cage is lightweight and possesses excellent tribological properties, contributing to lower friction and higher limiting speeds. The factory-applied grease lubrication is formulated for stable performance within the specified temperature range.
Sealed & Ready-to-Use: As a sealed bearing, it is protected from contamination and comes pre-lubricated, offering a maintenance-free, long-service-life solution right out of the box.
S7018 ACD/P4AQBCC Bearing Typical Application Areas
The S7018 ACD/P4AQBCC is specifically designed for high-performance machinery where precision, speed, and rigidity are non-negotiable. Key application areas include:
- High-Speed Machine Tool Spindles (e.g., CNC milling, grinding, and jig boring machines)
- Precision Robotic Drives and Rotary Actuators
- High-Frequency Machining Centers
- Advanced Medical Equipment and Dental Drill Handpieces
- Aerospace Test Rigs and Instrumentation
