7218 ACD/P4AQBCC
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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Main Dimensions
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7218 ACD/P4AQBCC Bearing Product Overview & Core Advantages
The 7218 ACD/P4AQBCC is a precision quadruplex angular contact ball bearing designed for demanding applications requiring exceptional rigidity and load capacity. This P4A tolerance class bearing features a back-to-back quadruplex (QBC) arrangement, providing superior stability and the ability to handle complex combined loads including radial and significant axial forces in both directions. With its moderate preload (Class C) and optimized contact angle of 25°, it delivers high running accuracy and is engineered for high-stiffness applications where precision is critical.
7218 ACD/P4AQBCC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7218 | Standard bore diameter (90 mm), outside diameter (160 mm), and width (120 mm) dimensions |
| ACD | Angular Contact Design with a 25° contact angle |
| P4A | High precision tolerance class exceeding ABEC 7 standards |
| QBCC | Quadruplex Back-to-Back arrangement with moderate preload (Class C) |
7218 ACD/P4AQBCC Bearing Structural Features & Performance Benefits
Exceptional Rigidity & Load Capacity: The quadruplex back-to-back configuration creates an extremely rigid bearing system capable of withstanding heavy combined radial and axial loads. This arrangement provides superior moment load resistance and operational stability.
Precision Engineering: Manufactured to P4A tolerance class with tight dimensional control (bore tolerance: -0.004mm to 0), ensuring high running accuracy and minimal vibration for precision applications.
Optimized High-Speed Performance: The phenolic cage material and precision-ground chrome steel balls enable reliable operation at high speeds, with a limiting speed of 17,000 rpm.
Enhanced Durability: Constructed from high-quality chrome steel throughout, providing excellent wear resistance and long service life under demanding conditions.
7218 ACD/P4AQBCC Bearing Typical Application Areas
This bearing is specifically designed for high-precision, high-rigidity applications including:
- Machine Tool Spindles - Providing precise rotational accuracy and stiffness for milling, grinding, and turning operations
- Precision Gearboxes - Handling complex load conditions in industrial transmission systems
- High-Speed Positioning Systems - Ensuring accuracy and stability in automated manufacturing equipment
- Robotic Arm Joints - Delivering the required rigidity and load capacity for precise movement control
- Aerospace Actuation Systems - Meeting the demanding precision and reliability requirements
