7018 ACD/P4AQBCB
7000 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
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Materials
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7018 ACD/P4AQBCB Bearing Product Overview & Core Advantages
The 7018 ACD/P4AQBCB is a precision quadruplex angular contact ball bearing designed for the most demanding applications requiring exceptional rigidity and accuracy. This matched set of four bearings, arranged in a back-to-back (QBC) configuration, is engineered to handle complex combined loads, including significant radial and axial forces in both directions. With its P4A super-precision tolerance and light preload (Class B), it delivers superior rotational accuracy, high running stability, and minimal heat generation, making it ideal for high-precision, high-rigidity spindles.
7018 ACD/P4AQBCB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7018 | Standard bearing series designation, indicating the bearing dimensions (90mm bore, 140mm OD). |
| ACD | Angular Contact Design with a 25° contact angle for optimal axial load capacity. |
| P4A | Indicates a super-precision tolerance class, exceeding normal P4 standards for enhanced running accuracy. |
| QBC | Specifies a Quadruplex Back-to-Back matched arrangement, providing maximum rigidity and moment load capacity. |
7018 ACD/P4AQBCB Bearing Structural Features & Performance Benefits
Unmatched Rigidity and Stability: The quadruplex back-to-back (QBC) arrangement creates a highly rigid bearing system that effectively resists moment loads and shaft deflection, ensuring exceptional positional accuracy of the spindle.
Superior Load Capacity: The 25° contact angle and the synergistic effect of four bearings enable this set to carry heavy combined radial and axial loads simultaneously from both directions.
High-Speed Capability: The lightweight phenolic resin cage reduces centrifugal forces, while the precision-ground components and optimized internal geometry contribute to a high limiting speed of 16,000 rpm, qualifying it as a true high-speed bearing.
Pre-optimized for Performance: The set is supplied pre-lubricated and with a light preload (Class B) applied, ensuring immediate, out-of-the-box performance with consistent running torque and minimal thermal growth.
7018 ACD/P4AQBCB Bearing Typical Application Areas
This bearing is specifically engineered for high-end machinery where ultimate precision and stiffness are non-negotiable. Key applications include:
- High-Speed Machine Tool Spindles (e.g., for milling, grinding, and turning centers)
- Precision Grinding Spindles
- High-performance Industrial Pumps and Compressors
- Advanced Aerospace and Defense Positioning Systems
