7018 CD/P4ADBB
7000 Series Super Precision Angular Contact Ball Bearings
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7018 CD/P4ADBB Bearing Product Overview & Core Advantages
The 7018 CD/P4ADBB is a precision duplex angular contact ball bearing designed for applications requiring exceptional rotational accuracy and rigidity. This matched back-to-back (DB) arrangement is preloaded to Light / Class B standards, providing superior system stability and minimizing axial and radial runout. Its primary advantage lies in its ability to handle combined loads (radial and axial) simultaneously with high precision, making it an ideal choice for high-speed and high-rigidity spindles and machinery.
7018 CD/P4ADBB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7018 | Basic bearing series, defining the bore diameter (90 mm), outside diameter (140 mm), and width (48 mm). |
| C | Designates a 15° contact angle, optimized for high-speed performance and axial load capacity. |
| D | Indicates the bearing is part of a duplex (matched) set. |
| P4A | Specifies a high-precision tolerance class exceeding ABEC 7 (ISO Class 4) standards, ensuring minimal dimensional variation and superior running accuracy. |
| DB | Defines the Back-to-Back arrangement of the duplex pair. This configuration provides high moment rigidity and excellent stability under complex loads. |
| B | Specifies the Light preload level (Class B), which reduces deflection and improves positional accuracy without generating excessive heat. |
7018 CD/P4ADBB Bearing Structural Features & Performance Benefits
High Rigidity & System Stability: The duplex back-to-back (DB) arrangement creates a wide, rigid support system that effectively resists moment loads and shaft deflection, which is critical for maintaining precision in machining operations.
Superior Load Capacity: The 15° contact angle and robust construction, featuring a phenolic cage and chrome steel components, enable high dynamic and static load ratings (28,575 lbf and 34,425 lbf respectively), suitable for demanding combined load conditions.
Optimized High-Speed Performance: The lightweight phenolic cage reduces centrifugal forces, while the open design and pre-lubrication facilitate efficient cooling and lubrication at the limiting speed of 15,000 rpm.
Precision Engineering: Manufactured to P4A tolerance class with tight dimensional controls on the bore, outside diameter, and width, this bearing guarantees consistent, high-accuracy performance in the most demanding applications.
7018 CD/P4ADBB Bearing Typical Application Areas
- Machine Tool Spindles: High-speed milling, grinding, and turning centers requiring extreme rigidity and running accuracy.
- Precision Gearboxes: Applications where low noise, high speed, and precise shaft positioning are critical.
- High-Frequency Motors and Spindles: Used in PCB drilling, semiconductor manufacturing, and other high-RPM machinery.
- Industrial Pumps and Compressors: For shafts subjected to significant radial and axial loads.
- Robotic Arms and Precision Rotary Tables: Where high moment load capacity and positional repeatability are essential.
