7018 CD/P4ATBTA
7000 Series Super Precision Angular Contact Ball Bearings
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7018 CD/P4ATBTA Bearing Product Overview & Core Advantages
The 7018 CD/P4ATBTA is a precision angular contact ball bearing configured as a triplex back-to-back (TBT) matched set. Engineered for applications demanding exceptional rotational accuracy and rigidity, this bearing arrangement excels at handling combined loads (radial and axial) from multiple directions simultaneously. Manufactured to a P4A tolerance class, it offers superior running accuracy and dimensional stability. The extra light preload (Class A) ensures minimal deflection under load, making it ideal for high-precision, high-stiffness applications such as machine tool spindles.
7018 CD/P4ATBTA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7018 | Basic bearing series and size designation (90mm bore, 140mm OD). |
| CD | Indicates a 15° contact angle, optimized for high-speed operation and axial load capacity. |
| P4A | Specifies the high-precision tolerance class, exceeding standard ABEC 7/ISO P4 levels for enhanced running accuracy. |
| TBT | Denotes the bearing is supplied as a Triplex Back-to-Back matched set of three bearings, providing maximum system rigidity. |
| A | Specifies the Extra Light preload (Class A) for minimal friction and optimal high-speed performance. |
7018 CD/P4ATBTA Bearing Structural Features & Performance Benefits
- Exceptional Rigidity & Load Capacity: The triplex back-to-back arrangement creates a highly rigid bearing system capable of supporting heavy combined radial and axial loads from both directions, significantly reducing shaft deflection.
- High-Speed Capability: The 15° contact angle (CD) and light preload are optimized for high-speed applications. The phenolic resin cage ensures stable operation at the limiting speed of 15,000 rpm.
- Precision Performance: Manufactured to P4A super-precision tolerances with tight dimensional control on bore, outside diameter, and width, guaranteeing smooth, quiet, and vibration-free operation.
- Optimized Material Selection: Components are made from high-grade chrome steel for durability and long service life. The phenolic cage is lightweight and performs well at high speeds.
7018 CD/P4ATBTA Bearing Typical Application Areas
The 7018 CD/P4ATBTA is specifically designed for high-performance machinery where precision, speed, and rigidity are paramount. Key applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: Applications in PCB drilling, semiconductor manufacturing, and other high-accuracy processes.
- High-Frequency Motors: Where minimal runout and high rotational accuracy are required.
- Industrial Pumps & Compressors: For shafts requiring robust support against complex loading.
