S7018 CDGB/P4A
Sealed Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
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S7018 CDGB/P4A Bearing Product Overview & Core Advantages
The S7018 CDGB/P4A is a super-precision double row angular contact ball bearing engineered for the most demanding applications. Its core advantage lies in its ability to simultaneously support high combined loads—significant radial loads and bidirectional axial loads—within an exceptionally compact design. Manufactured to the stringent P4A tolerance class, this bearing delivers superior running accuracy, high rigidity, and exceptional operational reliability, making it an ideal choice for high-speed spindles and other precision machinery where uncompromising performance is critical.
S7018 CDGB/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| S7018 | Denotes the bearing series and size. A double row, super-precision angular contact ball bearing with a 90mm bore. |
| C | Specifies a 15° contact angle, optimized for high-speed operation and high axial load capacity. |
| DG | Indicates a Universal Matchable (SU) bearing. Two bearings are supplied as a matched set for preloaded arrangements, ensuring optimal stiffness and performance. |
| B | Signifies a Light preload (Class B), which minimizes deflection and controls axial and radial play for enhanced precision. |
| /P4A | The tolerance class, representing the highest level of dimensional and running accuracy (superior to ABEC 7/ISO P4). |
S7018 CDGB/P4A Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The double row design provides superior radial and axial rigidity compared to single row bearings, effectively handling combined loads from all directions. This robust construction ensures minimal deflection under load, critical for maintaining precision.
High-Speed Performance: The phenolic resin cage is lightweight and strong, contributing to lower centrifugal forces and reduced friction, which is essential for achieving the high limiting speed of 15,000 rpm. The optimized internal geometry and 15° contact angle further enhance high-speed capability.
Precision & Longevity: Manufactured from high-grade chrome steel for both rings and balls, and hardened for durability. The sealed construction retains the factory-fill grease lubrication, protecting against contamination and providing reliable, long-term performance within the specified temperature range.
S7018 CDGB/P4A Bearing Typical Application Areas
The S7018 CDGB/P4A is specifically designed for high-performance machinery requiring extreme precision, rigidity, and speed. Its primary applications include:
- Machine Tool Spindles (High-speed milling, grinding, and turning centers)
- Precision Grinding Spindles
- High-Frequency Motors
- Industrial Pumps and Compressors
- Aerospace and Defense Instrumentation
