7018 ACDGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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7018 ACDGA/HCP4A Bearing Product Overview & Core Advantages
The 7018 ACDGA/HCP4A is a high-precision angular contact ball bearing engineered for demanding applications requiring exceptional accuracy and performance. This single bearing features a 25° contact angle and an Extra light (Class A) preload, making it ideally suited for applications where high rigidity, minimal deflection, and precise rotational accuracy are paramount. Its open seal design allows for high-speed operation, while its P4A tolerance class ensures superior dimensional and running accuracy. This bearing is also part of a Universal Matchable (SU) set, enabling it to be precision-matched with other bearings in the set to achieve optimal stiffness and load distribution.
7018 ACDGA/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| 7018 | Basic bearing series and size code (90mm bore, 140mm OD, 24mm width). |
| AC | Angular Contact design. |
| DGA | Specific internal design and preload specification (Extra light / Class A). |
| HC | Hybrid Ceramic, indicating Ceramic balls and a Phenolic cage. |
| P4A | Tolerance class P4A, denoting very high precision for dimensional and running accuracy. |
7018 ACDGA/HCP4A Bearing Structural Features & Performance Benefits
The 7018 ACDGA/HCP4A's performance is derived from its advanced construction. The 25° contact angle is optimized for supporting combined loads, particularly substantial axial loads in one direction. The Extra light preload eliminates internal clearance, providing high system rigidity and reducing noise and vibration during operation. The hybrid ceramic design, featuring ceramic balls and a phenolic cage, significantly reduces weight and inertia, enabling higher limiting speeds and offering superior performance in high-temperature or electrically sensitive environments. The open design facilitates efficient lubrication management, which is critical for achieving the specified high-speed performance of 15,000 rpm. Manufactured to P4A tolerance standards, this bearing guarantees exceptional running accuracy and consistent performance.
7018 ACDGA/HCP4A Bearing Typical Application Areas
This precision bearing is designed for high-performance applications, including:
- Machine Tool Spindles: For high-speed milling, grinding, and turning centers requiring utmost precision and rigidity.
- High-Frequency Motors and Spindles: Where the benefits of hybrid ceramic components are fully utilized.
- Precision Instrumentation: In applications demanding minimal rotational error and high stability.
- Aerospace and Defense Systems: For critical components requiring reliability and performance under demanding conditions.
