SKF 618/4 High-Precision Thin Section Ball Bearing
The SKF 618/4 is an ultra-compact thin section deep groove ball bearing that engineers primarily specify for high-precision miniature applications. Firstly, this bearing offers an incredibly small footprint without sacrificing the rotational accuracy or high-speed capabilities expected from the SKF brand. It belongs to the single-row deep groove category, which provides versatile performance for lightweight and precision-focused industrial components.
Technical Dimensions and Exceptional Speed
In addition to its space-saving geometry, the 618/4 features very specific and delicate dimensions. It has a bore diameter of 4 mm, an outside diameter of 9 mm, and a width of only 2.5 mm. Regarding its performance capabilities, the bearing supports a basic dynamic load rating of 0.423 kN and a basic static load rating of 0.116 kN. Furthermore, it reaches an extraordinary reference speed of 140,000 r/min and a limiting speed of 85,000 r/min. Therefore, this model serves as an ideal choice for high-speed machinery where weight reduction and size remain critical factors.
Material Properties and Open Configuration
Specifically, the 618/4 features an open design without seals or shields. This allows for seamless integration into oil-lubricated systems or environments where the user provides specific lubrication. Because it utilizes high-quality bearing steel, the unit maintains excellent structural stability even at maximum rotational speeds. Moreover, the cylindrical bore type and standard radial internal clearance (CN) ensure a stable and predictable fit for precision shafts.
Additionally, this bearing does not include filling slots or a locating feature on the outer ring. This streamlined “Thin Section” geometry reduces the total mass of the component to a negligible 0.0005 kg. As a result, the design significantly lowers rotational inertia. This allows your equipment to accelerate and decelerate much more efficiently than with standard-sized bearings.
Common Industrial Applications
Because of its unique size and high-speed design, the SKF 618/4 is essential in specialized sectors. For example, medical instruments, miniature dental tools, robotics, and high-end optical equipment frequently rely on this specific thin-section model. Finally, the open configuration supports smooth, low-friction movement in clean, controlled environments. This makes it a top-tier selection for engineers who prioritize extreme precision and space efficiency.
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