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Binhai Industrial Park, Longwan District,
Wenzhou, China
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 rowan@newtekindustry.com
 Binhai Industrial Park, Longwan District, Wenzhou, China
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ISO-KF Stainless Steel 304 Conical Reducers

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Stainless steel conical reducers have different sized ISO-KF flange sizes on each end. A high conductance conical profile is used between the two flange sizes.

  • High conductance conical profile

  • 304 Stainless Steel construction

  • NW25-NW50 to NW16-NW40


ISO-KF reducer commonly used to build foreline vacuum plumbing and process systems. They are often called quick flange fittings because they are quick to assemble. A circumferential clamp and centering ring form the vacuum seal between the connecting flanges (please see top right figure - click to enlarge). The centering ring contains a rubber elastomer o-ring. The standard sizes for quick flange fittings are KF-10, KF-16, KF-25, KF-40, and KF-50 with flange sizes NW-10, NW-16, NW-25, NW-40, and NW-50, respectively. They are made of corrosive resistant stainless steel.


The ISO has defined the interface dimensions, allowing the interchanging of components that conform to the ISO-KF standard’s dimensions. The ISO-KF system is a modular, building block method of creating a vacuum piping system. There are several advantages in the use of ISO components. Since component dimensions are standardized of elbows, tees, crosses or valves. 

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