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KF Flange and ISO Flange in Vacuum Systems

Updated: Apr 30

KF originates from the German term “Klein Flansche”, which means “small flanges”. They are a type of flange system designed to be assembled and disassembled without needing specials tools. An O-ring and centering ring seal is sandwiched by two KF flanges, and is fastened with a quick release clamp without tools.


KF Flange

KF Flange
KF Flange

KF flanges are commonly used in industries such as laboratories and research facilities, semiconductor manufacturing, and analytical instruments such as mass spectrometers and electron microscopes.


KF Flange Vacuum System
KF Flange Vacuum System

ISO Flange

ISO Flanges work almost the same way. Instead of being fastened by clamp rings, the flanges, centering ring and o ring are secured by claw clamps. For sizes above 2", KF Flanges are no longer available, and we rely on ISO Flanges instead.


ISO Flange
ISO Flange

KF flanges and ISO flanges are ubiquitous today due to its ease of use, the tool-free assembly is user friendly and saves time during the setup and maintenance of vacuum systems. The availability of various sizes allows for flexibility in system design. They are also known to be reliable in creating and maintaining vacuum conditions.

KF Flange in Labs
KF Flange in Labs

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