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KF Flange and ISO Flange in Vacuum Systems

Updated: Oct 23

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


What makes a KF Union:

KF Clamp

To fasten the union by tightening the wingnut.


KF Flange

To be welded to tubes.


KF O Ring

Acts as a seal to prevent leakages.


KF Centering Ring

Acts as a frame for the O Ring.


KF Blank Flange

Acts as a cover to to block flow.


KF Flange Vacuum System

ISO Flange

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.


What makes an ISO Union:

ISO Claw Clamp

To fasten the union by tightening the bolt.


ISO Flange

To be welded to tubes.


ISO O Ring

Acts as a seal to prevent leakages.


ISO Centering Ring

Acts as a frame for the O Ring.

ISO Blank Flange

Acts as a cover to block flow.


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

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