All components are helium leak tested and offer leak rates better than 10^-9 mbar × l/s.

An ISO-KF (small flange) joint consists of two symmetrical flanges and an O-Ring, which is positioned and supported by an inner and an outer centering ring. The force needed for sealing is produced by a clamping ring which is placed over the conical tightening surfaces, and which is then tightened with a wing nut. This type of flange can be assembled and disassembled quickly and effectively without any tools.

ISO-KF joints are suited for pressures ranging from 10^-7 mbar to 2.5 bar and 5 bar respectively with centering rings with outer support features. With metal gaskets the pressure range can be extended to 10^-9 mbar and to 60 bar on the high end. The maximum operating temperature of the joint is determined by the type of sealing material used.

The majority of ISO-KF components are made from corrosion resistant stainless steel. Minimization of the active surface area is achieved by blasting with glass beads as well as electro- or manual polishing processes, all of which ensure a low degassing rate (desorption) of the material.