ConFlat® flanges for achieving pressures in high vacuum, ultra-high vacuum (UHV) and extreme ultra-high vacuum (XHV) require enormous forces to press the cutting edges with the associated flat gaskets (e.g. copper gasket). These forces are generated by screw connections. The most commonly used hexagon bolts, washers and nuts are made of A2-70 stainless steel. Different configurations of flange connections require different flange set configurations.

The most commonly used variant is designed for flange connections where both flanges are provided with through-holes. In addition, sealing kits are also available for through-hole / threaded hole and through-hole / blind threaded hole combinations. No nut is required for the latter two variants, as the mating flange has a thread or blind thread.