KF components are ISO standard vacuum fittings. Have a flange size of KF10, KF16, KF25, KF40, KF50. They are commonly used to build vacuum line and process systems. KF connection permits rapid fitting and replacement of components in vacuum systems. It consists of two symmetrical KF flanges, a centering ring with O-ring gasket and a clamping ring. High vacuum tight KF connections can be made without the use of tools, simply by turning the wing nut of the clamping ring.