ISO-K / ISO-F Flanges & Components

ISO-K (Clamped) flange connections are used similarly to KF connections, but they achieve the interlocking between the flanges and the compression of the elastomer O-ring seal through clamping screws. They are used for larger nominal sizes compared to KF and are compatible with ISO-Fixed flanges (ISO-F) when using appropriate clamp flanges. ISO-Fixed flanges are assembled using screws and nuts.

The dimensions of ISO flanges are specified in DIN 28404 and ISO 1609 standards, and standardized flange sizes range from DN63 to DN1000.