KF Flanges Introduction

April 28, 2024

They are manufactured according to the DIN 28403/ISO 2861 standard. These are sexless flanges, meaning that both sides of the connection are identical and there are no O-ring grooves cut into the flanges.

The standard sizes are KF10, KF16, KF25, KF40 and KF50. Less common are the KF20 and KF32 sizes.

This flange system is also known by several other names such as NW, QF, DIN, and ISO-KF, but all of these flanges are the same.

The principle of operation is this: a centering ring holding an O-ring is placed between the two flanges and then the flanges are aligned and brought close together. The wing nut clamp (chain clamps are also available) is placed around the two flange faces and the wing nut is tightened. The two flange faces are squeezed toward one another, thus compressing the O-ring.

These flanges are used in the pressure range from atmosphere to as low as 1×10-8Torr or mbar. The operating and bakeout temperature range depends upon the O-ring material. The most common O-ring material is FKM (Viton-A) which is suitable for the operating temperature range of 0 to 180 deg C and can be exposed to short-term temperatures in the range of -26 to 204 deg C. The leakage and permeability rate of these flanges with FKM is 1×10-9std cc/sec of Helium.

The most common material for these flanges is 304/304L stainless steel, but other materials such as 316L, 316LN, and 6061 aluminum are available as well.

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