ISO Flanges and Fittings

high vacuum flanges and fittings - ISO Flange  vacuum hardware

Apex Vacuum ISO Flanges & Fittings

ISO Flange Centering RIng
ISO Flange bolted for high vacuum
ISO Flange  Double Claw Clamp

ISO Vacuum Flanges & Fittings

ISO Vacuum Hardware provide quick release capability starting at 63mm and ranging to as high as 500mm. ISO flanges use a similar quick connection to NW Flanges. In general, ISO are larger sized NQ/QF fittings. ISO flanges use a centering ring from an elastomer material with bolts or claw-type clamps to make the vacuum seal. Range of vacuum is from atmosphere down to high vacuum.

Two Types of ISO Vacuum Flanges

ISO high vacuum hardware comes in two different connection types: bolted or clamped. Bolted is commonly referred to as ISO-F, while clamped is called ISO-K. ISO-K is more common because it allows for quick release connections using single or double claw clamps. Single claw systems allow for taped holes on the vacuum chamber itself. Bolted ISO flanges are popular for more industrial connections where the quick release is not a priority.


The standard material of ISO Flanges is 304 stainless steel, and can include aluminum as an alternative metal for the centering rings. Sealing rings (gasket material) that fit on the centering ring can be viton, buna or silicone. Additional materials can be aluminum or 316SS for applications where 304SS is not a proper material.



ISO Flange valve
ISO Flange adaptor
ISO Flange Hose and Bellows