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ISO-KF Vacuum Flange Components
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Shuangzhan machinery ISO-KF vacuum flange fitting and component system is a modular, building block method for creating 0.75 to 4 inch vacuum piping systems. Series 31 ISO-KF vacuum fittings provide several advantages. They use standardized dimensions allowing ISO KF elbows, tees, crosses or valves for a given size to be interchanged. ISO-KF flanges are also "sexless" and the seal is symmetrical so components can be rotated. The ISO-KF vacuum flange system allows the building of high vacuum systems quickly, without welding or brazing and supports quick and easy cleaning or modification of your vacuum system.

Vacuum Connection Parts and Fittings
Vacuum clamps, O‐rings, centring rings, blanking plates, hose adapters
They are widely used in the assorted vacuum systems and low‐voltage pipe systems, such as electronic, food machinery, the petrochemical industry, and medicine machinery.

Most vacuum fittings come with plastic protective caps which help protect the NW/KF flanges from scratches and dust.


Vacuum flange types
KF / ISO‐K / CF
Klein Flange (DN/NW/KF ISO‐KF)
Klein Flange (KF/NW) fittings are the industry standard for vacuum components in the low and medium vacuum range and can be found on a variety of laboratory, production and test equipment.



"The ISO standard quick release flange is known by the names Quick Flange (QF), Klein Flange (KF) or NW, sometimes also as DN." ‐ Wikipedia.

KF fittings are an economical system of reusable interfacing stainless steel vacuum fittings and components. Each vacuum seal is made by compression of an O‐ring on a centring ring between mating flanges. The seal is made in seconds by finger‐closure of a wing nut on the all‐metal hinged swing clamp.



Many pumps and vacuum gauges use the standard NW/KF flanges for easy integration. Test systems can be readily and quickly built utilising the large selection of NW/KF type components and can be easily modified for new tasks and applications. The NW/KF style vacuum components are available in the standard NW16 to NW50, with some components available in the smaller NW10.



The NW/KF system refers to the internal bore in mm:

NW/KF standard size Internal diameter (mm) External diameter (mm)
NW/KF10 10 30
NW/KF16 16 30
NW/KF25 25 40
NW/KF40 40 55
NW/KF50 50 75
The terms NW, KF or QF all refer to the same standard quick release vacuum couplings.

Most standard NW/KF style quick release vacuum connections are made from a high quality grade 304 stainless steel. Stainless steel is a cleaner, stronger and more durable alternative to aluminium For specific applications, some vacuum components are also available in aluminium. The competitively priced ball valves offer an easy and quick way

ISO fittings (ISO‐K / ISO LF)
ISO fittings are joined by a centring ring and an elastomer o‐ring.



"The ISO large flanges come in two varieties. The ISO‐K (or ISO LF) flanges are joined with double claw clamps which clamp to a circular groove on the tubing side of the flange. The ISO‐F (or ISO LFB) flanges have holes for attaching the two flanges with bolts. Two tubes with ISO‐K and ISO‐F flanges can be joined together by clamping the ISO‐K side with single claw clamps which are then bolted to the holes on the ISO‐F side." ‐ Wikipedia



ISO large flanges are available in sizes from 63 to 500mm nominal tube diameter.

ISO standard size Tube diameter (mm)
DN63LF 63.5
DN100LF 102
DN160LF 160
DN200LF 200
DN250LF 254
DN320LF 316
DN400LF 400
DN500LF 500
Conflat fittings (CF / ISO‐F)
Conflat (CF) fittings use a copper gasket and knife‐edge flange to achieve an ultrahigh vacuum seal.



"Each face of the two mating CF flanges has a knife edge which cuts into the softer metal gasket, providing an extremely leak‐tight, metal‐to‐metal seal. Deformation of the metal gasket fills small defects in the flange..." ‐ Wikipedia



European, Asian size North American size [inches]
DN10 1
DN16 1? ("mini") 1.33"
DN25 2?
DN40 (or: DN35) 2¾ 2.75"
DN50 3?
DN63 4½ 4.5"
DN75 4?
DN100 6 6.0"
DN125 6¾
DN160 (or: DN150) 8 8.0"
DN200 10 10.0"
DN250 12

13¼

14

16½
All of NW/KF style vacuum connections conform to the international ISO 2861/I standard. KF series quick release flanges also comply with Standard GB4982‐85.
Other vacuum components, which may include three‐way types, blind plates, metal flexible corrugated pipes, callipers and bolts, heel blocks and holders, comply with the ISO Standard 9000:2000.


They are widely used in the assorted vacuum systems and low‐voltage pipe systems, such as electronic, food machinery, the petrochemical industry, and medicine machinery.
Our vacuum fittings come with plastic protective caps which help protect the NW/KF flanges from scratches and dust.