Special offer - Delivery now £4.99 when ordered onlineKF/NW/QF vacuum connection hardware, components and vacuum hoses
EM-Tec standard KF vacuum flange hardware components and parts are directly compatible with all KF, NW or QF vacuum flange hardware connections. Interchangeable designations for these standard rough and medium vacuum flange connections are: KF, DN-KF, ISO-KF, NW, ISO-NW, QF and DN. Standard sizes offered are:
- DN10KF (adapts to DN16KF), DN16KF, DN25KF, DN40KF and DN50KF
Most components are offered in stainless steel, however, for adaptors vacuum grade aluminium alloys are sometimes preferred. Standard KF vacuum flanges are extensively used to connect vacuum components on a range of vacuum systems, including coating systems, electron microscopes, vacuum ovens, vacuum pumps, vacuum gauges etc.
Dimensions of DN-KF flanges
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Dimensions (mm) |
DN10KF |
DN16KF |
DN25KF |
DN40KF |
DN50KF |
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Flange OD ØA |
30 |
30 |
40 |
55 |
75 |
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Centering seal ØB |
12.2 |
17.2 |
26.2 |
41.2 |
52.4 |
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Vacuum line ID ØC |
10 |
16 |
24 |
40.5 |
51 |
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Vacuum line OD ØD |
14 |
20 |
28 |
44.5 |
57 |
We offer:
- EM-Tec KF flange adaptors with 1/8” female NPT thread. Made from vacuum grade aluminium for connecting components such as vacuum gauges, small valves and NPT connectors with 1/8” male NPT thread
- EM-Tec KF flange adaptors with 1/8” female NPT thread. Made from vacuum grade AISI 304 stainless steel
- EM-Tec KF flange adaptors with 1/4” female NPT thread and with 1/4” male NPT thread
- EM-Tec KF vacuum flange centering seals. Consisting of a stainless steel centering ring and a Viton O-ring. They are placed between the KF flanges and seal when the flanges are pushed together by wing nut clamps
- EM-Tec KF vacuum flange centering seals with centering ring and Viton O-ring. Available with stainless steel 304 centering ring and aluminim centering ring
- EM-Tec replacement O-rings for worn or damaged centering seals. O-rings are made from NBR (Nitrile) and are slightly softer than the Viton seals to provide a secure seal in vacuum lines. Sold in packages of 10
- EM-Tec quick-release hinged clamps which are placed around the KF vacuum flanges. By turning the wing nut, the hinged clamp closes and seals the O-ring on the KF vacuum flanges. Made from aluminium with stainless steel pins, bolt and wing nut
Vacuum hoses
EM-Tec Flextube clear, wire reinforced thick wall PVC vacuum hose
EM-Tec Flextube is a clear, wire-reinforced thick wall PVC vacuum for making flexible and custom vacuum hoses. Made from corrosion resistant clear thick wall PVC with embedded zinc plated spring steel wire. This flexible yet strong hose allows for relatively sharp bends and will not collapse under vacuum. Outside and inside of the PVC vacuum hoses are smooth. The smallest bending radius is approximately 3.5 times the outside diameter. To prevent vacuum leaks, use hose clamps to tighten the PVC vacuum hose on the vacuum hose adaptors. Current choice includes: 16mm and 25mm ID PVC vacuum hoses. Available in lengths up to 10 metres.
EM-Tec DN-KF Flextube PVC vacuum hoses
The ready to use EM-Tec DN-KF Flextube vacuum hoses are made from EM-Tec Flextube clear, wire reinforced PVC hose with KF hose adaptors on each end. They are available with KF16 and KF25 flanges with lengths from 0.5 to 5 metres.
For vacuum pumps click here
Ordering information (click on image for larger view)
Fittings, connectors etc
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 DN16KF adaptor to 1/8" NPT female thread, aluminium |
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 DN25KF adaptor to 1/8" NPT female thread, aluminium |
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 DN40KF adaptor to 1/8" NPT female thread, aluminium |
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 DN50KF adaptor to 1/8" NPT female thread, aluminium |
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 DN16KF adaptor to 1/8inch NPT female thread, 304 stainless steel |
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 DN25KF adaptor to 1/8" NPT female thread, 304 stainless steel |
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 DN40KF adaptor to 1/8" NPT female thread, 304 stainless steel |
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 DN50KF adaptor to 1/8" NPT female thread, 304 stainless steel |
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 DN10/16KF adaptive seal from KF10 to KF16 with 304 stainless steel centering ring with Viton O-ring |
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 DN16KF seal with 304 stainless steel centering ring with Viton O-ring |
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 DN40KF replacement O-ring for KF40 centering ring, NBR |
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 DN50KF replacement O-ring for KF50 centering ring, NBR |
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 EM-Tec DN16KF centering ring with screen plate, 0.4mm holes, 28 mesh, 304 stainless steel and Viton O-ring (each) |
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 EM-Tec DN25KF centering ring with screen plate, 0.4mm holes, 28 mesh, 304 stainless steel and Viton O-ring (each) |
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 DN16KF quick release hinged wing nut clamp, aluminium |
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DN25KF quick release hinged wing nut clamp, aluminium |
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DN40KF quick release hinged wing nut clamp, aluminium |
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DN50KF quick release hinged wing nut clamp, aluminium |
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 DN16KF blank flange, 304 stainless steel |
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 DN40KF blank flange, 304 stainless steel |
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DN50KF blank flange, 304 stainless steel |
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 DN16KF hose adapter for 16mm ID hose, L=35mm, 304 stainless steel (each) |
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 DN25KF hose adapter for 6mm ID hose, 304 stainless steel (each) |
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 DN25KF hose adapter for 25mm ID hose, L=35mm, 304 stainless steel (each) |
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 EM-Tec DN16KF 90 degrees elbow, L = 40 mm, 304 stainless steel (each) |
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 EM-Tec DN25KF 90 degrees elbow, L = 50 mm, 304 stainless steel (each) |
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 EM-Tec DN16KF equal T connector, L = 80mm, H = 42 mm, 304 stainless steel (each) |
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EM-Tec DN25KF equal T connector, L = 100mm, H = 55 mm, 304 stainless steel (each) |
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 DN16KF hose adaptor for 6mm ID hose, L=35mm, 304 stainless steel (each) |
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 EM-Tec DN16KF manual vent valve, H = 40mm, 304 stainless steel (each) |
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 EM-Tec DN25KF manual vent valve, H = 44mm, 304 stainless steel (each) |
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 Hose clamp for 12mm OD hose used on 6mm vacuum hose adapters, stainless steel (pkg/2) |
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 Hose clamp for 23mm OD hose used on 16mm vacuum hose adaptors, stainless steel (pkg/2) |
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 Hose clamp for 33mm OD hose used on 25mm vacuum hose adapters, stainless steel (pkg/2) |
Vacuum hoses
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 EM-Tec Flextube 16mm thick walled clear PVC wire reinforced vacuum hose, diam. 16 x dia. 23mm, 1m length (1 metre) |
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EM-Tec Flextube 16mm thick walled clear PVC wire reinforced vacuum hose, dia. 16 x diam. 23 mm, 10 m length (1 metre) |
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EM-Tec Flextube 16mm thick walled clear PVC wire reinforced vacuum hose, dia. 16 x dia. 23 mm, 2 m length (2 metre) |
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EM-Tec Flextube 16mm thick walled clear PVC wire reinforced vacuum hose, dia. 16 x dia. 23 mm, 1m length (1 metre) |
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EM-Tec Flextube 16mm thick walled clear PVC wire reinforced vacuum hose, dia. 16 x dia. 23 mm, 4 m length (4 metre) |
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EM-Tec Flextube 16mm thick walled clear PVC wire reinforced vacuum hose, dia. 16 x dia. 23mm, 5m length (5 metres) |
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 EM-Tec Flextube 25 thick walled clear PVC wire reinforced vacuum hose, dia. 25 x dia. 33mm, 1m length (1 metre) |
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EM-Tec Flextube 25 thick walled clear PVC wire reinforced vacuum hose, dia. 25 x dia. 33mm, 10m length (10 metre) |
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EM-Tec Flextube 25mm thick walled clear PVC wire reinforced vacuum hose, dia. 25 x dia. 33mm, 2m length (2 metre) |
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EM-Tec Flextube 25mm thick walled clear PVC wire reinforced vacuum hose, dia. 25 x dia. 33mm, 3m length (3 metre) |
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EM-Tec Flextube 25mm thick walled clear PVC wire reinforced vacuum hose, dia. 25 x dia. 33mm, 4m length (4 metre) |
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EM-Tec Flextube 25mm thick walled clear PVC wire reinforced vacuum hose, dia. 25 x dia. 33mm, 5m length (5 metre) |
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 EM-Tec Flextube DN16KF clear PVC vacuum hose with stainless steel KF16 hose adaptors, 0.5m length (0.5 metre) |
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EM-Tec Flextube DN16KF clear PVC vacuum hose with stainless steel KF16 hose adaptors, 1m length (1 metre) |
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EM-Tec Flextube DN16KF clear PVC vacuum hose with stainless steel KF16 hose adaptors, 2m length (2 metre) |
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EM-Tec Flextube DN16KF clear PVC vacuum hose with stainless steel KF16 hose adaptors, 3m length (3 metre) |
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EM-Tec Flextube DN16KF clear PVC vacuum hose with stainless steel KF16 hose adaptors, 4m length (4 metre) |
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EM-Tec Flextube DN16KF clear PVC vacuum hose with stainless steel KF16 hose adaptors, 5m length (5 metre) |
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EM-Tec Flextube DN25KF clear PVC vacuum hose with stainless steel KF25 hose adaptors, 0.5m length (0.5 metre) |
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 EM-Tec Flextube DN25KF clear PVC vacuum hose with stainless steel KF25 hose adaptors, 1m length (1 metre) |
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EM-Tec Flextube DN25KF clear PVC vacuum hose with stainless steel KF25 hose adaptors, 2m length (2 metre) |
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EM-Tec Flextube DN25KF clear PVC vacuum hose with stainless steel KF25 hose adaptors, 3m length (3 metre) |
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EM-Tec Flextube DN25KF clear PVC vacuum hose with stainless steel KF25 hose adapters, 4 mtr length (4 meter) |
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EM-Tec Flextube DN25KF clear PVC vacuum hose with stainless steel KF25 hose adaptors, 5m length (5 metre) |