Vacuum Fittings And Flanges ISO / KF
Our range includes a wide assortment of vacuum flanges, couplings and fittings in all industrially standardised sizes – from ISO-KF (NW) and ISO systems to aluminium and stainless steel flanges. These components are essential for the construction and maintenance of vacuum systems, ensuring a reliable, leak-tight and secure connection between the individual parts of the equipment.
KF-type systems (ISO-KF), manufactured according to DIN 28403 and ISO 2861, are designed for use in low and high vacuum up to 1 × 10⁻⁹ mbar. The connection of two flanges is achieved using a sealing ring (centring ring with O-ring, or alternatively an outer retaining ring) and a clamp with a conical surface, which ensures uniform pressure and easy assembly or disassembly.
We supply parts in all industrially standardised sizes – from ISO-KF (NW) and ISO systems to aluminium and stainless steel flanges.
- High leak tightness: up to 10⁻⁹ mbar with the correct selection of seals.
- Modularity: easy assembly of vacuum chambers from pre-prepared parts.
- Flexibility: a wide range of fittings (elbows, T-joints, reducers) for various geometries.
- Fast maintenance: particularly with KF, you can replace parts without tools
Product sorting
List of products
Short Stainless Steel Vacuum Bellows KF/NW 40 - 75mm Length For Flexible Connection Of Vacuum Components Constructed From 316L / 1.4404 Stainless Steel With Two KF40 Flanges, It...
Stainless steel straight reduction ISO-KF 40–25, 30 mm length for connecting flanges of different sizes in vacuum systems. Compact design for connecting KF40 / NW40 with KF25 /...
Stainless Steel Flange KF/NW 16 - 30mm, Vacuum Piping Systems The stainless steel design is intended for welding to piping, vacuum chambers, or other vacuum system components
Stainless Steel Vacuum Elbow KF/NW 25 90° for Changing Vacuum Pipe Direction. Short Version with Dimension A approx. 40 mm and Internal Diameter approx. 22 mm. Suitable for...
Stainless Steel Reducing Cross For Vacuum Lines ISO-KF / NW Two opposing KF40 connections and two KF16 connections allow the main vacuum pipeline to be branched into smaller...
Stainless Steel Flange ISO-KF/NW 25 with 40mm length tube and 1.65mm wall thickness made of 1.4301 (AISI 304) steel for vacuum systems. Suitable for connection with flanges,...
Aluminium hose adapter KF/NW 40 for connecting a vacuum hose to a Ø12 mm barb. Fast and compatible connection in the ISO-KF system (clamp + centering ring + seal). Note: KF40...
Aluminium hose adapter KF/NW 25 for connecting a vacuum hose to a Ø12 mm barb. Fast and compatible connection in the ISO-KF system (clamp + centering ring + seal) Note: KF25...
Aluminium hose reducer KF/NW 10 for connecting a vacuum hose to a Ø12 mm barb. Fast and compatible connection in the ISO-KF system (clamp + centering ring + seal). Note: KF10...
Aluminium Blanking Flange KF/NW 40 - Vacuum Systems Lightweight and durable solution for precise seating and reliable sealing according to ISO/DIN
The KF/NW 40 blanking flange is used for reliable sealing of open vacuum ports in systems operating with a standardised NW 40 connection. Thanks to its stainless steel...
Aluminium Blanking Flange KF/NW 25 - Vacuum Flanges Lightweight, durable and precise solution for reliable system sealing according to ISO/DIN
Stainless Steel Blanking Flange KF/NW 25 For Vacuum Flanges. Robust Design Made Of 304 Steel With High Corrosion Resistance And Long Service Life
Stainless Steel Blanking Flange KF/NW 16 for Vacuum Systems. Corrosion resistant, with long service life and precise fit according to ISO/DIN
Aluminium ISO-KF Blanking Flange for fast and reliable sealing of flanges in vacuum systems. Low weight, easy handling, ISO/DIN compatibility
Stainless Steel Blanking Flange KF/NW 10 for Vacuum Systems. Robust and corrosion-resistant solution for reliable sealing of flanges according to ISO/DIN
Aluminum ISO-KF 40–25 Straight Reducer for Connecting Different Sized Flanges in Vacuum Systems. Lightweight, precise and compatible with all standard KF components
Aluminium ISO-KF 25–10 Straight Reduction For Connecting Flanges Of Different Sizes In Vacuum Systems. Lightweight, precise and compatible with all standard KF components
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Use in Vacuum System Installation
KF type systems (ISO-KF), manufactured according to DIN 28403 and ISO 2861, are designed for use in low and high vacuum up to 1 × 10⁻⁹ mbar. The connection of two flanges is achieved using a sealing ring (centering ring with an O-ring, or an external retaining ring) and a clamp with a conical surface, ensuring uniform pressure and easy assembly or disassembly.
Typical applications:
- Laboratory vacuum systems (analytics, research)
- Surface treatments (PVD, CVD)
- Semiconductor industry
- Vacuum equipment in the food industry
KF and ISO Standards
| Designation | Description | Diameters | Sealing | Assembly speed |
|---|---|---|---|---|
| KF | “Klein Flansch” – small diameter, modular system for fast connection with a clamping ring | DN 10–50 mm | metal (polytetrafluoroethylene)? or elastomer O-ring | very fast (clamp system) |
| ISO | Standardised flanges (ISO-K, ISO-F) for larger diameters and higher requirements | DN 63–500 mm | metal or elastomer O-ring | robust, bolted joints |
KF (DIN 28403)
- Most commonly used in smaller vacuum systems.
- Connection using a wing-nut clamp – tool-free assembly and disassembly in a few seconds.
ISO (DIN 28404)
- Two subtypes: ISO-K (weld-on flange) and ISO-F (flat flange).
- Higher flow rates and larger volume distributions; assembled with bolts and nuts, suitable for both laboratory and industrial vacuum lines.
What is a vacuum flange?
- Flange is a circular part with holes for bolts, which is attached to the edge of a pipe or chamber.
- It ensures a mechanical connection and simultaneously forms a sealing surface for a vacuum seal (O-ring or sealing ring).
What is a vacuum fitting?
- Fitting refers to smaller connecting components – reducers, elbows, T-joints, valve adapters, etc.
- It allows for a change of direction, diameter, or the connection of another attachment in the piping.
Other parts required for a complete installation of a vacuum system - you can also find centring rings, seals, clamps, O-rings and more with us. We supply quality components made from high-grade materials to meet demanding requirements for performance, durability, and cleanliness in vacuum applications.
Whether you are building a new system or need spare parts for existing equipment, you will find everything you need for your vacuum operation here....we would be pleased if you let us know what you didn't find and would like to have available at a click. We are happy to provide you with a custom offer, favourable terms, and prices...
