Description
Blank-off flange, stainless steel, DN 40 KF is a vacuum system component for sealing unused ports on standardised KF (NW) flange connections. Fabricated from stainless steel and dimensioned for the DN 40 KF interface, it is suited to laboratory vacuum pumps, manifolds, process chambers and instrument vacuum inlets that use this flange size. Together with the corresponding clamp and centring ring, the blank-off flange forms a reliable mechanical closure so open KF ports can be capped during installation, modification or service work. The article is supplied as 1 piece, making it convenient as a spare part or as a dedicated blank for a specific vacuum line in research and routine laboratories. This stainless steel blank-off flange from manufacturer WELCH belongs to the accessories and spare parts range for laboratory equipment and supports correct KF geometry on DN 40 connections. Matching the DN 40 KF designation to existing hardware maintains dimensional compatibility across the vacuum train and helps keep unused ports sealed. Source data specify stainless steel construction for general laboratory vacuum use without further surface or performance claims.
This article is part of Hose connectors, adapters & fittings, in Tubing, hoses & fittings.
Key features
- Pack size: 1 pc
- Product type: Blank-off flange
- Material: Stainless steel
- Flange size: DN 40 KF
- Interface: KF (NW) vacuum flange
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Questions about Blank-Off Flange, Stainless Steel, DN 40 KF
What is this article?
Blank-Off Flange, Stainless Steel, DN 40 KF is the article on this page. Luminix Health distributes WELCH for laboratory use. It sits in Hose connectors, adapters & fittings, inside Tubing, hoses & fittings, in Labware.
A hose connector or adapter joins two lines, or steps one bore down to another. The barb diameter has to match the tube, and the thread has to match the stopcock or the bottle. Most leaks are a mismatch here, not a hole in the tube.
Tubing is how a liquid or a gas moves between two vessels without being poured. Silicone stays flexible and survives repeated autoclaving. PTFE resists almost every solvent and is stiff. PVC is the ordinary flexible line for water and for mild aqueous work. The fitting, not the tube, is what usually leaks: the barb, the thread and the stopcock have to match the tube bore. Glass and plastic apparatus around these lines is indexed under ISO laboratory ware.
Which category should I open next?
The category is Tubing, hoses & fittings. The sub-category is Hose connectors, adapters & fittings. The catalogue is Labware.
Shelves beside this one are PVC, PTFE & other tubing, Stopcocks & valves, Silicone tubing and Tubing accessories.
What should I check before I order?
When this page shows a safety data sheet, use that manufacturer file. Hazard text does not belong in the sales description. For a pack size, a grade or a certificate that is not on the page, send a quote request or contact the team.
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Luminix Health distributes this article from the heart of Europe. Articles in stock ship within 2–5 business days. Standard delivery is free from €250 excl. VAT. Cold-chain goods and dangerous goods under ADR are never included in that free delivery. The terms are in the Shipping Policy. The full brand index is on shop by brand. Who we are is on about us.
Which other categories should I open?
The seven catalogues are Labware, Lab chemicals, Lab instruments, Lab consumables, Chromatography equipment, Lab safety equipment and Life Science & Microbiology.