Description
Blank-off flange, aluminium, DN 40 KF is a compact vacuum accessory designed to seal unused KF ports on laboratory vacuum manifolds, pumps and process lines. The DN 40 KF geometry matches standard small-flange (ISO-KF) interfaces, allowing quick clamp mounting without tools beyond a conventional centering ring and clamp. Manufactured in aluminium, the flange offers a favourable strength-to-weight ratio for benchtop and mobile vacuum setups while remaining compatible with typical laboratory vacuum hardware. Supplied as a single piece from manufacturer WELCH, it is intended as a spare or expansion component within vacuum systems used in analytical, preparative and general laboratory environments. The blank-off design closes open ports to maintain system integrity, reduce leak paths and protect unused connections during operation or storage. Suitable for integration with KF-based vacuum trains, roughing lines and accessory branches where a reliable aluminium blank is required.
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: Aluminium
- Flange size: DN 40 KF
- Connection standard: ISO-KF (small flange)
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Questions about Blank-Off Flange, Aluminium, DN 40 KF
What is this article?
Blank-Off Flange, Aluminium, 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.
How does ordering and shipping work?
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.