Description
Blank-off flange, fixed, stainless steel, DN 250 CF is a vacuum accessory designed to close unused ports on CF flange connections in laboratory and technical vacuum systems. The fixed blank-off configuration offers a rigid, non-rotatable seal matched to the DN 250 CF nominal diameter, aligning with ConFlat-style metal-sealed flange practice. Stainless-steel construction supports use in laboratory environments that demand mechanical robustness and compatibility with high-vacuum hardware. Delivered as one piece, the flange functions as a spare or configuration element for vacuum chambers, manifolds, and pump lines. This blank-off flange from manufacturer WELCH forms part of the accessory and spare-parts offering for laboratory equipment and is defined for DN 250 CF geometry. It allows unused CF openings to be blanked cleanly during assembly, service, or system modification while preserving the fixed flange orientation. The component fits standard CF vacuum assemblies employed in analytical, process, and research laboratories that depend on durable stainless-steel flange components for reliable sealing of open ports.
This article is part of Hose connectors, adapters & fittings, in Tubing, hoses & fittings.
Key features
- Pack size: 1 pc
- Product type: Blank-off flange
- Design: Fixed
- Material: Stainless steel
- Nominal size: DN 250 CF
- Flange standard: CF
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Questions about Blank-Off Flange, Fixed, Stainless Steel, DN 250 CF
What is this article?
Blank-Off Flange, Fixed, Stainless Steel, DN 250 CF 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. Delivery across Europe, two to five days when in stock. 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.