Description
Centering ring with Perbunan O-ring, stainless steel, DN 40 KF is a compact vacuum-connection accessory designed for laboratory and technical setups that use the KF (small flange) interface. The ring combines a stainless-steel body with an integrated Perbunan elastomer O-ring, providing the sealing element required when mating DN 40 KF flanges. This format is widely recognised in laboratory vacuum lines, pump connections and instrument interfaces where a reliable, demountable joint is needed. Supplied as a single piece, the component serves as a spare or replacement part within existing KF assemblies and supports routine maintenance of vacuum apparatus. The stainless-steel construction pairs with the Perbunan seal to match standard DN 40 KF geometry, helping keep flange faces aligned and sealed during assembly. From manufacturer WELCH, the centering ring fits naturally into accessory inventories for laboratory equipment, vacuum manifolds and related instrumentation. Its clear designation—centering ring, Perbunan O-ring, stainless steel, DN 40 KF—makes selection straightforward when ordering replacements or completing a KF hardware set for everyday laboratory use.
This article is part of Hose connectors, adapters & fittings, in Tubing, hoses & fittings.
Key features
- Pack size: 1 pc
- Product type: Centering ring with O-ring
- Body material: Stainless steel
- O-ring material: Perbunan
- Nominal size: DN 40 KF
- Flange standard: KF (small flange)
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Questions about Centering Ring with Perbunan O-Ring, Stainless Steel, DN 40 KF
What is this article?
Centering Ring with Perbunan O-Ring, 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.