Description
Spare O-ring, Viton, DN 40 KF is a replacement sealing element for KF vacuum flanges on laboratory apparatus and vacuum hardware. The ring is made of Viton and matches the DN 40 KF (NW 40) flange standard, providing the elastomer interface between clamped flange faces in modular vacuum systems. It is intended as a service spare when seals must be renewed after mechanical wear, thermal cycling or chemical exposure. DN 40 KF connections are common on pumps, chambers, traps and instrument inlets in research and industrial laboratories. Available as one piece from manufacturer WELCH, this O-ring supports planned maintenance and unplanned seal replacement without changing flange dimensions or clamp hardware. Clear identification by size (DN 40 KF) and material (Viton) simplifies stock keeping for vacuum accessories and laboratory equipment spare parts. Suitable for workshops and facilities that standardise on KF small-flange components across their vacuum infrastructure.
This article is part of Hose connectors, adapters & fittings, in Tubing, hoses & fittings.
Key features
- Pack size: 1 pc
- Product type: Spare O-ring
- Material: Viton
- Nominal size: DN 40 KF
- Connection standard: KF / NW flange
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Questions about Spare O-Ring, Viton, DN 40 KF
What is this article?
Spare O-Ring, Viton, 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.