Description
Expansion adapter KNS 19/26 to HNS 34/35 is a precision ground-glass transition fitting used to couple laboratory glassware of unequal joint sizes. One end presents a cone joint NS 19/26 while the opposite end provides a socket joint NS 34/35, creating a reliable mechanical link between matching apparatus. Manufactured in accordance with DIN 12257, the piece delivers the dimensional consistency required for distillation, reflux and vacuum configurations. Supplied as one piece with a net weight of 0,045 kg, it is offered by manufacturer Witeg and originates from Germany. The expansion geometry steps up from the smaller cone to the larger socket, facilitating apparatus scale changes and the connection of flasks, condensers or adapters with differing neck standards. Clearly indicated NS sizes aid quick selection on the bench. Suitable for organic synthesis, preparative work and routine analytical set-ups that rely on interchangeable ground joints, the adapter seals with ordinary joint grease or retaining clips and needs no specialised hardware beyond standard laboratory practice.
This article is part of Hose connectors, adapters & fittings, in Tubing, hoses & fittings.
Key features
- Pack size: 1 pc
- Product type: Expansion adapter
- Cone joint: NS 19/26
- Socket joint: NS 34/35
- Standard: DIN 12257
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Questions about Expansions adapter ST 19/26 -> ST 34/35
What is this article?
Expansions adapter ST 19/26 -> ST 34/35 is the article on this page. Luminix Health distributes Witeg 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.