Description
Expansion adapter KNS 14/23 to HNS 34/35 is a ground-joint transition fitting designed to link a compact cone joint to a substantially larger socket in laboratory glass apparatus. The piece carries a cone (Kern) NS 14/23 and a socket (Hülse) NS 34/35 and is manufactured to DIN 12257, ensuring compatibility with standard European Normschliff systems.
This article is part of Hose connectors, adapters & fittings, in Tubing, hoses & fittings.
Offered as one piece with a net weight of 0,049 kg, the adapter provides a direct mechanical expansion path from small-scale NS 14/23 connections to NS 34/35 ports. It is well suited to distillation columns, receiver setups and multi-neck reaction vessels where joint-size conversion must remain vacuum-tight and dimensionally stable. Produced by Witeg in Baden-Württemberg, Germany, the component integrates cleanly into existing glassware trains without additional couplings.
Laboratories that routinely combine micro- and macro-scale glassware benefit from this standardised expansion piece, which maintains alignment and sealing performance across the joint interface while simplifying apparatus layout and reducing the risk of mismatched connections.
Key features
- Pack size: 1 pc
- Cone joint: NS 14/23
- Socket joint: NS 34/35
- Standard: DIN 12257
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Questions about Expansions adapter ST 14/23 -> ST 34/35
What is this article?
Expansions adapter ST 14/23 -> 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.
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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.