Description
Reducing adapter KNS 40/38 → HNS 19/26 is a ground-joint transition fitting that bridges larger and smaller standard taper connections in laboratory glassware assemblies. Equipped with a cone joint NS 40/38 and a socket joint NS 19/26, it enables controlled size reduction between reaction vessels, condensers, adapters and downstream apparatus used in organic synthesis, distillation and preparative work. Compliance with DIN 12257 ensures dimensional compatibility with interchangeable conical ground joints and supports consistent, grease-sealed connections under normal laboratory conditions. The unit is offered as one piece and has a net weight of 0,041 kg, remaining practical to handle while providing a robust mechanical link. This reducing adapter from manufacturer Witeg forms part of the established Normschliff reducer range for modular glass setups. By converting an NS 40/38 cone interface to an NS 19/26 socket, it simplifies apparatus layout when vessel necks and peripheral glassware differ in joint size, reducing the need for custom-blown pieces. Ideal for research and routine laboratories that rely on standardised European joint systems, it delivers a clear, repeatable transition between the stated NS sizes while preserving the fit and interchangeability expected of DIN-specified ground-joint components.
This article is part of Hose connectors, adapters & fittings, in Tubing, hoses & fittings.
Key features
- Pack size: 1 pc
- Cone joint: NS 40/38
- Socket joint: NS 19/26
- Standard: DIN 12257
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Questions about Reduction adapter ST 40/38 -> ST 19/26
What is this article?
Reduction adapter ST 40/38 -> ST 19/26 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?
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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.