Description
Reducing stopper KNS 24/29 → HNS 19/26 is a short transition piece in stopper form for connecting laboratory glassware with different standard ground joints. It provides a male cone joint NS 24/29 and a female socket joint NS 19/26, enabling a clean reduction from the larger joint size to NS 19/26. The geometry follows DIN 12257, supporting interchangeability with common European Normschliff apparatus. Its compact stopper-style body keeps the overall assembly length short, which is useful in crowded fume hoods, distillation trains and multi-neck flask setups. From manufacturer Witeg, the adapter is supplied as a single piece with a net weight of 0,024 kg. Typical uses include organic synthesis, solvent distillation, reaction work-up and general preparative chemistry where reliable, grease-assisted ground-joint seals are required. The robust glass construction withstands routine thermal and chemical exposure in everyday laboratory practice and helps maintain reproducible connections between flasks, condensers, adapters and receivers without bulky intermediate fittings.
This article is part of Ground-joint glass stoppers, in Stoppers, caps & closures.
Key features
- Pack size: 1 pc
- Product type: Short transition piece in stopper form
- Cone joint: NS 24/29
- Socket joint: NS 19/26
- Standard: DIN 12257
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Questions about Short adapter CST 24/29 -> SST 19/26
What is this article?
Short adapter CST 24/29 -> SST 19/26 is the article on this page. Luminix Health distributes Witeg for laboratory use. It sits in Ground-joint glass stoppers, inside Stoppers, caps & closures, in Labware.
A ground-glass stopper matches a ground neck of a stated joint size. A 14/23 stopper does not seal a 29/32 neck. The stopper is part of the flask's seal, and a chip on the grind is a leak.
A closure is the part that decides whether a bottle stays shut and whether the contents attack the seal. A ground-glass stopper matches a ground neck. A screw cap needs the right thread and a liner that survives the liquid. Rubber and silicone stoppers push into a mouth. The liner, not the colour of the cap, is the chemical choice. The vessels they close are indexed under ISO laboratory glassware.
Which category should I open next?
The category is Stoppers, caps & closures. The sub-category is Ground-joint glass stoppers. The catalogue is Labware.
Shelves beside this one are Screw caps & closures, Rubber & silicone stoppers, Lids & seals and Closures (other).
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.