Description
Reducing stopper KNS 29/32 → HNS 19/26 is a short transition adapter in stopper form designed to link laboratory glassware components of unequal standard ground joint sizes. It combines a male cone joint NS 29/32 with a female socket joint NS 19/26, allowing a larger NS 29/32 connection to be reduced cleanly to NS 19/26. Manufactured to DIN 12257 dimensions, the piece ensures standardised fit and interchangeability with widely used European laboratory glassware. The compact stopper-style design minimises added height and dead volume, which is advantageous in distillation assemblies, reaction setups and space-limited fume-hood work. From manufacturer Witeg, this reducing stopper is offered as one piece with a net weight of 0,045 kg. It is well suited to organic synthesis, solvent recovery, analytical sample preparation and general preparative chemistry where secure, grease-assisted ground-joint seals are essential. The glass construction supports routine thermal cycling and chemical exposure typical of daily laboratory use, delivering dependable mechanical connections between flasks, condensers and downstream adapters.
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 29/32
- Socket joint: NS 19/26
- Standard: DIN 12257
- EAN: 4046681015632
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Questions about Short adapter CST 29/32 -> SST 19/26
What is this article?
Short adapter CST 29/32 -> 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.