Description
Reducing stopper KNS 45/40 → HNS 29/32 is a short transition piece shaped as a stopper for connecting mismatched ground-glass joints in laboratory apparatus. It provides a cone joint NS 45/40 paired with a socket joint NS 29/32 and is produced to DIN 12257, ensuring dimensional consistency and secure seating. The compact reducing design enables direct size conversion between larger flasks or reactors and smaller condensers, adapters or receivers without bulky intermediate fittings. Offered as one piece with a net weight of 0,071 kg, this glassware component supports distillation, synthesis and vacuum work where reliable joint integrity is required. The stopper-form geometry from manufacturer Witeg facilitates straightforward handling and stable alignment during assembly. Suitable for modular glass systems in research and quality-control laboratories, it streamlines reconfiguration of existing setups to different nominal joint sizes while maintaining a clean, professional connection.
This article is part of Ground-joint glass stoppers, in Stoppers, caps & closures.
Key features
- Pack size: 1 pc
- Cone joint: NS 45/40
- Socket joint: NS 29/32
- Design: Short transition piece in stopper form
- Standard: DIN 12257
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Questions about Short adapter CST 45/40 -> SST 29/32
What is this article?
Short adapter CST 45/40 -> SST 29/32 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.