Description
Hexagonal hollow stopper with short ground joint NS 19/17 is a laboratory glassware sealing component for standard ground-joint apparatus. Manufactured from borosilicate glass 3.3, this hollow stopper features a flat hexagonal head that gives a secure grip for insertion and removal in everyday laboratory workflows. The short ground joint NS 19/17 provides a precise, interchangeable fit with corresponding flasks, condensers and reaction vessels. The hollow construction keeps mass low while preserving a durable ground sealing surface. Net weight is 0,008 kg, supporting convenient handling within assembled glassware trains. Available as a single piece, this stopper from manufacturer Witeg is suitable for reliable closure of equipment used in analytical chemistry, organic synthesis and general research. The hexagonal design enables controlled seating of the joint and helps maintain a tight seal under typical atmospheric laboratory conditions. Ideal wherever NS 19/17 short ground joints are required, it integrates readily into existing glassware sets and modular apparatus configurations in teaching, industrial and quality-control laboratories.
This article is part of Ground-joint glass stoppers, in Stoppers, caps & closures.
Key features
- Pack size: 1 pc
- Joint size: NS 19/17
- Material: Borosilicate glass 3.3
- Head shape: Hexagonal, flat
- Construction: Hollow short ground joint
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Questions about ST-hollow stoppers, short joint ST 19/17
What is this article?
ST-hollow stoppers, short joint ST 19/17 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.