Description
Ground joint socket NS 12/21 is a precision female ground-joint component for laboratory glassware, manufactured to DIN 12249. The NS 12/21 taper is combined with an outer diameter of 15 mm, a length of 120 mm and a wall thickness of 1,8 mm, providing a robust intermediate size for everyday apparatus construction. Delivered as one piece with a net weight of 0,019 kg, the socket is designed for secure mating with corresponding cones in distillation trains, reaction setups, extraction lines and analytical glassware. Standardised geometry ensures interchangeability across systems that follow the same Normschliff series, simplifying assembly of flasks, adapters and condensers. Produced by manufacturer Witeg, the part offers consistent dimensional control for laboratories that depend on reliable joint fit without custom machining. Clear data for outer diameter, length and wall thickness support straightforward ordering and stock management in research, process-development and teaching environments where modular DIN ground-joint connections remain fundamental to flexible glassware layouts.
This article is part of Distillation heads, adapters & columns, in Distillation & extraction glassware.
Key features
- Pack size: 1 pc
- Joint size: NS 12/21
- Standard: DIN 12249
- Outer diameter: 15 mm
- Length: 120 mm
- Wall thickness: 1,8 mm
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Verrerie de distillation & d'extraction
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Têtes de distillation, adaptateurs & colonnes
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Questions about Socket ST 12/21, DIN 12249, A-Ø 15 mm,
What is this article?
Socket ST 12/21, DIN 12249, A-Ø 15 mm, is the article on this page. Luminix Health distributes Witeg for laboratory use. It sits in Têtes de distillation, adaptateurs & colonnes, inside Verrerie de distillation & d'extraction, in Matériel de laboratoire.
A still head, an adapter or a column is the glass between the boiling flask and the condenser. A Vigreux or packed column gives the vapour a surface so a closer-boiling mixture can separate. The joint sizes at both ends have to match the flask and the condenser.
Distillation separates liquids by boiling point. A condenser turns the vapour back into liquid: Liebig, coil and cold-finger shapes differ in how much cooling surface they offer. A still head and a column sit between the flask and the condenser. A Soxhlet extractor washes a solid again and again with the same solvent. Ground joints have a standard size, and the joint, not the flask, is what has to match. The pieces are indexed under ISO laboratory glassware.
Which category should I open next?
The category is Verrerie de distillation & d'extraction. The sub-category is Têtes de distillation, adaptateurs & colonnes. The catalogue is Matériel de laboratoire.
Shelves beside this one are Condenseurs, Verrerie à rodage (autre) and Appareils Soxhlet & d'extraction.
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.
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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.