Description
Reducing adapter KNS 45/40 → HNS 34/35 is a precision ground-joint reducer for connecting laboratory glassware that uses different standard taper dimensions. It features a cone joint NS 45/40 paired with a socket joint NS 34/35, creating a defined step-down between large-neck vessels and intermediate apparatus such as condensers, still heads or receivers. Produced to DIN 12257, the adapter supports interchangeable conical ground joints and reliable sealing when properly prepared for vacuum or atmospheric service. Supplied as a single piece with a net weight of 0,061 kg, it offers a stable yet manageable link within multi-component glass assemblies. This reducing adapter from manufacturer Witeg is intended for modular Normschliff systems where joint-size conversion is required without custom glassblowing. The standardised geometry promotes interchangeability across common European laboratory glassware and helps maintain consistent alignment in distillation trains, reaction setups and preparative lines. Suitable for research, process-development and teaching laboratories, it provides a straightforward mechanical interface between NS 45/40 and NS 34/35 connections while adhering to the dimensional expectations of DIN-compliant ground-joint accessories.
This article is part of Hose connectors, adapters & fittings, in Tubing, hoses & fittings.
Key features
- Pack size: 1 pc
- Cone joint: NS 45/40
- Socket joint: NS 34/35
- Standard: DIN 12257
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Questions about Reduction adapter ST 45/40 -> ST 34/35
What is this article?
Reduction adapter ST 45/40 -> ST 34/35 is the article on this page. Luminix Health distributes Witeg for laboratory use. It sits in Hose connectors, adapters & fittings, inside Tubing, hoses & fittings, in Labware.
A hose connector or adapter joins two lines, or steps one bore down to another. The barb diameter has to match the tube, and the thread has to match the stopcock or the bottle. Most leaks are a mismatch here, not a hole in the tube.
Tubing is how a liquid or a gas moves between two vessels without being poured. Silicone stays flexible and survives repeated autoclaving. PTFE resists almost every solvent and is stiff. PVC is the ordinary flexible line for water and for mild aqueous work. The fitting, not the tube, is what usually leaks: the barb, the thread and the stopcock have to match the tube bore. Glass and plastic apparatus around these lines is indexed under ISO laboratory ware.
Which category should I open next?
The category is Tubing, hoses & fittings. The sub-category is Hose connectors, adapters & fittings. The catalogue is Labware.
Shelves beside this one are PVC, PTFE & other tubing, Stopcocks & valves, Silicone tubing and Tubing accessories.
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The seven catalogues are Labware, Lab chemicals, Lab instruments, Lab consumables, Chromatography equipment, Lab safety equipment and Life Science & Microbiology.