Description
Reducing adapter KNS 71/51 to HNS 45/40 is a precision ground-joint transition fitting that bridges two different standard taper sizes in laboratory glass apparatus. It provides a cone NS 71/51 paired with a socket NS 45/40, enabling a larger male joint to connect cleanly to a smaller female joint in distillation, reflux, and vacuum setups. Supplied as one piece with a net weight of 0,161 kg, the adapter supports modular assembly of complex glass trains where dimensional compatibility must be achieved without custom glassblowing. From manufacturer Witeg, this reducing piece forms part of the familiar normschliff transition series used in chemical synthesis, analytical preparation, and teaching laboratories. Interchangeable cone and socket geometry matches common European ground-joint standards, so flasks, condensers, receivers, and other components can be rearranged quickly and repeatably. Ideal wherever NS 71/51 and NS 45/40 joints must be combined, the fitting contributes to leak-resistant, flexible apparatus design. Research, quality-control, and educational labs benefit from straightforward installation, robust mechanical fit, and easy cleaning between successive experiments involving mixed joint sizes.
This article is part of Hose connectors, adapters & fittings, in Tubing, hoses & fittings.
Key features
- Pack size: 1 pc
- Product type: Reducing adapter (ground joint)
- Cone NS: 71/51
- Socket NS: 45/40
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Questions about Reduction adapter ST 71/51 -> ST 45/40
What is this article?
Reduction adapter ST 71/51 -> ST 45/40 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.
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.