Description
The replacement stopcock key 3 NS/12 with PTFE lock and 2,5 mm bore is a spare cock plug for laboratory burettes of 25 ml and 50 ml fitted with a straight stopcock. It restores reliable open–close control on titration glassware when the original key is worn, damaged or no longer seals correctly. The PTFE lock secures the key in the NS/12 joint, supporting stable seating during repeated use. A bore of 2,5 mm provides a defined flow path through the straight stopcock body. This spare part from manufacturer Brand is intended specifically as an Ersatz-Küken (replacement key) for straight-stopcock burettes in the 25 ml and 50 ml range, not as a complete burette. Supplied as a single piece, it suits maintenance of volumetric glassware in analytical, teaching and quality-control laboratories where titration accuracy depends on a tight, smoothly operating stopcock. Using a matching NS/12 key with PTFE lock helps keep existing burette assemblies in service without full instrument replacement when only the cock plug needs renewal.
This article is part of Burettes, in Volumetric glassware.
Key features
- Pack size: 1 pc
- Type: Replacement stopcock key 3 NS/12
- Lock: PTFE
- Bore: 2,5 mm
- Suitable for: Burettes 25 ml / 50 ml, straight stopcock
- EAN: 4033378251640
Recently viewed
You may also like
Browse related categories
Category
Sub-category
Catalogue
Brand
Questions about Straight burette stopc./spare key PTFE, f. burette cap. 25+50 ml securing device
What is this article?
Straight burette stopc./spare key PTFE, f. burette cap. 25+50 ml securing device is the article on this page. Luminix Health distributes Brand for laboratory use. It sits in Burettes, inside Volumetric glassware, in Labware.
A burette delivers a measured volume through a stopcock, which is how a titration is read. Class A and class AS state the tolerance. The stopcock, glass or PTFE, and the volume of the burette are the choices. A dirty bore changes the delivered volume.
Volumetric glassware is glass that has been calibrated to contain or to deliver one stated volume at a reference temperature. That calibration is the whole point. Class A and class AS have a tighter tolerance than class B. A volumetric flask contains. A pipette and a burette deliver. A measuring cylinder is the coarser reading, used when the volume is not the result. The classes sit under ISO laboratory glassware. The chain back to the unit of volume is the work of the BIPM and of NIST.
Which category should I open next?
The category is Volumetric glassware. The sub-category is Burettes. The catalogue is Labware.
Shelves beside this one are Volumetric flasks, Measuring cylinders, Mixing cylinders and Volumetric accessories & certificates.
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.