Description
Screw caps N-8 with hole are open-top laboratory closures made from black polypropylene for secure sealing of N-8 neck vials and sample containers. Each cap incorporates a central hole that permits septum insertion or needle access while the threaded body maintains a reliable mechanical seal on compatible glass or plastic vessels. Supplied in packs of 100 pieces, these black PP screw caps support high-throughput sample handling in chromatography, autosampler workflows, headspace analysis and routine quality-control laboratories. The lightweight pack has a net weight of 0,072 kg, facilitating convenient storage and distribution across analytical benches. Manufactured from durable black PP, the closures offer the chemical resistance and mechanical stability expected of polypropylene laboratory fittings. These screw caps from manufacturer Witeg are intended for use wherever open-top N-8 finishes are specified, allowing repeated access without complete removal of the closure. They integrate readily into standard vial systems used for sample preparation, storage and instrumental analysis. The combination of a defined N-8 size, central aperture and robust black PP construction makes them a practical consumable for research, industrial and clinical laboratory environments requiring consistent, interchangeable screw-cap performance.
This article is part of Screw caps & closures, in Stoppers, caps & closures.
Key features
- Pack size: 100 pc(s)
- Product type: Screw caps with hole
- Cap size: N-8
- Material: Black polypropylene (PP)
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Questions about Screw caps N-8 with hole
What is this article?
Screw caps N-8 with hole is the article on this page. Luminix Health distributes Witeg for laboratory use. It sits in Screw caps & closures, inside Stoppers, caps & closures, in Labware.
A screw cap has a thread and a liner. The thread has to match the bottle. The liner has to survive the liquid: a pulp liner fails in a solvent that a PTFE-faced liner ignores. The colour of the cap is not the specification.
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 Screw caps & closures. The catalogue is Labware.
Shelves beside this one are Rubber & silicone stoppers, Ground-joint glass 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.