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I can't remember for the life of me, and google isn't making it easy. e.g. the things labeled 24/40 etc., as in this picture:

enter image description here

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3 Answers 3

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Those are called Keck Clips. 24/40 is the size of the joint.

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  • $\begingroup$ in mm, I guess? $\endgroup$
    – khaverim
    Commented Jun 28, 2017 at 21:23
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    $\begingroup$ @khaverim very likely, as it is a Swiss idea (worldwide.espacenet.com/publicationDetails/…) $\endgroup$
    – Buttonwood
    Commented Jun 28, 2017 at 21:26
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    $\begingroup$ Yes more or less, it's not the exact value. en.wikipedia.org/wiki/Ground_glass_joint describes the different types and the german wikipedia page actually shows the biggest diameter mm values. It's all in ISO 383 $\endgroup$
    – DSVA
    Commented Jun 28, 2017 at 21:27
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They are called Keck clamps.

Here's a link to the page for ChemGlass: http://www.chemglass.com/product_view.asp?pnr=CG-145

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    $\begingroup$ There are versions in metal, too; like vaporbrothers.com/Metal-Keck-Clip-19mm_ProductID_8766 $\endgroup$
    – Buttonwood
    Commented Jun 28, 2017 at 21:31
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    $\begingroup$ They are clips not clamps $\endgroup$ Commented Jun 28, 2017 at 22:02
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    $\begingroup$ @JamesDealon Please direct your comment to ChemGlass. I don't have strong feelings about the name. The important part is "Keck." $\endgroup$
    – Zhe
    Commented Jun 28, 2017 at 23:43
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The clips are named after Hermann Keck - Chemistry World's Classic Kit columnist, Andrea Sella, spoke to him to get the story of the invention before he died a few years ago. https://www.chemistryworld.com/opinion/classic-kit-keck-clip/3004921.article

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