52 States in 8 Months

One-way screws

Posted in University stuff by Ulf on December 29, 2008

Wikipedia knew about them. I didn’t. But the restroom next to our lab has them all over the place. I’m talking about “one-way screws”. They can be tightened like any normal screw, but it will be rather hard to turn them counterclockwise (however, they can be removed anyway).

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I’ve never noticed any screw like that in Germany. We do however have an “Einwegschraube” among the “Sonderschrauben für den Maschinenbau” (the last time I saw this was in the first year of my studies).

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