The world has a lot of different standards for a lot of things, but I have never heard of a place with the default screw thread direction being opposite.
So does each language have a fun mnemonic?
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I don’t think we have a Swedish one. But we call clockwise “medsols” and counterclockwise “motsols”. Meaning “with the sun” or “against the sun” Does everyone have reversed threads on plumbing or is that a Nordic/Swedish thing? All plumbing has the reversed rule, left tightens and right loosens.
In the plumbing sector, left-hand threads are used whenever two pipe ends need to be connected that cannot be rotated. The connector is then equipped with a left-hand and right-hand thread and can therefore easily be screwed between them.
So it’s not just typical for Nordic countries, but depends on the application.
I could give you an example. In my kitchen we have a faucet with a detachable aerator. We detach it when we want to use a attachment for a garden hose. When attaching the aerator or the garden hose attachment, the threads are reversed. I might be wrong, but two opposing threads shouldn’t be able to screw into one another right?
