¿Por qué todas las cremalleras llevan las letras YKK grabadas?

The zipper on your jacket is likely to have the letters YKK engraved on it. The same can be seen on your trousers and backpack. It's not a coincidence that such a small detail on an otherwise insignificant object is produced by one of the world's most curious industrial giants. According to The Wall Street Journal, the Japanese company sold over 10 billion zippers in a single year, the most recent figures available being from 2024.

That's an astonishing number, which, if placed end to end, would surpass three million kilometers – the equivalent of about 80 trips around the Earth. What's even more remarkable is that this record-breaking achievement is not a one-time feat. YKK had also surpassed this milestone in 2018 and 2021. As autumn approaches and three-quarter zip fleece jackets with chest-high zippers become the undeniable fashion trend, we shine a spotlight on this company that has been refining the very same object for nearly a century.