Why do so many zippers have the letters YKK stamped on them? Is it some kind of ...

More confounding still: Now that the zipper has been around for nearly a century, you’d think that something so simple might have been perfected—becoming a 100 percent reliable commodity. But that hasn’t happened. There are still tons of faulty zippers out there. Teeth that break. Pulls that pop. Herky-jerky sliding and irreparable lockups.



One zipper gone wrong can render an entire garment unwearable. Thus consistent quality is a must for reputable fashion brands. For decades now, apparel makers who can’t afford to gamble on cut-rate fasteners have overwhelmingly turned to a single manufacturer. YKK, the Japanese zipper behemoth, makes roughly half of all the zippers on earth. More than 7 billion zippers each year. Those three capital letters are ubiquitous—no doubt you’ve seen them while zipping up your windbreaker or unzipping someone else’s jeans. How did YKK come to dominate this quirky corner of industry?

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