Read full article in comments What’s the Purpose of That Tiny Hole in a Safety Pin?
A Brilliant Example of Simple Design
The safety pin is proof that even the most ordinary objects can have surprisingly thoughtful engineering behind them. That tiny hole may be easy to overlook, but it helps support the tension that keeps the pin closed and safe to use. It is a small detail with a big purpose. So the next time you grab a safety pin from a sewing kit, a first-aid box, or the bottom of a drawer, take a closer look. What seems like a tiny, meaningless hole is actually one of the features that makes this everyday tool work so well — and why it has stayed almost unchanged for generations.
