Safety pins are one of those everyday objects we rarely think about. They sit quietly in sewing kits, junk drawers, and emergency repair bags — simple, reliable, and surprisingly clever. But if you’ve ever looked closely at one, you may have noticed a small hole near the clasp and wondered why it’s there.

It’s not decorative. And it’s definitely not random.

That tiny hole was intentionally designed to make the safety pin even more practical.

A Hidden Function Most People Miss
The small perforation near the clasp allows you to thread a thin cord, string, or piece of thread through it. This serves a very useful purpose: it helps stabilize the pin when attaching it to fabric.

When a safety pin is used on delicate, slippery, or stretchy materials, it can rotate or shift position. By securing it with thread through that tiny hole, you reduce movement and keep it exactly where you want it. It’s a subtle design improvement that makes a big difference in certain situations.

Smart Organization Trick
The hole isn’t just helpful while using the pin — it’s also great for storage.

Crafters and seamstresses often thread multiple safety pins onto a string or loop them together using that tiny hole. This keeps them organized, prevents them from scattering in drawers, and reduces the risk of accidental pricks.

It’s a small feature that makes safety pins easier — and safer — to store.

Useful Beyond Sewing

That little hole also comes in handy outside the sewing world.

In travel or outdoor situations, you can attach a safety pin to:

A keychain

A lanyard

A backpack strap

An emergency repair kit

Keeping it secured and accessible can be incredibly useful for quick fixes — from broken zippers to torn clothing.

Simple Design, Clever Engineering
The safety pin is often credited as one of the most practical small inventions in everyday life. Its design hasn’t changed much over the decades — and that’s because it works.

The tiny hole near the clasp is a perfect example of thoughtful engineering. It adds extra function without adding complexity or cost. Most people never use it — or even notice it — but once you understand its purpose, you start to appreciate how cleverly designed it really is.

Next time you grab a safety pin, take a closer look. That tiny detail isn’t an accident. It’s a quiet reminder that even the simplest objects can hide smart, practical design features in plain sight