The Baffling Reason Padlocks Have a Tiny Hole at the Bottom

The other day, I was out in the garden trying to open the old padlock on my shed. It had been raining heavily the night before, and the lock was covered in water. As I fumbled with the key, I turned the lock over and noticed something I had somehow never seen before.

Right next to where you insert the key, there was a tiny, perfectly round hole drilled into the bottom of the metal casing.

My first thought was that it was a flaw, or maybe a way for a thief to stick a wire in and pick the lock. But after doing a little digging, I realized that this tiny hole is actually one of the smartest, most essential design features of the entire padlock.

If you are using a padlock outdoors, that little hole is quite literally a lifesaver for the lock.

It serves two very important purposes. First, it is a drain hole. When it rains, water inevitably seeps into the lock through the shackle at the top. If that water had nowhere to go, it would just sit inside the metal casing, slowly rusting the internal mechanisms until the lock jammed completely. Worse, in the winter, that trapped water would freeze, expand, and physically break the lock from the inside out. The hole at the bottom lets the water drain right out, keeping the lock functional.

The second purpose is maintenance. If your lock ever starts feeling stiff or the key is hard to turn, that tiny hole is your access point. You can squirt a little bit of graphite powder or lock lubricant directly into the hole. It will coat the internal pins and springs, making the lock feel brand new again.

So, if you are ever buying a padlock for your fence or shed, always check the bottom. If it doesn't have that little hole, you are going to be buying another one very soon! It is amazing how much engineering goes into things we just ignore every day.