What is that little hole at the bottom of a padlock for? This clever design feature prevents rust, lets water drain, allows lubrication when locks jam, and reveals how everyday objects often hide smart engineering details that make life safer and easier.
That small opening at the bottom of a padlock is much more than a stray manufacturing detail. It exists to keep the internal mechanism alive. Rain, snow, and humid air can seep into the body of a lock, and without a place for that moisture to escape, the metal parts inside would seize up. The…