Padlocks are everyday tools we rely on to keep our belongings safe—whether locking a bike, a shed, or a toolbox. Though they look simple, they’re built with clever details that help them withstand years of use, especially outdoors. One of the most overlooked features is the tiny hole at the bottom of many padlocks. It seems insignificant, yet it plays a surprisingly important role in keeping the lock functioning when it matters most.
The primary purpose of that small hole is drainage. Because padlocks often face rain, humidity, and temperature changes, water can easily collect inside. Without a way to escape, moisture would cause the internal parts to rust or seize up. This small opening allows water to drain out, preventing corrosion and helping the lock stay reliable. It also serves a second purpose: if a padlock becomes stiff, lubricant can be applied directly through the hole to loosen the mechanism.
