A padlock may seem like a simple everyday item, but its design includes small details that play a big role in how it functions. One of the most overlooked features is the tiny hole found at the bottom of many padlocks. While most people assume it’s just part of the manufacturing process, the hole is actually intentional — and essential. Padlocks are often used outdoors and exposed to harsh weather, so this opening allows water to drain out instead of collecting inside the lock. Without it, moisture would build up, leading to rust, corrosion, and eventually a lock that fails long before its time.
Beyond preventing rust, the hole also serves another practical purpose: maintenance. Over time, padlocks can become stiff or difficult to open, especially if they’ve been exposed to dirt, dust, or cold weather. The tiny hole offers a direct point where lubricants like WD-40 or graphite can be applied. By spraying lubricant into that opening, the internal mechanism loosens more effectively, helping the padlock open smoothly. This small design choice often extends the life of the lock significantly, saving owners from having to replace it unnecessarily.
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