This may have escaped your notice, but most padlocks actually have either one or two tiny holes in the bottom. So, one could easily wonder, what’s their actual purpose?
Well, the reason is twofold.
Since more often than not padlocks are used outdoors, the holes in the bottom prevent it from rusting by letting the water drain out. That’s why they are called ‘drain holes’. In addition, it prevents water from freezing inside the lock, something that would have caused serious damage as there is no expansion room. But there’s also another very handy use of the holes. (the article continues after the ad)
In case your lock is stuck and you cannot open it, you can pour engine oil or WD-40 (remember when we talked about the 12 Amazing WD-40 Uses You Never Thought Of?) in the holes and this will help you turn the key without any difficulty. When you drip the oil, make sure you let it stand for a minute before dripping oil again. Let it stand for one more minute or till it drips through the drain hole and use your key. Your lock should now work perfectly!
If you like what you read, then you will definitely love this one: This Is Why Golf Balls Have Dimples
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Sources: SO THAT’S WHAT IT’S FOR!The hole in the end of your saucepan handle and 8 other things you never knew had an actual purpose | Care and Maintenance For Rusting Padlocks