Question about Master Lock 5400d: Portable Select Access Key Storage Lock

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I have one of those circular master locks, but i forgot my combination, i panicked so i tried to bust it open with a hammer now its busted up, closed, and there is no dial on it, what do i do?

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You'll have to complete the destruction job and cut off the lock or drill into it. As the lock is designed to resist these attacks it may be cheaper and quicker to call in a locksmith who will have the skills, tools and experience to do the job safely.

Usually I'd advise the use of a bolt-cropper, but the shape of your lock makes applying one very difficult.

There is a cheap option which may work but is trickier than YouTube videos make it look: use a shim on the lock shank. Just search for "lock shim" and you'll see examples of how to do it. Trying it costs almost nothing and so it's the first thing I recommend that you try.

Good luck and please take a moment to rate my answer.

Posted on Aug 03, 2010


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How do you open a master lock model 5400d if you forgot the combination

It would appear that you made a mistake in setting your new combination on your Master Lock 5400d and did not register the combination at The only way to open your lock is by using the correct combination. There is no other way. Most mistakes are normally one or two digits out, so you may wish to try variations on what you thought you set.

Apart from that you can either try every possible combination or you will need to contact the manufacturer. But they cannot assist you if the lock does not have a serial number (they recently stopped applying serial numbers for greater security) and they will not assist if the lock is already secured to anything. There are a number of other hurdles as well, click here for details. Given that they state that you will have to wait four to six weeks for an answer, it's going to be far quicker to just try every possible combination.

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