this post was submitted on 09 Feb 2026
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No Stupid Questions

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It’s my understanding that mass produced items are all basically the same. If you buy something like a toothbrush, for example, then any other toothbrush from that same assembly line is going to be basically the same and have all the same specs (with the exception with minor defects here and there), because the machinery and process to make any those toothbrushes are all basically the same.

But that can’t be the case with locks and keys. Because if every lock and key were the same then there’d be no point in having them. Anyone could just bought the same key/lock combo could use it to unlock your front door. So all or most keys and locks must be unique. So how are they mass produced in a way that preserves their uniqueness?

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[–] asmoranomar@lemmy.world 51 points 2 days ago (15 children)

Actually, a lot of locks ARE the same. I lived in a brand-new complex years back, and everyone had the same lock and key. It didn't take long for some kids to start breaking into other people's houses, and since it was all under HOA owners couldn't just buy mismatched locks.

Then when I bought a 10 yr old home later, I was sitting at the house when some maintenance crew unlocked my door and walked right in. They tried to tell me I was squatting and it wasn't until they realized they were to do work on my neighbors house. Went and checked with other neighbors and found out a handful of us all had the same keys of about 4 varieties. Ironically, there were even two families that knew this before then and they told us how they bought new locks - and found out that those too were the same key.

So basically, if you buy a new lock, you should have it checked by a locksmith and rekeyed if needed.

[–] ColeSloth@discuss.tchncs.de 4 points 2 days ago (1 children)

Most apartment locks and such are made for the purchaser to be able to easily and quickly re-key. You set it to be rekeyed, put a cut key in, and then lock the key pattern for it in place. Takes like 5 minutes or less. That way every time someone moves out you can keep things secure without replacing the lock.

In your case, the building manager was just a lazy fuck.

It is common for lock makers of normal locks to do production runs of just like 50 different key sets.

[–] asmoranomar@lemmy.world 3 points 2 days ago* (last edited 2 days ago)

There was a building manager (if it could be called as such) but they were responsible for coordinating mandatory inspections (fire hazards, alarms, etc) and common areas. They were absolutely not responsible for keys. Not all places are the same.

Edit: Should also mention people owned these properties, it wasn't rental apartments.

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