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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[–] XeroxCool@lemmy.world 0 points 2 days ago (2 children)

"Made on the same assembly line means it's the same product" is a myth from people who have no experience in manufacturing/sourcing and are just mad about inflation and do not have a professional interest in the product. The specs are rarely the same. There are often typically significant differences in material, tooling, QA/QC, and warranty. Yes, there are plenty of examples where the upcharge is not justified, but it's neither the rule nor the exception. It varies wildly across the market. I have my places where I buy premium, I have my places where I buy bottom tier.

For the common end user of household products, the closest they'll get to understanding this is buying the Amazon, Alibaba, or Temu "version" of something. There will be a dozen differences that make the product worse. Maybe that's fine for your use. If you think all toothbrushes are the same, try the free ones from a hotel. The handles are small, weak, and usually have sharp mold parting lines. But sure, they were likely made at the same place that made the $6 Colgate because the bristle-placing machine is the most important part of the process.

Meanwhile, towards the other end, a casual household end user will likely never exceed the capability of a hardware store wrench, so they'll think it's insane to pay more for a Snap-on at 4x the price. But it makes a difference to someone using and abusing it 8x a day, depending on its function to get paid. If it does break, the warranty replaces it immediately. Lifetime warranties from non-professional brands are notorious for stating it's the lifetime of the product, not your lifetime, and it expired when it broke or wore out.

At the extreme end would be something like aircraft parts. The "same" bolt at the local store is 1/20 the price. But the aircraft bolt is a higher grade (more expensive), has much tighter tolerances (more money spent on control, higher scrap rate), has backing traceability documentation (money spent on labor and tracking systems), and is likely checked 100% to dimensional spec (money spent on labor and time). You could find the same bolt at the store. You will find a bolt that's almost the same. You may find a bolt that's completely wrong. None of that uncertainty is allowable in an aircraft bolt. Those "minor defects here and there" like your toothbrush claim are not acceptable, so systems must be in place to prevent them from escaping. You order a bolt, you get the bolt you ordered. Hundreds of lives depend on it.

[–] FluorineBalloon@programming.dev 3 points 2 days ago (1 children)

If that's not an AI response, then you really just took the time to write an essay answer to a completely different question than was asked...

[–] XeroxCool@lemmy.world 2 points 2 days ago (1 children)

You're welcome to that interpretation. I saw no point adding a 20th version of the same answers everyone else focused on. I went after the opening statement.

[–] FluorineBalloon@programming.dev 1 points 1 day ago (1 children)

While I feel like your post was off topic, it was not kind of me to reply to you with such rudeness, and with the accusation of being ai. I should not allow my annoyance with the prevalence of ai in nearly every aspect of life lately to cause me to be kind to my fellow humans. I'm sorry for my attitude, and thankful that you and others contribute to the fediverse even when I don't understand or misinterpret it.

[–] XeroxCool@lemmy.world 2 points 1 day ago* (last edited 1 day ago)

It's fine. To add to it, I couldn't edit my own comment yesterday to highlight why I went in a different direction. Now I have. It's not the first time I've been called AI because I write lengthy things about topics in which I'm knowledgeable. Xkcd.com/3126

[–] Slein4273@feddit.org 3 points 2 days ago (1 children)

I think you forgot to answer the question

[–] XeroxCool@lemmy.world 1 points 2 days ago (1 children)

No point saying the same thing already stated 20 other times here. I went after the opening statement because it's demonstrably inaccurate

[–] ageedizzle@piefed.ca 1 points 2 days ago (1 children)

“Made on the same assembly line means it’s the same product” is a myth from people who have no experience in manufacturing/sourcing

You’re right, I have absolutely no experience in manufacturing or sourcing. If I did, then I probably wouldn’t be posting to ask about it on /nostupidquestions

[–] XeroxCool@lemmy.world 1 points 2 days ago

I didn't say you or your question was stupid. I explained why that assumption isn't right