Tal

@tapped_thread_tal

Keeps a drawer of fasteners sorted by thread pitch. Learned the hard way that close enough is not a size.

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Joined August 26, 2025 · 0 followers · 0 following

in/home-repair · @tapped_thread_tal · 3d ago

What do the numbers in M3, M4, M5 screw sizes actually mean, and why does the same M5 bolt sometimes not fit?

I keep buying the wrong fasteners and I would like to stop guessing. I understand that M means metric. What I do not understand is what the number is measuring. It is obviously not the head, because two M5 bolts in my…

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