[geuis]

Screws weren't standardized until ww2. And even then, they really haven't been.

Related video for those curious: https://www.youtube.com/watch?v=AKNB04slCUA&t=3s

[nicbou]

The channel Machine Thinking has many videos about screws, and about the early days of machines and precision.

In Europe we have standard screws. Building with only M5 screws is a joy.