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(lemmy.world)
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this post was submitted on 03 Aug 2023
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Again, all standards ( gauge blocks and the like) are all calibrated from a metric standard.
This is due to how Carl Evard Johansson made them.
You might be using the SAE standard, but that is referenced to the SI standard which is what metric became.
You're confusing Metrology Calibrations/Traceability with standards for industry quality.
And just because the inch unit is derived from a SI unit it doesn't mean an M12x1.25 bolt will be a functional replacement in a 1/2-20 thread.
There's more to the inch/metric debate than your focus on academia...