Quote Originally Posted by metric_taper View Post
I'm with you Marv, on the simplicity of metric threads.
But any measurement system we have, has no absolute base reference. A millimeter, or inch are just random chosen lengths, and turned into a human standard.
Of course and that's why the oft-heard anti-metric argument that it's "inaccurate" is so stupid. There is no such thing as accuracy of a measurement system; they're all based on some arbitrary standards and their measure is how they express and subdivide those standards.

Regardless, 0.323" isn't very close to 8 mm, even if the chart was made up before the inch was set at 25.4 mm.