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A "mil" is 1000th of an inch. 10mils is a very tight tolerance (100th of an inch).



An alternative conclusion is that a mm ("mil") is NOT a 1000th of an inch.

And why would it be ? The milimeter is part of the metric SI system of units. An inch is not "metric" in any way or form.

Wouter

Wouter Hijink
Formula 16 NED 243 (one-off; homebuild)
The Netherlands