Mil To Mm Conversion
Convert thickness or length from mils (thousandths of an inch) to millimeters.
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Imperial vs. Metric Precision
Defining the Units
Mil (Thou): A unit in the imperial system equal to one-thousandth of an inch (0.001"). It's a common unit for specifying thickness and tolerance in US manufacturing. It is crucial not to confuse "mil" with "millimeter."
Millimeter (mm): A standard unit of length in the metric system, equal to one-thousandth of a meter. It is used globally for nearly all scientific and engineering applications.
The Conversion Formula
The conversion is derived from the exact definition of an inch:
- 1 inch = 25.4 millimeters (exactly)
- 1 mil = 0.001 inches
Therefore, the conversion factor is:
Millimeters = Mils × 0.0254
Mils = Millimeters / 0.0254
Practical Example
Suppose a US engineering drawing specifies a coating thickness of 5 mils. A European manufacturer needs to know this value in millimeters.
Using the calculator, you would find:
5 mils × 0.0254 = 0.127 mm
This quick conversion ensures that both parties are working with the same specification, preventing costly errors in production. This tool is indispensable for anyone working in international manufacturing, engineering, or 3D printing.
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