To convert inches to mm you need to multiply the value in mm by 25.4 as there are this many millimeters in an inch. ... 1/2 inch to mm = 12.7mm. 3/4 inch to...
There are 12.7 millimeters in 1/2 inch. An inch (in.) is part of the US customary system of measurement, whereas a millimeter (mm.) is part of the SI metric
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