12.7 mm
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1/2 inch = 12.7 millimeters.
(1/2) inch = 12.7 millimeters.Direct Conversion Formula 0.5 in*25.4 mm1 in=12.7 mm
There are 25.4 millimeters in an inch.
Half an inch is equal to 12.7 millimeters.
There are 25.4 mm per inch, so (5 inches) * (25.4 mm / 1 inch) = 127 mm.