An inch was defined to be equivalent to exactly 25.4 millimeters in 1959. There ... How to Convert Inch to Millimeter. 1 in = 25.4 mm 1 mm = 0.0393700787 in.
1 ÷ 8 × 25.4 = 3.175 mm 0.125 × 25.4 = 3.175 mm. To convert 1/8 inch to mm, divide 1 by 8 to convert the fraction to a decimal. Then, multiply that by 25.4...
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