The Answer:

We here at Infoplease.com like to get our hands dirty every once in a while. So it's no coincidence that we have what you're looking for. Here is a link to a chart of ours called Bolts and Screws: Conversion from Fractions of an Inch to Millimeters.

If there is some other measurement conversion you are wondering about, just visit our Weights and Measures channel.

—The Editors