If you do anything with threads including tapping, forming, or single-pointing, you may appreciate the thread calculator located here...
UN imperial screw thread calculator
Put in the basic thread description - major diameter, pitch, series and class - hit the "calculate" button and every conceivable characteristic of the thread appears on the right.
While you're on the page, be sure to checkout the drop down menus entitled "calculators" and "popup charts" for even more valuable thread-related information.
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