In a world where PTC refuses to provide us with an integrated screw thread library, I need a decent reference for standard internal and external screw threads, with tolerances. I expect there are some standard rules for the tolerances, but all of the resources I've found so far omit this information entirely. Right now I'm interested in a 1/2" UNC thread, but I'm looking for a resource that covers the most common thread types, so that I don't have to find another one in the future.
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