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Dear sir,
Please sugest me, size of drilling/turning(max ID, Min ID and length)for making the TAPS 3/8", 1/2", 1" and 2" (internal)
Thanking You
Roshi
This info is in your Machinery's Handbook.
Here's the information you're looking for, but pay attention to this site overall. It's got just a lot of really good info.
http://www.engineershandbook.com/Tables/npttap.htm