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Discussion Starter · #1 ·
Just a quick question my brother had...

What size drill bit would he use if he wanted to drill a hole for a 1/2" NPT fitting? He assumed it would be a 1/2", but doesn't think you would be able to thread it and still have it fit...

Any idea?


-Matt :smilejap:
 

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7/16ths or 15/32nds. One step smaller. If you go a little too small it's ok the tap can open it up a little more.
 

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Oh whoops forgot pipe sizes are inside diameter :(
 
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