Thread: Drill and Tap question
11-17-2006, 10:55 AM #1
Drill and Tap question
I just ordered a 1/4 inch NPT tap so I can thread my I/C blockoff for the boost guage. My question is, what size drill bit should I use to make the initial hole? These thread sizes confuse my feeble little mind as 1/4 npt, is 1/2 inch if measured from one side to the other. Thanks in advance
11-17-2006, 11:39 AM #2
Most taps say right on the shank what size bit to use.
It should be a 7/16 drill.
Last edited by R-Doo; 11-17-2006 at 11:46 AM. Reason: size matters
11-17-2006, 03:03 PM #3
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