NPT tread question

Belgian1979vette

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Joined
Apr 4, 2008
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Koersel/Belgium
OK, I need to tap some NPT treads. I would like to know if I would have to use a reamer first or can I just tap the drilled hole straight with the tap. If so what reamer would be a good one (size, angle etc).

Also, any good, reliable and not to expensive suppliers in the US. For these taps they charge me an arm and a leg here.
 
What size tap do you need and do you need it fast????
 
Doesn't even have to be super precise on the drill, since it's a taper it will also thread fine if you have it a little too large. I always eyeball the drill sizes for NPT (and all the other non critical fasteners BTW)
 
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