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drill size for tap? 

 

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 Post subject: drill size for tap?
Posted: Tue Nov 27, 2007 10:27 pm 
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i want to tap a 3/16npt into my turbo housing... what size drill bit do i need?
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Posted: Tue Nov 27, 2007 10:55 pm 
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3/16 works out to about 4.7 mm so I'd be saying a 3.7 (make it a 3.5 and give it a slight ream).

Probable better using a 3.5 as it is a tapered thread too, I'd be saying you'd be using thread tape of some sort??

 

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Posted: Wed Nov 28, 2007 12:25 am 
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is there such thing 3/16 npt??

 

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Posted: Wed Nov 28, 2007 8:25 pm 
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yeah thats what i was thinking. if there is its extremely uncommon

 

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Posted: Wed Nov 28, 2007 8:44 pm 
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ebs_4l wrote:
is there such thing 3/16 npt??


Yes, pipe threads, tapered.
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Posted: Wed Nov 28, 2007 11:27 pm 
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ELGT wrote:
Yes, pipe threads, tapered.

oh, really... i understand npt, that wasnt my question....

my question was, is there such thing as 3/16 npt??

 

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