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Reference for Taping NPT threads

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Reference for Taping NPT threads

Unread postAuthor: socoj2 » Sun Jan 06, 2008 4:57 pm

Have you guys found a reference for what size drill bit to use, when tapping threads for different NPT sizes..

1/8
1/4
3/8
1/2
3/4
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Unread postAuthor: SpudMonster » Sun Jan 06, 2008 5:00 pm

Your Google-Fu is weak grasshopper.

http://www.korit.com/tapndrill.htm
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Unread postAuthor: grumpy » Sun Jan 06, 2008 5:12 pm

SpudMonster wrote:Your Google-Fu is weak grasshopper.

http://www.korit.com/tapndrill.htm


sorry young padiwan but your google-force is weak also
that chart does not cover npt threads, try this one.
http://www.dentsport.com/gallery/v/dsg/tech/thread/
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Unread postAuthor: MrCrowley » Sun Jan 06, 2008 5:19 pm

grumpy wrote:
SpudMonster wrote:Your Google-Fu is weak grasshopper.

http://www.korit.com/tapndrill.htm


sorry young padiwan but your google-force is weak also
that chart does not cover npt threads, try this one.
http://www.dentsport.com/gallery/v/dsg/tech/thread/


It does, check the bottom of the page :wink:
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Unread postAuthor: grumpy » Sun Jan 06, 2008 5:40 pm

so it does, i didn't see see that. must remember to clone a new braincell :)
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Unread postAuthor: jrrdw » Sun Jan 06, 2008 6:08 pm

Tapered drill bits/reamers work better. Once you get near the back of the pipe tap, they get real hard to turn in, if your tapping a straight hole.
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