Reference for Taping NPT threads

[socoj2]

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

[SpudMonster]

Your Google-Fu is weak grasshopper.

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

[grumpy]

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/

[MrCrowley]

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

[grumpy]

so it does, i didn't see see that. must remember to clone a new braincell

[jrrdw]

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.