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[mrunclesocio]

here is the outside diameter and equivalent npt size chart

A allen head pipe plug here:

[Bulldoser89]

This is good information

[mrunclesocio]

especially since the nominal size is smaller than the actual physical size.

Pipe thread is a tapered thread-the top of the hole is larger but tapers smaller as it goes deeper. This ensures sealing. I think it doesn't work if the threads go completely through the hole.
Happened to me on some of my stuff and them pretty Fore Performance fuel rails had an issue like that.

[judaspriess]

especially since the nominal size is smaller than the actual physical size.

Pipe thread is a tapered thread-the top of the hole is larger but tapers smaller as it goes deeper. This ensures sealing. I think it doesn't work if the threads go completely through the hole.
Happened to me on some of my stuff and them pretty Fore Performance fuel rails had an issue like that.

Please don't remind me.... the rails look good, but what a PITA....

[mrunclesocio]

Oops! Never have the right mind when I first saw your response.


OOOOOPS! SORRY!

[mark_andrews]

Nice post although I read it late. Good information man. I just wondering if I can also use this for a front pipe I'm assembling right now. Thanks for this anyway.