How to calculate a 3.5" NPT - CNCzone.com-The Largest Machinist Community on the net!

Loading · #1 04-25-2008, 07:33 PM

I've got to turn a 3.5" NPT internal thread. I know I need to turn a taper of 3/4 inch per foot which is no problem (That's works out to an angle of what, 1.877 degrees)

I'm not really sure what to turn the ID bore to. Do I turn it to an ID of 4" and taper in? Or would that only be for an OD thread? How do I figure out how deep to take the threading? If anyone could show me how to calculate these that'd be appreciated so then I can do this in the future.

Thanks!

ctate2000 · #2 04-26-2008, 08:26 PM

Go to Machinery's Handbook (AKA The Bible). There you will find the information you seek. If I remember I will post it Monday. My handbook is at work.

gridley51 · #3 04-27-2008, 02:41 AM

Stellram have a nice download on their site which gives all the parameters for this.
Mark.

cam1 · #4 04-27-2008, 02:06 PM

Try this: I compiled this info from the Machinery Handbook

regards

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