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View Full Version : Calibrating a 1/8-27 NPT thread gage

Sujalc
12th May 2009, 12:52 PM
Can anyone tell me how to find the pitch diameter of a 1/8-27 NPT thread gauge.

thanks
SC
Marc
13th May 2009, 07:20 AM
Can anyone help with this?
Jim Wynne
13th May 2009, 12:45 PM
Can anyone tell me how to find the pitch diameter of a 1/8-27 NPT thread gauge.

thanks
SC

NPT threads are tapered, so the PD isn't constant as it is with straight threads. Why do you think you need to know the PD?
Sujalc
13th May 2009, 02:35 PM
I know that a NPT thread is tapered. But in the Machinery's Hand book it says the pitch of a 1/8-27 NPT thread is 0.03704". I was just wondering how to find this. :yes:
Jim Wynne
13th May 2009, 03:22 PM
I know that a NPT thread is tapered. But in the Machinery's Hand book it says the pitch of a 1/8-27 NPT thread is 0.03704". I was just wondering how to find this. :yes:

Have a look at this discussion thread (http://elsmar.com/Forums/showthread.php?p=265325), which might provide some guidance.