Autodesk Inventor

[#1]

I'd like to use an "NPT" Hole Dialog thread but it doesn't show up in the Thread type list.

But it does show up in the Thread Dialog/Specifications Tab/ Thread type list so it's available.

I definitely have "NPT" in my Thread.xls & I have my Options/Files set to point to the correct Design Data folder.

See 3 screen shots attached.

Anybody have ideas what's wrong & how to fix? Thanks.

Gary

[#2]

What is this I don't have this I do have NPT but not IPT.

Here is mine Thread

Here is my hole

[#3]

LOL I see now you have to pick taper Tapped thread option in your hole dialog

[#4 · Accepted solution]

When I went back to look at you jpg I see you did not have this picked by what threads it was showing is how I noticed.

[#5]

jletcher,

The IPT is a specialized thread used in the lighting industry. Those threaded pipes that go into table lamps use it. For example 1/8 IPS is actually same as 3/8-27 thread. It's based on pipe somehow but it still is not intuitive at all.

I was looking for the NPT thread for an electrical conduit nut part. It's definitely not a tapered thread on standard hardware store EMT electrical fittings. So that's why I didn't think to pick the tapered icon in the hole dialog. Guess it's just one of those trade specific threads for the electrical industry.

3/8 NPT

1/2 NPT etc.

In catalogs they just call it 1/2 or 3/8 without any letters.

US trade thread designations are as non intuitive as lumber designations!

Thanks for the help.

Gary

[#6]

NPT is always tapered. If it's not tapered, it's not NPT.

[#7]

FYI: http://pipeandhose.com/node/19