Inch threaded hole is 3/8" in 3D, but 5/8" in 2D dimension?

• Nov 19, 2015

• #2

JohnRBaker

Mechanical

Jun 1, 2006

35,722

What version of NX are you using?

John R. Baker, P.E.
Product 'Evangelist'
Product Engineering Software
Siemens PLM Software Inc.
Digital Factory
Cypress, CA
Siemens PLM:
UG/NX Museum:

To an Engineer, the glass is twice as big as it needs to be.

 

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• Nov 19, 2015

• Thread starter
• #3

mag00

Mechanical

Mar 18, 2004

45

This is 7.5...

Gerson Fioravanti Junior
Mechanical Production Engineer

 

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• Nov 19, 2015

• #4

jerry1423

Mechanical

Aug 19, 2005

3,428

So you are using a pipe thread here ?

 

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• Nov 19, 2015

• Thread starter
• #5

mag00

Mechanical

Mar 18, 2004

45

Yes. This is a pipe thread.

Gerson Fioravanti Junior
Mechanical Production Engineer

 

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• Nov 19, 2015

• #6

jerry1423

Mechanical

Aug 19, 2005

3,428

The outside dimension for a 3/8" pipe thread is .675"

 

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• Nov 19, 2015

• #7

JohnRBaker

Mechanical

Jun 1, 2006

35,722

How are you annotating it on your Drawing? After all, a 3/8 NPT is nearly 0.6 inches in diameter so unless you're using the proper feature-based annotation scheme, you're probably NOT getting the proper designation.

BTW, you should really update to at least NX 9.0 where we've made the proper annotation of any sort of hole, threaded or otherwise, including pipe-threads, much easier and straight forward.

John R. Baker, P.E.
Product 'Evangelist'
Product Engineering Software
Siemens PLM Software Inc.
Digital Factory
Cypress, CA
Siemens PLM:
UG/NX Museum:

To an Engineer, the glass is twice as big as it needs to be.

 

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• Nov 19, 2015

• Thread starter
• #8

mag00

Mechanical

Mar 18, 2004

45

I was wondering that I could dimension it as a fraction. I don't want it as a decimal inch format.

In decimal inch format the dimension is OK.

About NX version, the company should update our software in a few days to NX 9. Until there I just have 7.5 available.

Gerson Fioravanti Junior
Mechanical Production Engineer

 

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• Nov 19, 2015

• #9

JohnRBaker

Mechanical

Jun 1, 2006

35,722

You don't 'dimension' pipe threads. You call-out the size such as '3/8-NPT' using an annotation as shown below using two different formats created with the new Hole Call-out capabilities added in NX 9.0:

John R. Baker, P.E.
Product 'Evangelist'
Product Engineering Software
Siemens PLM Software Inc.
Digital Factory
Cypress, CA
Siemens PLM:
UG/NX Museum:

To an Engineer, the glass is twice as big as it needs to be.

 

Upvote 0 Downvote

• Nov 23, 2015

• Thread starter
• #10

mag00

Mechanical

Mar 18, 2004

45

OK. Understood.

Lets see what NX9 can do for me.

Many thanks for all.

Gerson Fioravanti Junior
Mechanical Production Engineer

 

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