phillip wrote:

If a person were to thread a tube with threads half of the wall
thickness, does the tension, bending, torsion strength drop in half as
well?

I'm wondering how to figure the loss in strength from threading a tube.

Phil Williamson
Oregon City Or.

Yes. 
However much worse than that. You now have a bunch of built in cracks. 
If there are any sort of cyclical loads it is almost guaranteed to fail.
 
Paul Lamar
 
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