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Following up from my earlier post, I just received word back from Tormek Support re the metal used in the universal support:

"It is not stainless steel.
It is made of construction steel SS2172.(Fe490) (A 570 Gr. 50)"

I do like your design and the method of construction.  Am I right in thinking that it's made of 303 stainless steel rod?

I will send a question to Tormek to ask about the metal(s) used in the universal support.  Thanks for the suggestion.  I'll be interested to hear what they say.

Here's my reason for asking.

Making an extension went more smoothly than I expected.  I turned a .5" rod on a metalworking lathe, drilled and tapped the end with the M6 tap, threaded the M6 threaded rod into the .5" rod, reverse-chucked the .5" rod with the threads held in the three-jaw chuck so that the .5" rod could be turned concentric around the threads, and reduced the rod to the exact diameter of the universal support.  The extension fits perfectly, and all the Tormek components slide nicely across the coupling. 

Now that I know that this modification works, I'd like to upgrade to the same metal rod as the universal support.  Question: what metal is the universal support arm made of?

Thanks for your help.

What kind of metal rod did you use?

Great -- thanks a lot for your help.  Much appreciated.

I'd like to machine an extension to the US-105 Universal Support bar, linking to the internal thread in the US-105 bar.  I can't seem to locate any specs for the US-105 that give the thread size.  I realize that other Tomek bolts-with-knobs fit, but I can't seem to locate their thread size either.

Thanks for helping a newbie to this forum,
Don