Custom Hardware  

If the
shop can produce what you want in brass -- this is a good base material ofr such pieces. Much cabinet hardware is plated brass. Get the texture that you want on the brass (smooth, brushed, etc) then have it plated as a second step, at a different facility.
Good luck.

what is in in particular
that you need?

This is
an image I made to illustrate the piece I'm am looking for. I wish to find the curved part extant and not be required to have the silly thing made. The specifications given are desired, but not critical; some variation from these may be tolerable. The tapped hole is needed only at one end as the other will be welded to a flat bar.
I have looked at a number of hardware dealers online, but I have yet to discover anything quite like this.
Thanks for any ideas! ~ David

Ahh...
Thanks, SDR, for that suggestion about having it made in brass and then plated. This would make things a lot simpler indeed!

how many
do you need?

How many will I need?
Haha, many, I hope. To begin with however, I will need only 4 per unit. (low table) And this is a proto-type, so the answer is four.

well
here is how i see it. i have a very capable welder that could do that job, but imo, he is an anomaly.
a machine shop is geared towards higher volume, and normally doesn't have equipment to bend wire rod. i could be wrong though. maybe they have something that can do it.
better than a machine shop is a sheet metal fabricator.
a wire fabricator would have the gear to make the radius, but might not like stainless, or drilling/tapping the end.
you could try a wrought iron fence fabricator, but they also might not be able to deal with the stainless.

do you still need to make...
do you still need to make the prototype? Maybe I can help you.

Yes, I still will need them,
I'm just not sure when. I am not to that stage in the project yet, I am just trying to gather resources in advance. One approach I have thought of was to locate some extant ring, and cut the 90 out of it, but I can't find anything like this either! I have looked at a 12 ton pipe bender which accepts up a 2 inch diameter pipe, but I don't know it this enough to bend even 3/4 inch dia. solid stainless rod.
So as you can see, I am still at a bit of a loss here. How exactly might you help me Xela? As I said, I'm not ready, but please tell me what's on your mind.
Thanks! ~ David

If your quantities is only...
If your quantities is only 4pcs, I suggest you to make with CNC milling machine. What is function of the threaded end? I think around 25mm deep could be drilled on the hole. Please consider any force apllication the end.
Regards,
Xela