Originally Posted by Troux

I can't read this. You want an M10, and I'm guessing 7.5" long? You're going to need a length in mm. You'll also likely want to specify the thread pitch. What is pitch depth? I think you said 2.5 inches, which will also need to be in mm, so I assume you mean the threaded length, leaving a 5" shank?

Here's a M10x1.5 x 190. According to their standard, it looks like the threaded length is only going to be 1.25", not the 2.5 you asked for, however, you can probably have them just run a die down it to thread another 1.25" of the shank, or do the same thing locally if they won't do it.
Metric hex bolts, Metric standard bolts, Stainless A-2 (18-