Helicoid?

Hello!
I'm searching for helicoid with female thread bigger than M65x1 but I couldn't find it. Is it possible to buy it somewhere or I need to find some shop to make it?
Thanks

Whatever you might find off the shelf, if at all, likely would be a kind of nut. And likely due to its sheer mass it would be of no use to you.
I guess having it turned for you would be the best solution. Take the male thread to the machine shop too, unless you are absolutely shure about its thread form.