V ? Most threaded rod is a V.

I think you wanted the square based thread used on lathes and mills.
A flat end screw rides in it or a half nut clamps on them.

Either a square thread or an Acme screw thread (most common).

http://www.techno-isel.com/LMC/Products.htm#SCREWS

MSCdirect also has screws.

On 12/2/2011 10:47 AM, Jon Anderson wrote:
Had a brochure years ago for a company that made worm wheels cut to use
standard threaded rod for the worm. Can't find it now. I might well end
up making my own, but at least want to see (if they're still around)
what an off the shelf worm wheel would cost.

Anyone run across, and remember the name of this outfit?


Jon