Machinery's handbook ($100 new) is an excellent source of this kind of info.
A used copy thru Bibliofind.com would be much cheaper.
What thread sizes are you interested in? I could just look them up for you.
> Mark Johnson wrote:
> > Barry
> > try www.fastenal.com
> > I believe they have all kinds of stuff there.
> > "Barry H. Welliver" wrote:
> > > Where can I find information about threaded rods less than 1/4"
> > > diameter? Specifically, root diameter or net section etc.
> > >
> > > Barry H. Welliver