I have to agree, with the above 2 posts, a 4" angle grinder does a pretty good job of cutting threaded rod and a lot of other things, I might add.
However,
I've lost count of the number of times I've seen people on a building site, using a grinding wheel as a cut-off blade and vice-versa and they wonder why the wheels don't last long, or even worse, they shatter.
Cut-off wheels are not designed to have side-ways force applied to them, as they are quite thin.
