On Tue, 07 Dec 2010 16:56:02 -0500, Bob Engelhardt
wrote:

My question is: is mild steel OK to use for a wrench?

Often it is, particularly for special wrenches that don't get a lot of
use and aren't stressed hard when they do get used. I've made a
number of wrenches out of mild steel.


I thought commercial wrenches were some kind of hard alloy.

They are.