Ned Simmons wrote:
On Sun, 22 Mar 2009 16:52:56 -0400, Errol Groff
wrote:

Two of my students are building model hit and miss engines. The
drawing calls for stainless steel for the connecting rods but does not
specify what grade. The part will be made from .4375 diameter rod
stock.

Suggestions please on what grade to use keeping in mind that they have
no experience with S.S. so machinability is important. Will probably
order the stock from Mc Master Carr and they list a bewildering
variety of grades.

As long as there's no welding involved, type 303.

Why no welding?
Never had a problem tigging 303.

cheers
T.Alan