"Errol Groff" wrote in message
...

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.

Thanks,

Errol Groff

If there is no spec for type, use 303. It's like the 12L14 of SS.
"303, she's for me. 304, she's a whore."

416 is fair to machine also if you need that series for heat treating, but
303 has been my favorite for machinability.
Tom