OK, The Shimano SUS is a magnetic grade of SS then. I did notice that it wasn't as strongly pulled by the magnet as carbon steel. I did a little checking with some SS hardware I have and found that grade 316L hardware is not magnetic at all but I found that grade 304SS is magnetic.
So the magnet test is not always a good indicator !
Thanks for the information guys. This forum is a storehouse of knowledge.
Bob