I've been browsing some of the links on the Online Metals site (http://www.onlinemetals.com) in the MSOG links) and found this white paper on SS grades. More than you want to know:

http://www.sppusa.com/reference/white_paper/wp_ss.html

Also, here's info on galvanic response. Find the difference between the two metals' anodic index (listed) and if it's not more than .15 (for outdoor and salt environments), bolt 'em together:

http://www.engineersedge.com/galvanic_capatability.htm

Bunch of other neat stuff at the Engineer's Edge, home page at http://www.engineersedge.com/

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Doug King
M-17 #404 "Vixen"

Montgomery Sailboats Owners Group Web site: http://msog.org
Email: mailto:msog@msog.org