Maybe old news.... But I finally found a tool that calculates torque for unequal material combinations, e.g. stainless bolt in aluminum thread or Grade 8 in 4340 alloy steel. American or metric thread, dry or lubed:
http://www.futek.com/boltcalc.aspx?mode=metric
http://www.futek.com/boltcalc.aspx?mode=metric
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