Common stainless steel alloy fasteners such as 304SS / 316SS are bad for galling, essentially the metal on metal micro welds itself on same grades,
but to some degree using different grades the effect can be reduced. Not great in strength either but there are stainless alloy grades that could possibly be made and in some cases heat treated. In regular steel fasteners 4.6, 8.8, 10.9 and 12.9 are grades of strength - 8.8 with zinc coating should be fine. Torque wrench is good as well as either locktite, spring washers or antiseize pending application. Lots of older jap cars seem to use a lot of 8.8 zinc plated with one size finer thread than the std coarse and use a smaller metric head size rather than imperial. Theres a lot more to all this but thats a start anyway, hope its of some use :P