stainless bolts

Unfortunately many stainless manufacturers do not use "ticks". 316 is supposed to be 68pct iron-17pct chromium-12pct nickel. 18-8 uses less nickel (about 8pct) which is why it responds mildly to magnetism. They both carry a tensile strength of aprox. 75,000lbf/sq-in. Which falls between grade 2 and grade 5 carbon steel tensil strength, for the size bolts we deal with in the automotive side. Again just a general guideline. As with everything and like ir3333 was saying, expect a variance between manufacturers. Personally I torque all engine fasteners (exterior) the same as the motors manual torque spec and never had any issues.