An easy rule of thumb that works on just about any size bolt is snug, plus 1/6 turn. Just take the slack out of the assembly so there's no gap between the parts and you can feel a resistance to turning begin, then make a mark beside one corner of the bolt or nut, and advance it until the next corner aligns with the mark. You'll be within a very close tolerance to the reccomended torque setting for the bolt. (Works on lug nuts, too!) It's amazing how badly most people overtorque the wheel bolts on cars and trucks!
Jerry