Its generally down the airframe makers spec.
Bolts being far stronger in shear than in tension could lead you to thinking the bolts spec for torque would allways be correct, but in aircraft use they are usually over-speced for fatigue life and tightening to the bolts to its recomended torque 'could' lead to crushing of the componant
In short, go by what your aircraft maker says, not a chart of bolt spec