For the crank, all the load is on the mounting bolts even if the hole for the crank does not touch the shoulder of the crank at all.
The load will be some combination of shear at the joint-line between the crank and the spider, and tension from the nut.
The tension (if the nut is done up proper) should be sufficient to make the two pieces stick together under almost any cycling situation, so the shear load is zero or close to it.
In sum, don't worry.
Make sure you have a decent spanner for the bolts; if using a box-spanner or socket, grind the face flat so it grips the whole of the tiny flats on the nuts and bolts.