I'm working in CREO 2.0 where mate is no longer an option, and coincident doesn't fully constrain the assembly. In WF 5, one could constrain a countersunk screw to a countersunk hole by aligning the cylinder with hole then mate the two countersink surfaces. CREO 2.0 doesn't work the same...no mate.
This doesn't make complete sense to me, but it works and fully constrains the assembly.
coincident cylinders
tangent countersink surfaces
tangent countersink surfaces...again
parallel drive surface...for clocking