Fully threaded screws can withstand much higher forces acting along the screw axis because the load is held by the longer thread. The longer thread also increases shear capacities due to the rope effect.
Steel to wood and also applications between timber members are common. RAPID® screws have very high withdrawal capacities through axial loading and can be used for installation angles from 90° (side grain) to 0°, driven into end grain. Many applications are possible, e.g. reinforcement in tension, shear and also in compression, cost efficient solutions with crosswise paired screws or even arranged under 45° connections.