The CamOut effect is a common problem with conventional, conical profiles, such as the cross-recessed Phillips profile. In accordance with the triangle of forces, some of the energy cams out of the screw ("cam-out effect") causing the screwdriver or bit to slip out of the screw head. The user has to counteract this cam-out effect by an additional application of force.
Since the tool (e.g. slotted profile) tends to slip, this can cause injury to the user or damage to the surface of the work piece, for example the paintwork.A special surface coating on the tool tip (Wiha Dura, Wiha Diamond) can remarkably reduce the cam-out forces. This cam-out effect does not occur with profiles with straight side walls, such as Hex, TORX® or TORX PLUS®.