Screws are inserted via torque applied--in a clockwise manner--to the head with a screw drive. Since the terms "bolt" and ... Lag screws are self-tapping screws that meant to be applied with a wrench ...
These are also called stripper bolts ... types of screw head drive. This enables torque to be applied to the machine screw to be rotated around its thread and into a tapped hole. Shoulder screws are ...