Large flat sides make these screws easy to grip with a wrench and keep them from rotating in square holes.

Commonly used in tight spaces with moving parts, such as grain elevators and other belting systems, elevator bolts have a smooth, low-profile head that provides a flush fit when installed. The neck shape keeps them from turning when tightening a nut.

The head makes 12 points of contact with a wrench to handle more torque than a socket head or hex head screw.