With a deeper drive than flat and rounded head screws, socket head screws withstand more torque for a tighter hold. Install in a counterbored hole or above the surface.

Flat and oval head screws are angled under the head to fit in countersunk holes.

Carriage bolts have a smooth, rounded head for a finished look. The neck shape keeps them from turning when tightening a nut.

While other screws and bolts require holes with threads, tapping screws create their own threads.