Hex head screws are easy to install with a wrench for a secure hold. Use them with a nut or in tapped holes.

Unlike screws that hold materials together with threads, set screws exert pressure at the tip to hold objects in place.

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.

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

Used on heavy equipment, such as plows, these bolts have a smooth head that's angled underneath to sit flush within countersunk holes. The square neck keeps these bolts from turning when tightening a nut.