Hexagons Hexagon head bolts and screws can be used in many different assemblies and applications and are probably the most popular fastener in the world today. The hexagon-shaped head enables a greater torque strength to be applied, so this provides a much stronger fastening which is very useful in some applications.Our range of hexagon screws includes both metric and imperial sizes and we can supply these in different materials according to your needs and applications. Typically plain hexagon screws are used for internal applications as they offer no corrosion resistance and stainless steel or galvanised can be used for external jobs.