Hex Bolts are different then hex cap screws as they are hot forged and not cold headed. They also do not have the tight tolerances of hex cap screws but are highly used in the construction industry because of their mechanical properties.
Heavy Hex Bolts are externally threaded, forged fasteners with a six-sided head that is wider than that of a standard hex bolt. They offer a greater wrenching area than standard hex machine bolts. Used mostly in heavy duty industrial applications.