Blender360’s Jose Garcia shows an easy method for creating a Hardware Fastening Nut or a Screw Head in Blender while leaving the ability to control the number of polygons flexible.
…In this video I show a simple way to make a nut or a screw head- With just a few modifications…
Jose also posts the counterpart to the Blender modeling tutorial where he continues work on the Nut to develop materials in Blender for the metallic surface.
http://blender360.blogspot.ca/2012/08/model-single-nut-with-blender-video.html