Half inch UNC nut and bolt

This is a half-inch UNC nut and bolt I made with OpenSCAD, using a twist extrusion. It's not an exact trapezoidal thread per the UNC spec, it's a smooth helical thread using minimal source code. I spend some time adjusting the dimensions so it will fit on a “real” bolt, such as the half-inch threaded rod common in North America. I later found a more accurate bolt in the BOSL library that's less “elegant”, but takes less time to render.