Sub Articulo 32.1

You can change the default thickness of \hrulefill by redefining it:
\def\hrulefill{\leavevmode\leaders\hrule height 0.6pt \hfill\kern\z@}
Or you can change the default thickness of \hrule by redefining it as a macro:
\let\TeXhrule\hrule
\def\hrule{\Texhrule height 0.6pt}