The present invention is directed towards a metal raceway system. The metal raceway system includes a metal raceway and a coupling fitting. The metal raceway snaps onto the coupling fitting to mount the metal raceway to the fitting. The metal raceway has a channel defined by a top wall, side walls and a bottom wall. The side walls include curved protrusions that extend below the channel. The coupling fitting has a base with at least one retention flange having a curved profile that engages the metal raceway.