Mandrel M8-1.25 Thread Size for RN-1 Tool

Steel threaded mandrel M8-1.25 designed specifically for the RN-1 / 39300 rivet nut setter tool. Used to install M8 × 1.25 rivet nuts, this part provides exact thread engagement for proper nut insertion into materials where backside access may be limited. Ideal as a replacement mandrel for metric rivet nut work in sheet metal, repair, or fabrication settings.