FMC screw-in connector with insulated throat features a built-in nylon lining that proactively shields wires from metal burrs, effectively preventing ground faults and arc faults. It is designed to connect flexible metal conduit (FMC) to electrical boxes, with male threads on one end that screw directly into the conduit’s helical seam without set screws or clamps, while the opposite end threads into a knockout of the box. This design allows quick installation and is suitable for dry locations.