Abstract: An annular thread cutting die head for a power driven threading machine is comprised of an annular support plate assembly supporting a plurality of radially displaceable threading cutting dies spaced apart about the axis of the die head, and a cam plate assembly coaxial with and pivotal relative to the support plate assembly to radially displace the cutting dies. The cam plate assembly is spring biased to pivot relative to the support plate assembly in the direction to radially retract the cutting dies, and pivoting in the latter direction is controlled by a keeper mounted on the support plate assembly and engaging a keeper track on the cam plate assembly.