Roller and segment rotary threading machines use different kinematics and fit different tools from flat die machines. To deform pieces, they use a central spindle, on which 1 threading roller and 1 segment are assembled on the tool holder. The screw to be threaded is fed between them by means of a feeder slide.

Approximate values. The machine speed can change according to the material used and the type of item to be rolled. Measures in mm.