... L1 turn 0.25 mm travel375 mm/minTolerance & BacklashTrapezoidal-type screw axial backlash 0.15 mm, radial backlash 0. ... by an external guide rail.Self-locking FunctionRNF Series Trapezoidal type screw is of self-locking. The self-locking function ... system, Sluice gate, Theatre stage, Slitting line, Precision leveler, Powered straightener, Paper machines, Food processing machines, Textiles machines etc.