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Anti Backlash 25kN – 200kN (Metric)

Anti Backlash Overview

Anti-backlash actuators reduce
linear backlash resulting in smooth, precise operation and
minimal wear. Backlash occurs when the motor driving an
actuator reverses its load direction or alternatively a load imposed on
the lifting screw changes direction -i.e. – load changing from
compression to tension. Since there is a gap between the lifting
screw and the worm gear threads detrimental screw movement may

When the anti backlash screw jack is under
load, the lifting screw threads are supported by the worm
gears threads. The anti-backlash nut, being pinned by to the worm gear
and being adjusted downwards by the shell cap, forces the
bottom thread surfaces against the upper thread surfaces of
the lifting screw. Thus backlash between the lifting screw
and worm gear threads is reduced to a minimum.

Key Features

  • Duff Norton Anti-backlash Screw Jack design features a separate anti-backlash nut and
    reduces actuator backlash to less than 0.025mm
  • Anti-backlash nuts act as additional load safety devices when the worm gear has become worn
  • Anti-backlash nuts reduce worm gear wear
  • Precise Motion Control
  • Available in Stainless Steel