Clamp Force Control in Action!

Featured Product from DEPRAG, Inc.

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Constant clamp force despite fluctuating tightening torques

Adaptive screwdriving procedure ensures a constant clamp force when drive-in torque values are fluctuating. The whole screw assembly consists of the head contact recognition and a screw assembly to differential torque or a specific angle.

A typical area of application is direct screwdriving into plastic and or metal. The patented screwdriving procedure for DEPRAG EC servo screwdrivers, in combination with the AST40, is used for greatly varying tightening torques.

these fluctuations may result from alterations in the geometry of the screws and hole, the component’s material structure, variations in the surface quality of the screw thread, the elasticity of elements or seating processes. The reliable recognition of head contact results in a constant clamp force.


  • Improved constancy of the pre-load force
  • The calculation takes into account coincidental fluctuations in the torque during
  • the process, which is not caused by head contact
  • Minimal parameter adjustments

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