The screw testing machine assumes a special place among the torsion testing units. There are several standards which govern testing for screws, bolts, nuts and threaded studs; of particular importance are the automotive and aircraft industry standards.

The TesT  screw testing machines comply fully with these standards.

These units measure and evaluate the following parameters :

  • Pre load at the threaded connection
    		•
  • Overall tightening torque
    		•
  • Overall loosening torque
    		•
  • Friction torque underneath the screw head
    		•
  • Thread friction torque
    		•
  • Angle
    		•
  • Stretch
    		•

    TesT torsion testing machines are constructed according to the following principle:

    Motor Safety cage Testhead
    Schema
    Frame, stable base construction

    Modell 205
    Model 205

    To master this application TesT  has developed a special multi-component sensor, Model 201, as the measurement transducer for these screw testing machines; patent protection has been applied for.

    To enable simultaneous, online measurement and processing for all these parameters, special plug-in PC cards Models 840 (WIN 95, 98, ME, NT, 2000) and the associated software SoftWinner 940 (WIN 95, 98, ME, NT, 2000).

    These cards and the software correspond in principle to those for the universal testing machines but they have been expanded by adding the functions and evaluation routines needed for screw testing.

    Model 205 Model 205