These tools have a dial or digital readout and can be a Torque Screwdriver or Torque Wrench design. They enable the operator to read either directly from the dial or readout as the torque is applied.
The torque can be measured as it is applied (Track mode) or the maximum torque value can be recorded (Peak mode).
Three Quality Auditing Tests
Marking Test… used to verify the torque of a previously tightened fastener. This is done by making a clear mark on the surface of the nut, bolt or screw and continuing the mark onto the surface being clamped. This acts as a reference point. The fastener must then be untightened and then retightened until the marks are again in line. The torque value can then be read from the torque tool display.
Just Move Test… used to determine the torque setting of a previously tightened fastener. Using a torque measuring tool, a tightening torque is applied to the fastener until movement is just seen or felt. This torque is deemed to be a good indication of the original torque applied to the fastener.
Break Loose Test… used for checking the torque applied to a previously tightened fastener. Torque is applied in the direction that loosens the fastener, at the point the fastener breaks loose, the torque is recorded. This value is an indication of the torque at which the fastener was originally tightened. This value is typically 20-30% lower than the tightening torque.