# Residual Torque / Peak

This strategy evaluates the residual torque on a joint as the peak torque necessary to rotate the screw further.

Parameter | Description
--- | ---
Required tag number | A specific number must be written in the TAG of the end fitting tool.
Name | Name of the tightening program.
Program start | Torque value from which the tightening operation starts. Must be ≥ smartHEAD Min torque value. If Program start = 0, its value is automatically set to the smartHEAD Min torque value.
Torque min | Lower torque limit.
Torque max | Higher torque limit.
Maximum torque limit | If the torque applied reaches this limit, the message Change screw is shown on the wrench display. Must be > Torque max.
Target torque | The torque target.
Trigger torque | Torque value from which the angle measurement starts (usually set to 50% of the Target torque). If Trigger torque = 0, its value is automatically set to the smartHEAD Min torque value.
Angle min | Lower angle limit.
Angle max | Higher angle limit.
Target angle | The angle target.
Torque units | This parameter is not editable.
Angle limit for rehit | If the Torque min value is reached within the specified angle, the message Joint already tightened is shown on the wrench display.
Stop condition | Select between Torque peak and Angle peak.
Torque correction coefficient | When extensions are used, the wrench measurement might be compensated to show a more accurate torque value. To calculate the correction coefficient, please refer to How to calculate the Torque Correction Coefficient. The parameter is stored in the RFID TAG of the end fitting tool. When extensions are not used, Torque correction coefficient = 1.
Angle correction | When extensions cause additional wrench bending, the wrench angle measurement can be compensated to show a more accurate angle value. To calculate the correction value, please refer to How to Calculate the Angle Correction. The parameter is stored in the RFID TAG of the end fitting tool. When extensions are not used, Angle correction = 0.
Batch size | Number of tightenings the batch will perform. Maximum value: 99. If Batch size = 0, the number of tightenings is infinite. If Batch size > 1, batch result OK only if all tightenings are OK.
Max consecutive NOK | Number of accepted consecutive NOK to have an OK result.
End cycle time | Starts when the torque goes below the Program start after reaching the 3rd percentage. Default value: 0.1 sec. Minimum value: 0.1 sec. Maximum value: 5 sec.
Ratchet time | Starts when the torque goes below the Program start without reaching the 3rd percentage value. This allows the operator to release the torque for a while and recharge during the tightening operation. Default value: 5 sec. Minimum value: 0.1 sec. Maximum value: 30 sec.

With this strategy, the breakaway point is not detected automatically. Therefore, this is a less objective method of evaluating residual torque. It may be used when the residual torque/time or torque/angle methods cannot be performed.

Torque vs Time

A | Torque min | B | Torque max
C | Torque peak |  |

Specify the torque limits in order to get a result “OK”.

If the Target angle value is not specified, the angle result is marked as Not Applicable.

If a Target angle value is specified, the residual torque result is measured at the specified angle (starting from the Trigger torque) instead of the peak torque:

Torque vs Angle

A | Torque min | B | Torque max
C | Target angle |  |