Notes on calculating tightening torque when using insertion tool with various effective lengths. - AH00.00-P-0015-01CW

The working length of the insertion tool (2) plugged onto the torque wrench (1) changes the leverage of the torque wrench (1). This in turn alters the actual tightening torque. Therefore the tightening torque to be set has to be calculated as a function of the working length of the insertion tool (2) and the specified tightening torque.

Fig 1: Identifying Working Length Of Torque Wrench, Insertion Tool And Adjusting Tool

Courtesy of MERCEDES-BENZ USA

The following formula is used to calculate the torque to be set. 

Fig 2: Formula To Calculate Torque To Be Set

Courtesy of MERCEDES-BENZ USA