Torque When Using Torque Wrench With Extension Tool

If SST or an extension tool is combined with the torque wrench to extend its length, do not tighten the torque wrench to the specified torque values in this article. The actual torque will be excessive.
Use the formula below to calculate special torque values for situations where SST or an extension tool is combined with the torque wrench.

Fig 1: Identifying Length Of Extension Tool And Torque Wrench (1 Of 2)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Formula: T'=T x L2/ (L1 + L2)

TORQUE VALUE FORMULA DESCRIPTION

T'	Reading of torque wrench {N.m (kgf.cm, ft.lbf)}
T	Torque {N.m (kgf.cm, ft.lbf)}
L1	Length of SST or extension tool (cm)
L2	Length of torque wrench (cm)

Fig 2: Identifying Length Of Extension Tool And Torque Wrench (2 Of 2)