Torque Formulas

When using a torque wrench- SST or equivalent combination, the written torque must be recalculated due to the extra length that the SST or equivalent adds to the torque wrench. Recalculate the torque by using the following formulas. Choose the formula that applies to you.

Fig 1: Identifying Torque Wrench
Courtesy of MAZDA MOTORS CORP.

TORQUE FORMULAS

Torque Unit

Formula

N.m

N.m x [⁽²⁾/(⁽²⁾+⁽¹⁾)]

kgf.m

kgf.m x [⁽²⁾/(⁽²⁾+⁽¹⁾)]

kgf.cm

kgf.cm x [⁽²⁾/(⁽²⁾+⁽¹⁾)]

ft.lbf

ft.lbf x [⁽²⁾/(⁽²⁾+⁽¹⁾)]

in.lbf

in.lbf x [⁽²⁾/(⁽²⁾+⁽¹⁾)]

⁽¹⁾	The length of the SST past the torque wrench drive.

⁽²⁾	The length of the torque wrench.