Tool - Torque Wrench Extension Formulas
100-03DATE
2/97
XK8
MODEL
1997 MY-ON
XKB Range
VIN
001001-ON
Torque Wrench - Using with Extensions
Issue:
Some workshop procedures require the use of an extension on a torque wrench to allow access for tightening a fastener. Using an extension in line with the handle of the torque wrench increases the leverage and therefore the torque applied to the fastener over the setting of the torque wrench.
When an extension is used that changes the distance from the center of the handle to center of the fastener (dimension A), a correction must be made to the torque wrench setting. The three types of extensions with the corresponding dimension for the increased length (dimension B) are shown in Illustration 1.
The formula for determining the torque setting when an extension is used is as shown:
EXAMPLE AS SHOWN:
A socket extension does not require a correction, since no change in length is made (Illustration 2.)