 
TM 9254
41.
Torque Wrench  Continued
d.
Adapter Length Compensation (figs. 45 and 46). When adapters are used that rotate about a center not
located at the center of the tang of the torque wrench, it is necessary to compensate for the additional length. An
extension will always increase the capacity of the wrench.
Figure 45. Torque Wrench  Straight Extension
(1)
When an extension adapter is used as shown in figure 45.
Let:
F
=
Force (pounds)
^{I}T
=
Wrench length (inches) measured from the middle of handle to the center of the tang.
^{I}A
=
Extension length (inches) measured from center of socket to center of drive square.
L
=
Effective lever length
L
=
^{I}T
+ I_{A}
Example:
(figure 45)
Assuming that the length of the torque wrench being used is 12 inches. The length of the extension is 2
inches. The torque setting of the wrench is 60 in. lbs.. The total torque applied at extension is 70 in. lbs.
Equation
^{T}A
= T_{T} X L or T_{A} = 60 X 14 or T_{A} = 70 in. lbs.
I
T
12
^{Where: T}A
=
Torque applied at extension
L
=
_{IT }(12 inches) + I_{A }(2 inches)
^{T}T
=
Setting of torque wrench (60 in. lbs.)
^{I}T
=
Wrench length (12 inches)
44
