5-
1. Torque wrench extensions are designed to ex-
tend the range or versatility of torque wrenches.
Torque wrench scale readings or limit settings
shall be computed with the following formulas
when an extension handle is employed. The
sketch below shows which formula is to be used,
adding “A” or subtracting “A” when calculating
the torque wrench setting.
TW =
Ta x L or TW = Ta x L
L + A L – A
Ta = Torque required (specified)
TW = Wrench scale reading or limit setting of
torque wrench
L = Length of torque wrench in inches (center
of drive tang to handle pivot pin or center
of hand grip - extension handles are con-
sidered part of wrench length, when used)
A = Length of adapter extensions in inches.
"=2+z
THIS SIDE ADD “A”
THIS SIDE SUBTRACT “A”
TW
Ta
Ta
ACTUAL DIMENSION “A”
2. If the offset C/L is not in line with the torque
wrench C/L, then you must measure the distance
from the C/L of the torque wrench to the C/L of
the offset by using a square. Then apply this di-
mension to the torque wrench setting formula.
See sketch below.
3. If offset is positioned at right angles to the torque
wrench, then the offset will not change the effec-
tive length. Therefore, TW-wrench setting and Ta-
applied torque, will be the same value as if no
offset were used.
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