GENERAL INFORMATION
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A torque wrench is a precision tool that must be properly cared for to remain accurate. Store
torque wrenches in cases or separate padded drawers within a toolbox. Please refer to the followed
manufacturer’s instructions for their care and calibration.
Torque Adapters
Torque adapters or extensions extend or
reduce the reach of a torque wrench. The torque
adapter shown in (Figure 13) is used to tighten a
fastener that cannot be reached because of the size
of the torque wrench head, drive, and socket. If a
torque adapter changes the effective lever length
(Figure 14), the torque reading on the wrench will
not equal the actual torque applied to the fastener. It
is necessary to recalibrate the torque setting on the
wrench to compensate for the change of lever length. When using a torque adapter at a right angle to
the drive head, calibration is not required, because the effective length has not changed.
To recalculate a torque reading when using a torque adapter, use the following formula and refer
to Figure 14:
TW =
AL
LTA
TW is the torque
setting or dial reading on
the wrench.
TA is the torque
specification and the
actual amount of torque
that is applied to the
fastener.
A is the amount that
the adapter increases
(or in some cases
reduces) the effective
lever length as
measured along the
centerline of the torque
wrench.
L is the lever length of
the wrench as measured
from the center of the
drive to the center of the
grip.
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