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 = TA×L
L+A
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.
The effective length is the sum of L and A.
Example:
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