GENERAL INFORMATION
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Torque Wrenches
Use a torque wrench with a socket, torque
adapter or similar extension to tighten a fastener to a
measured torque. Torque wrenches come in several
drive sizes (1/4, 3/8, 1/2 and 3/4) and have various
methods of reading the torque value. The drive size
indicates the size of the square drive that accepts the
socket, adapter or extension. Common methods of
reading the torque value are the deflecting beam, the
dial indicator and the audible click (Figure 12).
When choosing a torque wrench, consider the
torque range, drive size and accuracy. The torque specifications in this manual provide an indication of
the range required.
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. Follow the 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 = TA×L
L+A
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