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Craftsman 320.27990 Operator's Manual page 14

8a impact wrench
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After fastening,
always check the torque with a torque wrench. The fastening
torque is affected
by a wide variety of factors,
including
the following:
Voltage
o A voltage reduction
will cause a reduction
in the fastening
torque.
Socket
o Failure to use the correct
size socket will cause a reduction
in the fastening
torque.
o A worn socket
(wear on the hex end or square end) will cause a reduction
in the fastening
torque.
Bolt
o Although
the torque coefficient
and the class of bolt may be the same, the
proper fastening
torque will differ according
to the diameter
of the bolt.
o Even if the diameters
of bolts are the same, the proper
fastening
torque
will differ according
to the torque coefficient,
the class of bolt and the bolt
length.
The use of a universal joint or an extension
bar (both available
separately)
will
reduce the fastening
force of the impact wrench somewhat.
Compensate
by
fastening
for a longer period of time.
The manner of holding the tool or the material to be fastened
will affect the
torque.
27990
ManuaLRevised_10
1202
Page 14

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