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Page 12
OPERATION
NOTICE: Excessive fastening torque may
damage the bolt/nut or socket. Before
starting your job, always perform a test
operation to determine the proper fasten-
ing time for your bolt or nut.
Practice with various fasteners, noting the
length of time required to reach the desired
torque. Check the tightness with a hand-
torque wrench. If the fasteners are too tight,
reduce the impacting time. If they are not
tight enough, increase the impacting time.
Hold the tool firmly, and place the socket
over the bolt or nut. Turn the tool on, and
fasten the bolt or nut to the proper torque.
The torque that is required to loosen a fas-
tener averages 75% to 80% of the tighten-
ing torque, depending on the condition of
the contacting surfaces. However, if rust or
corrosion causes seizing, more torque may
be required.
After fastening, always check the torque
with a torque wrench. The fastening torque
is affected by a wide variety of factors,
including the following:
• Socket
Failure to use the correct size socket will
cause a reduction in the fastening torque.
A worn socket (wear on the hex end or
square end) will cause a reduction in the
fastening torque.
• Bolt
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.
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.
• Accessories
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.
• Technique
The manner of holding the tool or the
material to be fastened will affect the
torque.
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