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OPERATION
011766
The proper fastening torque may differ depending upon
the kind or size of the bolt, the material of the workpiece
to be fastened, etc. The relation between fastening
torque and fastening time is shown in the figures.
80
60
40
20
0
1.0 2.0 3.0
Fastening torque
M8(5/16")
M10(3/8")
Fastening time (S)
Proper fastening torque
(29)
(14)
N m
(ft lbs)
(58)
(43)
Standard bolt
M12(1/2")
M12(1/2")
M10(3/8")
M8(5/16")
011825
0 1.0 2.0 3.0
High tensile bolt
Fastening torque
M6(1/4")
Fastening time (S)
Proper fastening torque
M6
80
60
40
20
M8(5/16")
M10(3/8")
(29)
(14)
N m
(ft lbs)
(58)
(43)
M10
(3/8")
M8
(5/16")
(1/4")
011823
Hold the tool firmly and place the socket over the bolt or
nut. Turn the tool on and fasten for the proper fastening
time.
NOTE:
• When fastening screw M8 (5/16") or smaller,
carefully adjust pressure on the switch trigger so
that the screw is not damaged.
• Hold the tool pointed straight at the bolt or nut
without applying excessive pressure on the tool.
• Excessive fastening torque may damage the
bolt/nut or socket. Before starting your job, always
perform a test operation to determine the proper
fastening time for your bolt or nut. Especially for the
bolt smaller than M8 (5/16"), perform the above test
operation to prevent the trouble on socket or bolt,
etc.
• If the tool is operated continuously until the battery
cartridge has discharged, allow the tool to rest for
more than 15 minutes before proceeding with a
fresh battery.
The fastening torque is affected by a wide variety of
factors including the following. After fastening, always
check the torque with a torque wrench.
1. When the battery cartridge is discharged almost
completely, voltage will drop and the fastening
torque will be reduced.
2. 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.
3. Bolt
• Even though the torque coefficient and the
class of bolt are the same, the proper fastening
torque will differ according to the diameter of
bolt.
• Even though 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.
4. The use of the universal joint or the extension bar
somewhat reduces the fastening force of the
impact wrench. Compensate by fastening for a
longer period of time.
5. The manner of holding the tool or the material of
driving position to be fastened will affect the
torque.
6. Operating the tool at low speed will cause a
reduction in the fastening torque.
Using holster (optional accessory)
CAUTION:
• Do not use for tools such as a drill with a bit
installed on them.
• Turn off a tool and wait until it comes to a complete
stop before placing in the holster.
Be sure to close the holster securely so that it holds
the tool firmly.