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High tensile bolt
Kg
.
cm
( f t
.
Ibs)
800
(57)
600
m
(43)
P
E!
400
._
?
(29)
3
C
(u
c
m
200
(15)
Proper fastening
for
M8
( 5 / 1 6 ' )
torque
torque
0
1
2
3
Seconds
Fastening time
Hold the tool firmly and place the point of the driver bit in the screw head. Apply for-
ward pressure to the tool to the extent that the bit will not slip off the screw and turn the
tool on to start operation.
NOTE
:
0
Use the proper bit for the head of the screw that you wish to use.
Hold the tool pointed straight
a t
the screw.
0
If you fasten the screw for a time longer than shown in the figures above, the screw or
the screw or the point of the driver. bit may be overstressed, stripped, damaged,
etc.
Before starting your job, always perform a
test
operation to verify the adequate fasten-
ing time for your screw. When fastening a machine screw in a steel plate, the proper
fastening torque can be obtained in an extremely short time (approx. 0.1 -0.2 seconds).
Turn the tool off as soon as the impact sound i s heard.
.When fastening screw M8
(5/16')
or smaller, carefully adjust pressure on the trigger
switch so that the screw is not damaged.
The fastening torque i s 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.
Drive bit or socket bit
Failure to use the correct size driver bit or socket bit will cause
a
reduction in the
fastening torque.
10
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