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Proper fastening torque for standard bolt
N•m
(kgf•cm)
140
(1428)
120
(1224)
100
(1020)
80
M12
(816)
2
60
(612)
M10
40
(408)
M8
20
(204)
0
1. Fastening time (second) 2. Fastening torque
NOTICE:
If you use a spare battery to continue the operation, rest the tool at least 15 min.
NOTE:
Use the proper bit for the head of the screw / bolt that you wish to use.
NOTE:
When fastening M8 or smaller screw, carefully adjust pressure on the switch trigger so that the screw
is not damaged.
NOTE:
Hold the tool pointed straight at the bolt or nut.
NOTE:
If the impact force is too strong or you tighten the screw for a time longer than shown in the figures,
the screw or the point of the driver bit may be over- stressed, stripped, damaged, etc. Before starting your
job, always perform a test operation to determine the proper fastening time for your screw.
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. Impact socket
● Failure to use the correct size impact socket will cause a reduction in the fastening torque.
● A worn impact 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.
M16
M14
M16
M14
M12
M10
M8
1
2
1
Proper fastening torque for high tensile bolt
N•m
(kgf•cm)
200
(2040)
180
(1836)
160
(1632)
140
(1428)
120
(1224)
2
100
(1020)
80
(816)
M8
60
(612)
40
(408)
20
(204)
0
1
1. Fastening time (second) 2. Fastening torque
M14
M14
M12
M10
M12
M10
M8
2
3
1
14
Keep Working
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