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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.
Proper fastening torque for standard bolt
N•m
(ft•lbs)
280
(207)
240
(177)
200
(148)
160
2
(118)
120
(89)
80
M12
(59)
40
(30)
0
1. Fastening time (second) 2. Fastening torque
Proper fastening torque for high tensile bolt
N•m
(ft•lbs)
280
(207)
240
(177)
200
(148)
160
2
(118)
120
(89)
80
(59)
40
(30)
0
1. Fastening time (second) 2. Fastening torque
NOTE: Hold the tool pointed straight at the bolt or nut.
NOTE: Excessive fastening torque may damage the
bolt/nut or impact socket. Before starting your job,
always perform a test operation to determine the
proper fastening time for your bolt or nut.
NOTE: If the tool is operated continuously until the battery
cartridge has discharged, allow the tool to rest for 15 min-
utes before proceeding with a fresh battery cartridge.
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
M20
M16
2
1
1
M16H
M14H
M12H
1
2
3
1
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 fasten-
ing torque will differ according to the diame-
ter 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
M20
longer period of time.
5.
The manner of holding the tool or the material
of driving position to be fastened will affect the
M16
torque.
6.
Operating the tool at low speed will cause a reduc-
M12
tion in the fastening torque.
MAINTENANCE
CAUTION:
switched off and the battery cartridge is removed
before attempting to perform inspection or
maintenance.
NOTICE:
M16H
alcohol or the like. Discoloration, deformation or
cracks may result.
M14H
To maintain product SAFETY and RELIABILITY,
repairs, any other maintenance or adjustment should
be performed by Makita Authorized or Factory Service
M12H
Centers, always using Makita replacement parts.
OPTIONAL
ACCESSORIES
CAUTION:
are recommended for use with your Makita tool
specified in this manual. The use of any other
accessories or attachments might present a risk of
injury to persons. Only use accessory or attachment
for its stated purpose.
If you need any assistance for more details regard-
ing these accessories, ask your local Makita Service
Center.
•
Impact socket
•
Extension bar
•
Universal joint
•
Socket bit adapter
•
Makita genuine battery and charger
NOTE: Some items in the list may be included in the
tool package as standard accessories. They may
differ from country to country.
9 ENGLISH
Always be sure that the tool is
Never use gasoline, benzine, thinner,
These accessories or attachments
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