Makita BTW074 Manuel D'instruction page 8

Standard bolt BTW074
N m
(ft lbs)
60
(44)
40
(29)
20
(14)
M6(1/4")
0
0 0.5
Fastening time
29
(13)
Number of impacts
(Presetting number)
N m
High tensile bolt BTW074
(ft lbs)
70
(50)
60
(44)
50
(37)
40
(30)
30
(22)
20
M6(1/4")
(15)
10
(7)
0
0 1
Fastening time
58
(25)
Number of impacts
(Presetting number)
N m
Standard bolt BTW104
(ft lbs)
70
(49)
60
(43)
40
(29)
M8(5/16")
20
(14)
M6(1/4")
0
0 0.5
Fastening time
29
(13)
Number of impacts (Presetting number)
M12(1/2")
(M12)(1/2")
M10(3/8")
M8(5/16")
(M10)(3/8")
(M8)(5/16")
(M6)(1/4")
1.5
1
Seconds
58 *1
(25) *2
M10(3/8")
(M10)
(3/8")
M8(5/16")
(M8)
(5/16")
(M6)
(1/4")
2 3
Seconds
*1
116
*2
(50)
M12(1/2")
M10(3/8")
(M12)(1/2")
(M10)(3/8")
(M8)(5/16")
(M6)(1/4")
1.0 1.5
Seconds
58 *1
(25) *2
N m
(ft lbs)
120
(87)
100
(72)
80
(58)
60
(43)
40
(29)
20
(14)
0
0
Fastening time
Number of impacts
(Presetting number)
NOTE:
• When fastening bolt M8 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, 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 15 minutes 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. 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 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
longer period of time.
8 ENGLISH
High tensile bolt BTW104
(3/8")
M10
(M10)(3/8")
M8 (5/16")
(M8)(5/16")
1 2
Seconds
(5/16")
116
58
(50)
(25)
*1
*2