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7-3. Tightening Torque
7-3-1. Tightening torque characteristic comparisons
Thanks to the high-power rare-earth magnet motor and the larger hammer inertia, the Models WH 12DM/
WR 12DM can provide greater tightening torque.
(1) Impact driver
kgf
cm
•
N
m
•
120
1200
(1042 in-lbs.)
100
1000
(868 in-lbs.)
80
800
(694 in-lbs.)
60
600
(521 in-lbs.)
40
400
(347 in-lbs.)
20
200
(174 in-lbs.)
0
0
0
0
(2) Impact wrench
N
m
kgf
cm
•
•
160
1600
(1389 in-lbs.)
140
1400
(1215 in-lbs.)
120
1200
(1042 in-lbs.)
100
1000
(868 in-lbs.)
80
800
(694 in-lbs.)
60
600
(521 in-lbs.)
40
400
(347 in-lbs.)
20
200
(174 in-lbs.)
0
0
0
0
WH 12DM
1
2
Tightening time
Fig. 4-1
WR 12DM
1
2
Tightening time
Fig. 4-2
Test conditions
Bolt: M12 x 45 mm (15/32" x 1-25/32")
(strength grade: 12.9)
Steel plate: Mild steel
Thickness = 25 mm (1")
Accessory tool: Hexagon socket
C (forward)
WH 12DH
3
(sec.)
Test conditions
Bolt: M16 x 55 mm (5/8" x 2-5/32") (F10T)
Steel plate: Mild steel
Thickness = 25 mm (1")
Accessory tool: Hexagon socket ass'y
WR 12DH
C
3
(sec.)
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