Tightening Torque - Hitachi WH 9DM2 Technical Data And Service Manual

6-3. Tightening Torque

6-3-1. Tightening torque characteristic comparisons
(1) Impact driver
Thanks to the high-power rare-earth magnet motor and the computer analysis, the Model WH 9DM gives
optimum impact at tightening screws and the tightening torque is increased.
.
kgf cm
N
1200 120
(1042 in-lbs.)
1000 100
(868 in-lbs.)
800
(694 in-lbs.)
600
(521 in-lbs.)
400
(347 in-lbs.)
200
(174 in-lbs.)
0
0
(2) Impact wrench
. N
kgf cm
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.)
400
(347 in-lbs.)
200
(174 in-lbs.)
0
0
WH 9DM
.
m
80
60
40
C
20
0
1
Tightening time
Fig. 1-1
WR 9DM2
.
m
WR 9DM
40
20
0
0 1
Tightening time
Fig. 1-2
WH 9DM2
Test conditions
Bolt: M12 x 45 mm (15/32" x 1-3/4")
(strength grade: 12.9)
Steel plate: Mild steel
M12 (15/32") Thickness = 25 mm (1")
Accessory tool: Hexagon socket ass'y
2 3 (sec.)
C
Test conditions
Bolt: M12 x 45 mm (15/32" x 1-3/4")
Steel plate: Mild steel
Accessory tool: Hexagon socket ass'y
2 3
(sec.)
--- 14 ---
(strength grade: 12.9)
M12 (15/32") Thickness = 25 mm (1")