--- 4 ---
HITACHI WH 9DMR
HITACHI WH 9DM2
3.3 sec.
Model
(sec.)
4.6 sec.
3.3 sec.
6
12
8
14
4
2
10
Fast
Slow
P
16
* Tightening time may vary depending on hardness of the workpiece, ambient temperature, characteristics
of the battery, etc.
Selling points of the Model WH 9DMR
Top class tightening speed and tightening torque 105 N.m (1070 kgf.cm, 930 in-lbs.)
Although the Model WH 9DMR is equipped with an anisotropic bonded magnet that is cheaper than that of the
Model WH 9DM2, the performance is superior to the Model WH 9DM2 thanks to the large hammer and the
optimized impact timing. Comparison of measured data with the Model WH 9DM2 and competitors is shown
below.
Tightening time comparison
Figure 1 shows the time required for tightening a wood screw (4.5 mm dia. x 90 mm length) into a lauan
workpiece. (40% shorter than the Model WH 9DM2 and equivalent to P).
109
40
80
160
0
WH 9DMR
WH 9DM2
400 (347 in-lbs.)
800 (694 in-lbs.)
1200 (1042 in-lbs.)
N.m
120
1600 (1389 in-lbs.)
82
105
140
100
60
200 (174 in-lbs.)
1000 (868 in-lbs.)
600 (521 in-lbs.)
1400 (1215 in-lbs.)
kgf.cm
20
P
T
ightening torque
1
Fig. 1 Tightening time comparison
Tightening torque comparison
Figure 2 shows the torque required for
tightening an M12 high-strength tension
bolt in 3 seconds with a hexagon socket
(40 mm long) (33% higher than
WH 9DM2 and 4% higher than P).
2
Fig. 2 Tightening torque comparison
5-1. Selling Point Descriptions
Refer to pages 4 though 10 of Technical Data Service Manual for the Models WH 9DMR/WR 9DMR for common
selling points.
Model WR 9DMR
(1) Class-top tightening torque 115 N
•
m (1170 kgf
•
cm, 1020 in-lbs.)
The right graph shows a comparison of tightening torque when
tightening an M12 high-strength bolt with a hexagonal socket
(overall length 33 mm) for 3 seconds. The tightening torque of
the Model WR 9DMR is equivalent to the current Model
WR 9DM2. (3 % lower than the Model WR 9DM2.)
122
118
160
140
120
100
80
60
40
20
0
WR 9DM2
WR 9DMR
T
ightening torque
(N.m)