Selling Points Descriptions - Hitachi WH 14DMR Technical Data And Service Manual

5-1. Selling Points Descriptions

Refer to pages 4 through 10 of Technical Data and Service Manual for the Model WH 12DM2 for common selling
points.
Selling points of the Models WH 14DMR/WH 18DMR
Class-top tightening speed and torque
WH 14DMR: 140 N
WH 18DMR: 150 N
Both the Models WH 14DMR and WH 18DMR are equipped with a relatively inexpensive magnet and the
entire length is significantly shorter than the previous models respectively. However, the performance is
superior to the competitors thanks to the large hammer and the optimized impact timing. Comparison of
measured data with the previous model and the competitors is shown below.
Tightening time comparison
1
Figure 1 shows the time required for tightening a wood screw (5.3 mm dia. x 120 mm length) into a lauan
workpiece.
WH 14DMR: 10 % higher than P1
WH 18DMR: 15 % higher than P2
Voltage
14.4
14.4
14.4
18
18
* Tightening time may vary depending on hardness of the workpiece, ambient temperature, characteristics
of the battery, etc.
Tightening torque comparison
2
Figure 2 shows the torque required for
tightening an M14 high-strength tension
bolt in 3 seconds with a hexagon socket
(40 mm long).
WH 14DMR: 10 % higher than P1
WH 18DMR: 15 % higher than P2
m (1430 kgf cm, 1240 in-lbs.)
• •
m (1530 kgf cm, 1330 in-lbs.)
• •
Model
HITACHI WH 14DMR
HITACHI WH 14DM
P1
HITACHI WH 18DMR
P2
Fig. 1 Tightening time comparison
Fast
2
4
.
kgf cm
.
N m
1800 (1562 in-lbs.)
180
1600 (1389 in-lbs.)
160
1400 (1215 in-lbs.)
140
1200 (1042 in-lbs.)
120
1000 (868 in-lbs.)
100
800 (694 in-lbs.)
80
600 (521 in-lbs.)
60
40
400 (347 in-lbs.)
20
200 (174 in-lbs.)
0
WH 14DMR WH 14DM
Fig. 2 Tightening torque comparison
--- 4 ---
Slow
6
6.5 sec.
6.1 sec.
7.1 sec.
5.7 sec.
6.1 sec.
150
155
137
P1 WH 18DMR
(sec.)
8
162
140
P2