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Selling points of the Model WH 12DM
Class-top tightening speed
The Model WH 12DM is equipped with the new rare-earth magnet motor that is more powerful than the
previous model by 30% and the 35% larger hammer. With the computer analysis, the Model WH 12DM gives
optimum impact at tightening screws and the tightening speed is 30% higher than the previous model (10%
higher than C). The Model WH 12DM can also tighten long screws at high speed even into a hard wood
workpiece. Tightening time comparison of the Model WH 12DM with C is shown below. (Refer to pages 23
and later for detailed data on the tightening time and the working capacity.)
Tightening time comparison (Wood screw: 5.3 mm dia. x 120 mm length, hemlock spruce)
Model
HITACHI WH 12DM
HITACHI WH 12DH
C
* Tightening time may vary depending on hardness of the workpiece, ambient temperature, characteristics
of the battery, etc.
Maximum tightening torque: 100 N
The Model WH 12DM is equipped with a powerful motor having 33% larger volume of the armature and 1.4
times thicker winding (2 times larger cross section of the conductor) than C to reduce temperature rise.
Because the tightening torque is the same in both forward and reverse rotations, the tightening torque is not
reduced even when loosening bolts (this is the same feature in the previous models). C's speed and
tightening torque in reverse direction are lower than those in forward direction because the position of the
motor brush is shifted to obtain high power with the small motor.
Fast
3
1
2
4
m {1020 kgf
cm, 885 in-lbs.}
•
•
Slow
5
6
7
6.5 sec.
--- 10 ---
8
10
sec.
9
9.5 sec.
7.2 sec.
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