Hitachi WH 12DH, Технические данные и руководство по обслуживанию

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7-3. Tightening torque
7-3-1. Tightening Torque Characteristic comparisons
The Model WH 12DH and WR 12DH provide greater tightening torque than that of the previous models thanks to
the high power rare-earth magnet motor and the higher moment of inertia of the hammer. The tightening torque
does not drop even when loosening bolts because the motor runs at the same torque and speed in both the
forward and reverse directions.
Tightening torque comparisons of Models WH 12DH and WR 12DH with previous models are shown in Figs. 4-1
and 4-2. It should be noted that M12 (15/32") and M14 (9/16") strength grade 12.9 high-strength bolts were
utilized in the tests to ensure that the bolts were not stripped or distorted, even though such bolts are actually
beyond the recommended maximum capacity of these models. Accordingly, the data in the figures below are
intended for reference purposes only.
Fig. 4-1
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
Bolt: M14 x 50 mm (9/16" x 2")
(strength grade: 12.9)
Steel plate: Mild steel, thickness: 25 mm (1")
Accessory tool: Hexagon socket
HITACHI
WH 12DH
HITACHI
WH 12DC
200
(19.6 N
•
m,
14 ft-lbs)
0 1 2 3
400
(39.2 N
•
m,
29 ft-lbs)
600
(58.8 N
•
m,
43 ft-lbs)
800
(78.4 N
•
m,
58 ft-lbs)
1000
(98 N
•
m,
72 ft-lbs)
1200
(117.6 N
•
m,
86 ft-lbs)
1400
(137.2 N
•
m,
100 ft-lbs)
(kgf
•
cm)
(sec)
Tightening time
Tightening torque
HITACHI
WH 12DH
C
200
(19.6 N
•
m,
14 ft-lbs)
0 1 2 3
400
(39.2 N
•
m,
29 ft-lbs)
600
(58.8 N
•
m,
43 ft-lbs)
800
(78.4 N
•
m,
58 ft-lbs)
1000
(98 N
•
m,
72 ft-lbs)
1200
(117.6 N
•
m,
86 ft-lbs)
1400
(137.2 N
•
m,
100 ft-lbs)
(kgf
•
cm)
(sec)
Tightening time
Impact Driver
Impact Wrench
Tightening torque
HITACHI
WH 12D
C (forward)
[Tightening torque
in reverse rotation
is about 87% of
that in forward
rotation.]