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WR 14DH
WH 12D
WR 12DH
C (forward)
220
200
180
160
140
120
100
80
60
40
20
0
1
2
3
(sec.)
Tightening time
0
200
(174 in-lbs.)
400
600
800
1000
1200
1400
1600
1800
2000
2200
(347 in-lbs.)
(521 in-lbs.)
(694 in-lbs.)
(868 in-lbs.)
(1042 in-lbs.)
(1215 in-lbs.)
(1389 in-lbs.)
(1563 in-lbs.)
(1736 in-lbs.)
(1910 in-lbs.)
(kgf•cm)
(N•m)
Tightening torque
0
200
400
600
800
1000
1200
1400
1600
1800
2000
(in-lbs.)
6-2. Tightening Torque
6-2-1. Tightening torque characteristic comparisons
The Model WR 14DH provides greater tightening torque than the previous models thanks to the high power 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 Model WR 14DH with previous models are shown in Fig. 4. It should be noted that M16
(5/8") bolt (F10T) 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.
Test condtions
Bolt: M16 x 55 mm (5/8" x 2-5/32") (F10T)
Steel plate: Mild steel
Thickness = 25 mm (1")
Accessory tool: Hexagon socket ass'y
Fig. 4
