Tightening Speed - Hitachi WR12DMB - 12.0 V 1/2" Impact Wrench 2 Battery Service Manual

7-4. Tightening Time
Thanks to the new 30% higher power rare-earth magnet motor, the 35% larger hammer and the computer
analysis, the Model WH 12DM gives optimum impact at tightening screws and the tightening speed is 30% higher
than the previous model. Tightening time comparison is shown below.
The data below are intended for reference purposes only because actual tightening time will vary depending on
hardness of the workpiece, ambient temperature, characteristics of the battery, etc.
1 Wood screw 5.3 mm dia. x 120 mm length, hemlock spruce
Model
HITACHI WH 12DM
HITACHI WH 12DH
C
2 Wood screw 5.3 mm dia. x 120 mm length, lauan
Model
HITACHI WH 12DM
HITACHI WH 12DH
C
3 Wood screw 4.5 mm dia. x 90 mm length, hemlock spruce
Model
HITACHI WH 12DM
HITACHI WH 12DH
C
4 Wood screw 4.5 mm dia. x 90 mm length, lauan
Model
HITACHI WH 12DM
HITACHI WH 12DH
C
2 3
1
6
2 4 8
2
1
2
1
--- 23 ---
Fast
5 6 7
4
6.5 sec.
Fast
10 12 14
9.5 sec.
11.9 sec.
Fast
3
2.4 sec.
3.2 sec.
Fast
3
Slow
8 9 10
9.5 sec.
7.2 sec.
Slow
16 18 20
19 sec.
Slow
5
4
4.1 sec.
Slow
5
4
3.7 sec.
4.3 sec.
sec.
sec.
sec.
sec.
5.1 sec.