Hitachi Koki WH 14DSL Instructions De Sécurité Et Mode D'emploi page 17

(4) Tightening conditions
The tightening torque differs according to the torque
ratio, class, and length of bolts even when bolts with
the same size threads are used. The tightening
torque also differs according to the condition of the
surface of workpiece through which the bolts are to
be tightened. When the bolt and nut turn together,
torque is greatly reduced.
(5) Using optional parts (WR14DSL)
The tightening torque is reduced a little when an
extension bar, universal joint or a long socket is used.
(6) Clearance of the socket (WR14DSL)
A worn or deformed hex. or a square-holed socket
will not give an adequate tightness to the fitting
between the nut or anvil, consequently resulting in
loss of tightening torque.
<For WH14DSL>
kgf·cm
(in-lbs) N·m
1,500
(1,302)
1,000
Tightening time: sec.
(Steel plate thickness
t = 1"(25 mm))
Save mode
150
High tension bolt 15/32"
100
(M12)
(868)
500 50
(434)
Ordinary bolt 15/32"
(M12)
0 0
0 1 2 3
0
Using an improper socket which does not match to
the bolt will result in an insufficient tightening
torque. Matching socket and bolt sizes are shown in
Table 6 and 7.
(7) Tightening torque varies, depending on the battery's
charge level (WR14DSL)
Fig. 17 show an example of the relationship between
tightening torque and the number of tightenings. As
shown, tightening torque gradually weakens with
the increase in the number of tightenings. In
particular, as the torque decreases very close to the
complete discharge ("a" margin in graph), the unit's
impact weakens, the number of time impacts
declines and tightening torque drops off abruptly. If
this occurs, check torque level, then recharge the
battery if necessary.
kgf·cm
Power mode
(in-lbs) N·m
1,500 150
(1,302)
1,000 100
High tension bolt 15/32" (M12)
(868)
500 50
Ordinary bolt 9/16"
(434)
(M14)
Ordinary bolt 15/32" (M12)
0 0
0
0 1
Tightening time: sec.
(Steel plate thickness
t = 1"(25 mm))
Fig. 14
English
High tension bolt 9/16" (M14)
2 3
17