Hitachi WR 22SE Instruction Manual And Safety Instructions page 11

ft·lbs N·m
664 900
590 800
516 700
443 600
369 500
259 400
0 0
0
(3) Diameter of bolt:
The tightening torque diff ers with the diameter of the bolt. Generally a larger diameter bolt
has a larger tightening torque.
(4) Tightening conditions:
The tightening torque diff ers according to the torque ratio; class, and length of bolts even
when bolts with the same size threads are used. The tightening torque also diff ers according
to the condition of the surface of metal through which the bolts are to be tightened.
(5) Using optional parts:
The tightening torque is reduced a little when an extension bar, universal joint or a long
socket is used.
(6) Clearance of the socket:
A worn or deformed hex. or a square-holed socket will not give an adequate tightness to the
fi tting between the nut or anvil, consequently resulting in loss of tightening torque.
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 2.
6. The protection function
To protect the tool, the protection function will be activated, automatically shutting down
the unit in the event of any problems. Table 1 describes each situation for which the
aforementioned may occur.
Table 1
Automatic shutdown initiated by excessive load (*1)
Automatic shutdown initiated due to the tool's internal temperature exceeding the specifi ed
temperature level (*2)
WR22SE
M22×70 (F10T)
Rating 120V
2 4 6 8 10
(sec.)
Tightening time
Indicated Situation
ft·lbs N·m
738 1000
664 900
590 800
516 700
443 600
369 500
0 0
Fig. 6
WR25SE
M24×70 (F10T)
Rating 120V
0 2 4 6
Tightening time
English
8 10
(sec.)
11