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Tightening torque
Number of tightenings (PCS)/charging
kgf•cm
1600
1200
800
400
0
0
20
40
60
80
100 120 140
N•m
160
120
80
40
0
a
When full recharged
When completely discharged
Explanation of strength grade:
4 — Yield point of bolt: 320 N/mm
2
{32.6 kgf/mm
2
}
8 — Pulling strength of bolt: 400 N/mm
2
{40.8 kgf/mm
2
}
* The following bolt is used.
Ordinary bolt: Strength grade 4.8
High tensile bolt: Strength grade 12.9
(
Bolt
Nut
Fig. 18
Steel plate thickness t
)
Tightening time: sec
(Steel plate thickness
t = 10 mm)
Tightening time: sec
(Steel plate thickness
t = 10 mm)
Tightening time: sec
(Steel plate thickness
t = 25 mm)
M8 × 30
kgf•cm
800
600
400
200
0
N•m
80
60
40
20
0
0
1 2 3
High tension bolt
Ordinary bolt
M10 × 30
kgf•cm
1000
800
600
400
200
0
N•m
100
80
60
40
20
0
0
1 2 3
High tension bolt
Ordinary bolt
M12 × 45
kgf•cm
1000
800
600
400
200
0
N•m
100
80
60
40
20
0
0
1 2 3
High tension
bolt
Ordinary bolt
<For WR9DM>
Fig. 17
<For WR12DM>
Fig. 19
M16 × 55 F10T (tighening time 3 sec)
Tightening torque
Tightening torque
Tightening torque