Hitachi WR 9DM Manual De Instrucciones página 14

English
<For WR9DM>
N•m M8 × 30
kgf•cm
80
800
High tension bolt
60
600
40
400
20
200
Ordinary bolt
0 0
0 1
Tightening time: sec
(Steel plate thickness
t = 10 mm)
Bolt
Nut
<For WR12DM>
kgf•cm
13
kgf•cm
1000
800
600
400
200
0
2 3
Steel plate thickness t
Fig. 18
M16 × 55 F10T (tighening time 3 sec)
N•m
160
1600
120
1200
When full recharged
800 80
40
400
When completely discharged
0
0
0 20 40
Number of tightenings (PCS)/charging
M10 × 30
N•m
100
High tension bolt
80
60
40
Ordinary bolt
20
0
0 1 2 3
Tightening time: sec
(Steel plate thickness
t = 10 mm)
Fig. 17
* The following bolt is used.
Ordinary bolt: Strength grade 4.8
High tensile bolt: Strength grade 12.9
(
Explanation of strength grade:
4 — Yield point of bolt: 320 N/mm
8 — Pulling strength of bolt: 400 N/mm
a
60 80 100 120
Fig. 19
M12 × 45
kgf•cm N•m
100
1000
High tension
bolt
80
800
60
600
40
400
Ordinary bolt
200 20
0 0
0
Tightening time: sec
(Steel plate thickness
t = 25 mm)
2 {32.6 kgf/mm
2
140
1 2 3
)
2 }
{40.8 kgf/mm 2 }