Hitachi Koki WH 12DAF2 Instrucciones De Manejo página 12

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〈 WR12DAF2 〉
kgf cm N m
• •
M8 × 30
1000 100
High tension
bolt
800 80
600 60
400 40
Ordinary bolt
200 20
0 0
0 1
Tightening time: sec.
(Steel plate thickness
t = 10 mm)
Bolt
Nut
〈WR12DAF2〉
11
kgf cm N m
• •
1200 120
1000 100
800 80
600 60
400 40
200 20
0 0
2 3
Tightening time: sec.
(Steel plate thickness
t = 10 mm)
Steel plate thickness t
M12 × 45 High tension bolt
(tighening time 3 sec)
kgf cm N m
• •
1600 160
1200 120
When full recharged
800 80
When completely
400 40
discharged
0 0
0 20
Number of tightenings (PCS)/charging
kgf
M10 × 30
High tension
bolt
Ordinary bolt
0 1 2 3
Fig. 19
*The following bolt is used.
Ordinary bolt: Strength grade 4.8
High tension bolt: Strength grade 12.9
(
Explanation of strength grade:
4 — Yield point of bolt: 32 kgf/mm
8 — Pulling strength of bolt: 40 kgf/mm
Fig. 20
a
40 60 80 100
Fig. 21
cm N m
• •
M12 × 45
1400 140
High tension
bolt
1200 120
1000 100
800 80
600 60
Ordinary bolt
400 40
200 20
0 0
0 1 2
Tightening time: sec.
(Steel plate thickness
t = 25 mm)
3
)
2
2