Hitachi WH 12DM Handling Instructions Manual page 38

English
For WH12DM
N•m
kgf•cm M8 × 30
100
1000
80
800
High tension bolt
60
600
40
400
200 20
0 0
0 1
Tightening time: sec
(Steel plate thickness
t = 10 mm)
For WH9DM
kgf•cm N•m M8 × 30
100
1000
80
800
High tension bolt
60
600
40
400
200 20
0 0
0 1
Tightening time: sec
(Steel plate thickness
t = 10 mm)
Bolt
Nut
37
kgf•cm N•m
100
1000
800
600
400
200
0
2 3
kgf•cm N•m
100
1000
800
600
400
200
0
2 3
Tightening time: sec
(Steel plate thickness
t = 25 mm)
Steel plate thickness t
M10 × 30
High tension bolt
80
60
40
Ordinary bolt
20
0
0 1 2 3
Tightening time: sec
(Steel plate thickness
t = 10 mm)
Fig. 16
M10 × 30
High tension bolt
80
60
40
Ordinary bolt
20
0
0 1 2 3
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: 32 kgf/mm
8 — Pulling strength of bolt: 40 kgf/mm
Fig. 18
M12 × 45
kgf•cm N•m
120
1200
High tension bolt
100
1000
80
800
60
600
Ordinary bolt
40
400
200 20
0 0
0 1
Tightening time: sec
(Steel plate thickness
t = 10 mm)
M12 × 45
kgf•cm N•m
120
1200
High tension bolt
100
1000
80
800
60
600
40
400 Ordinary bolt
200 20
0 0
0 1 2
Tightening time: sec
(Steel plate thickness
t = 25 mm)
2 3
3
)
2
2