Hitachi wh9dm ユーザーズマニュアル
English
19
Fig. 15
Bolt
Nut
Steel plate
thickness t
thickness t
Explanation of strength grade:
4 — Yield point of bolt: 45,500 psi (32 kgf/mm
2
)
8 — Pulling strength of bolt: 56,900 psi (40 kgf/mm
2
)
*The following bolt is used.
Ordinary bolt: Strength grade 4.8
High tensile bolt: Hardness division 12.9
Ordinary bolt: Strength grade 4.8
High tensile bolt: Hardness division 12.9
(
)
1200
1000
800
600
400
200
0
120
100
80
60
40
20
0
0 1 2 3
(868)
(694)
(521)
(347)
(174)
(1042)
1000
800
600
400
200
0
100
80
60
40
20
0
0 1 2 3
(868)
(694)
(521)
(347)
(174)
1000
800
600
400
200
0
100
80
60
40
20
0
0 1 2 3
(868)
(694)
(521)
(347)
(174)
<For WH9DM>
Tightening time: sec
(Steel plate thickness
t = 3/8" (10 mm))
t = 3/8" (10 mm))
Tightening time: sec
(Steel plate thickness
t = 1" (25 mm))
t = 1" (25 mm))
Tightening time: sec
(Steel plate thickness
t = 1" (25 mm))
t = 1" (25 mm))
Tightening torque
Tightening torque
Tightening torque
High strenge bolt
High strenge bolt
Ordinary bolt
Ordinary bolt
Ordinary bolt
kgf·cm
N·m
5/16"
×1-3/6"
(in-lbs)
(M8
×30)
kgf·cm
N·m
3/8"
×1-3/6"
(in-lbs)
(M10
×30)
kgf·cm
N·m
15/32"
×1-3/4"
(in-lbs)
(M12
×45)
High strenge bolt
Fig. 14