English, For wr9dm2, Fig. 20 – Hitachi WR9DM2 User Manual
Page 25: Bolt steel plate thickness t, Fig. 21 nut
English
25
100
80
60
40
20
0
0 1 2 3
1000
800
600
400
200
0
(868)
(694)
(521)
(347)
(174)
100
80
60
40
20
0
0 1 2 3
1000
800
600
400
200
0
(868)
(694)
(521)
(347)
(174)
0 1 2 3
140
120
100
80
60
40
20
0
(1215)
(1042)
(868)
(694)
(521)
(347)
(174)
1400
1200
1000
800
600
400
200
0
<For WR9DM2>
Tightening torque
Tightening torque
Tightening torque
High strength
bolt
High strength bolt
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)
kgf·cm
N·m
5/16"×1-3/6"
(in-lbs)
(M8×30)
Ordinary bolt
Ordinary bolt
Tightening time: sec
(Steel plate thickness
t = 3/8" (10 mm))
Tightening time: sec
(Steel plate thickness
t = 3/8" (10 mm))
Fig. 20
Tightening time: sec
(Steel plate thickness
t = 1" (25 mm))
Bolt
Steel plate
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
(
)
Fig. 21
Nut
High strength bolt