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5/16" × 1–3/6"
kg–cm
(M8 × 30)
(ft–lb)
1000
(72)
800
High tension bolt
(58)
600
(43)
400
(29)
200
(14)
Ordinary bolt
0
0
1
2
3
Tightening time: sec
(Steel plate thickness
t = 3/8" (10 mm))
Fig. 8
Bolt
Steel plate
thickness t
Nut
Fig. 11
kg–cm
(ft–lb)
1200
(87)
800
(58)
400
(29)
0
0
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3/8" × 1–3/6"
kg–cm
(M10 × 30)
(ft–lb)
1000
(72)
High tension bolt
800
(58)
600
(43)
400
(29)
Ordinary bolt
200
(14)
0
0
1
Tightening time: sec
(Steel plate thickness
t = 3/8" (10 mm))
Fig. 9
*The following bolt is used.
Ordinary bolt: Strength grade 4.8
High tensile bolt: Hardness division 12.9
(
Explanation of strength grade:
4 — Yield point of bolt: 45,500 psi (32 kgf/mm
8 — Pulling strength of bolt: 56,900 psi (40 kgf/mm
M14 × 50 High tensile bolt (tightening time 3 sec)
When full recharged
When completely discharged
20
40
60
Number of tightenings (PCS)/charging
Fig. 12
kg–cm
(ft–lb)
1200
(86)
1000
(72)
800
(58)
600
(43)
400
(29)
200
(14)
2
3
a
80
100
120
English
15/32" × 1–3/4"
(M12 × 45)
High tension bolt
Ordinary bolt
0
0
1
2
3
Tightening time: sec
(Steel plate thickness
t = 1" (25 mm))
Fig. 10
)
2
)
2
)
17
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