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4. Use a tightening time suitable for the screw
The appropriate torque for a screw differs according to the material and size of the
screw, and the material being screwed etc., so please use a tightening time suitable for
the screw. In particular, if a long tightening time is used in the case of screws smaller
than 5/16" (8 mm), there is a danger of the screw breaking, so please confirm the
tightening time and the tightening torque beforehand.
kgf·cm
5/16"×1-3/6"
N·m
(in-lbs)
(M8×30)
1000
100
(868)
800
80
(694)
High strenge bolt
600
60
(521)
400
40
(347)
200
20
(174)
Ordinary bolt
0
0
0
1
Tightening time: sec
(Steel plate thickness
t = 3/8" (10 mm))
Bolt
Nut
18
kgf·cm
N·m
(in-lbs)
1000
100
(868)
800
(694)
600
(521)
400
(347)
200
(174)
0
2
3
Tightening time: sec
(Steel plate thickness
t = 3/8" (10 mm))
Washer
Steel plate
thickness t
Washer
3/8"×1-3/6"
(M10×30)
80
High strenge bolt
60
40
Ordinary bolt
20
0
0
1
2
3
Fig. 15
*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
Fig. 16
kgf·cm
15/32"×1-3/4"
N·m
(in-lbs)
(M12×45)
1200
120
(1042)
1000
100
High strenge bolt
(868)
800
80
(694)
600
60
(521)
400
40
Ordinary bolt
(347)
200
20
(174)
0
0
0
1
2
Tightening time: sec
(Steel plate thickness
t = 3/8" (10 mm))
3
)
2
)
2
)
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