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640
994
1,370
1,940
2,640
3,353
1,735
2,700
3,720
5,280
7,180
9,125
Diameters and effective sectional areas of bolts
Nominal diameter of bolt
Effective sectional area
of bolt (mm
2
)
Tightening torque according to strength grade of bolts
<Table 3>
Nominal
diameter of bolt
Strength grade
M14 x 2.0
M16 x 2.0
M18 x 2.5
M20 x 2.5
M22 x 2.5
M24 x 3.0
4.8 6.8 8.8 10.9
kgf-cm <Table 4>
12.9
960
1,493
2,054
2,912
3,960
5,035
1,280
1,990
2,740
3,880
5,276
6,705
2,075
3,240
4,455
6,340
8,613
10,945
6-4. Tightening Torque Characteristics when Using an Extension Cord
Figure 2 shows relationship between the tightening time and the tightening torque when using an extension cord.
While the data are useful for handy reference, actual tightening torque will vary depending on tightening
conditions.
Fig. 2
When using a 60-m
extension cord
Bolt: M22 x 70 (F10T) high tension bolt
Steel plate: SS34P, 30 mm in thickness
Tightening time (S)
When using a 30-m
extension cord
When using no
extension cord
Tightening torque (N
.
m)
M14 x 2.0
115.0
M16 x 2.0
157.0
M18 x 2.5
192.0
M20 x 2.5
245.0
M22 x 2.5
303.0
M24 x 3.0
353.0