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5. About the engine
Tightening Torque of General Bolts
Please refer to the following tightening torque for the bolts
which are not listed in Tightening Torque of Main Parts.
1. Tightening Torque of General Bolts
3.6
Nominal
(4A)
Diameter ×
Pitch (mm)
20
M5
0.15
M6
0.28
M7
0.43
M8
0.7
M8 x 1
0.73
M10
1.35
M10 x 1
1.5
M12
2.4
M12 x 1.5
2.55
M14
3.7
M14 x 1.5
4.1
M16
5.6
M16 x 1.5
6.2
M18
7.8
M18 x 1.5
9.1
M20
11.5
M20 x 1.5
12.8
M22
15.5
M22 x 1.5
17
M24
20.5
M24 x 1.5
23
Note) The standard torque values above are about 70% of
the bolt elastic limit values.
Note) The tensile force has been calculated by multiplying
the tensile strength with the screw cross-sectional
area.
4.6
4.8
5.6
(4D)
(4S)
(5D)
24
32
30
0.16
0.25
0.22
0.30
0.45
0.4
0.46
0.7
0.63
0.75
1.1
1
0.8
1.2
1.1
1.4
2.2
1.9
1.6
2.5
2.1
2.5
3.7
3.3
2.7
4
3.5
3.9
6
5.2
4.3
6.6
5.7
6
9
8
6.5
9.7
8.6
8.3
12.5
11
9.5
14.5
12.5
12
18
16
13.5
20.5
18
16
24.5
21
18.5
28
24
21.5
33
27
25
37
31
Strength Classification
5.8
6.6
6.8
(5S)
(6D)
(6S)
Elastic Limit Value (kg/mm
40
36
46
Tightening Torque (kg·m)
0.31
0.28
0.43
0.55
0.47
0.77
0.83
0.78
1.2
1.4
1.25
1.9
1.5
1.34
2.1
2.7
2.35
3.7
3.1
2.8
4.3
4.7
4.2
6.3
5
4.6
6.8
7.5
7
10
8.3
7.5
11.1
11.5
10.5
17.9
12.5
11.3
17
16
14.5
21
18.5
16.7
24.5
22
19
31.5
25
22.5
35
30
26
42
34
29
47
40
34
55
45
38
61
Note) A special screw should be tightened with 85% of the
tightening torque of the standard value. For example,
a MoS2-coated screw should be tightened with 60% of
the tightening torque of the standard value.
74
6.9
8.8
10.9
(6G)
(8G)
(10K)
2
)
54
64
90
0.48
0.5
0.75
0.85
0.9
1.25
1.3
1.4
1.95
2.1
2.2
3.1
2.3
2.4
3.35
4.2
4.4
6.2
4.9
5
7.2
7.5
10.5
7.7
8
11.2
11.5
12
12.5
13
18.5
18.5
18
26
19.5
20
28
24.2
25
36
27.5
28
41
35
36
51
39.5
41
58
46
49
67
52
56
75
58
63
82
67
74
93
12.9
(12K)
106
0.9
1.5
2.35
3.8
4.1
7.4
7
8.4
12.5
13.4
17
20
22
31
33
43
49
60
68
75
85
92
103
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