■ CAUTION ■
- The special parts are excluded.
- The bolts/nuts in these tables have a strength (discrimination) number/symbol assigned to the head or the like. As to the relation between the strength grade in these tables and the strength (discrimination) number/symbol, refer to “DISCRIMINATION OF BOLTS AND NUTS”.
 PREVIOUS STANDARD
Grade (Strength grade)
|
Bolt size
|
Bolt diameter mm
|
Hexagonal width across flats mm
|
Pitch mm
|
Tightening torque (Without lubricant)
|
Hexagon head bolt
|
Hexagon flange bolt
|
N·m
|
kg-m
|
ft-lb
|
in-lb
|
N·m
|
kg-m
|
ft-lb
|
in-lb
|
4T
|
M6
|
6.0
|
10
|
1.0
|
5.5
|
0.56
|
4
|
49
|
7
|
0.71
|
5
|
62
|
M8
|
8.0
|
12
|
1.25
|
13.5
|
1.4
|
10
|
—
|
17
|
1.7
|
13
|
—
|
1.0
|
13.5
|
1.4
|
10
|
—
|
17
|
1.7
|
13
|
—
|
M10
|
10.0
|
14
|
1.5
|
28
|
2.9
|
21
|
—
|
35
|
3.6
|
26
|
—
|
1.25
|
28
|
2.9
|
21
|
—
|
35
|
3.6
|
26
|
—
|
M12
|
12.0
|
17
|
1.75
|
45
|
4.6
|
33
|
—
|
55
|
5.6
|
41
|
—
|
1.25
|
45
|
4.6
|
33
|
—
|
65
|
6.6
|
48
|
—
|
M14
|
14.0
|
19
|
1.5
|
80
|
8.2
|
59
|
—
|
100
|
10
|
74
|
—
|
7T
|
M6
|
6.0
|
10
|
1.0
|
9
|
0.92
|
7
|
80
|
11
|
1.1
|
8
|
97
|
M8
|
8.0
|
12
|
1.25
|
22
|
2.2
|
16
|
—
|
28
|
2.9
|
21
|
—
|
1.0
|
22
|
2.2
|
16
|
—
|
28
|
2.9
|
21
|
—
|
M10
|
10.0
|
14
|
1.5
|
45
|
4.6
|
33
|
—
|
55
|
5.6
|
41
|
—
|
1.25
|
45
|
4.6
|
33
|
—
|
55
|
5.6
|
41
|
—
|
M12
|
12.0
|
17
|
1.75
|
80
|
8.2
|
59
|
—
|
100
|
10
|
74
|
—
|
1.25
|
80
|
8.2
|
59
|
—
|
100
|
10
|
74
|
—
|
M14
|
14.0
|
19
|
1.5
|
130
|
13
|
96
|
—
|
170
|
17
|
125
|
—
|
9T
|
M6
|
6.0
|
10
|
1.0
|
11
|
1.1
|
8
|
—
|
13.5
|
1.4
|
10
|
—
|
M8
|
8.0
|
12
|
1.25
|
28
|
2.9
|
21
|
—
|
35
|
3.6
|
26
|
—
|
1.0
|
28
|
2.9
|
21
|
—
|
35
|
3.6
|
26
|
—
|
M10
|
10.0
|
14
|
1.5
|
55
|
5.6
|
41
|
—
|
80
|
8.2
|
59
|
—
|
1.25
|
55
|
5.6
|
41
|
—
|
80
|
8.2
|
59
|
—
|
M12
|
12.0
|
17
|
1.75
|
100
|
10
|
74
|
—
|
130
|
13
|
96
|
—
|
1.25
|
100
|
10
|
74
|
—
|
130
|
13
|
96
|
—
|
M14
|
14.0
|
19
|
1.5
|
170
|
17
|
125
|
—
|
210
|
21
|
155
|
—
|
■ CAUTION ■
The parts with aluminum or the cast iron washer surface/thread surface are excluded.
 NEW STANDARD BASED ON ISO
Grade (Strength grade)
|
Bolt size
|
Bolt diameter mm
|
Hexagonal width across flats mm
|
Pitch mm
|
Tightening torque
|
Hexagon head bolt
|
Hexagon flange bolt
|
N·m
|
kg-m
|
ft-lb
|
in-lb
|
N·m
|
kg-m
|
ft-lb
|
in-lb
|
4.8 (Without lubricant)
|
M6
|
6.0
|
10
|
1.0
|
5.5
|
0.56
|
4
|
49
|
7
|
0.71
|
5
|
62
|
M8
|
8.0
|
13
|
1.25
|
13.5
|
1.4
|
10
|
—
|
17
|
1.7
|
13
|
—
|
1.0
|
13.5
|
1.4
|
10
|
—
|
17
|
1.7
|
13
|
—
|
M10
|
10.0
|
16
|
1.5
|
28
|
2.9
|
21
|
—
|
35
|
3.6
|
26
|
—
|
1.25
|
28
|
2.9
|
21
|
—
|
35
|
3.6
|
26
|
—
|
M12
|
12.0
|
18
|
1.75
|
45
|
4.6
|
33
|
—
|
55
|
5.6
|
41
|
—
|
1.25
|
45
|
4.6
|
33
|
—
|
65
|
6.6
|
48
|
—
|
M14
|
14.0
|
21
|
1.5
|
80
|
8.2
|
59
|
—
|
100
|
10
|
74
|
—
|
4.8 (With lubricant)
|
M6
|
6.0
|
10
|
1.0
|
4
|
0.41
|
3
|
35
|
5.5
|
0.56
|
4
|
49
|
M8
|
8.0
|
13
|
1.25
|
11
|
1.1
|
8
|
—
|
13.5
|
1.4
|
10
|
—
|
1.0
|
11
|
1.1
|
8
|
—
|
13.5
|
1.4
|
10
|
—
|
M10
|
10.0
|
16
|
1.5
|
22
|
2.2
|
16
|
—
|
28
|
2.9
|
21
|
—
|
1.25
|
22
|
2.2
|
16
|
—
|
28
|
2.9
|
21
|
—
|
M12
|
12.0
|
18
|
1.75
|
35
|
3.6
|
26
|
—
|
45
|
4.6
|
33
|
—
|
1.25
|
35
|
3.6
|
26
|
—
|
45
|
4.6
|
33
|
—
|
M14
|
14.0
|
21
|
1.5
|
65
|
6.6
|
48
|
—
|
80
|
8.2
|
59
|
—
|
8.8 (With lubricant)
|
M6
|
6.0
|
10
|
1.0
|
8
|
0.82
|
6
|
71
|
10
|
1.0
|
7
|
89
|
M8
|
8.0
|
13
|
1.25
|
21
|
2.1
|
15
|
—
|
25
|
2.6
|
18
|
—
|
1.0
|
21
|
2.1
|
15
|
—
|
25
|
2.6
|
18
|
—
|
M10
|
10.0
|
16
|
1.5
|
40
|
4.1
|
30
|
—
|
50
|
5.1
|
37
|
—
|
1.25
|
40
|
4.1
|
30
|
—
|
50
|
5.1
|
37
|
—
|
M12
|
12.0
|
18
|
1.75
|
70
|
7.1
|
52
|
—
|
85
|
8.7
|
63
|
—
|
1.25
|
70
|
7.1
|
52
|
—
|
85
|
8.7
|
63
|
—
|
M14
|
14.0
|
21
|
1.5
|
120
|
12
|
89
|
—
|
140
|
14
|
103
|
—
|
10.9 (With lubricant)
|
M6
|
6.0
|
10
|
1.0
|
10
|
1.0
|
7
|
89
|
12
|
1.2
|
9
|
106
|
M8
|
8.0
|
13
|
1.25
|
27
|
2.8
|
20
|
—
|
32
|
3.3
|
24
|
—
|
1.0
|
27
|
2.8
|
20
|
—
|
32
|
3.3
|
24
|
—
|
M10
|
10.0
|
16
|
1.5
|
55
|
5.6
|
41
|
—
|
65
|
6.6
|
48
|
—
|
1.25
|
55
|
5.6
|
41
|
—
|
65
|
6.6
|
48
|
—
|
M12
|
12.0
|
18
|
1.75
|
95
|
9.7
|
70
|
—
|
110
|
11
|
81
|
—
|
1.25
|
95
|
9.7
|
70
|
—
|
110
|
11
|
81
|
—
|
M14
|
14.0
|
21
|
1.5
|
160
|
16
|
118
|
—
|
180
|
18
|
133
|
—
|
■ CAUTION ■
- Use tightening torque with lubricant for the new standard bolts/nuts in principle. Friction coefficient stabilizer is applied to the new standard bolts/nuts.
- However, use tightening torque without lubricant for the following cases. Friction coefficient stabilizer is not applied to the following bolts/nuts.
- Grade 4.8, M6 size bolt, Conical spring washer installed
- Paint removing nut (Size M6 and M8) for fixing with weld bolt
 DISCRIMINATION OF BOLTS AND NUTS
|