38
ENGLISH
TORQUE CHART
B
GENERAL TORQUE SPECIFICATION
B
TIGHTENING TORQUE CHART
A
Figure "7" on the top of the bolt indicates that the bolt is of special material.
A
Before tightening, check the figure on the top of bolt.
American standard cap screws
with UNC or UNF threads
Metric cap screws
SAE grade No.
GR.5 GR.8
Property class
Class 8.8
Class 10.9
1/4
(N-m)
(kgf-m)
10.7 - 12.9
1.11 - 1.33
16.1 - 19.3
1.66 - 1.99
M6
(N-m)
(kgf-m)
10.8 - 11.3
1.1 - 1.15
5/16
(N-m)
(kgf-m)
23.1 - 27.8
2.35 - 2.84
32.5 - 39.3
3.31 - 4.01
M8
(N-m)
(kgf-m)
25.9 - 27.4
2.6 - 2.8
32.3 - 34.3
3.3 - 3.5
3/8
(N-m)
(kgf-m)
47.5 - 57.0
4.84 - 5.82
61.0 - 73.2
6.22 - 7.47
M10
(N-m)
(kgf-m)
52.8 - 55.8
5.4 - 5.7
66.9 - 70.5
6.8 - 7.2
7/16
(N-m)
(kgf-m)
75.9 - 89.5
7.74 - 9.12
101.7 - 122
10.37 - 12.44
M12
(N-m)
(kgf-m)
85.2 - 90.1
8.7 - 9.2
114 - 117
11.6 - 12.0
1/2
(N-m)
(kgf-m)
108.5 - 130.2
11.07 - 13.29
149.2 - 179.0
15.22 - 18.27
M14
(N-m)
(kgf-m)
136 - 147
13.9 - 15.0
184 - 196
18.7 - 20.0
9/16
(N-m)
(kgf-m)
149.2 - 179.0
15.22 - 18.27
217.0 - 260.4
22.14 - 26.57
M16
(N-m)
(kgf-m)
216 - 225
22.0 - 23.0
286 - 303
29.2 - 31.0
5/8
(N-m)
(kgf-m)
203.4 - 244.1
20.75 - 24.91
298.3 - 358.0
30.44 - 36.53
Thread
Size
d (mm)
Hexa-Bolt
Head size
B (mm)
No mark
7T
N-m
kgf-m
N-m
kgf-m
M8
12 or 13
19.4 - 20.6
(20.0
0.6)
2.0 - 2.1
(2.05
0.05)
25.9 - 27.5
(26.7
0.8)
2.6 - 2.8
(2.7
0.1)
M10
14 or 17
43.2 - 45.1
(44.15
0.95)
4.4 - 4.6
(4.5
0.1)
52.8 - 55.9
(54.35
1.55)
5.4 - 5.7
(5.35
0.15)
M12
17 or 19
69.0 - 72.6
(70.8
1.8)
7.0 - 7.4
(7.2
0.2)
85.2 - 90.2
(87.7
2.5)
8.7 - 9.2
(8.95
0.25)
M14
19 or 22
107.9 - 125.5
(116.7
8.8)
11.0 - 12.8
(11.9
0.9)
135.9 - 147.0
(141.45
5.55)
13.9 - 15.0
(14.45
0.55)
