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GENERAL
TIGHTENING TORQUES OF STANDARD BOLTS & NUTS
Wherever the tightening torques are not specified use the following values for these fastners.
Grade
Bolt or Nut Size
Pitch (mm)
Tightening N-m
Torque kg-m
M6
1.0
8.5 - 10
0.85 - 1.0
M8
1.25
21 - 25
2.1 - 2.5
M10
1.5
41 - 51
4.1 - 5.1
1.0
46 - 56
4.6 - 5.6
M12
1.75
72 - 88
7.2 - 8.8
1.5
75 - 91
7.5 - 9.1
M14
2.0
113 - 138
11.3 - 13.8
1.5
126 -154
12.6 - 15.4
M16
2.0
176 - 215
17.6 - 21.5
1.5
189 - 231
18.9 - 23.1
M6
1.0
12 - 14
1.2 - 1.4
M8
1.25
29 - 35
2.9 - 3.5
1.0
32 - 39
3.2 - 3.9
M10
1.5
58 - 70
5.8 - 7.0
1.0
64 - 78
6.4 - 7.8
M12
1.75
99 - 121
9.9 - 12.1
1.5
104 - 127
10.4 - 12.7
M14
2.0
162 - 198
16.2 - 19.8
1.5
176 - 215
17.6 - 21.5
M16
2.0
248 - 303
24.8 - 30.3
1.5
266 - 325
26.6 - 32.5
Bolt 8.8
Nut 8.0
Bolt 10.9
Nut 10.0
1. This standard is applicable to the bolts having the following marks embossed on the bolt head and punch mark
on the nut head.
Grade
8.8
For the Bolt
10.9 For the Bolt
8
For the Nut
10
For the Nut
Note : Always use the calibrated torque wrenches.
2. Nyloc nuts and copper washer should not be re-used