2
4. Tightening Torque of General Bolts and Nuts (For Reference)
Table 5
Strength
Class of
Bolt
Nominal Diameter of Bolt mm
6
8
10
12
14
16
18
20
Tightening Torque N.m
5.6
5~7
12~15
25~31
44~54
69~88
108~137
147~186
206~265
6.6
6~8
14~18
29~39
49~64
83~98
127~157
176~216
245~314
8.8
9~12
22~29
44~58
76~102
121~162
189~252
260~347
369~492
10.9
13~14
29~35
64~76
108~127
176~206
274~323
372~441
529~637
12.9
15~20
37~50
74~88
128~171
204~273
319~425
489~565
622~830
