14
Tightening torque for bolts
5.
Classification of bolt
Material of bolt
8T
4T
Stainless
Brass
BsBM2S-0
SUS304
SS400
SCM435
(S55C)
Nominal
of bolt
(mm)
Pitch *
1
(mm)
Tightening torque *
2
Unit : N m{kgf m}
M 3
0.5
0.6
{0.06}
1.3
{0.14}
0.4
{0.04}
0.5
{0.05}
M 4
0.7
1.4
{0.14}
3.2
{0.33}
1.0
{0.10}
1.0
{0.11}
M 5
0.8
2.7
{0.28}
6.4
{0.66}
1.8
{0.19}
2.0
{0.21}
M 6
1.0
4.7
{0.48}
10
{1.1}
3.1
{0.32}
3.6
{0.37}
M 8
1.25
11
{1.1}
26
{2.7}
7.8
{0.80}
9.0
{0.92}
M 10
1.25
22
{2.3}
15
{1.6}
18
{1.9}
M 12
1.25
39
{4.0}
55
{5.7}
29
{3.0}
33
{3.4}
(M 14)
1.5
62
{6.3}
98
{10}
47
{4.8}
53
{5.4}
M 16
1.5
97
{9.9}
150
{16}
73
{7.5}
81
{8.3}
M 20
1.5
180
{19}
240
{25}
140
{15}
150
{16}
(M 22)
1.5
250
{26}
500
{51}
670
{69}
200
{21}
220
{23}
M 24
2.0
320
{33}
840
{86}
250
{26}
280
{29}
M 30
2.0
640
{66}
1600
{170}
530
{54}
570
{58}
*1. In the table above, the thread pitches of bolt diameters M3 to M8 are for coarse
screw threads and those of bolt diameters M10 or larger are for fine threads
according to our specifications.
*2. The tolerance range of tightening torque is to be +/- 10% of the reference values
given above. (The tolerance range is determined according to experience, related
standards, and records provided by other companies.)
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