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For proper screw tightening, use an adequate torque wrench and the values listed in the tables below:
Thread
M6
M8
M10
M12
M14
M16
These are guiding values, and are based on average conditions of steel-to-steel friction.
Thread
1/4
5/16
3/8
1/2
9/16
5/8
These are guiding values, and are based on average conditions of steel-to-steel friction.
Torque Specifications
Screw torques - metric - coarse thread - UNC
Screw torques - inches
Coarse thread - UNC
Grade 5
N.m
Ibf.ft
N.m
12.1
8.9
17.0
23.9
17.6
33.9
41.5
30.6
58.4
101.0
74.4
141.0
143.0
105.4
201.0
199.0
146.7
280.0
Resistance class - 8.8
N.m
10.6
25.6
51.2
88.0
138.0
210.0
Resistance class
Grade 8
Grade 5
Ibf.ft
N.m
12.5
13.5
25.0
25.9
43.0
45.7
104.0
110.0
154.8
155.0
206.5
219.0
Ibf.ft
7.8
18.8
37.7
64.9
101.7
154.8
Fine thread - UNF
Grade 8
Ibf.ft
N.m
Ibf.ft
9.9
18.9
13.9
19.1
36.6
26.9
33.7
64.2
47.3
81.1
155.0
114.3
114.3
219.0
161.5
161.5
308.0
227.1
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