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