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Maintenance
9.5 Repair
Screw type
M8
M10
M12
M16
Examples of soft materials are Cu, Al, CuZn cable entries, laminate materials, plastics, cast
1
resin post insulators, press nuts, welding nuts, blind rivet nuts, and cage nuts.
Hard materials S2 are materials with friction-enhancing washer components, e.g. a contact
2
washer.
Hard S1 materials include steel, for example.
3
Table 9-2
Screw type
M2
M2.5
M3
M3.5
M4
M5
M6
M8
M10
M12
M16
Observe the tightening torques of the terminal manufacturer and the test torques according to
DIN EN 60999-1, VDE 609-1
144
Soft materials S3
1
nm
in - lb
13.0
115
25.0
221
50.0
443
115.0
1020
Tightening torques for screw terminals for copper cables without cable lug
Set screws and
headless screws
nm
in - lb
-
0.25
2.2
0.3
2.7
0.5
4.4
0.8
7.1
1.0
8.6
1.3
11.5
1.8
15.9
-
-
-
-
-
-
Hard materials S2
2
nm
in - lb
32.0
283
65.0
575
115.0
1020
270.0
2390
Head screws with
slit
nm
in - lb
-
0.5
4.4
0.6
5.3
1.0
8.9
1.3
11.5
2.5
22.1
3.0
26.6
3.9
34.5
4.8
42.5
-
-
-
-
SINAMICS SM150 6SL3845-2NN41-8AD2
Operating Instructions Rev.201910281310 EXAMPLE
Hard materials S1
3
nm
in - lb
25.0
221
50.0
443
88.0
779
215.0
1900
1)
Head screws with
hexagon profile
nm
in - lb
-
0.5
4.4
0.6
5.3
1.0
8.9
1.3
11.5
2.5
22.1
3.5
31.0
7.2
63.7
13
115
18
159.3
30
265.5
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