Screw Fastenings
 CAUTION |
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HAZARD OF INAPPROPRIATE ASSEMBLY
During the assembly, always use the tightening torque
values mentioned in the table below.
Failure to follow these instructions can result in injury or equipment damage.
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The following elements should be used for all screw fastenings:
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Screws and bolts: Grade ≥ 8.8
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Nuts: Grade 8
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Hex, bolts,
socket-head cap screws (except slotted screws), and nuts (except |
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Thread size |
Tightening torque (N•m) |
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Min. |
Max. |
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M5 |
3.8 |
4.7 |
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M6 |
7 |
9 |
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M8 |
16 |
24 |
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M10 |
36 |
44 |
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M12 |
63 |
77 |
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Screw fastening with casting nuts in cast resin parts (transformer and post insulator) |
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Thread size |
Tightening torque (N•m) |
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Min. |
Max. |
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M6 |
5 |
7.5 |
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M8 |
12 |
18 |
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M10 |
24 |
38 |
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M12 |
63 |
54 |
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Screw fastening for current transmission conductor material is copper |
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Thread size |
Tightening torque (N•m) |
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Min. |
Max. |
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M6 |
5.5 |
7.5 |
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M8 |
12 |
19 |
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M10 |
30 |
40 |
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M12 |
60 |
76 |