Screw Fastenings
The following elements are required to be used for all screw fastenings:
-
Screws and bolts: Grade ≥ 8.8
-
Nuts: Grade 8
NOTE: Do not grease screws or nuts.
Hex. bolts and socket-head capscrews (except slotted screws) and nuts (except self-locking nuts)
|
Thread size |
Tightening torque [N•m] |
|
|---|---|---|
|
min. |
max. |
|
|
M5 |
3,8 |
4,7 |
|
M6 |
7 |
9 |
|
M8 |
16 |
24 |
|
M10 |
36 |
44 |
|
M12 |
63 |
77 |
Screw fastening with casting nuts in cast resin parts (transformer and post insulator)
|
Thread size |
Tightening torque [N•m] |
|
|---|---|---|
|
min. |
max. |
|
|
M6 |
5 |
7,5 |
|
M8 |
12 |
18 |
|
M10 |
24 |
38 |
|
M12 |
36 |
54 |
Screw fastening for current transmission, conductor material: copper
|
Thread size |
Tightening torque [N•m] |
|
|---|---|---|
|
min. |
max. |
|
|
M6 |
5,5 |
7,5 |
|
M8 |
15 |
19 |
|
M10 |
30 |
40 |
|
M12 |
60 |
76 |
|
M12 |
63 |
77 |