Screw Fastenings
 CAUTION |
|---|
|
HAZARD OF INAPPROPRIATE ASSEMBLY
Comply with the specified torque values for the installations
that are covered in this guide.
Failure to follow these instructions can result in injury or equipment damage.
|
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 |