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WEG M line Series - Screw Tightening Torques

WEG M line Series
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11371757 Installation, operation and maintenance manual – Squirrel cage motor – M line – Vertical l 49
8.5 TIGHTENING TORQUE
The Table 8.1 and Table 8.2 shows the tightening torques
of the screws recommended for assembling the motor.
Table 8.1: Screw tightening torque for metal/metal parts
Material /
Resistance
class
Carbon Steel /
8.8 or above
Stainless steel /
A2 – 70 or above
% Yield
Strength
60%
70%
Lubricant Dry
Mol
ycote
1000
Dry
Molycote
1000
Diam
Pitch
(mm)
Screws tightening torque (Nm)
M3
0,5
1,2
0,8
1
0,69
M4
0,7
2,7
1,8
2,4
1,6
M5
0,8
5,4
3,6
4,8
3,2
M6
1
9,3
6,3
8,2
5,5
M8
1,25
22,4
15
20
13
M10
1,5
44
30
39
26
M12
1,75
77
52
67
45
M14
2
123
82
107
72
M16
2
188
126
165
110
M18
2,5
263
176
230
154
M20
2,5
368
246
322
215
M22
2,5
500
332
437
290
M24
3
637
425
557
372
M27
3
926
615
810
538
M30
3,5
1260
838
1102
734
M33
3,5
1704
1130
1490
990
M36
4
2195
1459
1920
1277
M42
4,5
3507
2328
3070
2037
M48
5
5258
3488
4600
3052
Table 8.2: Screw tightening torque for metal/isolated parts
Material /
Resistance
class
Carbon Steel /
8.8 or above
Stainless steel /
A2 – 70 or above
% Yield
Strength
33%
33%
Lubricant Dry
Molycote
1000
Dry
Molycote
1000
Diam
Pitch
(mm)
Screws tightening torque (Nm)
M3
0,5
0,6
0,5
0,48
0,32
M4
0,7
1,5
1
1,1
0,76
M5
0,8
3
2
2,2
1,5
M6
1
5,2
3,4
3,8
2,6
M8
1,25
12,3
8,3
9,2
6,2
M10
1,5
24
16
18,2
12,2
M12
1,75
42
28
32
21
M14
2
68
45
51
34
M16
2
104
69
78
52
M18
2,5
145
98
108
72
M20
2,5
202
135
152
101
M22
2,5
274
183
206
137
M24
3
350
233
263
175
M27
3
510
338
382
254
M30
3,5
693
461
520
346
M33
3,5
937
622
703
466
M36
4
1207
802
905
602
M42
4,5
1929
1280
1447
960
M48
5
2892
1918
2170
1440
NOTE
The resistance class is normally indicated
on
the head of the hex bolts.

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