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Technical data
B.2 Tightening torques
Tightening torques
The bolted connections with metal contact surfaces, such as end shields, bearing cartridge
parts, terminal box parts bolted onto the stator frame, should be tightened to the following
torques, depending on the thread size:
Table B- 1
Thread
Nm
The tightening torques stated above apply to screws with property class 8.8, A4-70 or A4-80
according to ISO 898-1, however only to bolts screwed into components made from
materials with the same or higher property class, e.g. cast iron, steel or cast steel.
Non-standard tightening torques
Different tightening torques for electrical connections and bolted connections for parts with
flat seals or insulating parts are specified in the relevant sections and drawings.
B.2.2
Terminal board and grounding
Table B- 2
Tightening torques for electrical connections on the terminal board and grounding
Thread ∅
M 3.5
min
0.8
Nm
Max.
1.2
B.2.3
Terminal boxes, end shields, grounding conductors, sheet metal fan covers
If no other tightening torques are specified, then the values in the following table apply.
Table B- 3
Tightening torques for screws on the terminal box, end shields, screw-type grounding conductor connections
Thread ∅
M 3.5
Nm
min
0.8
max
1.2
Table B- 4
Tightening torques for self-tapping screws on the terminal box, end shields, screw-type grounding conductor
connections, sheet metal fan covers
Thread ∅
Nm
120
Tightening torques for bolted connections with a tolerance of ±10 %.
M5
M6
∅
5
8
M 4
M 5
0.8
1.8
1.2
2.5
M 4
M 5
2
3.5
3
5
min
max
M8
M10
M12
20
40
70
M 6
M 8
2.7
5.5
4
8
M 6
M 8
M 10
6
16
28
9
24
42
M 4
4
5
Operating Instructions, 04/2022, A5E51689275A-AA
M16
M20
170
340
M 10
M 12
9
14
13
20
M 12
M 16
46
110
70
165
M 5
M 6
7.5
12.5
9.5
15.5
1LE7 shaft heights 71 ... 315
M24
600
M 16
27
40
M20
225
340
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