Operating and maintenance instructions
Installing the motor
Version 1.0
Page 17 of 56
4 Installing the motor
4.1 Tightening torques for fastening elements
Danger of property damage
For attachments, use the tightening torques specified by the manufacturer
If no tightening torques are specified by the manufacturer, refer to the drawing
or the table below for tightening torques
The tightening torques indicated on the drawing have priority
Thread
Production class according to DIN 267
Width
across
flats
4.8
8.8
10.9
12.9
Tightening torques [Nm]
M 3
0.6
1.4
1.9
2.2
5.5
M 4
1.3-1.5
3-3.6
4.3-5.3
5.1-6.1
7
M 5
2.6-3.1
6-7.1
8.5-10
10.2-12
8
M 6
4.5-5.2
10.3-12
14.7-18
17.6-21
10
M 8
10.8-12.5
25.5-30
35.3-44
42.2-52
13
M 10
21.6-25.8
50-60
70.6-87
85.3-100
15
M 12
38.2-45
87.3-105
122-151
147-177
18
M 16
90-100
200-220
290-320
345-380
24
These tightening torques are standard values for metric standard threads according to
DIN 13 and head support dimensions according to DIN 912; 931; 934; 6912; 7994 and
79xx. They result in a 90% utilisation of the bolt yield strength. A coefficient of friction
of 0.14 to 0.20 was assumed (new screw, without post-treatment, unlubricated).
NOTICE
