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General tightening
8.1
torques
Steel
8.1.1
Version: 2.1
Do not use compressed air and do not spray inside the gear
unit
Use a cloth for cleaning. Spray only the cloth with cleaning agent
and carefully clean the clamping hub.
Compressed air can damage the seals of the gear unit and clean-
ing agent directly sprayed inside can affect the coefficient of friction
of the clamping hub.
Leaks on gear units with grease lubrication
Seal the surfaces of the adapter plates, the drive housing and the
motor with a surface sealing adhesive.
Leaks may occur on the drive with gear units with grease lubrica-
tion. This so-called sweating can negatively affect the lifecycle of
the gear unit.
8.1
The specified tightening torques for nuts and bolts are mathematical
values based on the following requirements:
• Calculation according to VDI 2230 (February 2003 edition)
• Friction coefficient for threads and contact surfaces µ = 0.10
• Elastic limit utilization 90%
• Torque tools type II classes A and D according to ISO 6789
The setting values are rounded to conventional scalings or adjust-
ment possibilities:
Screw size
8.8
M3
1.15
M4
2.64
M5
5.2
M6
M8
21.5
M10
42.5
M12
73.5
M14
118
M16
180
M18
258
M20
362
M22
495
M24
625
AG2400
Mechanical installation
Quality of the screws
10.9
Tightening torque in Nm
1.68
3.88
7.6
9
13.2
32
62.5
108
173
264
368
520
700
890
12.9
1.97
4.55
9
15.4
37.5
73.5
126
202
310
430
605
820
1040
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73
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