Installation
4.3 Thread sizes and tightening torques for fastening bolts
BA 2030
Operating Instructions, 02/2021, A5E37880173A/RS-AM
31
On geared motors with a fan, leave sufficient free space for the entry of air. Observe the
installation conditions for the geared motor.
Provide sufficient lifting gear at the start of mounting and fitting work.
Observe the mounting position specified on the rating plate. This ensures that the correct
quantity of lubricant is provided.
Use all the fastening means that have been assigned to the particular mounting position and
mounting type.
Cap bolts cannot be used in some cases due to a lack of space. In such cases, please contact
Technical Support quoting the type of gearbox.
4.3
Thread sizes and tightening torques for fastening bolts
The general tolerance for the tightening torque is 10%. The tightening torque is based on a
friction coefficient of
μ
= 0.14.
Table 4- 1
Tightening torques for fixing screws
Thread size
Tightening torque for property class
8.8
10.9
12.9
Nm
Nm
Nm
M4
3
4
5
M5
6
9
10
M6
10
15
18
M8
25
35
41
M10
50
70
85
M12
90
120
145
M16
210
295
355
M20
450
580
690
M24
750
1 000
1 200
M30
1 500
2 000
2 400
M36
2 500
3 600
4 200
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