Service and maintenance
8.4 Checking tightness of fastening bolts
BA 2012
40
Operating Instructions, 03/2013, 70000004024300
8.4
Checking tightness of fastening bolts
ATEX version gearboxes
Loose parts can cause sparks through impact.
Entry of foreign bodies can cause sparks.
Note
Replace damaged headless screws with new screws of the same type and strength class.
Switch off the power to the drive unit and use a torque wrench to check the seating of all
fastening bolts.
The general tolerance for the tightening torque in Nm is 10 %. The friction coefficient is
0.14 μ.
Table 8- 3
Tightening torques for fastening bolts
Tightening torque at strength class
8.8
10.9
12.9
Thread size
[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
Summary of Contents for Worm Gearbox S 5 BA 2012
Page 1: ...Answers for industry MOTOX MOTOX Worm Gearbox S BA 2012 Operating Instructions 03 2013 ...
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Page 34: ...Commissioning BA 2012 32 Operating Instructions 03 2013 70000004024300 ...
Page 36: ...Operation BA 2012 34 Operating Instructions 03 2013 70000004024300 ...
Page 44: ...Disposal BA 2012 42 Operating Instructions 03 2013 70000004024300 ...
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