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3.3
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 3- 1
Thread size
M4
M5
M6
M8
M10
M12
M16
M20
M24
M30
M36
3.4
Mounting an input or output element on the gearbox shaft
Risk of burns caused by hot parts
Do not touch the gearbox without protection.
NOTICE
Damage to shaft sealing rings caused by solvent
Avoid any contact of solvent or benzine with the shaft sealing rings.
NOTICE
Damage to shaft sealing rings caused by heating
Use thermal shields to protect shaft sealing rings from heating above 100 °C due to radiant
heat.
BA 2039
Operating Instructions, 04/2016, A5E37431501A/RS-AC
Tightening torques for fastening bolts
Tightening torque for strength class
8.8
[Nm]
3
6
10
25
50
90
210
450
750
1 500
2 500
WARNING
3.3 Thread sizes and tightening torques for fastening bolts
10.9
[Nm]
4
9
15
35
70
120
295
580
1 000
2 000
3 600
Installing
12.9
[Nm]
5
10
18
41
85
145
355
690
1 200
2 400
4 200
17
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