19
4.4.2 General tightening torques on the application side
Tightening torques for the application-side mounting bolts [Nm]
Strength class
Mounting bolts
M3 M4 M5 M6 M8 M10 M12 M16
10.9
1.6 3.8 7.5 12.9 31 61 105 257
12.9 1.9 4.4 8.7 15.1 36 72 123 300
General conditions for establishing the tightening torques
• Design of bolted connection in accordance with VDI 2230
• The total coefficient of friction for thread and head support is µ
total
=0.1
• Up to 90% of the bolt yield strength is used
• The max. permissible tightening torque minus the accuracy class of the
mounting tool (the accuracy class of the mounting tool must satisfy
DIN EN ISO 6789-1 Type II A at a minimum)
4.4.3 Modified gearboxes: Strength class of the application-side mounting bolts and use
of washers
Table 4.4.3 shows the strength class of the application-side mounting bolts to be
used for modified gearboxes, as well as the use of washers, for application-side
attachment on steel or aluminum. For painted gearboxes, we recommend the use of
washers to protect the paint layer.
Material
Gearbox side
Aluminum Aluminum Aluminum
Steel Steel Steel
Design
Gearbox side
Thread Holes
Oblong
holes
Thread Holes
Oblong
holes
Application
side
of steel
Strength class
Mounting bolts
10.9 12.9 12.9 12.9 12.9 12.9
Washer
required
no yes yes no no yes
Application
side
of aluminum
Strength class
Mounting bolts
10.9 10.9 10.9 12.9 10.9 10.9
Washer
required
yes yes yes yes no yes
Operating Manual Gearbox
Mounting
To Next Page
Loading...