General Tightening Torques On The Application Side; Mounting Bolts; Modified Gearboxes: Strength Class Of The Application-Side Mounting Bolts And - NEUGART PLE Operating Manual

Operating Manual Gearbox
Mounting

4.4.2 General tightening torques on the application side

Strength class

Mounting bolts

10.9
12.9
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
• 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
Design
Gearbox side
Strength class
Application
Mounting bolts
side
Washer
of steel
required
Strength class
Application
Mounting bolts
side
Washer
of aluminum
required
Tightening torques for the application-side mounting bolts [Nm]
M3 M4 M5
1.6 3.8 7.5
1.9 4.4 8.7
Aluminum Aluminum
Thread
10.9
no
10.9
yes
19
M6 M8
12.9 31
15.1 36
Aluminum
Oblong
Holes Thread
holes
12.9 12.9
yes yes
10.9 10.9
yes yes
M10 M12
61 105
72 123
=0.1
total
Steel Steel Steel
Oblong
Holes
holes
12.9 12.9
no no
12.9 10.9
yes no
M16
257
300
12.9
yes
10.9
yes