Screw­connection Classes, Tightening Torques And Initial­tensioning Forces; Screw­connection Classes; Tightening Torques And Initial­tensioning Forces - Siemens FLENDER H3LV Assembly And Operating Instructions Manual

6.10 Screw­connection classes, tightening torques and initial­tensioning forces
6.10.1 Screw­connection classes
The specified screw connections are to be fastened applying the tightening torques specified observing
the table below.
NOTICE
Material damage
Risk of damage to the bolts and/or mating threads through incorrect tightening.
Foundation bolts, hub bolts and bearing­cover bolts must always be tightened in accordance with
screw­connection class "C".
Table 7: Screw­connection classes
Fastening of
Gear unit
Motor*
Protective hood
)
* The tightening torques applying to these add­on parts can be found in the instructions supplied by the
manufacturers of the parts.
6.10.2 Tightening torques and initial­tensioning forces
The tightening torques apply to friction coefficients of μ
The friction coefficient μ
and dry, cut mating threads in steel or cast iron. Lubricants which alter the friction coefficient must not be
used and may overload the screw connection.
Table 8: Initial­tensioning forces and tightening torques for screw connections of strength classes
8.8; 10.9; 12.9 with a common friction coefficient of μ
Nominal Strength
thread
diameter of the bolt
d
mm
M10
M12
Screw-connection
class
C
D
E
= 0.14 applies here to lightly oiled steel bolts, black­annealed or phosphatised
total
Initial-tensioning force
class for screw-connection classes
from table 7
C
8.8 18000
10.9 26400
12.9 30900
8.8 26300
10.9 38600
12.9 45100
BA 5080 en 06/2014
Tightening procedure
– Hydraulic tightening with mechanical screwdriver
– Hydraulic tightening with mechanical screwdriver
– Tightening with precision mechanical screwdriver
with dynamic torque measuring
– Torque-controlled tightening with mechanical screwdriver
– Tightening with pulse screwdriver or impact wrench
without adjustment checking device
– Tightening by hand, using a spanner without torque
measuring device
= 0.14.
total
total
D E
F
M min.
N
11500 7200
16900 10600
19800 12400
16800 10500
24700 15400
28900 18100
46 / 72
= 0.14
Tightening torque
for screw-connection classes
from table 7
C D
M
A
Nm
44.6 38.4
65.4 56.4
76.5 66.0
76.7 66.1
113 97.1
132 114
E
34.3
50.4
58.9
59.0
86.6
101