Screw­connection Classes, Tightening Torques And Initial­tensioning Forces; Screw­connection Classes; Tightening Torques And Initial­tensioning Forces - Siemens FLENDER B3 E Series Assembly And Operating Instructions Manual

The gear unit must be protected against falling objects.
Protective devices for rotating parts must be checked for correct seating. Contact with rotating parts
is not permitted.
A potential equalisation in accordance with the applying regulations and directives must be carried out!
If no threaded holes for earth connection are available on the gear unit, other appropriate measures
must be taken. This work must always be done by specialist electricians.
Cable entries should be protected against moisture.
Check that protective measures have been taken!
6.24 Screw­connection classes, tightening torques and initial­tensioning forces
6.24.1 Screw­connection classes
The specified screw connections are to be fastened applying the tightening torques specified in the table
below.
Table 16: Screw­connection classes
Fastening of
Gear unit
Motor*
Brake*
Torque arm
Inspection hole cover
Protective cover
Canopy
*) The tightening torques applying to these add­on parts can be found in the instructions supplied by the
manufacturers of the parts.
6.24.2 Tightening torques and initial­tensioning forces
The tightening torques apply to friction coefficients of µ
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 17: 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 class of the
diameter
d
mm
M10
Screw­connection
class
C
D
E
= 0.14 applies here to lightly oiled steel bolts, black­annealed or phosphatised
total
Initial­tensioning force
for screw­connection classes
bolt from table 16
C
8.8 18000
10.9 26400
12.9 30900
BA 5033 EN 03/2011
Tightening procedure
Hydraulic tightening with mechanical screwdriver.
­ Torque­controlled tightening with torque wrench,
signal­emitting torque wrench.
­ Tightening with precision mechanical screwdriver
with dynamic torque measuring.
Torque­controlled 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
D E
F
M min.
N
11500 7200
16900 10600
19800 12400
71 / 96
= 0.14. The friction
total
Tightening torque
for screw­connection classes
from table 16
C D
M
A
Nm
44.6 38.4
65.4 56.4
76.5 66.0
E
34.3
50.4
58.9