Specifications For Startup And Operation; 1Impermissible Operating Conditions; Tightening Torques For Common Thread Sizes In General Mechanical Engineering31 - Wittenstein alpha Advanced SP+ ATEX MF Series Operating Manual

+
SP ATEX MF
10.4

Specifications for startup and operation

Product type
Product type
10.4.1 Impermissible operating conditions
The following operating conditions are not permitted:
- Lateral forces or bending torques acting on the blind hollow shaft / hollow shaft /
hollow shaft interface. If necessary, install external bearing points for the load
shaft. In case of unclear installation situations, contact WITTENSTEIN alpha
GmbH.
- Co-riding the gearbox on the drive axle is prohibited. Exceptions require a written
approval and technical statement from WITTENSTEIN alpha GmbH.
- Use in continuous duty (S1 duty: power-on time greater than 60% or longer than
20 minutes)
10.5 Tightening torques for common thread sizes in general mechanical engineering
The specified tightening torques for set screws and nuts are calculated values and are based on
the following conditions:
- Calculation in accordance with VDI 2230 (February 2003 version)
- Friction value for thread and contact surfaces µ=0.10
- Utilization of the yield stress 90%
- Torque tools type II classes A and D in accordance with ISO 6789
The settings are values rounded to usual commercial scale gradations or setting possibilities.
Use the exact values in this table to set your tools.

Property
class
screw / nut
8.8 / 8
10.9 / 10
12.9 / 12
Revision: 07
Ambient temperature
+
SP
Operating temperature
+
SP
Tbl-19: Ambient temperature / Operating temperature
In the case of mounting position V1, reduce the average drive speed
n by 20%. See Chapter 10.6 "Technical specifications".
1N
Tightening torque [Nm] with thread
M3 M4 M5 M6
1.15 2.64 5.2 9.0 21.5 42.5 73.5 118 180 258 362 495
1.68 3.88 7.6 13.2 32.0 62.5 108 173 264 368 520 700
1.97 4.55 9.0 15.4 37.5 73.5 126 202 310 430 605 820 1040
Tbl-20: Tightening torques for set screws and nuts
2022-D014984
Minimum temperature
[°C]
0
Max. permissible housing temperature [°C]
M8 M10 M12 M14 M16 M18 M20 M22 M24
Maximum temperature
[°C]
+40
+80
Appendix
625
890
en-31