6.2
Torques
Tighten all screw connections, for which no tightening torque or no pretension force is
specified in drawings or Assembly Instructions, according to VDI 2230.
Exceptions to this rule are all connections with screws that are not screw connections in
the real sense. This includes hose clips, cable glands, screw fittings, gas connections,
screws for circuit boards etc. Tighten these screw fittings as evenly as possible with a
much lower torque (hose clips 1 Nm, other screw fittings according to manufacturer
specifications).
Select the next lowest torque valid for the screw for mixed materials and special screws
such as relieved screws.
The friction coefficient serving as basis is (screw fitting without lubrication)
µk=µG=0.14. The calculated values are valid for room temperature (T=20°C).
Table 13: Torques
Dimension
Slope P
Tightening torque M
A
(Nm) according to strength class (see screw
head)
3.6
4.6
A2-50
A4-50
5.6
Alu
A2-70
A4-70
A2-80
A4-80
8.8
Titan
10.9
12.9
M 1.6
0.4
0.05
0.05
0.05
0.11
0.16
0.19
0.26
0.31
M 2
0.45
0.1
0.1
0.11
0.22
0.32
0.39
0.55
0.66
M 2.5
0.45
0.21
0.22
0.23
0.46
0.67
0.81
1.13
1.36
M 3
0.5
0.54
1
1.2
1.39
1.51
1.98
2.37
M 3.5
0.6
0.85
1.3
1.54
1.75
1.9
2.6
3.2
M 4
0.7
1.02
2
2.5
3
3.3
4.8
5.6
M 5
0.8
2
2.7
4.2
5.6
6.5
9.5
11.2
M 6
1
3.5
4.6
7.3
9.7
11.3
16.5
19.3
M 8
1.25
8.4
11
17.5
23.3
27.3
40.1
46.9
M 10
1.5
17
22
35
47
54
79
93
M 12
1.75
29
39
60
79
93
137
160
M14
2
46
62
94
126
148
218
255
M 16
2
71
95
144
192
230
338
395
M 18
2.5
97
130
199
266
329
469
549
M 20
2.5
138
184
281
374
464
661
773
M 22
2.5
186
250
376
508
634
904
1057
M 24
3
235
315
485
645
798
1136
1329
M 27
3
350
470
708
947
1176
1674
1959
M 30
3.5
475
635
969
1289
1597
2274
2662
M 33
3.5
645
865
1319
1746
2161
3078
3601
M 36
4
1080
1440
1908
2350
2778
3957
4631
M 39
4
1330
1780
2416
3016
3597
5123
5994
6
TECHNICAL DATA
20
A D D E N D U M T O O P E R A T I N G I N S T R U C T I O N S | MARSIC300
8026470/AE00/V1-0/2021-04 | SICK
Subject to change without notice
