28
8018429/1DWP/V3-0/2022-06| SICK
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 | GMS840
Subject to change without notice
8
TECHNICAL DATA
8.1.2
Torques
All screw connections for which no tightening torque or preload force is stated in drawings
or mounting instructions are to be tightened according to VDI 2230.
All connections with screws which are not classic screw connections are excluded from this
rule. This means strap retainers, cable glands, screw fittings, gas connections, screws for
circuit boards etc. Here, the screw fittings have to be tightened as evenly as possible with a
significantly lower tightening torque (strap retainers 1 Nm, other screw fittings according to
manufacturer specification).
Select the next lower valid tightening torque for the screw for mixed materials and special
screws as well as relieved screws.
The basic friction coefficient is (screw fittings without lubrication)
μ
k=
μ
G=0.14. The
calculated values are valid for room temperature (T=20°C).
Dimension
Pitch P
Tightening torque Ma (Nm)
3.6
4.6
5.6
8.8, A2
a. A4-
80
10.9
12.9
M 1.6
0.4
0.05
0.05
0.17
0.28
M 2
0.45
0.1
0.11
0.35
0.6
M 2.5
0.45
0.21
0.23
0.73
1.23
M 3
0.5
0.54
1
1.3
1.7
2
M 3.5
0.6
0.85
1.3
1.9
2.6
3.2
M 4
0.7
1.02
2
2.5
4.4
5.1
M 5
0.8
2
2.7
5
8.7
10
M 6
1
3.5
4.6
10
15
18
M 8
1.25
8.4
11
25
36
43
M 10
1.5
17
22
49
72
84
M 12
1.75
29
39
85
125
145
M14
2
46
62
135
200
235
M 16
2
71
95
210
310
365
M 18
2.5
97
130
300
430
500
M 20
2.5
138
184
425
610
710
M 22
2.5
186
250
580
830
970
M 24
3
235
315
730
1050
1220
M 27
3
350
470
1100
1550
1800
M 30
3.5
475
635
1450
2100
2450
M 33
3.5
645
865
2000
2800
3400
M 36
4
1080
1440
2600
3700
4300
M 39
4
1330
1780
3400
4800
5600
