8
DRIVING TORQUE OF SCREWS, NUTS AND CONNECTORS
Before the disassembly of the various parts
and of the bolts and screws, read carefully
the instructions below.
To tighten the screws use the product LOCTITE 270 in
order to ensure the safety of the threaded couplings.
If it is not possible to loosen the screws because this
product is used, do not add extensions to the tools, but
heat the area (maximum 50°C) in oder to eliminate the
effect of LOCTITE 270.
In the above-mentioned cases use a small quantity of
LOCTITE 270 in the assembly phase (30% of the con-
nection surface).
The driving torque with which the threaded couplings
are tightened is very important to ensure the safety of
the truck connection.
The bolts and nuts and the corresponding driving torques
are shown in the tables on this page.
Nominal
diameter
DRIVING TORQUE Nm
Class 8
Class 10
M 3
4
5.2
M 4
7
9.15
M 5
12.14
14.8
M 6
17.2
20.9
M 8
31.8
38.1
M 10
50.5
60.3
M 12
74.2
88.5
M 14
101.2
120.8
M 16
138,2
164.9
M 18
176.6
203.5
M 20
225.4
259.7
M 22
278.8
321.2
M 24
324.8
374.2
M 27
422.3
486.5
M 30
516.1
594.7
Preloading
N
DRIVING TORQUE Nm
Class 5.8
Class 8.8
Class 10.9
M 4
0.7
7
3
2400
1.92
1.44
3.07
2.3
4.17
3.13
M 5
0.8
8
4
3880
3.88
2.91
6.2
4.65
8.43
6.33
M 6
1
10
5
5490
6.58
4.94
10.5
7.9
14.3
10.8
M 8
1.25
13
6
9990
16
12
25.6
19.2
34.8
26.1
M 8
1
13
6
10700
17.1
12.8
27.4
20.5
37.3
27.9
M 10
1.5
16
8
15825
31.7
23.8
51
38
69
52
M 10
1.25
16
8
16700
33.4
25.1
53
40.1
73
55
M 12
1.75
18
10
23025
55
41.4
88
66
120
90
M 12
1.25
18
10
25150
60
45.3
96
72
130
98
M 14
2
21
12
31400
88
66
140
105
190
145
M 14
1.5
21
12
34125
96
72
155
115
210
155
M 16
2
24
14
42850
135
105
220
165
300
225
M 16
1.5
24
14
45600
145
110
235
175
320
240
M 20
2.5
30
17
66875
270
200
430
320
580
435
M 20
1.5
30
17
74250
295
225
475
355
650
485
= with lubricant
SERVICE
PREFACE
