SERVICE
8
INTRODUCTION
TORQUE SETTINGS FOR SCREWS, NUTS AND FITTINGS
Before disassembling the various parts
and nuts and bolts, read the following
carefully.
To make the threaded matings secure,
LOCTITE 270
is
used for tightening the screws.
If it is not possible to unscrew the bolts because this
product has been used, avoid applying extensions to
the tools, instead slightly heat the area (at most 50°C)
so as to eliminate the
LOCTITE 270
effect.
In the cases described, reapply
LOCTITE 270
during
installation in a moderate quantity (30% of the mating
surface).
The torque setting used for tightening the threaded
couplings is extremely important to make the coupling
secure and the machine safe.
The tables on this page give the classes of bolts normally
used with the relevant torque settings.
Nominal
diameter
TORQUE SETTING Nm
Class 8
Class 10
M3
4
5.2
M4
7
9.15
M5
12.14
14.8
M6
17.2
20.9
M8
31.8
38.1
M10
50.5
60.3
M12
74.2
88.5
M14
101.2
120.8
M16
138.2
164.9
M18
176.6
203.5
M20
225.4
259.7
M22
278.8
321.2
M24
324.8
374.2
M27
422.3
486.5
M30
516.1
594.7
Pre-load N
TORQUE SETTING Nm
Class 5.8
Class 8.8
Class 10.9
M4
0.7
7
3
2400
1.92
1.44
3.07
2.3
4.17
3.13
M5
0.8
8
4
3880
3.88
2.91
6.2
4.65
8.43
6.33
M6
1
10
5
5490
6.58
4.94
10.5
7.9
14.3
10.8
M8
1.25
13
6
9990
16
12
25.6
19.2
34.8
26.1
M8
1
13
6
10700
17.1
12.8
27.4
20.5
37.3
27.9
M10
1.5
16
8
15825
31.7
23.8
51
38
69
52
M10
1.25
16
8
16700
33.4
25.1
53
40.1
73
55
M12
1.75
18
10
23025
55
41.4
88
66
120
90
M12
1.25
18
10
25150
60
45.3
96
72
130
98
M14
2
21
12
31400
88
66
140
105
190
145
M14
1.5
21
12
34125
96
72
155
115
210
155
M16
2
24
14
42850
135
105
220
165
300
225
M16
1.5
24
14
45600
145
110
235
175
320
240
M20
2.5
30
17
66875
270
200
430
320
580
435
M20
1.5
30
17
74250
295
225
475
355
650
485
= with lubricant
