Operating Instructions
42
1096.0799 | VU / VH Series
10/2010
9.2.10 Tightening
torques
9.2.10.1 For screws and nuts
►
Tighten the screws by means of a torque wrench.
The following values apply to new screws and nuts.
Size
Property class
Tightening torque
[Nm]
M 5
8.8
5.7
M 6
8.8
9.9
M 8
8.8
25
M 10
8.8
51
M 12
8.8
89
M 16
8.8
215
M 20
8.8
420
Tab. 27 Tightening torques for screws and nuts
9.2.10.2 For screws in cast-iron casings
The following values apply to new screw plugs (Steel,
brass) in cast-iron casings (EN-GJL-250, CuZn).
Size
Property class
Tightening torque
[Nm]
M 5
8.8
4.0
M 6
8.8
8.5
M 8
8.8
12
M 10
8.8
25
M 12
8.8
40
M 16
8.8
90
Tab. 28 Tightening torques for screws in cast-iron casings
9.2.10.3 For stainless steel screws in stainless steel
casings
►
Tighten the screws by means of a torque wrench.
The following values apply to new stainless steel screws.
Size
Property class
Tightening torque
[Nm]
M 5
A2/A4
4.2
M6 A2/A4 7.3
M 8
A2/A4
17.5
M 10
A2/A4
35
M 12
A2/A4
60
M 16
A2/A4
144
M 20
A2/A4
281
Tab. 29 Tightening torques for stainless steel screws in
stainless steel casings
9.2.10.4 For screw plugs
►
Tighten the screws by means of a torque wrench.
The following values apply to new screw plugs (St, Ms) in
cast-iron casings (EN-GJL-250, CuZn).
Size
Tightening torque [Nm]
G 1/8 A
9
G 1/4 A
20
G 3/8 A
40
G 1/2A
53
G 3/4 A
93
G 1 A
133
Tab. 30 Tightening torques for screw plugs in cast-iron casings
►
Tighten the screws by means of a torque wrench.
The following values apply to new stainless steel screw
plugs
Size
Tightening torque [Nm]
G 1/8 A
12
G 1/4 A
23
G 3/8 A
46
G 1/2A
60
G 3/4 A
120
G 1 A
200
Tab. 31 Tightening torques for stainless steel screw plugs
9.2.10.5 Tightening torques for cylindrical pipe nipples
The following values apply to new pipe nipples in cast-iron
casings (EN-GJL-250, CuZn).
Size
Tightening torque [Nm]
G 1/8 A
12
G 1/4 A
23
G 3/8 A
46
G 1/2 A
60
G 3/4 A
120
G 1 A
206
G 1 1/2 A
380
G 2
535
Tab. 32 Tightening torques for pipe nipples
