7 Reference information
7.4. Screw joints
3HAC020993-001 Revision:G
386
©
Co
py
rig
h
t 200
4-
200
8 ABB. All righ
ts reser
v
ed.
The table below specifies the recommended standard tightening torque for
oil-lubricated
screws
with
Allen head screws.
The table below specifies the recommended standard tightening torque for
Molycote-
lubricated screws
with
Allen head screws.
The table below specifies the recommended standard tightening torque for
water and air
connectors
when
one
or
both
connectors are made of
brass
.
Dimension
Tightening torque
(Nm)
Class 8.8, oil-lubri-
cated
Tightening torque
(Nm)
Class 10.9, oil-lubri-
cated
Tightening torque
(Nm)
Class 12.9, oil-lubri-
cated
M5
6
-
-
M6
10
-
-
M8
24
34
40
M10
47
67
80
M12
82
115
140
M16
200
290
340
M24
725
960
1150
Dimension
Tightening torque (Nm)
Class 10.9, Molycote-lubricated
Tightening torque (Nm)
Class 12.9, Molycote-lubricated
M8
28
34
M10
55
66
M12
96
115
M16
235
280
M24
790
950
Dimension
Tightening torque
Nm - Nominal
Tightening torque
Nm - Min.
Tightening torque
Nm - Max.
1/8
12
8
15
1/4
15
10
20
3/8
20
15
25
1/2
40
30
50
3/4
70
55
90
Continued