Tightening Torques For Steel Screws And Nuts/Bolts - ABB UniSec Manual

A. Tightening torques for steel screws and
nuts/bolts
Nuts and bolts
Type
M4
M5
M6
M8
M10
M12
M16
Cheese-head socket screws
Type
M4
M5
M6
M8
M10
M12
M16
Socket-head screws and round-headed Torx
Type
M4
M5
M6
M8
M10
M12
Max. tightening torque [Nm]
Steel class 8.8
3
5
9
22
45
75
185
Max. tightening torque [Nm]
Steel class 8.8
2
4
8
12
35
50
110
Max. tightening torque [Nm]
Steel class 8.8 Steel class 10.9
2 2
4 4
8 8
12 12
30
60
Hexagonal-head bolts with flange
Type
M5
M6
M8
M10
M12
M16
Cheese-head Torx Fastite screw
Type
M6
The values in the tables must be used unless the torque is
specified in the table of joint types.
Max. tightening torque [Nm]
Steel class 90
9
16
34
58
97
215
Max. tightening torque [Nm]
Steel class 8.8
20
39